CMS Garbage collection eating up processor power
T.K
thankhar at gmail.com
Fri Mar 28 03:19:20 UTC 2008
I've attached an old gclog where it has similar behavior on the heap. But
the problem with that is it takes quite a long time, like 20 - 70 seconds.
The server basically went down with customers complaining during that time,
so we had to try CMS, but that doesn't work out well either.
We are having Sun Portal Server 6.2 on those web servers. Do you know is it
a normal behavior for Portal Server with about 400-500 users per instance?
Thanks,
TK
On Thu, Mar 27, 2008 at 5:10 PM, Jon Masamitsu <Jon.Masamitsu at sun.com>
wrote:
> Late in this log I see
>
> 162417.510: [GC 162417.510: [ParNew: 370176K->11520K(381696K), 0.4232456
> secs] 3055096K->2715938K(3134208K), 0.4240171 secs]
>
> At that point the heap is about 85% full (2715938K/3134208K). The
> tenured generation is almost completely full.
>
> Do you have similar logs when using the default GC? We could use them
> to verify the amount of live data.
>
>
> T.K wrote:
> >
> > Hi Jon,
> >
> > Here's the attached gclog. It starts out fine when we put in the change
> > in the evening. Eventually, the next morning (around 60000 seconds on
> > gc time) when the load starting to get in, CMS starts to run
> > consectively. The first CMS fails occur when we bump up the users to
> > 700+, and almost kill the server. Ever since then, I don't see the CMS
> > ever stops, even when the load goes down to 50 users.
> >
> > I cut off the logs in between into 3 portion so that I can attach it.
> :D
> >
> >
> > Thanks,
> > TK
> >
> >
> > On 3/27/08, *Jon Masamitsu* <Jon.Masamitsu at sun.com
> > <mailto:Jon.Masamitsu at sun.com>> wrote:
> >
> > Using CMS sometimes needs some tuning (especially
> > with the 1.4.2 jdk). Do you have any gc logs
> > (-XX:+PrintGCDetails) so we can see what's happening?
> >
> >
> > T.K wrote:
> > > Hi All,
> > > We got 5 Sun Web Servers running on Java 1.4.2, and used to use
> the
> > > default GC for Tenured space. The problem with that is that it
> takes
> > > 60-80 seconds everytime the GC happens, and the latency on the
> > site goes
> > > crazy. So we decided to change it to use the Concurrent Mark
> Sweep
> > > Collector on one server to test it out. Here's the setting:
> > >
> > > -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -Xms3G -Xmx3G
> > -XX:NewSize=384M
> > > -XX:MaxNewSize=384M -XX:PermSize=64M -XX:MaxPermSize=64M
> > > -XX:CMSInitiatingOccupancyFraction=60
> > >
> > > With that setting, the server runs great. But eventually, when
> the
> > > server reach a medium load (around 100-200 users), the tenured
> > space is
> > > always around half full, and the CMS collector starts to run
> > > continuously one after another. It doesn't hurt the application
> > for now,
> > > but it's taking 25% of processing time (we got 4 cpu, so one web
> > server
> > > always keep 1 cpu power). I don't see that much cpu utilization
> > on other
> > > web server that don't have CMS, and they have more users than the
> one
> > > with CMS. If we got CMS on all 5 web servers, I'm wondering if
> > that will
> > > crash the server or not. What should I do to decrease the
> processor
> > > utilization caused by GC?
> > >
> > > Also, I'm thinking to use i-CMS on the JVM, and maybe that might
> slow
> > > down the CMS and reduce the amount of CPU utilization by CMS. Any
> > thought?
