GC Log - Allocation Failure 해결 질문

Question

tomcat 8.5 / jdk7 기반에서 하나 구축을 했는데요, heap memory를 1G->2G로 늘리니까 catalina.out에 이제 OOM로그는 안나오네요. 그런데 gclog는 변함이 없네요..Allocation Failure 라는게 heap(Eden of Young Generation)에 object를 할당하지 못해서 그런건데 그럼 아직도 메모리 부족이라는 뜻인가요?..------------------------------------------$java optionJAVA_OPTS&#61;&#34;${JAVA_OPTS} -D${INST_NAME} -Xms2048m -Xmx2048m -XX:PermSize&#61;256m -XX:MaxPermSize&#61;256m -verbose:gc -XX:&#43;PrintGCDetails -XX:&#43;PrintGCTimeStamps -XX:&#43;PrintGCDateStamps -Xloggc:${LOG_HOME}/gc_${INST_NAME}.log -XX:&#43;HeapDumpOnOutOfMemoryError &#34;$free -h total used free shared buffers cached Mem: 15G 15G 299M 1.0M 443M 11G -/&#43; buffers/cache: 3.6G 11G Swap: 4.0G 33M 4.0G---------------------------------------------------- -------------------------------------------------- Java HotSpot(TM) 64-Bit Server VM (25.221-b11) for linux-amd64 JRE (1.8.0_221-b11), built on Jul 4 2019 04:27:00 by &#34;java_re&#34; with gcc 7.3.0 Memory: 4k page, physical 16333964k(1765820k free), swap 4194300k(4163736k free) CommandLine flags: -XX:&#43;HeapDumpOnOutOfMemoryError -XX:InitialHeapSize&#61;2147483648 -XX:MaxHeapSize&#61;2147483648 -XX:&#43;PrintGC -XX:&#43;PrintGCDateStamps -XX:&#43;PrintGCDetails -XX:&#43;PrintGCTimeStamps -XX:&#43;UseCompressedClassPointers -XX:&#43;UseCompressedOops -XX:&#43;UseParallelGC 2020-01-05T23:19:49.925&#43;0900: 2.180: [GC (Allocation Failure) [PSYoungGen: 524800K->79073K(611840K)] 524800K->79161K(2010112K), 0.0870770 secs] [Times: user&#61;0.24 sys&#61;0.03, real&#61;0.09 secs] 2020-01-05T23:19:51.457&#43;0900: 3.712: [GC (Allocation Failure) [PSYoungGen: 603873K->87030K(611840K)] 603961K->89687K(2010112K), 0.1392445 secs] [Times: user&#61;0.38 sys&#61;0.03, real&#61;0.14 secs] 2020-01-05T23:19:53.006&#43;0900: 5.261: [GC (Allocation Failure) [PSYoungGen: 611830K->87034K(611840K)] 614487K->97657K(2010112K), 0.0924204 secs] [Times: user&#61;0.17 sys&#61;0.01, real&#61;0.09 secs] 2020-01-05T23:19:54.143&#43;0900: 6.398: [GC (Allocation Failure) [PSYoungGen: 611834K->87022K(611840K)] 622457K->102186K(2010112K), 0.1121908 secs] [Times: user&#61;0.13 sys&#61;0.00, real&#61;0.11 secs] 2020-01-05T23:19:55.235&#43;0900: 7.490: [GC (Allocation Failure) [PSYoungGen: 611822K->87016K(611840K)] 626986K->115821K(2010112K), 0.1139269 secs] [Times: user&#61;0.14 sys&#61;0.00, real&#61;0.11 secs] 2020-01-05T23:19:56.327&#43;0900: 8.582: [GC (Allocation Failure) [PSYoungGen: 611816K->87027K(567808K)] 640621K->128814K(1966080K), 0.1180981 secs] [Times: user&#61;0.14 sys&#61;0.00, real&#61;0.12 secs] 2020-01-05T23:19:57.348&#43;0900: 9.604: [GC (Allocation Failure) [PSYoungGen: 567795K->71671K(552448K)] 609582K->135104K(1950720K), 0.1114503 secs] [Times: user&#61;0.15 sys&#61;0.01, real&#61;0.11 secs] 2020-01-05T23:19:58.354&#43;0900: 10.609: [GC (Allocation Failure) [PSYoungGen: 552439K->66184K(583680K)] 615872K->135630K(1981952K), 0.0916476 secs] [Times: user&#61;0.11 sys&#61;0.00, real&#61;0.09 secs] 2020-01-05T23:19:59.322&#43;0900: 11.577: [GC (Allocation Failure) [PSYoungGen: 538760K->67584K(540672K)] 608206K->141004K(1938944K), 0.0973829 secs] [Times: user&#61;0.10 sys&#61;0.00, real&#61;0.09 secs] 2020-01-05T23:20:00.318&#43;0900: 12.573: [GC (Allocation