Re: JAVA USED 95% OF THE GC HEAP.

[Jim Oberholtzer <midrangel@xxxxxxxxxx>]

So it is telling you since it started the GC (Garbage Collection) has 
run 381 times

In an hour do it again.  Subtract it out and you know how often the GC 
is running.

Also your heap is set at 50M.  Good enough but since it gets up to 247M 
kinda quick, I would set your initial up to 275M or so.  I would also 
change the maximum to about 1G or at least 740M. (you have plenty of 
memory on your system if I remember correctly).  Then watch it.  That 
should solve your problem.  Since 5G seems to be where IBM wants to run 
the 64bit JVM instead of the 32bit JVM your still way under the limit 
for a 32bit JVM......

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 11/29/2011 3:40 PM, rob@xxxxxxxxx wrote:
<snip>
> Forgot to change the jobnumber and ran it and I got:
> JVAB612-Job contains a JVM which is not supported by this command.
>
> Ok, my bad.
>
> So I changed the job number and reran it.  I still get that message.
> Recovery  . . . :   Use the GENJVMDMP, PRTJVMJOB, and WRKJVMJOB commands
> instead of this command.
>
> Joblog says
> Server starting with user profile QEJBSVR and JDK 1.6.0.
>
> Picked the first off of the list, GENJVMDMP.  Ran "successfully". However,
> where is the output?  The help on the command doesn't clue me in.
> Something also tells me I should have changed the default from TYPE(*JAVA)
> to TYPE(*HEAP) but if I can't find the output first, who cares?
>
> So I ran PRTJVMJOB JOB(864283/QEJBSVR/AS70SVR) OPTION(*ALL)
> That generates 631 pages of stuff.  Around page 8:
> Display Garbage Collection Information
> Garbage collected heap:
>    Initial heap size  . . . . . . . . . :            50.000M
>    Maximum heap size  . . . . . . . . . :           256.000M
>    Current heap size  . . . . . . . . . :           247.116M
>    Heap in use  . . . . . . . . . . . . :           223.083M
> Other memory:
>    Internal memory size . . . . . . . . :           159.780M
>    JIT memory size  . . . . . . . . . . :            24.000M
>    Shared classes memory size . . . . . :            49.999M
> General GC information:
>    Current GC cycle . . . . . . . . . . :                381
>    GC policy type . . . . . . . . . . . :         OPTTHRUPUT
>    Current GC cycle time  . . . . . . . :               3021
>    Accumulated GC time  . . . . . . . . :             391790
</snip>