> > >
> > > Thanks,
> > > TK
> > >
> > >
> > >
> >
> ------------------------------------------------------------------------
> > >
> > > _______________________________________________
> > > hotspot-gc-use mailing list
> > > hotspot-gc-use at openjdk.java.net
> > <mailto:hotspot-gc-use at openjdk.java.net>
> > > http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use
> >
> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > hotspot-gc-use mailing list
> > hotspot-gc-use at openjdk.java.net
> > http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use
>
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142480.180: [GC 142480.180: [ParNew: 381696K->11520K(381696K), 0.1529284 secs] 2653435K->2299715K(3134208K), 0.1531900 secs]
142520.257: [GC 142520.257: [ParNew: 381696K->11520K(381696K), 0.1520422 secs] 2669891K->2323509K(3134208K), 0.1523231 secs]
142555.090: [GC 142555.090: [ParNew: 381696K->11520K(381696K), 0.1657331 secs] 2693685K->2346340K(3134208K), 0.1660064 secs]
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142639.531: [GC 142639.531: [ParNew: 381695K->11520K(381696K), 0.1938166 secs] 2741222K->2407459K(3134208K), 0.1940910 secs]
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142802.432: [GC 142802.433: [ParNew: 381696K->11520K(381696K), 0.1335766 secs] 2616542K->2264103K(3134208K), 0.1338476 secs]
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142974.690: [GC 142974.690: [ParNew: 381695K->11519K(381696K), 0.1664869 secs] 2744067K->2399032K(3134208K), 0.1667732 secs]
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148271.912: [GC 148271.912: [ParNew: 370176K->370176K(381696K), 0.0000419 secs]148271.912: [Tenured: 2403202K->2408101K(2752512K), 20.3311772 secs] 2773378K->2408101K(3134208K), 20.3316201 secs]
148320.099: [GC 148320.100: [ParNew: 370176K->370176K(381696K), 0.0000440 secs]148320.100: [Tenured: 2408101K->2408058K(2752512K), 23.3339353 secs] 2778277K->2408058K(3134208K), 23.3343595 secs]
148352.773: [GC 148352.773: [ParNew: 370176K->370176K(381696K), 0.0000510 secs]148352.773: [Tenured: 2408058K->2415864K(2752512K), 20.3580828 secs] 2778234K->2415864K(3134208K), 20.3585702 secs]
148420.546: [GC 148420.546: [ParNew: 370176K->370176K(381696K), 0.0000528 secs]148420.546: [Tenured: 2415864K->2398794K(2752512K), 27.9457147 secs] 2786040K->2398794K(3134208K), 27.9462588 secs]
148463.918: [GC 148463.919: [ParNew: 370176K->370176K(381696K), 0.0000442 secs]148463.919: [Tenured: 2398794K->2403892K(2752512K), 26.7522480 secs] 2768970K->2403892K(3134208K), 26.7527022 secs]
148514.524: [GC 148514.524: [ParNew: 370176K->370176K(381696K), 0.0000432 secs]148514.524: [Tenured: 2403892K->2396021K(2752512K), 23.6899298 secs] 2774068K->2396021K(3134208K), 23.6903685 secs]
148560.826: [GC 148560.826: [ParNew: 370176K->370176K(381696K), 0.0000495 secs]148560.826: [Tenured: 2396021K->2407596K(2752512K), 20.7438305 secs] 2766197K->2407596K(3134208K), 20.7443179 secs]
148604.861: [GC 148604.861: [ParNew: 370176K->370176K(381696K), 0.0000434 secs]148604.861: [Tenured: 2407596K->2410656K(2752512K), 23.2184290 secs] 2777772K->2410656K(3134208K), 23.2188362 secs]
148633.553: [GC 148633.553: [ParNew: 370176K->370176K(381696K), 0.0000404 secs]148633.553: [Tenured: 2410656K->2433818K(2752512K), 22.0895719 secs] 2780832K->2433818K(3134208K), 22.0899521 secs]
