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Posted to users@httpd.apache.org by Peter N Lewis <pe...@stairways.com.au> on 2009/11/20 06:36:53 UTC
[users@httpd] Memory / Process leak
I am having a serious problem with my site running out of memory. apache is leaking memory/processes.
I have half a dozen virtual hosts, but relatively light traffic, around 40,000 accesses per day (that includes all files on all hosts), so on the order of 1 access per second average.
Currently my 512MB slicehost slice (1GB swap) starts off at about 100MB used, and then grows over a few days to fill RAM and start using swap, at which point I restart apache and the process repeats.
However I have a release coming up, and that will increase the traffic substantially for a short period of time, and its imperative that the site doesn't go down.
Most of my pages are plain pages, but some of them are mod_perl perl pages.
I disabled most modules, remaining are only: authz_host dir headers mime negotiation rewrite status env perl
More server stats are below if they are useful.
The problem appears to be that the worker processes get caught in a read and never finish and never die.
root 19962 0.0 8.3 193708 43948 ? Ss Nov19 0:21 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 21837 0.1 13.6 527656 71404 ? Sl 03:12 0:08 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 21995 0.0 13.9 904004 73204 ? Sl 04:49 0:01 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 22023 0.0 14.0 773972 73880 ? Sl 04:50 0:01 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 22046 0.0 14.1 831076 74160 ? Sl 04:50 0:01 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 22079 0.0 13.5 837788 71104 ? Sl 04:50 0:00 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
If I can't find an answer, I'm going to have to do something desperate, like switch to nginx, which entails rewriting all my mod_perl pages at fastcgi pages, which will take a lot of effort.
What am I missing?
Lots of server stats follow.
Thanks,
Peter.
Apache Server Status for www.stairways.com
Server Version: Apache/2.2.9 (Debian) mod_perl/2.0.4 Perl/v5.10.0
Server Built: Jul 14 2009 20:40:18
Current Time: Friday, 20-Nov-2009 05:25:34 UTC
Restart Time: Thursday, 19-Nov-2009 02:39:50 UTC
Parent Server Generation: 0
Server uptime: 1 day 2 hours 45 minutes 44 seconds
Total accesses: 39589 - Total Traffic: 1.3 GB
CPU Usage: u11.96 s1.79 cu0 cs0 - .0143% CPU load
.411 requests/sec - 13.7 kB/second - 33.4 kB/request
42 requests currently being processed, 58 idle workers
RR_R_________R___R_RR_R_R.......................................
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__W_________R_RRRR_RRRRRR.......................................
______RRR___RR_RR_______R.......................................
__RR_R_RRRRR_R__R__RR_R__.......................................
.......R..RRR..RR.RRRRRRR.......................................
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Scoreboard Key:
"_" Waiting for Connection, "S" Starting up, "R" Reading Request,
"W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup,
"C" Closing connection, "L" Logging, "G" Gracefully finishing,
"I" Idle cleanup of worker, "." Open slot with no current process
Srv PID Acc M CPU SS Req Conn Child Slot Client VHost Request
0-0 21837 0/40/684 R 4.39 2120 32 0.0 0.45 16.35 ? ? ..reading..
0-0 21837 0/39/812 R 4.38 2120 4 0.0 0.43 18.44 ? ? ..reading..
0-0 21837 0/43/864 _ 5.08 0 12 0.0 2.35 33.86 x.x.x.x www.keyboardmaestro.com GET /action/sivc?A&R&03508000&5A08FFAC&Ye8A4gdY&00000000&000010
0-0 21837 0/37/715 R 4.39 2120 32 0.0 3.97 22.63 ? ? ..reading..
0-0 21837 0/36/541 _ 5.07 131 0 0.0 0.29 25.28 x.x.x.x www.keyboardmaestro.com GET /img/title-bg.jpg HTTP/1.1
0-0 21837 0/47/592 _ 5.06 383 12 0.0 0.71 11.08 x.x.x.x www.peter.com.au GET /articles/tshirts.html HTTP/1.1
0-0 21837 0/37/598 _ 5.06 240 8 0.0 1.18 14.41 x.x.x.x www.stairways.com GET /main/index HTTP/1.1
0-0 21837 0/55/517 _ 5.06 164 0 0.0 1.38 16.09 x.x.x.x slice.peter.com.au GET / HTTP/1.1
0-0 21837 0/47/573 _ 5.06 358 12 0.0 1.48 22.09 x.x.x.x www.peter.com.au GET /articles/3rd-birthday-party.html HTTP/1.1
0-0 21837 0/47/686 _ 5.07 69 0 0.0 0.83 19.77 x.x.x.x www.peter.com.au GET /styles/downtown.css HTTP/1.1
0-0 21837 0/51/626 _ 5.07 131 0 0.0 3.24 14.27 x.x.x.x www.keyboardmaestro.com GET /img/box-bg.png HTTP/1.1
0-0 21837 0/48/492 _ 5.06 209 0 0.0 1.53 12.46 x.x.x.x www.stairways.com GET /main/index HTTP/1.1
0-0 21837 0/40/545 _ 5.07 119 8 0.0 1.03 15.68 x.x.x.x www.stairways.com GET /blog/rss.xml HTTP/1.1
0-0 21837 0/38/463 R 4.38 2120 0 0.0 0.58 12.61 ? ? ..reading..
0-0 21837 0/59/531 _ 5.07 38 0 0.0 2.55 24.37 x.x.x.x www.stairways.com GET /favicon.ico HTTP/1.0
0-0 21837 0/41/748 _ 5.06 371 0 0.0 1.20 13.39 x.x.x.x www.peter.com.au GET /articles/nanny.html HTTP/1.1
0-0 21837 0/39/528 _ 5.06 172 0 0.0 0.82 18.76 x.x.x.x slice.peter.com.au GET / HTTP/1.1
0-0 21837 0/37/621 R 4.38 2120 4 0.0 0.59 14.62 ? ? ..reading..
0-0 21837 0/68/684 _ 5.06 141 12 0.0 0.27 14.87 x.x.x.x www.sungroper.asn.au GET /gallery/thumbs/2001-05-20-First-Car-Motion_01-Tension-Chan
0-0 21837 0/32/579 R 4.39 2120 32 0.0 0.80 23.05 ? ? ..reading..
0-0 21837 0/44/886 R 4.39 2119 0 0.0 0.37 14.49 ? ? ..reading..
0-0 21837 0/44/630 _ 5.06 219 32 0.0 1.07 39.68 x.x.x.x www.williamdawes.com GET /index.html HTTP/1.1
0-0 21837 0/36/654 R 4.39 2120 36 0.0 0.40 14.39 ? ? ..reading..
0-0 21837 0/46/638 _ 5.06 341 0 0.0 0.65 16.00 x.x.x.x www.peter.com.au GET /articles/pantograph.html HTTP/1.1
0-0 21837 0/41/697 R 4.39 2120 36 0.0 1.23 14.10 ? ? ..reading..