Failure) [PSYoungGen: 540160K->62804K(583680K)] 613580K->136892K(1981952K), 0.0907325 secs] [Times: user&#61;0.10 sys&#61;0.00, real&#61;0.09 secs] 2020-01-05T23:20:01.288&#43;0900: 13.543: [GC (Allocation Failure) [PSYoungGen: 532308K->60618K(530432K)] 606396K->136932K(1928704K), 0.0897034 secs] [Times: user&#61;0.10 sys&#61;0.00, real&#61;0.09 secs] 2020-01-05T23:20:02.279&#43;0900: 14.534: [GC (Allocation Failure) [PSYoungGen: 530122K->60888K(583680K)] 606436K->139873K(1981952K), 0.0858016 secs] [Times: user&#61;0.10 sys&#61;0.01, real&#61;0.09 secs] 2020-01-05T23:20:03.260&#43;0900: 15.516: [GC (Allocation Failure) [PSYoungGen: 529368K->58731K(583680K)] 608353K->140375K(1981952K), 0.0869533 secs] [Times: user&#61;0.09 sys&#61;0.00, real&#61;0.09 secs] 2020-01-05T23:20:04.301&#43;0900: 16.556: [GC (Allocation Failure) [PSYoungGen: 527211K->63584K(585728K)] 608855K->146291K(1984000K), 0.0655176 secs] [Times: user&#61;0.15 sys&#61;0.00, real&#61;0.07 secs] 2020-01-05T23:20:05.346&#43;0900: 17.601: [GC (Metadata GC Threshold) [PSYoungGen: 354723K->35935K(507392K)] 437431K->122550K(1905664K), 0.0305506 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.03 secs] 2020-01-05T23:20:05.376&#43;0900: 17.632: [Full GC (Metadata GC Threshold) [PSYoungGen: 35935K->0K(507392K)] [ParOldGen: 86614K->66689K(1398272K)] 122550K->66689K(1905664K), [Metaspace: 20808K->20808K(1069056K)], 0.1114898 secs] [Times: user&#61;0.27 sys&#61;0.00, real&#61;0.11 secs] 2020-01-05T23:20:07.931&#43;0900: 20.186: [GC (Allocation Failure) [PSYoungGen: 471040K->96033K(573440K)] 537729K->162730K(1971712K), 0.0645804 secs] [Times: user&#61;0.23 sys&#61;0.01, real&#61;0.07 secs] 2020-01-05T23:20:08.924&#43;0900: 21.180: [GC (Metadata GC Threshold) [PSYoungGen: 461091K->50425K(578048K)] 527788K->195839K(1976320K), 0.1119199 secs] [Times: user&#61;0.37 sys&#61;0.04, real&#61;0.11 secs] 2020-01-05T23:20:09.037&#43;0900: 21.292: [Full GC (Metadata GC Threshold) [PSYoungGen: 50425K->0K(578048K)] [ParOldGen: 145414K->152550K(1398272K)] 195839K->152550K(1976320K), [Metaspace: 34827K->34827K(1081344K)], 0.2710840 secs] [Times: user&#61;0.97 sys&#61;0.00, real&#61;0.27 secs] 2020-01-05T23:20:37.552&#43;0900: 49.807: [GC (Allocation Failure) [PSYoungGen: 457216K->91166K(573952K)] 609766K->243725K(1972224K), 0.0500097 secs] [Times: user&#61;0.14 sys&#61;0.00, real&#61;0.05 secs] 2020-01-05T23:28:17.593&#43;0900: 509.848: [GC (Allocation Failure) [PSYoungGen: 545310K->72860K(576512K)] 697869K->306887K(1974784K), 0.1230360 secs] [Times: user&#61;0.39 sys&#61;0.04, real&#61;0.12 secs] 2020-01-05T23:28:25.052&#43;0900: 517.307: [GC (Allocation Failure) [PSYoungGen: 527004K->15427K(569856K)] 761031K->317210K(1968128K), 0.0856745 secs] [Times: user&#61;0.27 sys&#61;0.04, real&#61;0.09 secs] 2020-01-05T23:30:11.071&#43;0900: 623.326: [GC (Metadata GC Threshold) [PSYoungGen: 181991K->8842K(461312K)] 483774K->310632K(1859584K), 0.0082892 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-05T23:30:11.079&#43;0900: 623.334: [Full GC (Metadata GC Threshold) [PSYoungGen: 8842K->0K(461312K)] [ParOldGen: 301790K->267579K(1398272K)] 310632K->267579K(1859584K), [Metaspace: 57498K->57498K(1101824K)], 0.6438826 secs] [Times: user&#61;2.32 sys&#61;0.00, real&#61;0.65 secs] 2020-01-05T23:30:52.520&#43;0900: 664.775: [GC (Allocation Failure) [PSYoungGen: 452096K->19159K(570368K)] 719675K->286746K(1968640K), 0.0266003 secs] [Times: user&#61;0.05 sys&#61;0.00, real&#61;0.02 secs] 2020-01-05T23:42:12.313&#43;0900: 1344.568: [GC (Allocation Failure) [PSYoungGen: 462039K->23505K(570880K)] 729626K->291101K(1969152K), 0.0261176 secs] [Times: user&#61;0.06 sys&#61;0.00, real&#61;0.03 secs] 2020-01-05T23:46:48.294&#43;0900: 1620.549: [GC (Allocation Failure) [PSYoungGen: 466385K->19256K(573440K)] 733981K->286859K(1971712K), 0.0225196 secs] [Times: user&#61;0.07 sys&#61;0.00, real&#61;0.03 secs] 2020-01-05T23:49:34.573&#43;0900: 1786.828: [GC (Allocation Failure) [PSYoungGen: 465720K->22323K(571904K)] 733323K->289934K(1970176K), 0.0216443 secs] [Times: user&#61;0.05 sys&#61;0.00, real&#61;0.02 secs] 2020-01-05T23:50:53.476&#43;0900: 1865.731: [GC (Allocation Failure) [PSYoungGen: 468787K->26544K(580096K)] 736398K->294163K(1978368K), 0.0308614 secs] [Times: user&#61;0.11 sys&#61;0.00, real&#61;0.03 secs] 2020-01-05T23:53:47.861&#43;0900: 2040.116: [GC (Allocation Failure) [PSYoungGen: 483760K->26837K(576000K)] 751379K->294464K(1974272K), 0.0260971 secs] [Times: user&#61;0.06 sys&#61;0.00, real&#61;0.02 secs] 2020-01-05T23:59:11.001&#43;0900: 2363.256: [GC (Allocation Failure) [PSYoungGen: 484053K->30975K(588800K)] 751680K->298610K(1987072K), 0.0325437 secs] [Times: user&#61;0.06 sys&#61;0.00, real&#61;0.03 secs] 2020-01-06T00:03:00.735&#43;0900: 2592.990: [GC (Allocation Failure) [PSYoungGen: 505087K->27442K(584192K)] 772722K->295085K(1982464K), 0.0233883 secs] [Times: user&#61;0.06 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T00:07:55.839&#43;0900: 2888.094: [GC (Allocation Failure) [PSYoungGen: 501554K->25833K(596992K)] 769197K->293476K(1995264K), 0.0226115 secs] [Times: user&#61;0.05 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T00:24:56.106&#43;0900: 3908.361: [GC (Allocation Failure) [PSYoungGen: 516841K->26611K(592896K)] 784484K->294262K(1991168K), 0.0250583 secs] [Times: user&#61;0.08 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T02:44:12.610&#43;0900: 12264.865: [GC (Allocation Failure) [PSYoungGen: 517619K->32207K(606208K)] 785270K->299866K(2004480K), 0.0308408 secs] [Times: user&#61;0.09 sys&#61;0.00, real&#61;0.03 secs] 2020-01-06T05:49:25.682&#43;0900: 23377.937: [GC (Allocation Failure) [PSYoungGen: 540623K->29211K(601088K)] 808282K->296878K(1999360K), 0.0269082 secs] [Times: user&#61;0.09 sys&#61;0.00, real&#61;0.03 secs] 2020-01-06T07:00:25.823&#43;0900: 27638.078: [GC (Allocation Failure) [PSYoungGen: 537627K->32605K(614400K)] 805294K->300280K(2012672K), 0.0345842 secs] [Times: user&#61;0.10 sys&#61;0.00, real&#61;0.03 secs] 2020-01-06T07:03:44.371&#43;0900: 27836.626: [GC (Allocation Failure) [PSYoungGen: 558429K->30572K(610304K)] 826104K->298255K(2008576K), 0.0233915 secs] [Times: user&#61;0.08 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T07:08:34.260&#43;0900: 28126.515: [GC (Allocation Failure) [PSYoungGen: 556396K->29196K(621568K)] 824079K->296887K(2019840K), 0.0274276 secs] [Times: user&#61;0.07 sys&#61;0.00, real&#61;0.03 secs] 2020-01-06T07:11:04.894&#43;0900: 28277.149: [GC (Allocation Failure) [PSYoungGen: 570380K->30523K(618496K)] 