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Posted to users@tomcat.apache.org by sesfei <se...@yahoo.co.jp> on 2010/05/27 11:03:15 UTC
the gc question with tomcat
hi, all
there is a problem with my webapp.
by manual configuration, i allocated 1G(1024M) memory for webapp.
where the gc new capacity automatically is 262M, the gc old capacity
automatically is 699M, S0/S1 automatically is 43.6M/43.6M., PC automatically
is 42M
When my webapp is started, I use the jvm's own tools(jstat) to trace the
garbage collections.
the Utilization rate of the PC capacity is always 100%. is it normal?
Firstly the 1 Full GC is occurrenced within 1 hour,
5 hours later that took place within 1 hour 100 Full GC.
is it normal?
[web operating environment:]
tomcat5.5.27 + Apache/2.2.3 + jdk1.5.0_13 + Linux_x86_64
[blow is my manual configurations for tomcat JVM:]
CATALINA_OPTS="-Xms1024M -Xmx1024M -Dorg.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false"
[Jstat Tracking data (csv data)]
systime, S0C, S1C, S0U, S1U, EC, EU, OC, OU, PC, PU, YGC, YGCT,
FGCT, GCT
11:13:41, 9600, 3392, 0, 3369.3, 53568, 36562.3, 699072, 481787.7,
61184, 61167, 249, 3.148, 0.005, 3.153
11:48:02, 4032, 3520, 0, 3520, 39616, 0, 699072, 697526, 67712,
67573.5, 385, 4.849, 0.005, 4.854
13:23:53, 2496, 2496, 0, 0, 29568, 5620.2, 699072, 100281.5, 71360,
71236.5, 1003, 10.057, 3.48, 13.537
14:49:13, 2624, 2624, 0, 0, 27712, 12302, 679936, 74349.4, 78080,
71771.3, 1898, 15.979, 3.962, 19.941
16:07:54, 3392, 3712, 1664, 0, 50496, 28601.3, 688000, 109525.6,
78080, 74945.2, 2804, 21.46, 4.567, 26.027
16:24:03, 4480, 2304, 0, 0, 77632, 27240.9, 656960, 103414.1,
78080, 75622.1, 3107, 23.191, 4.943, 28.134
16:33:39, 4160, 2304, 0, 0, 78144, 25196.7, 658752, 98731.2, 78080,
76421.6, 3365, 24.604, 5.329, 29.933
16:41:50, 5568, 3008, 0, 2952.4, 103424, 96055.6, 606976, 69788.7,
78080, 74229.1, 3591, 25.889, 5.742, 31.631
16:42:40, 7360, 10176, 0, 0, 174464, 0, 652544, 91210.1, 86016,
86010.7, 3620, 26.067, 6.081, 32.148
16:43:25, 19520, 19200, 0, 0, 179328, 12770.2, 681728, 55882.2,
86016, 84680.4, 3637, 26.329, 7.634, 33.963
16:44:22, 21376, 20608, 0, 0, 181504, 13683.9, 681600, 55718.4,
86016, 84905.3, 3653, 26.507, 8.276, 34.784
16:47:34, 22656, 23744, 17914.8, 0, 182656, 135109.5, 687232,
56195.2, 86016, 85854.9, 3710, 27.079, 9.954, 37.032
16:51:16, 23360, 24064, 0, 0, 183872, 6675.4, 695232, 56231, 86016,
84901.6, 3784, 27.828, 13.631, 41.459
16:53:46, 24768, 23808, 0, 18298.8, 191872, 161459.7, 695616,
56960.4, 86016, 85728.5, 3833, 28.605, 15.221, 43.826
16:57:43, 28800, 26944, 0, 21923, 200768, 5245.9, 699072, 66807,
86016, 85505, 3909, 29.494, 17.746, 47.24
17:02:02, 28608, 10752, 0, 10720, 205824, 118015.1, 696128, 56332.7,
86016, 85880.8, 3999, 30.492, 22.473, 52.965
17:03:57, 32384, 32448, 17668.8, 0, 209152, 64383, 699072, 65796.8,
86016, 85142.6, 4038, 31.049, 24.71, 55.759
17:09:19, 32256, 32576, 18938.8, 0, 224512, 43783.8, 699072,
73448.4, 86016, 84862.6, 4146, 32.986, 30.05, 63.035
17:12:59, 54208, 52608, 0, 36976.4, 224640, 76931.5, 699072,
63084.4, 86016, 85367, 4221, 34.258, 33.295, 67.553
17:16:21, 45632, 45760, 26864.6, 0, 224512, 158991.5, 699072, 60327,
86016, 85273.6, 4356, 37.225, 35.458, 72.683
17:24:47, 29120, 30016, 0, 14856.2, 274944, 103582.1, 697344,
57937.4, 86016, 85176.8, 4525, 40.282, 40.071, 80.352
17:33:57, 32832, 34688, 25448.2, 0, 250560, 19438.8, 695808, 55692,
86016, 85489.8, 4686, 44.335, 44.935, 89.27
17:44:33, 29952, 28672, 0, 22952.2, 280896, 175914.9, 696512,
85648.5, 86016, 85940.8, 4845, 47.238, 47.198, 94.436
thanks..
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Re: the gc question with tomcat
Posted by Pid <pi...@pidster.com>.
On 27/05/2010 10:03, sesfei wrote:
> hi, all
>
> there is a problem with my webapp.
What is the problem exactly?
> by manual configuration, i allocated 1G(1024M) memory for webapp.