148661.909: [GC 148661.909: [ParNew: 370176K->370176K(381696K), 0.0000444 secs]148661.909: [Tenured: 2433818K->2401723K(2752512K), 21.9782918 secs] 2803994K->2401723K(3134208K), 21.9787139 secs]
148744.210: [GC 148744.210: [ParNew: 370176K->370176K(381696K), 0.0000457 secs]148744.210: [Tenured: 2401723K->2418113K(2752512K), 21.8948680 secs] 2771899K->2418113K(3134208K), 21.8953128 secs]
148795.392: [GC 148795.392: [ParNew: 370176K->370176K(381696K), 0.0000405 secs]148795.392: [Tenured: 2418113K->2395958K(2752512K), 20.1755476 secs] 2788289K->2395958K(3134208K), 20.1759605 secs]
148820.809: [GC 148820.809: [ParNew: 370176K->370176K(381696K), 0.0000412 secs]148820.810: [Tenured: 2395958K->2398696K(2752512K), 21.6848333 secs] 2766134K->2398696K(3134208K), 21.6851879 secs]
148857.805: [GC 148857.806: [ParNew: 370176K->370176K(381696K), 0.0000425 secs]148857.806: [Tenured: 2398696K->2385563K(2752512K), 23.4604846 secs] 2768872K->2385563K(3134208K), 23.4609437 secs]
148887.236: [GC 148887.236: [ParNew: 370176K->370176K(381696K), 0.0000402 secs]148887.236: [Tenured: 2385563K->2390077K(2752512K), 21.1798263 secs] 2755739K->2390077K(3134208K), 21.1802359 secs]
148942.960: [GC 148942.960: [ParNew: 370176K->370176K(381696K), 0.0000468 secs]148942.960: [Tenured: 2390077K->2407994K(2752512K), 20.4638100 secs] 2760253K->2407994K(3134208K), 20.4642784 secs]
148984.017: [GC 148984.017: [ParNew: 370176K->370176K(381696K), 0.0002491 secs]148984.018: [Tenured: 2407994K->2425668K(2752512K), 22.2685522 secs] 2778170K->2425668K(3134208K), 22.2691985 secs]
149020.400: [GC 149020.400: [ParNew: 370176K->370176K(381696K), 0.0000402 secs]149020.400: [Tenured: 2425668K->2432052K(2752512K), 21.5453321 secs] 2795844K->2432052K(3134208K), 21.5457483 secs]
149070.162: [GC 149070.163: [ParNew: 370176K->370176K(381696K), 0.0000453 secs]149070.163: [Tenured: 2432052K->2447372K(2752512K), 20.1193742 secs] 2802228K->2447372K(3134208K), 20.1198110 secs]
149102.110: [GC 149102.111: [ParNew: 370176K->370176K(381696K), 0.0000417 secs]149102.111: [Tenured: 2447372K->2445595K(2752512K), 21.9428454 secs] 2817548K->2445595K(3134208K), 21.9432777 secs]
149199.323: [GC 149199.324: [ParNew: 370176K->370176K(381696K), 0.0000412 secs]149199.324: [Tenured: 2445595K->2458769K(2752512K), 21.7851154 secs] 2815771K->2458769K(3134208K), 21.7855289 secs]
============================================================================================================================================================================================================
135236.128: [GC 135236.128: [ParNew: 381236K->10940K(381696K), 0.1487499 secs] 2602473K->2240326K(3134208K), 0.1492331 secs]
135242.920: [GC 135242.920: [ParNew: 381116K->11520K(381696K), 0.3883578 secs] 2610502K->2266633K(3134208K), 0.3888688 secs]
135249.471: [GC 135249.471: [ParNew: 381696K->11520K(381696K), 0.5381378 secs] 2636809K->2293215K(3134208K), 0.5386331 secs]
135258.092: [GC 135258.093: [ParNew: 381696K->11520K(381696K), 0.3283106 secs] 2663391K->2312894K(3134208K), 0.3287975 secs]
135265.857: [GC 135265.857: [ParNew: 381696K->11520K(381696K), 0.2115995 secs] 2683070K->2332386K(3134208K), 0.2120674 secs]
135273.319: [GC 135273.320: [ParNew: 381696K->11520K(381696K), 0.1897751 secs] 2702562K->2349053K(3134208K), 0.1902277 secs]