838071K->305900K(2016768K), 0.0270954 secs] [Times: user&#61;0.09 sys&#61;0.00, real&#61;0.03 secs] 2020-01-06T07:14:56.568&#43;0900: 28508.824: [GC (Allocation Failure) [PSYoungGen: 571707K->24958K(627200K)] 847084K->303210K(2025472K), 0.0180911 secs] [Times: user&#61;0.06 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T07:16:45.440&#43;0900: 28617.695: [GC (Allocation Failure) [PSYoungGen: 578430K->21604K(625152K)] 856682K->301639K(2023424K), 0.0167921 secs] [Times: user&#61;0.05 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T07:22:36.357&#43;0900: 28968.612: [GC (Allocation Failure) [PSYoungGen: 575076K->22345K(631296K)] 855111K->305516K(2029568K), 0.0218111 secs] [Times: user&#61;0.07 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T07:26:15.387&#43;0900: 29187.642: [GC (Allocation Failure) [PSYoungGen: 584009K->17434K(629248K)] 867180K->303144K(2027520K), 0.0194157 secs] [Times: user&#61;0.07 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T07:29:23.878&#43;0900: 29376.133: [GC (Allocation Failure) [PSYoungGen: 579098K->14396K(633344K)] 864808K->302173K(2031616K), 0.0137783 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T07:34:25.326&#43;0900: 29677.581: [GC (Allocation Failure) [PSYoungGen: 581180K->16861K(632320K)] 868957K->305521K(2030592K), 0.0129767 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T07:36:11.252&#43;0900: 29783.507: [GC (Allocation Failure) [PSYoungGen: 583645K->17093K(636928K)] 872305K->306163K(2035200K), 0.0115739 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T07:37:45.601&#43;0900: 29877.856: [GC (Allocation Failure) [PSYoungGen: 590021K->13445K(634880K)] 879091K->302547K(2033152K), 0.0109445 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T07:41:17.229&#43;0900: 30089.484: [GC (Allocation Failure) [PSYoungGen: 586373K->14074K(640000K)] 875475K->303648K(2038272K), 0.0168848 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T07:44:42.620&#43;0900: 30294.875: [GC (Allocation Failure) [PSYoungGen: 593658K->16689K(638464K)] 883232K->306673K(2036736K), 0.0167329 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T07:48:41.238&#43;0900: 30533.493: [GC (Allocation Failure) [PSYoungGen: 596273K->16481K(644096K)] 886257K->306718K(2042368K), 0.0171100 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T07:50:22.454&#43;0900: 30634.709: [GC (Allocation Failure) [PSYoungGen: 603745K->14065K(642048K)] 893982K->305318K(2040320K), 0.0152943 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T07:52:12.846&#43;0900: 30745.101: [GC (Allocation Failure) [PSYoungGen: 601329K->14895K(648192K)] 892582K->306284K(2046464K), 0.0133542 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T07:54:38.095&#43;0900: 30890.351: [GC (Allocation Failure) [PSYoungGen: 610351K->16155K(646144K)] 901740K->308079K(2044416K), 0.0162264 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T07:57:01.134&#43;0900: 31033.389: [GC (Allocation Failure) [PSYoungGen: 611611K->12422K(651776K)] 903535K->309245K(2050048K), 0.0124394 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T07:59:28.563&#43;0900: 31180.818: [GC (Allocation Failure) [PSYoungGen: 615558K->10299K(650240K)] 912381K->307330K(2048512K), 0.0089547 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:01:08.940&#43;0900: 