JVM doing many Full GC and Unloading class sun.reflect.GeneratedMethodAccessor
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From: Krist on 22 Feb 2010 18:11 Dear all, I capture at a time (once in 4 day ) that the JVM doing many GCs but not many memory is freed. at the same time in the JVM log there are many : [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1251] [Unloading class sun.reflect.GeneratedMethodAccessor3722] --> attached below. Is this the sign of memory "Packrating" or xms too high ? Thank you for your help, Krist JVM.log : [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1252] [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1253] [Unloading class sun.reflect.GeneratedConstructorAccessor1184] [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1247] [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1251] [Unloading class sun.reflect.GeneratedMethodAccessor3722] GC.log : 344566.250: [CMS-concurrent-mark-start] 344566.499: [GC 344566.500: [ParNew: 42432K->42432K(42496K), 0.0000290 secs] 3140417K->3140417K(3145664K), 0.0001670 secs] 344566.500: [Full GC 344566.500: [CMS344577.409: [CMS-concurrent-mark: 11.154/11.159 secs] (concurrent mode failure): 3097985K->3100302K(3103168K), 31.3653610 secs] 3140417K->3100302K(3145664K), [CMS Perm : 140499K- >140269K(236664K)], 31.3656150 secs] 344598.108: [GC 344598.108: [ParNew: 42432K->42432K(42496K), 0.0000310 secs]344598.108: [CMS (concurrent mode failure): 3100302K- >3101805K(3103168K), 20.1974810 secs] 3142734K->3101805K(3145664K), 20.1979000 secs] 344618.334: [GC [1 CMS-initial-mark: 3101805K(3103168K)] 3102287K(3145664K), 0.0329440 secs] 344618.367: [CMS-concurrent-mark-start] 344618.626: [GC 344618.627: [ParNew: 42432K->42432K(42496K), 0.0000310 secs]344618.627: [CMS344629.578: [CMS-concurrent-mark: 11.154/11.210 secs] (concurrent mode failure): 3101805K->3103167K(3103168K), 31.1795780 secs] 3144237K->3104721K(3145664K), 31.1800010 secs] 344650.043: [Full GC 344650.044: [CMS (concurrent mode failure): 3103167K->3103168K(3103168K), 19.7124490 secs] 3145599K- >3105877K(3145664K), [CMS Perm : 140397K->140381K(236664K)], 19.7129010 secs] 344669.761: [GC [1 CMS-initial-mark: 3103168K(3103168K)] 3106506K(3145664K), 0.0349030 secs] 344669.796: [CMS-concurrent-mark-start] 344670.023: [Full GC 344670.023: [CMS344680.945: [CMS-concurrent-mark: 11.145/11.149 secs] (concurrent mode failure): 3103168K->3103167K(3103168K), 30.6088420 secs] 3145605K->3107683K(3145664K), [CMS Perm : 140396K- >140363K(236664K)], 30.6091590 secs] 344700.914: [Full GC 344700.915: [CMS (concurrent mode failure): 3103167K->3103167K(3103168K), 20.3730500 secs] 3145663K- >3108336K(3145664K), [CMS Perm : 140469K->140454K(236664K)], 20.3734200 secs] 344721.314: [GC [1 CMS-initial-mark: 3103167K(3103168K)] 3108391K(3145664K), 0.0361640 secs] 344721.350: [CMS-concurrent-mark-start] 344721.597: [Full GC 344721.597: [CMS344732.460: [CMS-concurrent-mark: 11.034/11.110 secs] (concurrent mode failure): 3103167K->3103167K(3103168K), 30.8551920 secs] 3145662K->3107077K(3145664K), [CMS Perm : 140471K- >140463K(236664K)], 30.8555580 secs] 344752.749: [Full GC 344752.749: [CMS (concurrent mode failure): 3103167K->3103166K(3103168K), 20.0896130 secs] 3145598K- >3109853K(3145664K), [CMS Perm : 140538K->140503K(236664K)], 20.0900180 secs] 344772.863: [GC [1 CMS-initial-mark: 3103166K(3103168K)] 3111008K(3145664K), 0.0419470 secs] 344772.905: [CMS-concurrent-mark-start] 344773.178: [Full GC 344773.179: [CMS344783.850: [CMS-concurrent-mark: 10.914/10.945 secs] (concurrent mode failure): 3103166K->3103167K(3103168K), 30.7550350 secs] 3145532K->3113053K(3145664K), [CMS Perm : 140516K- >140509K(236664K)], 30.7554280 secs] 344804.173: [Full GC 344804.173: [CMS (concurrent mode failure): 3103167K->3103167K(3103168K), 19.9427320 secs] 3145637K- >3114318K(3145664K), [CMS Perm : 140528K->140475K(236664K)], 19.9431310 secs] 344824.171: [GC [1 CMS-initial-mark: 3103167K(3103168K)] 3116833K(3145664K), 0.0666290 secs] 344824.238: [CMS-concurrent-mark-start] 344824.440: [Full GC 344824.440: [CMS344835.249: [CMS-concurrent-mark: 10.990/11.011 secs] (concurrent mode failure): 3103168K->3103168K(3103168K), 31.2363320 secs] 3145663K->3115988K(3145664K), [CMS Perm : 140503K- >140488K(236664K)], 31.2366980 secs] 344855.901: [Full GC 344855.901: [CMS (concurrent mode failure): 3103168K->3103167K(3103168K), 20.4012740 secs] 3145663K- >3117588K(3145664K), [CMS Perm : 140557K->140540K(236664K)], 20.4016670 secs] 344876.353: [GC [1 CMS-initial-mark: 3103167K(3103168K)] 3120939K(3145664K), 0.0545120 secs] 344876.408: [CMS-concurrent-mark-start] 344876.603: [Full GC 344876.604: [CMS344887.647: [CMS-concurrent-mark: 11.179/11.239 secs] (concurrent mode failure): 3103167K->3103167K(3103168K), 31.0087960 secs] 3145663K->3116993K(3145664K), [CMS Perm : 140571K- >140568K(236664K)], 31.0091440 secs] 344907.799: [Full GC 344907.799: [CMS (concurrent mode failure): 3103168K->3103167K(3103168K), 20.5529780 secs] 3145663K- >3116842K(3145664K), [CMS Perm : 140578K->140481K(236664K)], 20.5533590 secs] 344928.380: [GC [1 CMS-initial-mark: 3103167K(3103168K)] 3117258K(3145664K), 0.0511720 secs] 344928.431: [CMS-concurrent-mark-start] 344928.730: [Full GC 344928.730: [CMS344939.698: [CMS-concurrent-mark: 11.211/11.266 secs] (concurrent mode failure): 3103167K->3103167K(3103168K), 31.8365980 secs] 3145663K->3114429K(3145664K), [CMS Perm : 140509K- >140501K(236664K)], 31.8369960 secs] 344960.944: [Full GC 344960.944: [CMS (concurrent mode failure): 3103168K->3103167K(3103168K), 20.9283530 secs] 3145663K- >3116598K(3145664K), [CMS Perm : 140540K->140515K(236664K)], 20.9287440 secs] 344981.876: [GC [1 CMS-initial-mark: 3103167K(3103168K)] 3116884K(3145664K), 0.0519870 secs] 344981.928: [CMS-concurrent-mark-start] 344982.269: [Full GC 344982.269: [CMS344993.533: [CMS-concurrent-mark: 11.581/11.605 secs] (concurrent mode failure): 3103167K->3103167K(3103168K), 32.3792830 secs] 3145663K->3121032K(3145664K), [CMS Perm : 140557K- >140550K(236664K)], 32.3796180 secs] 345014.908: [Full GC 345014.908: [CMS (concurrent mode failure): 3103167K->3103167K(3103168K), 20.6786370 secs] 3145612K- >3125074K(3145664K), [CMS Perm : 140616K->140524K(236664K)], 20.6789900 secs] 345035.591: [GC [1 CMS-initial-mark: 3103167K(3103168K)] 3125587K(3145664K), 