Java GC Allocation Failure

Question

Why always  GC  Allocation Failure     Java HotSpot TM  64-Bit Server VM  25 25-b02  for linux-amd64 JRE  1 8 0 25-b17     CommandLine flags   -XX CMSInitiatingOccupancyFraction 60  -XX GCLogFileSize 10485760  -XX  HeapDumpOnOutOfMemoryError  -XX InitialHeapSize 32212254720  -XX MaxHeapSize 32212254720  -XX NewRatio 10  -XX OldPLABSize 16  -XX ParallelGCThreads 4  -XX  PrintGC  -XX  PrintGCDetails  -XX  PrintGCTimeStamps  -XX  PrintStringTableStatistics  -XX  PrintTenuringDistribution  -XX StringTableSize 1000003  -XX SurvivorRatio 4  -XX TargetSurvivorRatio 50  -XX  UseCompressedClassPointers  -XX  UseCompressedOops -XX  UseParNewGC  -XX  UseConcMarkSweepGC     27 329   GC  Allocation Failure  27 329   ParNew Desired survivor size 44728320 bytes  new threshold 15  max 15  - age   1    16885304 bytes    16885304 total   349568K- gt 16618K 436928K   0 2069129 secs  349568K- gt 16618K 31369920K   0 2070712 secs   Times  user 0 78 sys 0 04  real 0 21 secs    28 210   GC  Allocation Failure  28 210   ParNew Desired survivor size 44728320 bytes  new threshold 15  max 15  - age   1    28866504 bytes    28866504 total - age   2    12582536 bytes    41449040 total   366186K- gt 47987K 436928K   0 2144807 secs  366186K- gt 47987K 31369920K   0 2146024 secs   Times  user 0 84 sys 0 01  real 0 22 secs    29 037   GC  Allocation Failure  29 038   ParNew Desired survivor size 44728320 bytes  new threshold 2  max 15  - age   1    28443488 bytes    28443488 total - age   2    28386624 bytes    56830112 total - age   3    12579928 bytes    69410040 total   397555K- gt 76018K 436928K   0 2357352 secs  397555K- gt 76018K 31369920K   0 2358535 secs   Times  user 0 93 sys 0 01  real 0 23 secs

User · Accepted Answer

Allocation Failure  is a cause of GC cycle to kick in    Allocation Failure  means that no more space left in Eden to allocate object  So  it is normal cause of young GC   Older JVM were not printing GC cause for minor GC cycles    Allocation Failure  is almost only possible cause for minor GC  Another reason for minor GC to kick could be CMS remark phase  if  XX  ScavengeBeforeRemark is enabled

User · Answer

Allocation Failure  is cause of GC to kick is not correct  It is an outcome of GC operation   GC kicks in when there is no space to allocate  depending on region minor or major GC is performed   Once GC is performed if space is freed good enough  but if there is not enough size it fails  Allocation Failure is one such failure   Below document have good explanation https   docs oracle com javase 8 docs technotes guides vm gctuning g1 gc html

User · Answer

When use CMS GC in jdk1 8 will appeare this error  i change the G1 Gc solve this problem    -Xss512k -Xms6g -Xmx6g -XX  UseG1GC -XX MaxGCPauseMillis 200 -XX InitiatingHeapOccupancyPercent 70 -XX NewRatio 1 -XX SurvivorRatio 6 -XX G1ReservePercent 10 -XX G1HeapRegionSize 32m -XX ConcGCThreads 6 -Xloggc gc log -XX  HeapDumpOnOutOfMemoryError -XX  PrintGC -XX  PrintGCDetails -XX  PrintGCTimeStamps

[java] Java GC (Allocation Failure)

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