1-0 - 0/0/490 . 4.38 2110 0 0.0 0.00 13.16 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_35-WSC-Trophy-presenta
1-0 - 0/0/385 . 4.33 2110 0 0.0 0.00 14.40 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-22-Race-Day-5_37-Loading-Trailer.jpg
1-0 - 0/0/444 . 4.59 2110 4 0.0 0.00 28.01 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-23-Race-Day-6_05-Sungroper-passing.j
1-0 - 0/0/439 . 4.59 2110 0 0.0 0.00 9.25 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_33-National-Wine-Centr
1-0 - 0/0/355 . 4.46 2110 16 0.0 0.00 41.68 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-25-Race-Day-8_14-Living-Room.jpg HTT
1-0 - 0/0/352 . 4.26 2110 4 0.0 0.00 9.74 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-22-Race-Day-5_28-South-of-Alice.jpg
1-0 - 0/0/481 . 4.38 2110 4 0.0 0.00 18.87 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_44-Pub-Crowd.jpg HTTP/
1-0 - 0/0/392 . 4.44 2110 0 0.0 0.00 15.70 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-24-Race-Day-7_52-Hotel-and-Renovatio
1-0 - 0/0/450 . 4.54 2110 4 0.0 0.00 10.83 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-26-Race-Day-9_08-Fiona-with-grin.jpg
1-0 - 0/0/474 . 4.44 2110 4 0.0 0.00 18.92 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-24-Race-Day-7_57-Cooberpedy.jpg HTTP
1-0 - 0/0/465 . 4.38 2110 0 0.0 0.00 14.43 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-22-Race-Day-5_26-In-Control-Stop.jpg
1-0 - 0/0/443 . 4.29 2110 28 0.0 0.00 39.75 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-22-Race-Day-5_36-Night-movement-of-S
1-0 - 0/0/367 . 4.39 2110 0 0.0 0.00 8.03 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-23-Race-Day-6_07-Border-Signage.jpg
1-0 - 0/0/333 . 4.38 2110 0 0.0 0.00 22.76 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-23-Race-Day-6_16-New-WSC-sponsor.jpg
1-0 - 0/0/481 . 4.59 2110 4 0.0 0.00 20.59 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-23-Race-Day-6_06-Care-Package-dropof
1-0 - 0/0/484 . 4.59 2110 0 0.0 0.00 12.06 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-24-Race-Day-7_49-smashed-spaceship.j
1-0 - 0/0/517 . 4.29 2110 32 0.0 0.00 11.96 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-22-Race-Day-5_35-Sungroper-and-Road-
1-0 - 0/0/499 . 4.26 2110 0 0.0 0.00 22.14 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-22-Race-Day-5_29-End-of-day-Charge.j
1-0 - 0/0/508 . 4.38 2110 0 0.0 0.00 12.90 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-23-Race-Day-6_15-Skip-under-geocache
1-0 - 0/0/581 . 4.59 2110 0 0.0 0.00 18.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-25-Race-Day-8_07-Afternoon-Charge.jp
1-0 - 0/0/597 . 4.29 2110 24 0.0 0.00 24.12 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-22-Race-Day-5_38-Sungroper-in-Traile
1-0 - 0/0/482 . 4.58 2110 0 0.0 0.00 10.63 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-24-Race-Day-7_50-Space-thingy.jpg HT
1-0 - 0/0/556 . 4.53 2110 0 0.0 0.00 17.22 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-26-Race-Day-9_09-Scrutineering.jpg H
1-0 - 0/0/545 . 4.59 2110 0 0.0 0.00 9.29 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-25-Race-Day-8_12-Bush-Camp-Caravan.j
1-0 - 0/0/379 . 4.59 2110 4 0.0 0.00 12.16 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_28-Bill-and-James-show
2-0 21995 0/12/494 _ 0.79 42 0 0.0 0.49 16.39 x.x.x.x www.keyboardmaestro.com GET /img/title-bg.jpg HTTP/1.1
2-0 21995 0/8/503 _ 0.71 130 0 0.0 0.03 10.83 x.x.x.x www.stairways.com GET /main/index HTTP/1.1
2-0 21995 0/8/435 W 0.71 0 0 0.0 0.02 12.95 x.x.x.x www.stairways.com GET /server-status HTTP/1.1
2-0 21995 0/17/391 _ 0.80 34 0 0.0 0.87 22.02 x.x.x.x www.keyboardmaestro.com GET /img/frames/setup-textedit-recording-example.png HTTP/1.1
2-0 21995 0/21/550 _ 0.80 34 0 0.0 0.07 8.29 x.x.x.x www.keyboardmaestro.com GET /img/box-bg.png HTTP/1.1
2-0 21995 0/12/330 _ 0.71 132 0 0.0 0.13 39.21 x.x.x.x www.peter.com.au GET /favicon.ico HTTP/1.1
2-0 21995 0/10/472 _ 0.71 166 12 0.0 0.06 7.57 x.x.x.x www.keyboardmaestro.com GET /action/sivc?A&R&02138000&C46DF21D&PUap3PJv&00000000&000010
2-0 21995 0/10/572 _ 0.71 131 604 0.0 0.13 18.40 x.x.x.x www.keyboardmaestro.com GET /img/frames/save-to-clippings-tutorial.png HTTP/1.1
2-0 21995 0/10/293 _ 0.71 138 0 0.0 0.11 17.67 x.x.x.x www.stairways.com GET /programming/ HTTP/1.1
2-0 21995 0/12/694 _ 0.84 38 196 0.0 0.09 10.16 x.x.x.x www.stairways.com GET /blog/2007-11-03-leopard-dock HTTP/1.0
2-0 21995 0/12/685 _ 0.71 219 0 0.0 0.09 16.44 x.x.x.x www.williamdawes.com GET / HTTP/1.1
2-0 21995 0/8/449 _ 0.71 179 4 0.0 0.12 16.65 x.x.x.x www.stairways.com GET /server-status HTTP/1.1
2-0 21995 0/0/802 R 1.92 2134 20 0.0 0.00 15.43 ? ? ..reading..
2-0 21995 0/8/500 _ 0.79 84 1528 0.0 0.09 15.62 x.x.x.x www.stairways.com GET /blog/rss.xml?full HTTP/1.1
2-0 21995 0/0/332 R 1.95 2134 16 0.0 0.00 12.70 ? ? ..reading..
2-0 21995 0/0/678 R 1.95 2134 12 0.0 0.00 13.89 ? ? ..reading..
2-0 21995 0/0/300 R 1.96 2134 12 0.0 0.00 4.86 ? ? ..reading..
2-0 21995 0/0/466 R 1.97 2134 12 0.0 0.00 10.76 ? ? ..reading..
2-0 21995 0/13/547 _ 0.80 34 0 0.0 0.06 12.04 x.x.x.x www.keyboardmaestro.com GET /img/frames/record-quick-macro-example.png HTTP/1.1
2-0 21995 0/0/343 R 2.01 2134 16 0.0 0.00 16.30 ? ? ..reading..
2-0 21995 0/0/356 R 2.02 2134 12 0.0 0.00 13.36 ? ? ..reading..
2-0 21995 0/0/469 R 2.02 2134 12 0.0 0.00 21.06 ? ? ..reading..
2-0 21995 0/0/474 R 2.05 2134 60 0.0 0.00 11.78 ? ? ..reading..
2-0 21995 0/0/355 R 2.07 2134 16 0.0 0.00 10.56 ? ? ..reading..