0.0626980 secs] 345035.654: [CMS-concurrent-mark-start] 345035.794: [Full GC 345035.794: [CMS345046.811: [CMS-concurrent-mark: 11.109/11.157 secs] (concurrent mode failure): 3103167K->3103167K(3103168K), 32.2381300 secs] 3145621K->3127389K(3145664K), [CMS Perm : 140556K- >140363K(236664K)], 32.2384530 secs] 345068.162: [Full GC 345068.163: [CMS (concurrent mode failure): 3103167K->3103167K(3103168K), 21.1240030 secs] 3145663K- >3126363K(3145664K), [CMS Perm : 140521K->140481K(236664K)], 21.1243960 secs] 345089.312: [GC [1 CMS-initial-mark: 3103167K(3103168K)] 3129288K(3145664K), 0.0730130 secs] 345089.386: [CMS-concurrent-mark-start] 345089.485: [Full GC 345089.485: [CMS345100.576: [CMS-concurrent-mark: 11.173/11.191 secs] (concurrent mode failure): 3103167K->3103167K(3103168K), 31.6913890 secs] 3145642K->3125339K(3145664K), [CMS Perm : 140531K- >140407K(236664K)], 31.6917280 secs] 345121.300: [Full GC 345121.300: [CMS (concurrent mode failure): 3103167K->3103168K(3103168K), 20.5113870 secs] 3145629K- >3126448K(3145664K), [CMS Perm : 140469K->140454K(236664K)], 20.5117720 secs] 345141.815: [GC [1 CMS-initial-mark: 3103168K(3103168K)] 3126720K(3145664K), 0.0642700 secs] 345141.879: [CMS-concurrent-mark-start] 345142.020: [Full GC 345142.020: [CMS345152.929: [CMS-concurrent-mark: 11.014/11.049 secs] (concurrent mode failure): 3103168K->3103168K(3103168K), 31.8154670 secs] 3145603K->3126736K(3145664K), [CMS Perm : 140480K- >140331K(236664K)], 31.8157970 secs] 345173.963: [Full GC 345173.963: [CMS (concurrent mode failure): 3103168K->3103167K(3103168K), 20.0120820 secs] 3145610K- >3128412K(3145664K), [CMS Perm : 140451K->140410K(236664K)], 20.0125430 secs] 345194.009: [GC [1 CMS-initial-mark: 3103167K(3103168K)] 3133266K(3145664K), 0.0813220 secs] 345194.091: [CMS-concurrent-mark-start] 345194.171: [Full GC 345194.171: [CMS345205.176: [CMS-concurrent-mark: 11.083/11.085 secs] (concurrent mode failure): 3103167K->3103168K(3103168K), 31.2140540 secs] 3145613K->3130283K(3145664K), [CMS Perm : 140439K- >140404K(236664K)], 31.2144210 secs] 345225.486: [Full GC 345225.487: [CMS (concurrent mode failure): 3103168K->3103168K(3103168K), 20.6194420 secs] 3145600K- >3131636K(3145664K), [CMS Perm : 140414K->140389K(236664K)], 20.6198120 secs] 345246.114: [GC [1 CMS-initial-mark: 3103168K(3103168K)] 3132350K(3145664K), 0.0743080 secs] 345246.189: [CMS-concurrent-mark-start] 345246.283: [Full GC 345246.284: [CMS345256.899: [CMS-concurrent-mark: 10.692/10.710 secs] (concurrent mode failure): 3103168K->3046883K(3103168K), 31.2363930 secs] 3145633K->3046883K(3145664K), [CMS Perm : 140421K- >140399K(236664K)], 31.2367380 secs] 345277.845: [GC 345277.845: [ParNew: 42432K->0K(42496K), 0.0508650 secs] 3089315K->3051537K(3145664K), 0.0512270 secs] 345277.897: [GC [1 CMS-initial-mark: 3051537K(3103168K)] 3051564K(3145664K), 0.0314930 secs] 345277.930: [CMS-concurrent-mark-start] 345278.205: [GC 345278.206: [ParNew: 42432K->0K(42496K), 0.0518440 secs] 3093969K->3055914K(3145664K), 0.0522580 secs] 345278.813: [GC 345278.813: [ParNew: 42432K->0K(42496K), 0.0596790 secs] 3098346K->3063103K(3145664K), 0.0600040 secs] 345279.566: [GC 345279.566: [ParNew: 42409K->0K(42496K), 0.0665200 secs] 3105512K->3072809K(3145664K), 0.0668730 secs] 345280.197: [GC 345280.198: [ParNew: 42432K->0K(42496K), 0.0648750 secs] 3115241K->3081774K(3145664K), 0.0651970 secs] 345280.889: [GC 345280.889: [ParNew: 42432K->0K(42496K), 0.0661010 secs] 3124206K->3091567K(3145664K), 0.0664110 secs] 345281.351: [GC 345281.351: [ParNew: 42432K->42432K(42496K), 0.0000280 secs]345281.351: [CMS345290.850: [CMS-concurrent-mark: 12.534/12.920 secs] (concurrent mode failure): 3091567K->3050788K(3103168K), 30.2347230 secs] 3133999K->3050788K(3145664K), 30.2351020 secs] 345311.993: [GC 345311.993: [ParNew: 42432K->0K(42496K), 0.0504710 secs] 3093220K->3059119K(3145664K), 0.0508010 secs] 345312.044: [GC [1 CMS-initial-mark: 3059119K(3103168K)] 3059204K(3145664K), 0.0275030 secs] 345312.072: [CMS-concurrent-mark-start] 345312.744: [GC 345312.744: [ParNew: 42432K->0K(42496K), 0.0629840 secs] 3101551K->3067399K(3145664K), 0.0633320 secs] 345313.699: [GC 345313.699: [ParNew: 42432K->0K(42496K), 0.0806150 secs] 3109831K->3074975K(3145664K), 0.0811060 secs] 345314.719: [GC 345314.719: [ParNew: 42432K->0K(42496K), 0.0697270 secs] 3117407K->3081951K(3145664K), 0.0701740 secs] 345315.575: [GC 345315.575: [ParNew: 42432K->0K(42496K), 0.0657330 secs] 3124383K->3089675K(3145664K), 0.0661450 secs] 345316.484: [GC 345316.484: [ParNew (promotion failed): 42432K- >42432K(42496K), 0.4772870 secs]345316.962: [CMS345325.822: [CMS- concurrent-mark: 12.956/13.750 secs] (concurrent mode failure): 3095821K->3083303K(3103168K), 29.1067870 secs] 3132107K->3083303K(3145664K), 29.5845320 secs] 345346.336: [GC 345346.336: [ParNew: 42432K->0K(42496K), 0.0442050 secs] 3125735K->3089342K(3145664K), 0.0445020 secs] 345346.386: [GC [1 CMS-initial-mark: 3089342K(3103168K)] 3090337K(3145664K), 0.0296060 secs] 345346.415: [CMS-concurrent-mark-start] 345346.720: [GC 345346.720: [ParNew: 42432K->0K(42496K), 0.0508530 secs] 3131774K->3094000K(3145664K), 0.0511760 secs] 345347.096: [GC 345347.096: [ParNew: 42432K->42432K(42496K), 0.0000290 secs]345347.096: [CMS345357.858: [CMS-concurrent-mark: 11.343/11.443 secs] (concurrent mode failure): 3094000K->3089929K(3103168K), 31.2258430 secs] 3136432K->3089929K(3145664K), 31.2262780 secs] 345378.623: [GC 345378.623: [ParNew: 42432K->0K(42496K), 0.0678070 secs] 3132361K->3095863K(3145664K), 0.0682430 secs] 345378.698: [GC [1 CMS-initial-mark: 3095863K(3103168K)] 3096280K(3145664K), 0.0322090 secs] 345378.731: [CMS-concurrent-mark-start] 345379.058: [GC 345379.058: [ParNew: 42432K->42432K(42496K), 0.0000430 secs] 3138295K->3138295K(3145664K), 0.0003010 secs] 345379.059: [Full GC 345379.059: [CMS345390.296: [CMS-concurrent-mark: 11.560/11.565 secs] (concurrent mode failure): 3095863K->3096129K(3103168K), 34.3560840 secs] 3138295K->3096129K(3145664K), [CMS Perm : 140712K- >140279K(236664K)], 34.3563830 secs] 345413.760: [GC 345413.760: [ParNew: 42371K->42371K(42496K), 0.0000380 secs]345413.760: [CMS (concurrent mode failure): 3096129K- >3097584K(3103168K), 22.0514310 secs] 3138500K->3097584K(3145664K), 22.0518920 secs] 345435.853: [GC [1 CMS-initial-mark: 3097584K(3103168K)] 3101013K(3145664K), 