31281.195: [GC (Allocation Failure) [PSYoungGen: 613435K->7617K(653312K)] 910466K->304823K(2051584K), 0.0108112 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:01:47.664&#43;0900: 31319.919: [GC (Allocation Failure) [PSYoungGen: 614849K->8736K(652800K)] 912055K->306093K(2051072K), 0.0096603 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:02:43.404&#43;0900: 31375.659: [GC (Allocation Failure) [PSYoungGen: 615968K->10357K(656384K)] 913325K->307785K(2054656K), 0.0153230 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T08:03:32.089&#43;0900: 31424.344: [GC (Allocation Failure) [PSYoungGen: 622709K->9876K(654848K)] 920137K->307360K(2053120K), 0.0091163 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:04:38.892&#43;0900: 31491.147: [GC (Allocation Failure) [PSYoungGen: 622228K->10833K(659456K)] 919712K->308543K(2057728K), 0.0114602 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:06:32.184&#43;0900: 31604.439: [GC (Allocation Failure) [PSYoungGen: 629329K->12160K(657920K)] 927039K->310502K(2056192K), 0.0148085 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:07:12.954&#43;0900: 31645.209: [GC (Allocation Failure) [PSYoungGen: 630656K->9024K(663040K)] 928998K->307406K(2061312K), 0.0094088 secs] [Times: user&#61;0.02 sys&#61;0.01, real&#61;0.01 secs] 2020-01-06T08:10:03.632&#43;0900: 31815.887: [GC (Allocation Failure) [PSYoungGen: 634688K->9428K(661504K)] 933070K->308386K(2059776K), 0.0159207 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T08:12:06.099&#43;0900: 31938.354: [GC (Allocation Failure) [PSYoungGen: 635092K->10675K(665600K)] 934050K->310088K(2063872K), 0.0160413 secs] [Times: user&#61;0.05 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T08:12:56.772&#43;0900: 31989.027: [GC (Allocation Failure) [PSYoungGen: 641459K->10402K(664064K)] 940872K->310039K(2062336K), 0.0094674 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:13:38.263&#43;0900: 32030.518: [GC (Allocation Failure) [PSYoungGen: 641186K->11147K(668672K)] 1958820K->1328935K(2066944K), 0.0128476 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:14:57.776&#43;0900: 32110.031: [GC (Allocation Failure) [PSYoungGen: 648075K->7503K(667136K)] 1965863K->1325817K(2065408K), 0.0116505 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:14:57.788&#43;0900: 32110.043: [Full GC (Ergonomics) [PSYoungGen: 7503K->0K(667136K)] [ParOldGen: 1318313K->307410K(1398272K)] 1325817K->307410K(2065408K), [Metaspace: 88772K->88236K(1132544K)], 0.7520090 secs] [Times: user&#61;1.13 sys&#61;0.42, real&#61;0.76 secs] 2020-01-06T08:15:51.686&#43;0900: 32163.941: [GC (Allocation Failure) [PSYoungGen: 636928K->5442K(670208K)] 944338K->312852K(2068480K), 0.0058668 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:17:32.126&#43;0900: 32264.381: [GC (Allocation Failure) [PSYoungGen: 646466K->8621K(669696K)] 953876K->316031K(2067968K), 0.0078541 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:19:22.193&#43;0900: 32374.448: [GC (Allocation Failure) [PSYoungGen: 649645K->11187K(672768K)] 957055K->318605K(2071040K), 0.0131285 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:20:31.878&#43;0900: 32444.133: [GC (Allocation Failure) [PSYoungGen: 656307K->11983K(671232K)] 963725K->319409K(2069504K), 0.0113046 