为什么会抛出OOM?
问题描述:
这里是服务器1的堆内存信息为什么会抛出OOM?
Heap Configuration:
MinHeapFreeRatio = 40
MaxHeapFreeRatio = 70
MaxHeapSize = 1073741824 (1024.0MB)
NewSize = 1310720 (1.25MB)
MaxNewSize = 17592186044415 MB
OldSize = 5439488 (5.1875MB)
NewRatio = 2
SurvivorRatio = 8
PermSize = 157286400 (150.0MB)
MaxPermSize = 157286400 (150.0MB)
Heap Usage:
PS Young Generation
Eden Space:
capacity = 19922944 (19.0MB)
used = 19911792 (18.989364624023438MB)
free = 11152 (0.0106353759765625MB)
99.94402433696546% used
From Space:
capacity = 12517376 (11.9375MB)
used = 0 (0.0MB)
free = 12517376 (11.9375MB)
0.0% used
To Space:
capacity = 13303808 (12.6875MB)
used = 0 (0.0MB)
free = 13303808 (12.6875MB)
0.0% used
PS Old Generation
capacity = 715849728 (682.6875MB)
used = 715848480 (682.6863098144531MB)
free = 1248 (0.001190185546875MB)
99.99982566173442% used
PS Perm Generation
capacity = 157286400 (150.0MB)
used = 79364440 (75.68782806396484MB)
free = 77921960 (74.31217193603516MB)
50.45855204264323% used
我分配1024M内存给JVM堆,但是当它OOM
我有另一台服务器的JVM不占用内存,接下来就是服务器的堆内存信息时,它是OOM
Heap Configuration:
MinHeapFreeRatio = 40
MaxHeapFreeRatio = 70
MaxHeapSize = 1073741824 (1024.0MB)
NewSize = 1310720 (1.25MB)
MaxNewSize = 17592186044415 MB
OldSize = 5439488 (5.1875MB)
NewRatio = 2
SurvivorRatio = 8
PermSize = 157286400 (150.0MB)
MaxPermSize = 157286400 (150.0MB)
Heap Usage:
PS Young Generation
Eden Space:
capacity = 119341056 (113.8125MB)
used = 119253176 (113.72869110107422MB)
free = 87880 (0.08380889892578125MB)
99.92636230736889% used
From Space:
capacity = 111869952 (106.6875MB)
used = 0 (0.0MB)
free = 111869952 (106.6875MB)
0.0% used
To Space:
capacity = 111149056 (106.0MB)
used = 0 (0.0MB)
free = 111149056 (106.0MB)
0.0% used
PS Old Generation
capacity = 715849728 (682.6875MB)
used = 715849720 (682.6874923706055MB)
free = 8 (7.62939453125E-6MB)
99.99999888244702% used
PS Perm Generation
capacity = 157286400 (150.0MB)
used = 110605624 (105.48174285888672MB)
free = 46680776 (44.51825714111328MB)
70.32116190592448% used
此服务器看起来简单正常的,内存是真正的不够
谁可以提供服务器的明确解释1 OOM
答
正如弗拉基米尔所说 - 您的OldGen已满,您应该检查NewRatio和Survivor比率。您也可以开始你的GC日志应用,并分析它的外部工具,例如:http://gceasy.io(免费)或JClarity Censum(付费)
通过提供标志启用GC日志: -XX:+ PrintGCDetails -XX: + PrintGCDateStamps -Xloggc:gc.log
+0
谢谢,我这次不保存gc日志,所以无法分析。我会在下次尝试。 –
答
你有一个MinHeapFreeRatio = 40
这意味着GC应该在这个时候踢。理想情况下,您的终身空间应低于此百分比。
旧的似乎是682 MB,这意味着它应该至少是682/0.4或1700 MB(这比你的总数要多),但是我怀疑如果应用程序被允许的话它确实需要高得多跑得更久。
如果这个数字令人惊讶,我建议你使用你的内存分析器来查看你是否有内存泄漏,或者你可以减少内存消耗。
在这两种情况下,伊甸园和OldGen都满了,所以我猜这是OOM的原因。但是,第一台服务器的NewGen容量较少。服务器1使用什么JVM设置?你有没有试过玩NewRatio和SurvivorRatio? –
我不更改NewRatio和SurvivorRatio,因为您看到两个服务器默认情况下具有相同的NewRatio和SurvivorRatio。 –