0.0493630 secs] 345435.903: [CMS-concurrent-mark-start] 345436.212: [GC 345436.213: [ParNew: 42432K->42432K(42496K), 0.0000340 secs]345436.213: [CMS345447.658: [CMS-concurrent-mark: 11.704/11.755 secs] (concurrent mode failure): 3097584K->3099328K(3103168K), 34.1080900 secs] 3140016K->3099328K(3145664K), 34.1085640 secs] 345470.632: [GC 345470.632: [ParNew: 42432K->42432K(42496K), 0.0000310 secs]345470.632: [CMS (concurrent mode failure): 3099328K- >3101851K(3103168K), 21.9869300 secs] 3141760K->3101851K(3145664K), 21.9873860 secs] 345492.668: [GC [1 CMS-initial-mark: 3101851K(3103168K)] 3102867K(3145664K), 0.0357960 secs] 345492.742: [CMS-concurrent-mark-start] 345493.023: [GC 345493.023: [ParNew: 42432K->42432K(42496K), 0.0000310 secs]345493.024: [CMS345503.911: [CMS-concurrent-mark: 11.094/11.168 secs] (concurrent mode failure): 3101851K->3103167K(3103168K), 30.4600780 secs] 3144283K->3104348K(3145664K), 30.4605060 secs] 345523.776: [Full GC 345523.776: [CMS (concurrent mode failure): 3103167K->3103167K(3103168K), 20.3950420 secs] 3145599K- >3105427K(3145664K), [CMS Perm : 140414K->140408K(236664K)], 20.3954650 secs] 345544.211: [GC [1 CMS-initial-mark: 3103167K(3103168K)] 3105795K(3145664K), 0.0333460 secs] 345544.244: [CMS-concurrent-mark-start] 345544.612: [Full GC 345544.613: [CMS345556.049: [CMS-concurrent-mark: 11.736/11.805 secs] (concurrent mode failure): 3103167K->3103168K(3103168K), 31.6433490 secs] 3145527K->3107083K(3145664K), [CMS Perm : 140456K- >140432K(236664K)], 31.6437460 secs] 345576.544: [Full GC 345576.545: [CMS (concurrent mode failure): 3103168K->3103167K(3103168K), 21.8245040 secs] 3145663K- >3109578K(3145664K), [CMS Perm : 140542K->140531K(236664K)], 21.8249060 secs] 345598.435: [GC [1 CMS-initial-mark: 3103167K(3103168K)] 3113423K(3145664K), 0.0551620 secs] 345598.491: [CMS-concurrent-mark-start] 345598.936: [Full GC 345598.936: [CMS345610.823: [CMS-concurrent-mark: 12.275/12.333 secs] (concurrent mode failure): 3103167K->3103168K(3103168K), 35.3387090 secs] 3145663K->3107955K(3145664K), [CMS Perm : 140563K- >140529K(236664K)], 35.3390630 secs] 345634.786: [Full GC 345634.787: [CMS
From: Roedy Green on 22 Feb 2010 22:31 On Mon, 22 Feb 2010 15:11:15 -0800 (PST), Krist <krislioe(a)gmail.com> wrote, quoted or indirectly quoted someone who said : >[Unloading class sun.reflect.GeneratedConstructorAccessor1184] I would hazard a guess this is some class that lets the deserialization process create objects using some standard interface. It would be generated code that handles the details. Most likely you should just ignore this. -- Roedy Green Canadian Mind Products http://mindprod.com Imagine an architect who would never admit to making sketches, blueprints or erecting scaffolds. In his view, the finished building speaks for itself. How could a young architect learn from such a man? Mathematicians traditionally refuse ever to disclose the intuitions that lead them to a conjecture, or the empirical tests to see if it were likely true, or the initial proofs. They are like chefs who refuse to disclose their recipes, ingredients or techniques.
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