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:21:49.865&#43;0900: 32522.120: [GC (Allocation Failure) [PSYoungGen: 657103K->10496K(675328K)] 964529K->317922K(2073600K), 0.0138773 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:22:59.545&#43;0900: 32591.800: [GC (Allocation Failure) [PSYoungGen: 660736K->9532K(673792K)] 968162K->316958K(2072064K), 0.0116455 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:23:54.989&#43;0900: 32647.244: [GC (Allocation Failure) [PSYoungGen: 659772K->10088K(676864K)] 967198K->317522K(2075136K), 0.0089282 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:25:58.657&#43;0900: 32770.912: [GC (Allocation Failure) [PSYoungGen: 663912K->12374K(675840K)] 971346K->319816K(2074112K), 0.0086536 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:26:59.017&#43;0900: 32831.272: [GC (Allocation Failure) [PSYoungGen: 666198K->14027K(677376K)] 973640K->321469K(2075648K), 0.0121039 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:28:02.810&#43;0900: 32895.065: [GC (Allocation Failure) [PSYoungGen: 669899K->12774K(677376K)] 977341K->320224K(2075648K), 0.0158129 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:29:23.693&#43;0900: 32975.948: [GC (Allocation Failure) [PSYoungGen: 668646K->14748K(677888K)] 976096K->322206K(2076160K), 0.0137001 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:30:26.849&#43;0900: 33039.105: [GC (Allocation Failure) [PSYoungGen: 671644K->12526K(677888K)] 979102K->319992K(2076160K), 0.0098109 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:31:02.270&#43;0900: 33074.525: [GC (Allocation Failure) [PSYoungGen: 669422K->14945K(677376K)] 976888K->322411K(2075648K), 0.0102732 secs] [Times: user&#61;0.02 sys&#61;0.01, real&#61;0.01 secs] 2020-01-06T08:31:53.330&#43;0900: 33125.585: [GC (Allocation Failure) [PSYoungGen: 671841K->16031K(673280K)] 979307K->323505K(2071552K), 0.0098693 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:32:57.688&#43;0900: 33189.943: [GC (Allocation Failure) [PSYoungGen: 672927K->12139K(678400K)] 980401K->319613K(2076672K), 0.0074225 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:34:06.491&#43;0900: 33258.746: [GC (Allocation Failure) [PSYoungGen: 669035K->9896K(677376K)] 976509K->320104K(2075648K), 0.0104990 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:35:49.015&#43;0900: 33361.270: [GC (Allocation Failure) [PSYoungGen: 666792K->9146K(678912K)] 977000K->319697K(2077184K), 0.0158445 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T08:37:02.322&#43;0900: 33434.577: [GC (Allocation Failure) [PSYoungGen: 667578K->11529K(678400K)] 978129K->322224K(2076672K), 0.0126323 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:38:59.573&#43;0900: 33551.828: [GC (Allocation Failure) [PSYoungGen: 669961K->13533K(679424K)] 980656K->324853K(2077696K), 0.0107700 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:40:20.684&#43;0900: 33632.939: [GC (Allocation Failure) [PSYoungGen: 673501K->15688K(675840K)] 984821K->327230K(2074112K), 0.0114122 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:41:22.495&#43;0900: 33694.750: [GC (Allocation Failure) [PSYoungGen: 675656K->12681K(679424K)] 987198K->324322K(2077696K), 0.0097255 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:42:07.272&#43;0900: 33739.527: [GC (Allocation Failure) [PSYoungGen: 672137K->10344K(678912K)] 983778K->322026K(2077184K), 0.0074183 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:42:46.435&#43;0900: 33778.690: [GC (Allocation Failure) [PSYoungGen: 669800K->14043K(679936K)] 981482K->326048K(2078208K), 0.0087399 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:46:48.347&#43;0900: 34020.602: [GC (Allocation Failure) [PSYoungGen: 675035K->16256K(677376K)] 987040K->328591K(2075648K), 0.0107534 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:49:34.039&#43;0900: 34186.294: [GC (Allocation Failure) [PSYoungGen: 677091K->13248K(679424K)] 989426K->325727K(2077696K), 0.0113938 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:50:20.316&#43;0900: 34232.571: [GC (Allocation Failure) [PSYoungGen: 672704K->15212K(678912K)] 985183K->327847K(2077184K), 0.0148027 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:51:58.463&#43;0900: 34330.718: [GC (Allocation Failure) [PSYoungGen: 674668K->11400K(679936K)] 987303K->324970K(2078208K), 0.0200433 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T08:54:54.423&#43;0900: 34506.678: [GC (Allocation Failure) [PSYoungGen: 671880K->14974K(679424K)] 985450K->328969K(2077696K), 0.0126501 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T08:56:23.894&#43;0900: 34596.149: [GC (Allocation Failure) [PSYoungGen: 675454K->11358K(679936K)] 989449K->325592K(2078208K), 0.0087270 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T08:57:11.153&#43;0900: 34643.408: [GC (Allocation Failure) [PSYoungGen: 671838K->15738K(679424K)] 986072K->330065K(2077696K), 0.0136408 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T08:58:21.502&#43;0900: 34713.757: [GC (Allocation Failure) [PSYoungGen: 676218K->14785K(679424K)] 990545K->329407K(2077696K), 0.0148081 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.02 secs] 2020-01-06T09:00:29.410&#43;0900: 34841.665: [GC (Allocation Failure) [PSYoungGen: 674753K->13009K(679424K)] 989375K->328084K(2077696K), 0.0140268 secs] [Times: user&#61;0.04 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T09:01:33.005&#43;0900: 34905.260: [GC (Allocation Failure) [PSYoungGen: 672977K->14159K(679936K)] 988052K->329792K(2078208K), 0.0100609 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T09:03:24.877&#43;0900: 35017.132: [GC (Allocation Failure) [PSYoungGen: 675151K->11838K(679936K)] 990784K->327865K(2078208K), 0.0120545 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T09:04:41.194&#43;0900: 35093.449: [GC (Allocation Failure) [PSYoungGen: 672830K->14155K(680448K)] 988857K->330912K(2078720K), 0.0111023 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T09:05:26.354&#43;0900: 35138.609: [GC (Allocation Failure) [PSYoungGen: 676171K->11934K(680448K)] 992928K->329174K(2078720K), 0.0088901 secs] [Times: user&#61;0.02 sys&#61;0.01, real&#61;0.01 secs] 2020-01-06T09:06:26.646&#43;0900: 35198.901: [GC (Allocation Failure) [PSYoungGen: 673950K->11787K(680960K)] 991190K->329242K(2079232K), 0.0080550 secs] [Times: user&#61;0.03 sys&#61;0.00, real&#61;0.01 secs] 2020-01-06T09:07:43.308&#43;0900: 35275.563: [GC (Allocation Failure) [PSYoungGen: 674827K->10907K(680960K)] 992282K->328496K(2079232K), 0.0091215 secs] [Times: user&#61;0.02 sys&#61;0.00, real&#61;0.01 secs]

