CODEWITHSUNDEEP
javamemory-leaks
LucianRadu
LucianRadu

Reputation: 85

Java memory increaseases in Task Manager but not in profiler

We developed an highly CPU intensive Java server application that is having a serious memory leak (or so it seems). As time passes, the application seems to eat up increasingly more memory (as seen with Windows Task Manager) but if I analyse it a specialized Java profiler the memory seems to be staying the same. For example, in task manager I see the application taking over 8gb of memory and growing, but in the Java profiler I see that heap memory is at most 2gb. I tried all possible combinations of JAVA_OPTS (-Xmx, -Xms, all types of GC) and nothing worked, Is the Java process not releasing memory back to OS? Is there any way to force it to do so?

Upvotes: 1

Views: 1104

Answers (1)

przemek hertel
przemek hertel

Reputation: 4014

1)

I suggest you to set -Xmx2100m and observe heap usage under load.

JVM may take as much OS memory as it decide to be performant, until it reaches Xmx limit. In modern JVMs default Xmx is calculated upon total memory available in OS, so it may be large value.

I think your app does not have memory leak, your JVM simply allocate a lot of memory, because it can.

Observe your JVM thru jvisualvm.

2)

Second suggestion - do you use any JNI code? Does your app call any native library (ie. dll under windows)?

Upvotes: 1

Related Questions