135279.935: [GC 135279.936: [ParNew: 381696K->11520K(381696K), 0.2609155 secs] 2719229K->2366751K(3134208K), 0.2613889 secs]
135287.040: [GC 135287.040: [ParNew: 381696K->11520K(381696K), 0.3951692 secs] 2736927K->2387260K(3134208K), 0.3956783 secs]
135293.620: [GC 135293.620: [ParNew: 381696K->381696K(381696K), 0.0000484 secs]135293.620: [Tenured: 2375740K->2260223K(2752512K), 66.5249753 secs] 2757436K->2260223K(3134208K), 66.5255858 secs]
135365.616: [GC 135365.617: [ParNew: 370176K->11520K(381696K), 0.2210123 secs] 2630399K->2278228K(3134208K), 0.2219016 secs]
135371.224: [GC 135371.224: [ParNew: 381696K->11520K(381696K), 0.2271973 secs] 2648404K->2299409K(3134208K), 0.2276960 secs]
135376.431: [GC 135376.431: [ParNew: 381696K->11520K(381696K), 0.3488670 secs] 2669585K->2332194K(3134208K), 0.3493485 secs]
135401.457: [GC 135401.457: [ParNew: 381696K->11520K(381696K), 0.2897967 secs] 2702370K->2347171K(3134208K), 0.2903811 secs]
135422.970: [GC 135422.970: [ParNew: 381684K->11520K(381696K), 0.2676812 secs] 2717335K->2366546K(3134208K), 0.2681495 secs]
135448.716: [GC 135448.716: [ParNew: 381696K->11520K(381696K), 0.4161650 secs] 2736722K->2378127K(3134208K), 0.4167444 secs]
135467.414: [GC 135467.414: [ParNew: 381696K->11520K(381696K), 0.2503420 secs] 2748303K->2390511K(3134208K), 0.2508314 secs]
135490.134: [GC 135490.134: [ParNew: 381696K->381696K(381696K), 0.0000436 secs]135490.134: [Tenured: 2378991K->2325981K(2752512K), 59.8682506 secs] 2760687K->2325981K(3134208K), 59.8689177 secs]
135568.298: [GC 135568.298: [ParNew: 370176K->11520K(381696K), 0.1882343 secs] 2696157K->2342793K(3134208K), 0.1887585 secs]
135573.326: [GC 135573.326: [ParNew: 381696K->11520K(381696K), 0.2906748 secs] 2712969K->2370478K(3134208K), 0.2911551 secs]
135580.879: [GC 135580.880: [ParNew: 381696K->11520K(381696K), 0.3318975 secs] 2740654K->2394646K(3134208K), 0.3324175 secs]
135620.173: [GC 135620.173: [ParNew: 381696K->381696K(381696K), 0.0000462 secs]135620.174: [Tenured: 2383126K->2351856K(2752512K), 44.9206261 secs] 2764822K->2351856K(3134208K), 44.9213009 secs]
135679.309: [GC 135679.309: [ParNew: 370176K->11520K(381696K), 0.1565943 secs] 2722032K->2365063K(3134208K), 0.1571790 secs]
135699.466: [GC 135699.467: [ParNew: 381696K->11520K(381696K), 0.2607721 secs] 2735239K->2376399K(3134208K), 0.2613328 secs]
135721.939: [GC 135721.940: [ParNew: 381696K->11520K(381696K), 0.3034463 secs] 2746575K->2400476K(3134208K), 0.3038992 secs]
135751.233: [GC 135751.234: [ParNew: 381696K->381696K(381696K), 0.0000511 secs]135751.234: [Tenured: 2388956K->2380338K(2752512K), 78.8009336 secs] 2770652K->2380338K(3134208K), 78.8020177 secs]
135842.009: [GC 135842.010: [ParNew: 370176K->11520K(381696K), 0.1977683 secs] 2750514K->2407973K(3134208K), 0.1983169 secs]
135873.292: [GC 135873.293: [ParNew: 381696K->381696K(381696K), 0.0000453 secs]135873.293: [Tenured: 2396453K->2383302K(2752512K), 64.3606791 secs] 2778149K->2383302K(3134208K), 64.3613710 secs]
135953.279: [GC 135953.280: [ParNew: 370176K->370176K(381696K), 0.0000524 secs]135953.280: [Tenured: 2383302K->2395549K(2752512K), 76.2378528 secs] 2753478K->2395549K(3134208K), 76.2387742 secs]
136053.349: [GC 136053.349: [ParNew: 370176K->370176K(381696K), 0.0000512 secs]136053.349: [Tenured: 2395549K->2405645K(2752512K), 66.2740995 secs] 2765725K->2405645K(3134208K), 66.2748460 secs]