2-0 21995 0/0/426 R 2.08 2134 16 0.0 0.00 25.40 ? ? ..reading..
3-0 22023 0/13/13 _ 0.80 34 0 0.0 0.06 0.06 x.x.x.x www.keyboardmaestro.com GET /img/frames/save-to-clippings-tutorial.png HTTP/1.1
3-0 22023 0/12/12 _ 0.80 34 0 0.0 0.07 0.07 x.x.x.x www.keyboardmaestro.com GET /img/title-bg.jpg HTTP/1.1
3-0 22023 0/10/10 _ 0.71 131 556 0.0 0.60 0.60 x.x.x.x www.keyboardmaestro.com GET /img/frames/configuration.png HTTP/1.1
3-0 22023 0/5/5 _ 0.70 352 24 0.0 0.08 0.08 x.x.x.x www.peter.com.au GET /articles/honda-accord.html HTTP/1.1
3-0 22023 0/10/10 _ 0.71 130 4 0.0 0.15 0.15 x.x.x.x www.keyboardmaestro.com GET /favicon.ico HTTP/1.1
3-0 22023 0/6/6 _ 0.79 115 208 0.0 3.79 3.79 x.x.x.x www.stairways.com GET /blog/rss.xml?full HTTP/1.1
3-0 22023 0/1/1 R 0.22 2126 0 0.0 0.00 0.00 ? ? ..reading..
3-0 22023 0/1/1 R 0.22 2126 4 0.0 0.00 0.00 ? ? ..reading..
3-0 22023 0/1/1 R 0.21 2126 0 0.0 0.00 0.00 ? ? ..reading..
3-0 22023 0/4/4 _ 0.70 389 0 0.0 0.05 0.05 x.x.x.x www.peter.com.au GET /articles/tshirts.html HTTP/1.1
3-0 22023 0/9/9 _ 0.71 131 588 0.0 0.70 0.70 x.x.x.x www.keyboardmaestro.com GET /img/frames/create-a-simple-macro.png HTTP/1.1
3-0 22023 0/4/4 _ 0.70 365 4 0.0 0.02 0.02 x.x.x.x www.peter.com.au GET /articles/gingerbread-house.html HTTP/1.1
3-0 22023 0/1/1 R 0.22 2126 0 0.0 0.00 0.00 ? ? ..reading..
3-0 22023 0/1/1 R 0.22 2126 0 0.0 0.00 0.00 ? ? ..reading..
3-0 22023 0/7/7 _ 0.80 0 12 0.0 2.88 2.88 x.x.x.x www.peter.com.au GET /photos/photos/2002-12-19-Amy-Monica_01-Amy-Monica.jpg HTTP
3-0 22023 0/1/1 R 0.22 2126 0 0.0 0.00 0.00 ? ? ..reading..
3-0 22023 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
3-0 22023 0/7/7 _ 0.70 334 12 0.0 0.14 0.14 x.x.x.x www.peter.com.au GET /articles/housebuying.html HTTP/1.1
3-0 22023 0/5/5 _ 0.71 231 0 0.0 0.05 0.05 x.x.x.x www.keyboardmaestro.com GET /documentation/3/whatsnew HTTP/1.1
3-0 22023 0/5/5 _ 0.71 190 92 0.0 0.04 0.04 x.x.x.x www.peter.com.au GET /articles/pantograph-images/arms.png HTTP/1.1
3-0 22023 0/5/5 _ 0.80 38 0 0.0 0.01 0.01 x.x.x.x www.stairways.com GET /robots.txt HTTP/1.0
3-0 22023 0/5/5 _ 0.71 219 0 0.0 0.02 0.02 x.x.x.x williamdawes.com GET / HTTP/1.1
3-0 22023 0/4/4 _ 0.71 156 0 0.0 0.08 0.08 x.x.x.x www.peter.com.au GET /styles/downtown.css HTTP/1.1
3-0 22023 0/4/4 _ 0.71 171 0 0.0 0.00 0.00 x.x.x.x www.stairways.com GET /favicon.ico HTTP/1.1
3-0 22023 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/13/13 _ 0.78 131 548 0.0 0.22 0.22 x.x.x.x www.keyboardmaestro.com GET /img/frames/overview.png HTTP/1.1
4-0 22046 0/34/34 _ 0.78 122 0 0.0 0.50 0.50 x.x.x.x www.keyboardmaestro.com GET /documentation/3/whatsnew HTTP/1.1
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/8/8 _ 0.78 265 4 0.0 0.02 0.02 x.x.x.x www.stairways.com GET /action/store HTTP/1.1
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/7/7 _ 0.84 35 0 0.0 0.04 0.04 x.x.x.x www.stairways.com GET /css/blog.css HTTP/1.0
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/9/9 _ 0.78 131 0 0.0 0.63 0.63 x.x.x.x www.keyboardmaestro.com GET /img/frames/record-quick-macro-example.png HTTP/1.1
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/7/7 _ 0.78 150 3264 0.0 0.15 0.15 x.x.x.x www.peter.com.au GET /styles/perth_header.jpg HTTP/1.1
4-0 22046 0/6/6 _ 0.78 138 0 0.0 0.10 0.10 x.x.x.x www.peter.com.au GET /articles/pantograph-images/pencil.png HTTP/1.1
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/8/8 _ 0.78 211 0 0.0 0.06 0.06 x.x.x.x www.stairways.com GET /blog/rss-2008-05-13-microsoft-office-vba.xml HTTP/1.1
4-0 22046 0/6/6 _ 0.78 219 0 0.0 0.02 0.02 x.x.x.x www.williamdawes.com GET /robots.txt HTTP/1.1
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/15/15 _ 0.84 80 228 0.0 0.09 0.09 x.x.x.x www.stairways.com GET /blog/index HTTP/1.0
4-0 22046 0/0/0 R 0.00 2133 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/8/8 _ 0.78 182 0 0.0 0.10 0.10 x.x.x.x slice.peter.com.au GET / HTTP/1.1
4-0 22046 0/9/9 _ 0.84 34 0 0.0 0.19 0.19 x.x.x.x www.keyboardmaestro.com GET /img/frames/configuration.png HTTP/1.1
5-0 - 0/0/2 . 0.24 2112 0 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_19-Lord-Mayor-and-Nuna
5-0 - 0/0/2 . 0.24 2112 0 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_10-Team-Flag-and-Car.j
5-0 - 0/0/2 . 0.24 2112 0 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_12-or-not.jpg HTTP/1.1
5-0 - 0/0/2 . 0.31 2112 0 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_13-King-William-St.jpg
5-0 - 0/0/2 . 0.36 2112 4 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_11-Off-on-parade.jpg H
5-0 - 0/0/2 . 0.36 2112 0 0.0 0.00 0.01 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_20-Cars-on-Display.jpg
5-0 - 0/0/1 . 0.36 2112 8 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-21-Race-Day-4_20-Clever-Rock.jpg HTT
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
5-0 - 0/0/2 . 0.36 2112 0 0.0 0.00 0.01 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_09-Southern-Exposure.j
5-0 - 0/0/1 . 0.36 2112 12 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-21-Race-Day-4_23-Devils-Marbles.jpg
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
5-0 - 0/0/1 . 0.36 2112 8 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-21-Race-Day-4_27-Devils-Marbles.jpg
5-0 - 0/0/1 . 0.36 2112 12 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-21-Race-Day-4_28-Shay-and-Fe-Rock.jp
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
5-0 - 0/0/1 . 0.36 2112 0 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-21-Race-Day-4_35-Devils-Marbles.jpg
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 2132 0 0.0 0.00 0.00 ? ? ..reading..
