Full GC even when Max Heap is more than enough
Hi,
I have searched through the forum and I still cannot find something that is specific to this. Maybe I have misread or misunderstood so I am posting to see if anyone has a better insight.
Currently we have a JVM running in production and after some time, it will run a Full GC about every minute. There are plenty of heap size allocated (16GB) but it never get around to that number.
Below are the JVM settings and part of in the log where the Full GCs keep occurring.
JVM Settings:
java.extended.properties=-server -XX:+UseParallelGC -XX:ParallelGCThreads=8 -XX:NewRatio=1 -Xloggc:<filename_including_path> -XX:+PrintGCDetails -XX:+PrintGCTimeStamps
Log:
Prior to this, there have been normal GC and no Full GC.
8008.860: [GC [PSYoungGen: 80490K->3128K(201536K)] 598949K->524407K(1599680K), 0.0100450 secs]
8008.870: [Full GC [PSYoungGen: 3128K->0K(201536K)] [PSOldGen: 521278K->168262K(1398144K)] 524407K->168262K(1599680K) [PSPermGen: 48726K->48726K(48896K)], 0.9232270 secs]
8016.336: [GC [PSYoungGen: 198400K->1572K(198784K)] 366662K->169834K(1596928K), 0.0077210 secs]
8017.353: [GC [PSYoungGen: 198756K->1696K(198784K)] 367018K->170486K(1596928K), 0.0079480 secs]
8018.315: [GC [PSYoungGen: 197650K->1533K(196352K)] 366440K->170427K(1594496K), 0.0066220 secs]
8021.174: [GC [PSYoungGen: 196349K->733K(196544K)] 365243K->169819K(1594688K), 0.0058580 secs]
8026.985: [GC [PSYoungGen: 194397K->2018K(194560K)] 363483K->171282K(1592704K), 0.0055860 secs]
8027.982: [GC [PSYoungGen: 194530K->2464K(194240K)] 363794K->172613K(1592384K), 0.0071310 secs]
8029.121: [GC [PSYoungGen: 193824K->3967K(194240K)] 363973K->189987K(1592384K), 0.0125690 secs]
8029.753: [GC [PSYoungGen: 194239K->5636K(198592K)] 380259K->193888K(1596736K), 0.0126180 secs]
8030.945: [GC [PSYoungGen: 194555K->7823K(195968K)] 382807K->196768K(1594112K), 0.0086320 secs]
8037.747: [GC [PSYoungGen: 195919K->5195K(196544K)] 384864K->194605K(1594688K), 0.0083580 secs]
8038.561: [GC [PSYoungGen: 192203K->2858K(188800K)] 381613K->196308K(1586944K), 0.0089920 secs]
8039.445: [GC [PSYoungGen: 188778K->1536K(193984K)] 382228K->195431K(1592128K), 0.0062260 secs]
8041.325: [GC [PSYoungGen: 186368K->1201K(185024K)] 380263K->195310K(1583168K), 0.0055030 secs]
8046.393: [GC [PSYoungGen: 185009K->1091K(191552K)] 379118K->195810K(1589696K), 0.0069350 secs]
8049.140: [GC [PSYoungGen: 183875K->1884K(183680K)] 378594K->197150K(1581824K), 0.0086420 secs]
8050.023: [GC [PSYoungGen: 183644K->2336K(188352K)] 378910K->198290K(1586496K), 0.0075260 secs]
8050.883: [GC [PSYoungGen: 183072K->760K(180480K)] 379026K->196847K(1578624K), 0.0063370 secs]
8055.104: [GC [PSYoungGen: 180472K->653K(186304K)] 376559K->197021K(1584448K), 0.0059920 secs]
8060.021: [GC [PSYoungGen: 179405K->1824K(179648K)] 375773K->198383K(1577792K), 0.0062650 secs]
8060.824: [GC [PSYoungGen: 179616K->1728K(183232K)] 376175K->198716K(1581376K), 0.0055290 secs]
8062.169: [GC [PSYoungGen: 178560K->896K(176768K)] 375548K->197960K(1574912K), 0.0056060 secs]
8063.377: [GC [PSYoungGen: 176768K->597K(181120K)] 373832K->197864K(1579264K), 0.0079390 secs]
8068.465: [GC [PSYoungGen: 175509K->2509K(176512K)] 372776K->200014K(1574656K), 0.0052340 secs]
8069.802: [GC [PSYoungGen: 47592K->482K(180544K)] 245096K->198601K(1578688K), 0.0058060 secs]
8069.808: [Full GC [PSYoungGen: 482K->0K(180544K)] [PSOldGen: 198118K->169154K(1398144K)] 198601K->169154K(1578688K) [PSPermGen: 50863K->50863K(86016K)], 0.6434610 secs]
8071.821: [GC [PSYoungGen: 173952K->2464K(175488K)] 343106K->171619K(1573632K), 0.0071720 secs]
8072.577: [GC [PSYoungGen: 175456K->1162K(177152K)] 344611K->170547K(1575296K), 0.0059360 secs]
8073.323: [GC [PSYoungGen: 173258K->1440K(172672K)] 342643K->171187K(1570816K), 0.0058680 secs]