> where the gc new capacity automatically is 262M, the gc old capacity
> automatically is 699M, S0/S1 automatically is 43.6M/43.6M., PC
> automatically
> is 42M
>
> When my webapp is started, I use the jvm's own tools(jstat) to trace the
> garbage collections.
> the Utilization rate of the PC capacity is always 100%. is it normal?
If you're reading the stats correctly, it would be right on the edge of
an OOM, I think.
You can also use jmap -heap <pid> to get a more readable output of the
current heap status. You can post that here too.
> Firstly the 1 Full GC is occurrenced within 1 hour,
> 5 hours later that took place within 1 hour 100 Full GC.
> is it normal?
Probably. Depends on your app.
p
> [web operating environment:]
> tomcat5.5.27 + Apache/2.2.3 + jdk1.5.0_13 + Linux_x86_64
>
> [blow is my manual configurations for tomcat JVM:]
> CATALINA_OPTS="-Xms1024M -Xmx1024M
> -Dorg.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false"
>
> [Jstat Tracking data (csv data)]
> systime, S0C, S1C, S0U, S1U, EC, EU, OC, OU, PC, PU, YGC, YGCT,
> FGCT, GCT
> 11:13:41, 9600, 3392, 0, 3369.3, 53568, 36562.3, 699072, 481787.7,
> 61184, 61167, 249, 3.148, 0.005, 3.153
> 11:48:02, 4032, 3520, 0, 3520, 39616, 0, 699072, 697526, 67712,
> 67573.5, 385, 4.849, 0.005, 4.854
> 13:23:53, 2496, 2496, 0, 0, 29568, 5620.2, 699072, 100281.5,
> 71360,
> 71236.5, 1003, 10.057, 3.48, 13.537
> 14:49:13, 2624, 2624, 0, 0, 27712, 12302, 679936, 74349.4, 78080,
> 71771.3, 1898, 15.979, 3.962, 19.941
> 16:07:54, 3392, 3712, 1664, 0, 50496, 28601.3, 688000, 109525.6,
> 78080, 74945.2, 2804, 21.46, 4.567, 26.027
> 16:24:03, 4480, 2304, 0, 0, 77632, 27240.9, 656960, 103414.1,
> 78080, 75622.1, 3107, 23.191, 4.943, 28.134
> 16:33:39, 4160, 2304, 0, 0, 78144, 25196.7, 658752, 98731.2,
> 78080,
> 76421.6, 3365, 24.604, 5.329, 29.933
> 16:41:50, 5568, 3008, 0, 2952.4, 103424, 96055.6, 606976, 69788.7,
> 78080, 74229.1, 3591, 25.889, 5.742, 31.631
> 16:42:40, 7360, 10176, 0, 0, 174464, 0, 652544, 91210.1, 86016,
> 86010.7, 3620, 26.067, 6.081, 32.148
> 16:43:25, 19520, 19200, 0, 0, 179328, 12770.2, 681728, 55882.2,
> 86016, 84680.4, 3637, 26.329, 7.634, 33.963
> 16:44:22, 21376, 20608, 0, 0, 181504, 13683.9, 681600, 55718.4,
> 86016, 84905.3, 3653, 26.507, 8.276, 34.784
> 16:47:34, 22656, 23744, 17914.8, 0, 182656, 135109.5, 687232,
> 56195.2, 86016, 85854.9, 3710, 27.079, 9.954, 37.032
> 16:51:16, 23360, 24064, 0, 0, 183872, 6675.4, 695232, 56231,
> 86016,
> 84901.6, 3784, 27.828, 13.631, 41.459
> 16:53:46, 24768, 23808, 0, 18298.8, 191872, 161459.7, 695616,
> 56960.4, 86016, 85728.5, 3833, 28.605, 15.221, 43.826
> 16:57:43, 28800, 26944, 0, 21923, 200768, 5245.9, 699072, 66807,
> 86016, 85505, 3909, 29.494, 17.746, 47.24
> 17:02:02, 28608, 10752, 0, 10720, 205824, 118015.1, 696128,
> 56332.7,
> 86016, 85880.8, 3999, 30.492, 22.473, 52.965
> 17:03:57, 32384, 32448, 17668.8, 0, 209152, 64383, 699072, 65796.8,
> 86016, 85142.6, 4038, 31.049, 24.71, 55.759
> 17:09:19, 32256, 32576, 18938.8, 0, 224512, 43783.8, 699072,
> 73448.4, 86016, 84862.6, 4146, 32.986, 30.05, 63.035
> 17:12:59, 54208, 52608, 0, 36976.4, 224640, 76931.5, 699072,
> 63084.4, 86016, 85367, 4221, 34.258, 33.295, 67.553
> 17:16:21, 45632, 45760, 26864.6, 0, 224512, 158991.5, 699072,
> 60327,
> 86016, 85273.6, 4356, 37.225, 35.458, 72.683
> 17:24:47, 29120, 30016, 0, 14856.2, 274944, 103582.1, 697344,
> 57937.4, 86016, 85176.8, 4525, 40.282, 40.071, 80.352
> 17:33:57, 32832, 34688, 25448.2, 0, 250560, 19438.8, 695808, 55692,
> 86016, 85489.8, 4686, 44.335, 44.935, 89.27
> 17:44:33, 29952, 28672, 0, 22952.2, 280896, 175914.9, 696512,
> 85648.5, 86016, 85940.8, 4845, 47.238, 47.198, 94.436
>
>
> thanks..
>
>
> --------------------------------------
> 2010 FIFA World Cup News [Yahoo!Sports/sportsnavi]
> http://pr.mail.yahoo.co.jp/southafrica2010/
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>