Srv Child Server number - generation
PID OS process ID
Acc Number of accesses this connection / this child / this slot
M Mode of operation
CPU CPU usage, number of seconds
SS Seconds since beginning of most recent request
Req Milliseconds required to process most recent request
Conn Kilobytes transferred this connection
Child Megabytes transferred this child
Slot Total megabytes transferred this slot
Apache/2.2.9 Server at www.stairways.com Port 80
Timeout 45
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 5
<IfModule mpm_worker_module>
StartServers 2
MaxClients 150
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 1000
</IfModule>
slice:/etc/apache2# /usr/sbin/apache2 -f /etc/apache2/apache2.conf -l
Compiled in modules:
core.c
mod_log_config.c
mod_logio.c
worker.c
http_core.c
mod_so.c
-f /etc/apache2/apache2.conf -M
Loaded Modules:
core_module (static)
log_config_module (static)
logio_module (static)
mpm_worker_module (static)
http_module (static)
so_module (static)
authz_host_module (shared)
dir_module (shared)
env_module (shared)
headers_module (shared)
mime_module (shared)
negotiation_module (shared)
perl_module (shared)
rewrite_module (shared)
status_module (shared)
slice:/etc/apache2# /usr/sbin/apache2 -f /etc/apache2/apache2.conf -V
Server version: Apache/2.2.9 (Debian)
Server built: Jul 14 2009 20:40:18
Server's Module Magic Number: 20051115:15
Server loaded: APR 1.2.12, APR-Util 1.2.12
Compiled using: APR 1.2.12, APR-Util 1.2.12
Architecture: 64-bit
Server MPM: Worker
threaded: yes (fixed thread count)
forked: yes (variable process count)
Server compiled with....
-D APACHE_MPM_DIR="server/mpm/worker"
-D APR_HAS_SENDFILE
-D APR_HAS_MMAP
-D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
-D APR_USE_SYSVSEM_SERIALIZE
-D APR_USE_PTHREAD_SERIALIZE
-D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-D APR_HAS_OTHER_CHILD
-D AP_HAVE_RELIABLE_PIPED_LOGS
-D DYNAMIC_MODULE_LIMIT=128
-D HTTPD_ROOT=""
-D SUEXEC_BIN="/usr/lib/apache2/suexec"
-D DEFAULT_PIDLOG="/var/run/apache2.pid"
-D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
-D DEFAULT_ERRORLOG="logs/error_log"
-D AP_TYPES_CONFIG_FILE="/etc/apache2/mime.types"
-D SERVER_CONFIG_FILE="/etc/apache2/apache2.conf"
--
Clipboard Switching and Macros with Keyboard Maestro
Keyboard Maestro <http://www.keyboardmaestro.com/> Macros for your Mac
<http://www.stairways.com/> <http://download.stairways.com/>
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Re: [users@httpd] Memory / Process leak
Posted by Peter N Lewis <pe...@stairways.com.au>.
On 20/11/2009, at 18:20 , André Warnier wrote:
> Peter N Lewis wrote:
>> I already have:
>> MaxRequestsPerChild 1000
>> So the worker processes should die and clean that out.
>> I'm suspicious that the worker threads are not dieing because I've seen cases where there are worker threads listed in ps but not listed in server-status (that will probably show up tomorrow or the next day when the server has been running a bit longer, and I'll post details of that if I haven't got a response by then).
> You are talking about threads. What MPM are you using, on which platform ?
> Read http://httpd.apache.org/docs/2.2/mpm.html
> and try ./httpd -l
slice:/etc/apache2# /usr/sbin/apache2 -f /etc/apache2/apache2.conf -l
Compiled in modules:
core.c
mod_log_config.c
mod_logio.c
worker.c
http_core.c
mod_so.c
> All this is still a plaster over a real issue though. The real issue is that some module is leaking memory, and you should really find out which one and go from there. There may be an alternate module available or not, depending on the case.
My suspicion is it is more that it is leaking processes or threads that then never get tidied up. But I certainly could be wrong.
And at this point, I'll be happy to take some plaster - my site is not going to be so heavily used that I need more than plaster. I would like a better solution that frequent graceful restarts.
> It may also just be an application, not a Perl library module, that leaks memory. I would consider that in fact much more likely.
> What /are/ your "mod_perl pages" and what do they do ?
> Is there any possibility to narrow down the search to some likely suspects ?
> In the order of probabilities for memory leaks, I would consider, from most to least likely culprits :
> 1) perl application modules/pages
> 2) perl standard library modules handling XML
> 3) other perl standard library modules
> 4) Apache standard modules
> 5) Apache core code
Any suggestions on how to find it?
Here is what I find interesting. After leaving it for another day, I now have worker processes that are not listed in the server status.
root 19962 0.0 3.3 193708 17776 ? Ss Nov19 0:43 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 21837 0.0 3.4 531796 18088 ? Sl Nov20 0:07 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 21995 0.0 11.9 813848 62892 ? Sl Nov20 0:05 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 22023 0.0 7.5 737104 39496 ? Sl Nov20 0:04 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 22046 0.0 6.5 826992 34336 ? Sl Nov20 0:05 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 22079 0.0 3.6 837788 19304 ? Sl Nov20 0:00 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 22842 0.0 12.8 661912 67228 ? Sl Nov20 0:06 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 23370 0.0 10.6 458444 55696 ? Sl Nov20 0:09 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
www-data 23613 0.1 11.2 520912 58932 ? Sl 02:00 0:00 /usr/sbin/apache2 -f /etc/apache2/apache2.conf -k start
Processes 21837, 21995, 22842 are not listed in the server status.
Surely that is something quite wrong? If I kill those processes, I get back a significant amount of memory:
slice:/var/log/apache2# free -m
total used free shared buffers cached
Mem: 512 505 6 0 3 147
-/+ buffers/cache: 354 157
Swap: 1023 256 767
slice:/var/log/apache2# kill -9 21837 21995 22842
slice:/var/log/apache2# free -m
total used free shared buffers cached
Mem: 512 399 112 0 3 147
-/+ buffers/cache: 249 263
Swap: 1023 188 835
Still very confused.
Thanks,
Peter.
Server status is below.
Apache Server Status for www.stairways.com
Server Version: Apache/2.2.9 (Debian) mod_perl/2.0.4 Perl/v5.10.0
Server Built: Jul 14 2009 20:40:18
Current Time: Saturday, 21-Nov-2009 02:07:55 UTC
Restart Time: Thursday, 19-Nov-2009 02:39:50 UTC
Parent Server Generation: 0
Server uptime: 1 day 23 hours 28 minutes 5 seconds
Total accesses: 66968 - Total Traffic: 2.2 GB
CPU Usage: u17.53 s2.92 cu0 cs0 - .012% CPU load
.392 requests/sec - 13.4 kB/second - 34.2 kB/request
2 requests currently being processed, 48 idle workers
_________________________.......................................
................................................................