8077.257: [GC [PSYoungGen: 172640K->672K(174912K)] 342387K->170614K(1573056K), 0.0052860 secs]
8083.703: [GC [PSYoungGen: 170976K->1706K(171136K)] 340918K->171817K(1569280K), 0.0047670 secs]
8084.518: [GC [PSYoungGen: 171114K->2400K(172672K)] 341225K->173057K(1570816K), 0.0070080 secs]
8085.335: [GC [PSYoungGen: 170912K->1504K(169152K)] 341569K->172760K(1567296K), 0.0047610 secs]
8090.280: [GC [PSYoungGen: 169120K->704K(170496K)] 340376K->172151K(1568640K), 0.0066940 secs]
8094.745: [GC [PSYoungGen: 167424K->1312K(167232K)] 338871K->173002K(1565376K), 0.0064510 secs]
8095.480: [GC [PSYoungGen: 167200K->2016K(168512K)] 338890K->173955K(1566656K), 0.0034560 secs]
8096.580: [GC [PSYoungGen: 167072K->864K(165120K)] 339011K->172939K(1563264K), 0.0062540 secs]
8098.771: [GC [PSYoungGen: 165088K->667K(166592K)] 337163K->172963K(1564736K), 0.0042480 secs]
8105.528: [GC [PSYoungGen: 164059K->1425K(164032K)] 336355K->174009K(1562176K), 0.0043110 secs]
8106.532: [GC [PSYoungGen: 163985K->3047K(165504K)] 336569K->176177K(1563648K), 0.0058110 secs]
8107.305: [GC [PSYoungGen: 164775K->2560K(163456K)] 337905K->176491K(1561600K), 0.0060040 secs]
8108.011: [GC [PSYoungGen: 163456K->2228K(163584K)] 337387K->176346K(1561728K), 0.0056100 secs]
8111.550: [GC [PSYoungGen: 162356K->932K(160320K)] 336474K->175304K(1558464K), 0.0061080 secs]
8116.379: [GC [PSYoungGen: 160292K->1920K(161600K)] 334664K->176740K(1559744K), 0.0048300 secs]
8117.094: [GC [PSYoungGen: 160512K->2821K(160704K)] 335332K->178210K(1558848K), 0.0060000 secs]
8117.782: [GC [PSYoungGen: 160645K->1580K(160064K)] 336034K->177700K(1558208K), 0.0053460 secs]
8118.328: [GC [PSYoungGen: 158636K->1819K(158144K)] 334756K->178403K(1556288K), 0.0071820 secs]
8121.513: [GC [PSYoungGen: 158052K->3745K(159296K)] 334637K->180761K(1557440K), 0.0074850 secs]
8127.213: [GC [PSYoungGen: 159265K->2056K(156864K)] 336281K->179362K(1555008K), 0.0063830 secs]
8127.986: [GC [PSYoungGen: 156808K->2072K(157056K)] 334114K->180479K(1555200K), 0.0047890 secs]
8128.563: [GC [PSYoungGen: 156056K->1536K(154816K)] 334463K->180242K(1552960K), 0.0063460 secs]
8129.491: [GC [PSYoungGen: 154816K->661K(155904K)] 333522K->179586K(1554048K), 0.0045530 secs]
8130.461: [GC [PSYoungGen: 36243K->320K(156544K)] 215168K->179612K(1554688K), 0.0057870 secs]
8130.467: [Full GC [PSYoungGen: 320K->0K(156544K)] [PSOldGen: 179292K->169917K(1398144K)] 179612K->169917K(1554688K) [PSPermGen: 50866K->50866K(86016K)], 0.6929110 secs]
8138.407: [GC [PSYoungGen: 152576K->1440K(154816K)] 322493K->171357K(1552960K), 0.0063690 secs]
The pattern repeats itself...
Adrian
Are you using RMI? Have you adjusted sun.rmi.dgc.server.gcInterval and sun.rmi.dgc.client.gcInterval from their default values for calling System.gc()? I gather (from the format of your logs) that you are running an older JVM, where the default RMI GC intervals were 60000 milliseconds (1 minute). In later JVM's, the default RMI GC interval was increased to 1 hour. See the [JavaTM RMI Release Notes for JDK 6|http://java.sun.com/javase/6/docs/technotes/guides/rmi/relnotes.html] for some details on this.
Otherwise you might be using some third party code that calls System.gc() periodically. A later JVM will show "(System)" in the full GC output for collections that were caused by a call to System.gc(). You can effectively disable that behavior with the -XX:+DisableExplicitGC command line option, though that might have bad effects on your application if the third party code needed those full collections. But it would be diagnostic.
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Attached file Actual output from source code.doc : This report generated from the source code. Here table row header "Test Case Number and Test Step Number" is not repeated in second page.
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