136144.769: [GC 136144.769: [ParNew: 370176K->370176K(381696K), 0.0000509 secs]136144.770: [Tenured: 2405645K->2408224K(2752512K), 94.6006862 secs] 2775821K->2408224K(3134208K), 94.6015698 secs]
136258.555: [GC 136258.556: [ParNew: 370176K->370176K(381696K), 0.0001500 secs]136258.556: [Tenured: 2408224K->2399909K(2752512K), 62.5313810 secs] 2778400K->2399909K(3134208K), 62.5323832 secs]
136340.110: [GC 136340.111: [ParNew: 370176K->370176K(381696K), 0.0000487 secs]136340.111: [Tenured: 2399909K->2418917K(2752512K), 69.0142367 secs] 2770085K->2418917K(3134208K), 69.0149814 secs]
136421.847: [GC 136421.847: [ParNew: 370176K->370176K(381696K), 0.0000507 secs]136421.848: [Tenured: 2418917K->2430469K(2752512K), 53.7454312 secs] 2789093K->2430469K(3134208K), 53.7463140 secs]
136494.090: [GC 136494.090: [ParNew: 370176K->370176K(381696K), 0.0000499 secs]136494.090: [Tenured: 2430469K->2441578K(2752512K), 46.5138496 secs] 2800645K->2441578K(3134208K), 46.5146605 secs]
136548.578: [GC 136548.578: [ParNew: 370176K->370176K(381696K), 0.0000512 secs]136548.578: [Tenured: 2441578K->2430020K(2752512K), 54.5819605 secs] 2811754K->2430020K(3134208K), 54.5827932 secs]
136616.193: [GC 136616.194: [ParNew: 370171K->370171K(381696K), 0.0000514 secs]136616.194: [Tenured: 2430020K->2459549K(2752512K), 48.5289543 secs] 2800191K->2459549K(3134208K), 48.5298699 secs]
136688.024: [GC 136688.025: [ParNew: 370176K->370176K(381696K), 0.0000500 secs]136688.025: [Tenured: 2459549K->2466803K(2752512K), 56.1484971 secs] 2829725K->2466803K(3134208K), 56.1493833 secs]
136784.820: [GC 136784.821: [ParNew: 370176K->370176K(381696K), 0.0000469 secs]136784.821: [Tenured: 2466803K->2439035K(2752512K), 59.7662953 secs] 2836979K->2439035K(3134208K), 59.7670806 secs]
136855.701: [GC 136855.701: [ParNew: 370176K->370176K(381696K), 0.0000494 secs]136855.702: [Tenured: 2439035K->2437479K(2752512K), 60.5713630 secs] 2809211K->2437479K(3134208K), 60.5721540 secs]
136946.992: [GC 136946.993: [ParNew: 370176K->370176K(381696K), 0.0000472 secs]136946.993: [Tenured: 2437479K->2434121K(2752512K), 69.8804932 secs] 2807655K->2434121K(3134208K), 69.8813769 secs]
137053.315: [GC 137053.316: [ParNew: 370176K->370176K(381696K), 0.0000478 secs]137053.316: [Tenured: 2434121K->2429645K(2752512K), 55.8681530 secs] 2804297K->2429645K(3134208K), 55.8690776 secs]
137117.407: [GC 137117.408: [ParNew: 370176K->370176K(381696K), 0.0000457 secs]137117.408: [Tenured: 2429645K->2392281K(2752512K), 60.1395403 secs] 2799821K->2392281K(3134208K), 60.1402508 secs]
137192.832: [GC 137192.833: [ParNew: 370176K->370176K(381696K), 0.0000504 secs]137192.833: [Tenured: 2392281K->2359001K(2752512K), 55.8807364 secs] 2762457K->2359001K(3134208K), 55.8815860 secs]
137269.261: [GC 137269.261: [ParNew: 370176K->11520K(381696K), 0.4315052 secs] 2729177K->2390297K(3134208K), 0.4322472 secs]
137316.690: [GC 137316.691: [ParNew: 381696K->381696K(381696K), 0.0000429 secs]137316.691: [Tenured: 2378777K->2207878K(2752512K), 45.7582930 secs] 2760473K->2207878K(3134208K), 45.7592215 secs]
137504.194: [GC 137504.195: [ParNew: 370176K->11520K(381696K), 0.1260562 secs] 2578054K->2222187K(3134208K), 0.1267394 secs]
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