__WK_____________________.......................................
......RRR...RR.RR.......R.......................................
..RR.R.RRRRR.R..R..RR.R.........................................
.......R..RRR..RR.RRRRRRR.......................................
................................................................
................................................................
................................................................
................................................................
................................................................
................................................................
................................................................
................................................................
................................................................
................................................................
Scoreboard Key:
"_" Waiting for Connection, "S" Starting up, "R" Reading Request,
"W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup,
"C" Closing connection, "L" Logging, "G" Gracefully finishing,
"I" Idle cleanup of worker, "." Open slot with no current process
Srv PID Acc M CPU SS Req Conn Child Slot Client VHost Request
0-0 23613 0/6/709 _ 0.25 182 1428 0.0 1.18 19.45 x.x.x.x www.peter.com.au GET /metalwork/al-60-g0516-sieg-c6-m2/images/circuit-2-mill-dri
0-0 23613 0/3/833 _ 0.22 184 3576 0.0 0.53 19.12 x.x.x.x www.peter.com.au GET /metalwork/al-60-g0516-sieg-c6-m2/images/drawing-2100-milli
0-0 23613 0/3/1041 _ 0.25 182 4188 0.0 0.49 41.90 x.x.x.x www.peter.com.au GET /metalwork/al-60-g0516-sieg-c6-m2/images/drawing-10-10-stea
0-0 23613 0/4/1007 _ 0.29 176 1128 0.0 0.12 31.10 x.x.x.x www.keyboardmaestro.com GET /documentation/3/javascript/prototype.js HTTP/1.1
0-0 23613 0/5/980 _ 0.29 177 0 0.0 0.03 35.40 x.x.x.x www.keyboardmaestro.com GET /documentation/3/img/close.png HTTP/1.1
0-0 23613 0/3/729 _ 0.29 162 0 0.0 0.01 15.09 x.x.x.x store.stairways.com GET / HTTP/1.1
0-0 23613 0/3/741 _ 0.29 175 4 0.0 3.50 19.69 x.x.x.x www.keyboardmaestro.com GET /documentation/3/img/title-bg.jpg HTTP/1.1
0-0 23613 0/2/666 _ 0.32 138 32 0.0 0.03 23.50 x.x.x.x www.keyboardmaestro.com GET /action/sivc?A&R&02038000&C06EEE10&5Np6QVyI&00000000&000010
0-0 23613 0/2/809 _ 0.32 131 0 0.0 0.10 24.75 x.x.x.x www.peter.com.au GET /photos/photos/2002-07-17-Nanas-90th-Birthday_03-Liz-Neil-I
0-0 23613 0/2/831 _ 0.32 116 180 0.0 0.07 27.35 x.x.x.x www.peter.com.au GET /photos/photos/2002-09-02-3Brougham-Castle_0750.jpg HTTP/1.
0-0 23613 0/2/811 _ 0.32 114 176 0.0 0.08 16.62 x.x.x.x www.peter.com.au GET /photos/photos/2002-09-02-3Brougham-Castle_0743.jpg HTTP/1.
0-0 23613 0/2/621 _ 0.44 50 412 0.0 0.04 26.01 x.x.x.x www.stairways.com POST /blog/ HTTP/1.0
0-0 23613 0/2/1039 _ 0.44 22 16 0.0 0.01 39.40 x.x.x.x www.keyboardmaestro.com GET /action/sivc?A&R&03508000&597F9798&IZhMssjI&00000000&000010
0-0 23613 0/5/933 _ 0.44 1 0 0.0 0.04 26.53 x.x.x.x www.peter.com.au GET /articles/pantograph-images/pencil.png HTTP/1.1
0-0 23613 0/6/1292 _ 0.44 1 0 0.0 0.07 48.99 x.x.x.x www.peter.com.au GET /articles/pantograph-images/arms.png HTTP/1.1
0-0 23613 0/2/1259 _ 0.06 306 0 0.0 0.01 44.51 x.x.x.x www.peter.com.au GET /favicon.ico HTTP/1.1
0-0 23613 0/3/952 _ 0.06 290 0 0.0 0.03 39.72 x.x.x.x www.keyboardmaestro.com GET /favicon.ico HTTP/1.1
0-0 23613 0/2/1015 _ 0.06 291 0 0.0 0.14 26.80 x.x.x.x www.keyboardmaestro.com GET /img/frames/save-to-clippings-tutorial.png HTTP/1.1
0-0 23613 0/1/1326 _ 0.06 291 0 0.0 0.03 34.21 x.x.x.x www.keyboardmaestro.com GET /img/frames/setup-textedit-recording-example.png HTTP/1.1
0-0 23613 0/1/791 _ 0.06 279 8 0.0 0.02 36.57 x.x.x.x www.stairways.com GET /blog/rss.xml HTTP/1.1
0-0 23613 0/2/1248 _ 0.06 269 0 0.0 0.00 22.41 x.x.x.x www.peter.com.au GET /photos/thumbs/2004-01-17-Chair-Recovering-Episode-1_16-Rem
0-0 23613 0/1/1151 _ 0.06 230 0 0.0 0.00 60.70 x.x.x.x www.keyboardmaestro.com GET /favicon.ico HTTP/1.0
0-0 23613 0/2/1067 _ 0.22 192 4 0.0 0.04 31.67 x.x.x.x www.keyboardmaestro.com GET /img/frames/overview.png HTTP/1.1
0-0 23613 0/2/1255 _ 0.21 192 0 0.0 0.14 33.69 x.x.x.x www.keyboardmaestro.com GET /img/frames/configuration.png HTTP/1.1
0-0 23613 0/3/720 _ 0.22 192 0 0.0 0.03 14.41 x.x.x.x www.keyboardmaestro.com GET /img/mainbuttons/download-both.jpg HTTP/1.1
1-0 - 0/0/814 . 5.37 2144 4 0.0 0.00 17.80 x.x.x.x www.stairways.com GET /main/index HTTP/1.1
1-0 - 0/0/683 . 5.35 2144 20 0.0 0.00 29.60 x.x.x.x www.keyboardmaestro.com GET /action/sivc?A&R&02138000&BF75943C&BQHzyVyu&00000000&000010
1-0 - 0/0/771 . 5.34 2144 0 0.0 0.00 49.29 x.x.x.x www.sungroper.asn.au GET /gallery/thumbs/2001-05-27-Panel_05-Cells.jpg HTTP/1.1
1-0 - 0/0/796 . 5.34 2144 0 0.0 0.00 23.04 x.x.x.x www.stairways.com GET / HTTP/1.1
1-0 - 0/0/536 . 5.37 2144 12 0.0 0.00 53.79 x.x.x.x www.keyboardmaestro.com GET /action/sivc?A&R&03508000&578D5847&UZJ29rkg&00000000&000010
1-0 - 0/0/561 . 5.33 2144 0 0.0 0.00 14.31 x.x.x.x www.peter.com.au GET /photos/thumbs/2005-02-15-Bali-Resort_03-Robert.jpg HTTP/1.
