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Posted to user@cassandra.apache.org by Philippe <wa...@gmail.com> on 2011/12/08 20:39:34 UTC
CPU -> 0% on nodes
Hello (5-nodes, RF=3, 32GB RAM, 0.8.6, BOP, 6x2.33Ghz AMD cores)
I'm encountering a weird issue on my CPU-bound workload. Basically I have
two processes
- one is sending counter increments as fast as it can for a couple tens of
seconds. When few were issued it sleeps for 30 seconds
- another is reading thousands of keys per second, computing a PNG and
writing the PNG out. I've got about a dozen threads doing this in //
When the cluster is loaded, the first process starts timing out. When this
happens, the nodes just freeze all at the same time : CPU goes down to 0
(as seen below). This happens every single time. And I can see the second
process gets paused during this timeout
Any ideas why this might be happening ?
Thanks
Philippe
0 0 128 165472 8304 14347412 0 0 0 0 289 281 0 0
100 0
5 0 128 166452 8288 14337836 0 0 2 32 449 483 1 1
98 0
0 1 128 170252 8288 14337872 0 0 6 0 551 597 1 1
98 0
1 0 128 180968 8280 14329708 0 0 0 16 2276 2151 12 3
84 0
2 0 128 166788 8288 14329900 0 0 0 58 2368 2316 13 4
83 0
0 0 128 179676 8288 14329960 0 0 94 10 2438 2411 13 4
83 0
4 1 128 173012 8296 14331244 0 0 660 26 22201 40483 50 8
40 1
21 0 128 172224 8296 14333276 0 0 926 146 29059 52564 70 9
19 1
20 0 128 164532 8296 14335092 0 0 814 36 31140 72887 75 10
14 1
10 0 128 160648 8304 14335316 0 0 46 52 31737 85292 78 11
11 0
38 0 128 167832 8304 14328224 0 0 298 0 26278 71371 79 8
12 0
7 0 128 177600 8304 14328656 0 0 216 0 23951 66422 78 9
13 1
4 0 128 177776 8312 14332372 0 0 2116 330 15475 24864 47 7
43 3
1 0 128 177840 8312 14332208 0 0 0 15 2719 2646 13 4
83 0
1 0 128 165456 8320 14332424 0 0 0 42 3013 2786 15 3
81 0
3 0 128 178776 8320 14332332 0 0 0 10 21238 47980 44 8
47 0
1 0 128 179048 8320 14332332 0 0 0 0 8365 11498 28 6
66 0
0 0 128 178476 8328 14332396 0 0 0 38 7135 8871 26 3
71 0
1 0 128 177004 8328 14332336 0 0 0 34 4220 4494 17 3
80 0
1 0 128 178364 8336 14332368 0 0 0 40 6023 6676 20 4
76 0
1 0 128 165420 8336 14332432 0 0 0 10 7590 8065 27 5
69 0
0 0 128 179204 8336 14332368 0 0 0 6 8593 10051 29 5
66 0
3 0 128 166092 8344 14332368 0 0 0 26 3416 3709 11 2
87 0
1 0 128 174644 8344 14332332 0 0 0 14 2193 2178 13 4
83 0
1 0 128 178216 8344 14332332 0 0 0 0 2019 1955 12 3
85 0
8 0 128 177256 8352 14333704 0 0 558 74 17155 28102 50 6
44 0
13 0 128 176964 8352 14334388 0 0 262 4 25344 43567 56 9
34 1
20 0 128 176472 8360 14334120 0 0 116 276 21765 35447 46 9
44 0
8 0 128 180508 8356 14329500 0 0 1494 18 30749 42590 53 10
36 2
1 0 128 164908 8356 14331800 0 0 1006 0 23405 37877 59 9
33 0
10 0 128 178016 8364 14332748 0 0 424 44 24255 37797 55 9
36 0
1 0 128 174984 8364 14333828 0 0 538 0 24787 41429 56 9
35 1
10 1 128 175436 8372 14335028 0 0 734 358 28829 47777 54 9
36 0
11 0 128 176576 8372 14335220 0 0 92 18 28132 50177 55 8
37 0
3 0 128 176476 8372 14335288 0 0 34 0 23369 36918 36 6
58 0
6 0 128 176104 8380 14335556 0 0 134 34 23846 38779 40 6
54 0
0 0 128 176200 8380 14335784 0 0 114 4 6777 8368 16 1
83 0
procs -----------memory---------- ---swap-- -----io---- -system--
----cpu----
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wa
1 0 128 176456 8380 14335456 0 0 0 162 4968 5861 12 1
87 0
0 0 128 176588 8388 14335520 0 0 0 44 288 282 0 0
100 0
0 0 128 176752 8388 14335524 0 0 0 2 253 242 0 0
100 0
0 0 128 176752 8388 14335524 0 0 0 0 286 275 0 0
100 0
0 0 128 176924 8388 14335524 0 0 0 0 260 250 0 0
100 0