Question

我有一个问题：伊甸园100％使用，旧100％使用，从空间100％使用，但没有垃圾收集触发，没有oom

jmap -heap [pid]结果

Eden Space:    
capacity = 859045888 (819.25MB)    
used     = 859045888(819.25MB)   
free     = 0 (0.0MB)
100.0% used 
From Space:    
capacity = 107347968 (102.375MB)    
used     = 12370032(11.796981811523438MB)    
free     = 16441280 (90.57801818847656MB)
0.0% used 
To Space:    
capacity = 107347968 (102.375MB)   
used     = 0 (0.0MB)    
free     = 107347968 (102.375MB)
 0.0% used 
PS Old generation:    
capacity = 1073741824 (1024.0MB)   
used     = 1073741816 (1023.0832290649414MB)    
free     = 8 (7.62399453125E-6MB)
 99.99999925494154% used 
Perm Generation:    
capacity = 268435456 (256.0MB)    
used     = 79784056 (76.08800506591797MB)    
free     = 188651400 (179.91199493408203MB)
 29.721876978874207% used

jstat -gcutil [pid] 1000
   S0     S1     E      O      P     YGC   YGCT    FGC    FGCT     GCT
  11.52  0.00  100.00  100.00  30.28  22   5.87     3    6.136    11.723
  11.52  0.00  100.00  100.00  30.28  22   5.87     3    6.136    11.723
  11.52  0.00  100.00  100.00  30.28  22   5.87     3    6.136    11.723
  11.52  0.00  100.00  100.00  30.28  22   5.87     3    6.136    11.723
  11.52  0.00  100.00  100.00  30.28  22   5.87     3    6.136    11.723
  11.52  0.00  100.00  100.00  30.28  22   5.87     3    6.136    11.723

我的vm args是

-Xmx2g -Xms2g -Xmn1g -XX：SurvivorRatio = 8 -XX：PermSize = 256m -XX：MaxPermSize = 256m -XX：+ HeapDumpOnOutOfMemoryError -XX：ReservedCodeCacheSize = 128m -XX：InitialCodeCacheSize = 128m -XX：+ DisableExplicitGC - XX：+ PrintGCDetails -XX：+ PrintGCDateStamps -XX：+ PrintGCTimeStamps -XX：+ PrintHeapAtGC -XX：+ PrintTenuringDistribution -XX：+ UseConcMarkSweepGC -XX：+ UseCMSCompactAtFullCollection -XX：CMSFullGCsBeforeCompaction = 0 -XX：CMSInitiatingOccupancyFraction = 80

如何解决？

Answer 1

为什么会出现这种复杂的jvm parameters（您缺少-Xloggc:/path/to/file以避免详细记录）。

我发现很难相信没有GC被触发。如果我是你，你会从一个更容易理解的选项开始，并从那里迭代。请记住，在大多数情况下，只需设置Xms和Xmx即可。由于heap基于比率，其余的是人体工程学。

内存已满但不是垃圾回收

1 个答案: