java run out of memory issue

Question

I have a jar file running on an amazon-ec2-m1.large instance with linux 64bit operating system. I run out of memory after different hours, usually between 2-4, although in m

Answer 1

I was able to resolve an almost identical error by following the advice given by:

https://confluence.csiro.au/pages/viewpage.action?pageId=278167841

Essentially, they state:

When the Java Virtual Machine starts, by default it spawns a number of Garbage Collection (GC) threads, which are used for parallel GC operations … the number of such threads is calculated by this formula: (ncpus <= 8) ? ncpus : 3 + ((ncpus * 5) / 8) … Because of the creation of these many threads … the program will automatically reach the system limit …

I limited the number of garbage collecting threads using the environment variable, like so:

export _JAVA_OPTIONS="-XX:ParallelGCThreads=2"

Not sure about the overall performance hit regarding GC, but at least today's work is done.

Please check the original post for more options.

Good Luck, - Stu