1-0 - 0/0/693 . 5.28 2144 8 0.0 0.00 26.17 x.x.x.x www.stairways.com GET /blog/rss.xml HTTP/1.1
1-0 - 0/0/643 . 5.35 2144 8 0.0 0.00 31.38 x.x.x.x www.stairways.com GET /blog/rss.xml HTTP/1.1
1-0 - 0/0/620 . 5.35 2144 0 0.0 0.00 28.16 x.x.x.x www.sungroper.com GET /gallery/photos/2001-03-12-Car-Stuff_04-Seat-Mold.jpg HTTP/
1-0 - 0/0/684 . 5.35 2144 1164 0.0 0.00 38.32 x.x.x.x www.peter.com.au GET /styles/perth_header.jpg HTTP/1.1
1-0 - 0/0/626 . 5.34 2144 16 0.0 0.00 20.57 x.x.x.x www.sungroper.asn.au GET /gallery/photos/2001-07-14-Shell_05-Vacuum-Bag.jpg HTTP/1.1
1-0 - 0/0/755 . 5.35 2144 0 0.0 0.00 46.44 x.x.x.x www.keyboardmaestro.com GET /press/2005-04-14 HTTP/1.1
1-0 - 0/0/667 . 5.35 2144 0 0.0 0.00 19.10 x.x.x.x www.stairways.com HEAD / HTTP/1.1
1-0 - 0/0/659 . 5.35 2144 0 0.0 0.00 45.19 x.x.x.x www.keyboardmaestro.com GET / HTTP/1.0
1-0 - 0/0/669 . 5.34 2144 0 0.0 0.00 30.72 x.x.x.x slice.peter.com.au GET /robots.txt HTTP/1.1
1-0 - 0/0/669 . 5.35 2144 0 0.0 0.00 17.84 x.x.x.x www.keyboardmaestro.com GET /documentation/3/screenshots HTTP/1.1
1-0 - 0/0/924 . 5.35 2144 0 0.0 0.00 20.44 x.x.x.x www.stairways.com GET /favicon.ico HTTP/1.1
1-0 - 0/0/794 . 5.35 2144 0 0.0 0.00 30.36 x.x.x.x www.stairways.com GET /img/box-bg.png HTTP/1.1
1-0 - 0/0/773 . 5.37 2144 0 0.0 0.00 22.45 x.x.x.x www.peter.com.au GET /photos/photos/2005-03-12-Tabithas-Birthday-Party_03-Olivia
1-0 - 0/0/859 . 5.34 2144 16 0.0 0.00 30.89 x.x.x.x www.peter.com.au GET /photos/photos/2002-11-29-Amy-Isabel_04-Amy.jpg HTTP/1.1
1-0 - 0/0/859 . 5.35 2144 4 0.0 0.00 30.66 x.x.x.x www.peter.com.au GET /williamdawes/index.html HTTP/1.0
1-0 - 0/0/800 . 5.37 2144 0 0.0 0.00 21.98 x.x.x.x www.stairways.com GET /action/store HTTP/1.1
1-0 - 0/0/864 . 5.34 2144 0 0.0 0.00 27.29 x.x.x.x www.sungroper.asn.au GET /gallery/thumbs/2001-05-06-Tabbing~08-Tab-4.jpg HTTP/1.1
1-0 - 0/0/1099 . 5.33 2144 0 0.0 0.00 16.40 x.x.x.x www.peter.com.au GET /photos/thumbs/2005-02-13-Bali-Pouring-with-Rain_01-Sue-Rob
1-0 - 0/0/636 . 5.34 2144 0 0.0 0.00 19.75 x.x.x.x www.sungroper.asn.au GET /gallery/thumbs/2001-05-27-Panel_01-Template.jpg HTTP/1.1
2-0 23370 0/49/1031 _ 3.89 290 4 0.0 0.93 34.09 x.x.x.x www.keyboardmaestro.com GET /img/box-bg.png HTTP/1.1
2-0 23370 0/40/939 _ 3.89 290 0 0.0 0.75 21.27 x.x.x.x www.keyboardmaestro.com GET /img/title-bg.jpg HTTP/1.1
2-0 23370 0/80/913 W 3.88 0 0 0.0 0.95 31.80 x.x.x.x www.stairways.com GET /server-status HTTP/1.1
2-0 23370 1/78/853 K 4.06 1 940 51.2 0.50 37.11 x.x.x.x www.peter.com.au GET /articles/pantograph-images/pantograph.png HTTP/1.1
2-0 23370 0/33/826 _ 3.90 272 20 0.0 0.68 36.05 x.x.x.x www.stairways.com GET /blog/rss.xml HTTP/1.1
2-0 23370 0/41/780 _ 3.91 200 4 0.0 2.93 63.29 x.x.x.x www.stairways.com GET /server-status HTTP/1.1
2-0 23370 0/35/796 _ 3.89 290 0 0.0 0.65 11.60 x.x.x.x www.keyboardmaestro.com GET /img/mainbuttons/download-both.jpg HTTP/1.1
2-0 23370 0/57/1073 _ 4.00 192 0 0.0 0.85 34.47 x.x.x.x www.keyboardmaestro.com GET /img/frames/record-quick-macro-example.png HTTP/1.1
2-0 23370 0/63/727 _ 4.00 192 0 0.0 0.50 30.15 x.x.x.x www.keyboardmaestro.com GET /img/frames/setup-textedit-recording-example.png HTTP/1.1
2-0 23370 0/46/998 _ 3.89 289 0 0.0 0.59 55.68 x.x.x.x www.peter.com.au GET /articles/favicon.ico HTTP/1.1
2-0 23370 0/114/1168 _ 4.00 181 3864 0.0 2.91 31.16 x.x.x.x www.peter.com.au GET /metalwork/al-60-g0516-sieg-c6-m2/images/figure-2-lubricati
2-0 23370 0/136/1048 _ 3.91 267 20 0.0 1.11 32.85 x.x.x.x www.keyboardmaestro.com GET /action/sivc?A&R&02118000&BF4348C4&FQXhHvrN&00000000&000010
2-0 23370 0/117/919 _ 4.05 175 0 0.0 0.93 16.36 x.x.x.x www.keyboardmaestro.com GET /documentation/3/img/keyboardmaestro-title-icon.png HTTP/1.
2-0 23370 0/41/866 _ 4.00 185 0 0.0 0.69 26.39 x.x.x.x www.keyboardmaestro.com GET /main/dummy.mov HTTP/1.1
2-0 23370 0/51/383 _ 4.06 51 12 0.0 0.56 13.25 x.x.x.x www.stairways.com GET /blog/2006-12-07-applescript-edit-with HTTP/1.0
2-0 23370 0/40/718 _ 4.05 130 0 0.0 0.74 14.62 x.x.x.x www.sungroper.asn.au GET /howto/index.html HTTP/1.1
2-0 23370 0/35/335 _ 4.05 149 0 0.0 4.48 9.34 x.x.x.x www.sungroper.asn.au GET /project/solar-panel.html HTTP/1.0
2-0 23370 0/134/600 _ 4.00 184 0 0.0 2.18 12.93 x.x.x.x www.peter.com.au GET /metalwork/al-60-g0516-sieg-c6-m2/images/circuit-1-lathe.gi
2-0 23370 0/115/1112 _ 4.00 182 2092 0.0 1.64 28.84 x.x.x.x www.peter.com.au GET /metalwork/al-60-g0516-sieg-c6-m2/images/milling-drilling-f
2-0 23370 0/34/377 _ 4.05 137 0 0.0 0.42 16.73 x.x.x.x www.keyboardmaestro.com GET /documentation/3/preferences.html HTTP/1.1
2-0 23370 0/38/394 _ 4.05 174 0 0.0 0.55 13.91 x.x.x.x www.keyboardmaestro.com GET /documentation/3/programswitcher.html HTTP/1.1
2-0 23370 0/37/506 _ 4.05 109 0 0.0 1.51 22.57 x.x.x.x www.peter.com.au GET /photos/photos/2002-09-02-3Brougham-Castle_0744.jpg HTTP/1.
