CODEWITHSUNDEEP
javatomcatgarbage-collectionjvmheap-memory
martin
martin

Reputation: 111

Tomcat heap space full

After few days of running my java app on tomcat I get 100% CPU load on tomcat process. I did jmap to detect full memory. The app still process all incomming TCP request but does not start Web page (beacuse of full memory)

Why is CPU to 100%? Because of running Java Garbage Collector? But why it takes several hours? I have had to kill the process manualy a start tomcat again.

How to better setup tomcat memory with parameters Xms or Xmx? 

using thread-local object allocation.
Parallel GC with 2 thread(s)

Heap Configuration:
   MinHeapFreeRatio = 0
   MaxHeapFreeRatio = 100
   MaxHeapSize      = 1073741824 (1024.0MB)
   NewSize          = 1310720 (1.25MB)
   MaxNewSize       = 17592186044415 MB
   OldSize          = 5439488 (5.1875MB)
   NewRatio         = 2
   SurvivorRatio    = 8
   PermSize         = 21757952 (20.75MB)
   MaxPermSize      = 536870912 (512.0MB)
   G1HeapRegionSize = 0 (0.0MB)

Heap Usage:
PS Young Generation
Eden Space:
   capacity = 84410368 (80.5MB)
   used     = 84410368 (80.5MB)
   free     = 0 (0.0MB)
   100.0% used
From Space:
   capacity = 3670016 (3.5MB)
   used     = 0 (0.0MB)
   free     = 3670016 (3.5MB)
   0.0% used
To Space:
   capacity = 3670016 (3.5MB)
   used     = 0 (0.0MB)
   free     = 3670016 (3.5MB)
   0.0% used
PS Old Generation
   capacity = 715653120 (682.5MB)
   used     = 715497816 (682.3518905639648MB)
   free     = 155304 (0.14810943603515625MB)
   99.97829898373111% used
PS Perm Generation
   capacity = 78643200 (75.0MB)
   used     = 78253152 (74.62802124023438MB)
   free     = 390048 (0.371978759765625MB)
   99.5040283203125% used

31605 interned Strings occupying 3556200 bytes.

Upvotes: 0

Views: 521

Answers (1)

Leviand
Leviand

Reputation: 2805

As said in comments, when memory gets bursted in this way, this could probably be caused by a memory leak.

The only way to detect this is with dedicated tools.

I suggest you to use JProfiler , you can find a guide here on how to find a memory leak.

Hope this helps :)

Upvotes: 1

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