Re: Help: UnmarshalException running Jini

SamsonLim wrote:
> Yes I can change the code and I'll try put an exception block on the method.
> I think I've pseudo-fixed the problem by serializing some other classes
> which I didn't earlier because it didn't seem like I needed to. However, I
> still occasionally see the same error posted earlier. 
> 
> Another question if I may. I keep getting a java.lang.OutofMemory error when
> I attempt to run large number of tasks, which isn't actually that large
> considering I'm running them on a 64-node dual processor cluster with 4GB
> mem each (max heap size is set to over 3GB). The mem and load monitor on the
> cluster didn't show any signs of heavy utilization either. Hence, the
> question is if there is actually a prescribed memory limit on a JavaSpace
> when one creates it? My main Javaspace is created on an independent node
> with 4GB mem and barely use 15% mem when the error occurs. Thx.

There is no prescribed limit.  There are Heap and related VM configuration 
issues.  When you see OOM, use "kill -QUIT <pid>" on that VM to get a stack 
trace, and then use kill -11 on that VM to force it to panic and dump out VM 
config information (it's at the end of the hs_err_... file).  There are of 
course tools such as the "Your Kit Java Profiler" which allow you to attach to a 
hot VM, as well as force a heap dump at 90% heap usage which should typically 
show you the high running object counts.

Gregg Wonderly

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