2-0 23370 0/114/588 _ 4.05 175 0 0.0 1.11 12.89 x.x.x.x www.keyboardmaestro.com GET /documentation/3/img/box-bg.png HTTP/1.1
2-0 23370 0/75/430 _ 4.06 2 0 0.0 2.33 12.88 x.x.x.x www.peter.com.au GET /styles/downtown.css HTTP/1.1
2-0 23370 0/87/513 _ 4.06 38 0 0.0 1.07 26.47 x.x.x.x slice.peter.com.au GET / HTTP/1.0
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3-0 22023 0/1/1 R 0.22 76667 0 0.0 0.00 0.00 ? ? ..reading..
3-0 22023 0/1/1 R 0.22 76667 4 0.0 0.00 0.00 ? ? ..reading..
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3-0 22023 0/1/1 R 0.22 76667 0 0.0 0.00 0.00 ? ? ..reading..
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3-0 22023 0/1/1 R 0.22 76667 0 0.0 0.00 0.00 ? ? ..reading..
3-0 22023 0/0/0 R 0.00 76674 0 0.0 0.00 0.00 ? ? ..reading..
3-0 - 0/0/241 . 4.88 54611 8 0.0 0.00 4.74 x.x.x.x www.stairways.com GET /blog/rss.xml HTTP/1.1
3-0 - 0/0/118 . 4.87 54611 0 0.0 0.00 1.00 x.x.x.x www.stairways.com GET /sivc/anarchie?A&R&03628000&BCC13800&C0A80C75 HTTP/1.0
3-0 - 0/0/147 . 4.90 54611 12 0.0 0.00 3.36 x.x.x.x www.peter.com.au GET /photos/day/2002-08-20-Parnu.html HTTP/1.1
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3-0 22023 0/0/0 R 0.00 76674 0 0.0 0.00 0.00 ? ? ..reading..
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4-0 22046 0/0/0 R 0.00 76674 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/0/0 R 0.00 76674 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/0/0 R 0.00 76674 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/0/0 R 0.00 76674 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/0/0 R 0.00 76674 0 0.0 0.00 0.00 ? ? ..reading..
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4-0 22046 0/0/0 R 0.00 76674 0 0.0 0.00 0.00 ? ? ..reading..
4-0 - 0/0/302 . 5.31 54723 4 0.0 0.00 2.67 x.x.x.x www.peter.com.au GET /styles/downtown.css HTTP/1.1
4-0 - 0/0/269 . 5.31 54723 548 0.0 0.00 5.64 x.x.x.x www.peter.com.au GET /photos/photos/2005-05-30-Nikolas-Birthday_08-Penguin-Walk.
4-0 22046 0/0/0 R 0.00 76674 0 0.0 0.00 0.00 ? ? ..reading..
4-0 - 0/0/152 . 5.30 54723 472 0.0 0.00 2.14 x.x.x.x www.peter.com.au GET /styles/perth_header.jpg HTTP/1.1
4-0 - 0/0/273 . 5.29 54723 12 0.0 0.00 3.73 x.x.x.x www.stairways.com GET /blog/rss.xml HTTP/1.1
4-0 22046 0/0/0 R 0.00 76674 0 0.0 0.00 0.00 ? ? ..reading..
4-0 22046 0/0/0 R 0.00 76674 0 0.0 0.00 0.00 ? ? ..reading..
4-0 - 0/0/332 . 5.31 54723 440 0.0 0.00 2.96 x.x.x.x www.peter.com.au GET /photos/photos/2005-05-30-Nikolas-Birthday_08-Penguin-Walk.
4-0 22046 0/0/0 R 0.00 76674 0 0.0 0.00 0.00 ? ? ..reading..
4-0 - 0/0/117 . 5.31 54723 1020 0.0 0.00 12.88 x.x.x.x www.peter.com.au GET /photos/photos/2005-05-30-Nikolas-Birthday_08-Penguin-Walk.
4-0 - 0/0/248 . 5.31 54723 4 0.0 0.00 2.14 x.x.x.x www.stairways.com GET /main/about HTTP/1.0
5-0 - 0/0/2 . 0.24 76653 0 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_19-Lord-Mayor-and-Nuna
5-0 - 0/0/2 . 0.24 76653 0 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_10-Team-Flag-and-Car.j
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5-0 - 0/0/2 . 0.31 76653 0 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_13-King-William-St.jpg
5-0 - 0/0/2 . 0.36 76653 4 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_11-Off-on-parade.jpg H
5-0 - 0/0/2 . 0.36 76653 0 0.0 0.00 0.01 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-27-Parade-Day_20-Cars-on-Display.jpg
5-0 - 0/0/1 . 0.36 76653 8 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-21-Race-Day-4_20-Clever-Rock.jpg HTT
5-0 22079 0/0/0 R 0.00 76673 0 0.0 0.00 0.00 ? ? ..reading..
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5-0 - 0/0/1 . 0.36 76653 12 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-21-Race-Day-4_23-Devils-Marbles.jpg
5-0 22079 0/0/0 R 0.00 76673 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 76673 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 76673 0 0.0 0.00 0.00 ? ? ..reading..
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5-0 - 0/0/1 . 0.36 76653 12 0.0 0.00 0.00 x.x.x.x www.peter.com.au GET /photos/thumbs/2001-11-21-Race-Day-4_28-Shay-and-Fe-Rock.jp
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5-0 22079 0/0/0 R 0.00 76673 0 0.0 0.00 0.00 ? ? ..reading..
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5-0 22079 0/0/0 R 0.00 76673 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 76673 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 76673 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 76673 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 76673 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 76673 0 0.0 0.00 0.00 ? ? ..reading..
5-0 22079 0/0/0 R 0.00 76673 0 0.0 0.00 0.00 ? ? ..reading..
Srv Child Server number - generation
PID OS process ID
Acc Number of accesses this connection / this child / this slot
M Mode of operation
CPU CPU usage, number of seconds
SS Seconds since beginning of most recent request
Req Milliseconds required to process most recent request
Conn Kilobytes transferred this connection
Child Megabytes transferred this child
Slot Total megabytes transferred this slot
Apache/2.2.9 Server at www.stairways.com Port 80
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Re: [users@httpd] Memory / Process leak
Posted by André Warnier <aw...@ice-sa.com>.
Peter N Lewis wrote:
>
> I already have:
>
> MaxRequestsPerChild 1000
>
> So the worker processes should die and clean that out.