esrse · Accepted Answer

대개 young gc에 대해서 수행하는 minor gc 는 서비스 성능에 큰 지장을 주지 않습니다.그러나 full gc는 서비스에 지장을 줄 수 있습니다. full gc때 서비스 응답 시간이 튀지 않았는지, 튀었다면 허용할 수준인지 확인해보세요.

gwk · Answer

https://stackoverflow.com/a/28357523Allocation에 실패했기때문에 GC를 수행했다는 의미입니다.

TheCross · Answer

해결법은..메모리를 더 늘려볼까요?ㅠ할당실패여서 GC가 수행했다는건 아는데, 아직 개념이 부족해서인지 판단이 안섭니다.. 그래프에서도 peak 때 2G까지 치솟는거보면..heap 늘리기전에 tomcat 로그엔 oom:java heap space 에러가 있었는데 1G 더 늘리니 이건 해결이 되네요.

gwk · Answer

저게 나오는게 이상한게 아닙니다.메모리 자체가 물리적인 한계가 있기때문에 GC는 무조건 일어나는게 맞고GC에 의해 어플리케이션 퍼포먼스에 큰 지장을 주는것이 아니면 그냥 사용하시면 됩니다.

TheCross · Answer

아 어쩃든 심각한건 아니라는 말씀이시군요? 그럼 계속 지속되더라도 서비스에 큰 지장이 없다면 tomcat이 죽거나 그럴일은 없겠네요.

TheCross · Answer

추가로 질문있습니다 ㅠ 서비스성능에 큰 지장이 없다는게 그러면 youngGC(minor GC)가 수행하는 동안은 어플리케이션은 정상적으로 계속 수행되는건가요? (무중단) 혹시 GC가 수행하는동안 (GC 수행 쓰레드제외) 모든 쓰레드가 중단하나요? ex) FullGC(MajorGC)수행하는 동안 서비스 멈춤, dump추출 하는동안 서비스 멈춤제가 알기로는 위 해당사항을 수행하는 동안은 잠시 어플리케이션 수행이 중단되는 걸로 알고 있습니다. 갑자기 헷갈리네요...

gwk · Answer

stop-the-world의 경우 어떤 컬렉터를 쓰느냐에 따라 어느 시점에서 발생하는지가 다릅니다.제가 알고있는 수준으로는 GC의 발전 방향이1) 최대한 많은 리소스를 투자하여 throughput을 늘려서 빨리 끝내자2) stop-the-world 상황을 최대한 줄여서 application의 동작에 영향을 주지 말자라고 알고있습니다.두개가 미묘하게 같은것같으면서 관련 내용을 찾아보시면 다르다는 것을 아실 수 있습니다.

esrse · Answer

minor/major GC 모두 stop the world 는 동반을 합니다. STW가 필요한 한가지 이유로는, gc를 하면서 객체가 메모리 상에 놓인 위치를 변경해야 하기 때문입니다. 만약 이 작업이 진행되는 동안에 애플리케이션의 쓰레드가 동작한다면 비정상적인 객체에 대해서 참조를 해버립니다. STW가 없어서 문제되는 상황을 예를 들면, 애플리케이션이 어떤 객체 O에 멤버변수 v에 1 이라는 값을 할당했다고 칩시다. 그런데 이때 gc가 진행중이어서 이 객체가 메모리 주소 0x1000에서 0x2000 으로 옮겨졌습니다. 여기서 생길 수 있는 문제는 애플리케이션이 값을 할당한 객체는 0x1000에 놓여져있는 것이었는데, 객체 O에 대해서 0x1000 -> 0x2000 메모리 복사는 이미 진행이 완료돼버린 상황입니다. 그러면 나중에 애플리케이션이 다시 O.v 참조했을 때 1이 아닌 기존 값이 읽힐 것입니다.다만 minor GC가 발생했을 때 애플리케이션에 미치는 STW 영향은 매우 작기 때문에 신경을 쓸 필요가 없습니다.그리고 GC 작업은 여러개의 절차들로 이뤄져 있습니다. 그런데 STW는 그중 몇개 절차에만 동반됩니다. 따라서 GC 전체 작업시간이 STW는 아닙니다.

GC Log - Allocation Failure 해결 질문

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