>
> I'm suspicious that the worker threads are not dieing because I've seen cases where there are worker threads listed in ps but not listed in server-status (that will probably show up tomorrow or the next day when the server has been running a bit longer, and I'll post details of that if I haven't got a response by then).
>
You are talking about threads. What MPM are you using, on which platform ?
Read http://httpd.apache.org/docs/2.2/mpm.html
and try ./httpd -l
You may need MaxRequestsPerThread instead.
Also, there are subtleties as to when Perl interpreter threads/instances
are created/re-used/killed, depending on the mod_perl configuration.
You may want to investigate that a bit more in-depth.
All this is still a plaster over a real issue though. The real issue is
that some module is leaking memory, and you should really find out which
one and go from there. There may be an alternate module available or
not, depending on the case.
It may also just be an application, not a Perl library module, that
leaks memory. I would consider that in fact much more likely.
What /are/ your "mod_perl pages" and what do they do ?
Is there any possibility to narrow down the search to some likely suspects ?
In the order of probabilities for memory leaks, I would consider, from
most to least likely culprits :
1) perl application modules/pages
2) perl standard library modules handling XML
3) other perl standard library modules
4) Apache standard modules
5) Apache core code
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[users@httpd] Re: Memory / Process leak
Posted by Dan Poirier <po...@pobox.com>.
Nick Kew <ni...@webthing.com> writes:
> On 20 Nov 2009, at 09:59, Peter N Lewis wrote:
>> I already have:
>>
>> MaxRequestsPerChild 1000
>
> That's ridiculously low!
Which might be part of the problem. After only handling 1000 requests,
a child process will /start/ to exit - but it can't really go away until
all its current requests have completed. So if this is happening too
often, you can end up with a lot of "extra" child processes waiting for
requests to complete, and tying up memory.
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Re: [users@httpd] Memory / Process leak
Posted by Peter N Lewis <pe...@stairways.com.au>.
Clearly, no one has any particularly helpful suggestions on what to do differently.
Apache, even under relatively light load, swallowed up 700+MB over two days.
So the only path forward I can see is to restart apache fairly regularly and delve in to switching to nginx.
Thanks to those of you who tried to help. Maybe it is specific to slicehost. Maybe its something in how I use MySQL or mod_perl. Clearly this is beyond my ability to resolve, and is not some sort of well known problem.
Thanks anyway,
Peter.
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Re: [users@httpd] Memory / Process leak
Posted by Peter N Lewis <pe...@stairways.com.au>.
On 20/11/2009, at 18:21 , Nick Kew wrote:
> On 20 Nov 2009, at 09:59, Peter N Lewis wrote:
>
>> On 20/11/2009, at 17:29 , André Warnier wrote:
>>
>>> Peter N Lewis wrote:
>>>> I am having a serious problem with my site running out of memory. apache is leaking memory/processes.
>
> You mentioned slicehost. I have a slice, and I see a problem there which
> I see nowhere else of apache eating obscene amounts of memory.
> I don't know why, but my suspicion is that it doesn't play well with
> their virtualised environment.
>
> My current dirty-hack workaround is to run apachectl graceful in a cron job.
Maybe I'll end up having to do that too. I was certainly hoping for a better solution.
>> I already have:
>>
>> MaxRequestsPerChild 1000
>
> That's ridiculously low!
I added that in an effort to get the processes to quit and release the memory. If anything, it appears to have improved the situation, but the problem was around before that.
Besides, my site only gets a request per second on average, so it should only be restarting them every fifteen minutes or so, which should hardly put undo strain on the system!
On 20/11/2009, at 21:08 , Dan Poirier wrote:
>>> MaxRequestsPerChild 1000
>>
>> That's ridiculously low!
>
> Which might be part of the problem. After only handling 1000 requests,
> a child process will /start/ to exit - but it can't really go away until
> all its current requests have completed. So if this is happening too
> often, you can end up with a lot of "extra" child processes waiting for
> requests to complete, and tying up memory.
Sure, but unless I was having 1000 requests per second what would it matter? Even if it took a minute to die, it should still have long since died before its replacement was ready to die, right?
If things were working properly that is. Maybe they aren't dieing properly.
Thanks,
Peter.
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Re: [users@httpd] Memory / Process leak
Posted by Nick Kew <ni...@webthing.com>.
On 20 Nov 2009, at 09:59, Peter N Lewis wrote:
> On 20/11/2009, at 17:29 , André Warnier wrote:
>
>> Peter N Lewis wrote:
>>> I am having a serious problem with my site running out of memory. apache is leaking memory/processes.
You mentioned slicehost. I have a slice, and I see a problem there which
I see nowhere else of apache eating obscene amounts of memory.
I don't know why, but my suspicion is that it doesn't play well with
their virtualised environment.
My current dirty-hack workaround is to run apachectl graceful in a cron job.
> I already have:
>
> MaxRequestsPerChild 1000
That's ridiculously low!
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Re: [users@httpd] Memory / Process leak
Posted by Peter N Lewis <pe...@stairways.com.au>.
On 20/11/2009, at 17:29 , André Warnier wrote:
> Peter N Lewis wrote:
>> I am having a serious problem with my site running out of memory. apache is leaking memory/processes.
>
> Probably a lot more likely : your "mod_perl pages" are leaking memory.
> Perl will grab memory as needed, and once grabbed, will never release it to the OS until perl itself terminates, which rarely happens under Apache/mod_perl.
> Some perl modules do leak memory. In my experience, for example various XML-parsing modules do. It can be tricky to track down, because one "innocent" module may "use" another "not innocent" module etc..
> If/when you track it down, it may be possible (although inefficient) to isolate the bit which leaks memory, by converting it to a call to an external process.
> Another possible solution is to work with a prefork version of Apache, and make it so that each child handles only a number of requests, and then is killed and restarted. I don't remember the details, but in most configurations this will also restart that child's perl interpreter, ergo free its memory back to the OS.
> Look up this :
I already have:
MaxRequestsPerChild 1000
So the worker processes should die and clean that out.
I'm suspicious that the worker threads are not dieing because I've seen cases where there are worker threads listed in ps but not listed in server-status (that will probably show up tomorrow or the next day when the server has been running a bit longer, and I'll post details of that if I haven't got a response by then).
Thanks,
Peter.
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Re: [users@httpd] Memory / Process leak
Posted by André Warnier <aw...@ice-sa.com>.
Peter N Lewis wrote:
> I am having a serious problem with my site running out of memory. apache is leaking memory/processes.
Probably a lot more likely : your "mod_perl pages" are leaking memory.
Perl will grab memory as needed, and once grabbed, will never release it
to the OS until perl itself terminates, which rarely happens under
Apache/mod_perl.
Some perl modules do leak memory. In my experience, for example various
XML-parsing modules do. It can be tricky to track down, because one
"innocent" module may "use" another "not innocent" module etc..
If/when you track it down, it may be possible (although inefficient) to
isolate the bit which leaks memory, by converting it to a call to an
external process.
Another possible solution is to work with a prefork version of Apache,
and make it so that each child handles only a number of requests, and
then is killed and restarted. I don't remember the details, but in most
configurations this will also restart that child's perl interpreter,
ergo free its memory back to the OS.
Look up this :
http://httpd.apache.org/docs/2.2/mod/mpm_common.html#maxrequestsperchild
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