Why are Background WPs kill/restarting very often?

Hi
We have a NW2004s ABAP/JAVA system installed on Solaris x86 (HP AMD/Opeterons) Oracle 10.2. Our systems are installed in Solaris Zones.
Background WPs kill/restart on a regular basis (eg. up to 10 - 12 times/day) after exceeding the ABAP/HEAPLIMIT.
     A  WP has reached abap/heaplimit = 80000000 bytes
     M
     M Sun Aug 12 20:00:54 2007
     M  ThNeedWpRestart: abap strategy == kill, restart
     M  ThWpRestart: restart wp (pid=5724) automatically
This does not seem to correspond to an error occuring and I realise that kill/restart is the correct action when the HEAPLIMIT is execeded.
The question is therefore 'why we are exceeding the HEAPLIMIT value when we are running very little on the system' The processes that are restarting are not handling jobs that are running for a long time..
I have doubled the HEAPLIMIT at SAP recommendation from 40000000 to 80000000 but still no difference. Other than the HEAPLIMIT change the other SAP params are defaults.
Has anyone else seen this happening, specifically in the Solaris environment?
Regards, Billy

Hi Billy
I think you already know now, that abap/heaplimit controls after what amount of memory consumption a (batch) workprocess will be restarted.
>> Why did your change from 40mb to 80mb not change anything?
I guess there is a typical workload which often uses more then 80mb, so either the 40mb and the 80mb limit cause the process to restart.
>> Why is this parameter needed at all?
The reason is that batch workprocesses do allocate memory from the so called heap, which is private memory (opposite to shared memory). Only the one process can use this memory and it is free by killing this process.
So if you increase the limit further (until abap/heap_area_nondia at max) you will see less process restarts but more memory consumption from your heap (abap/heap_area_total) which is in fact physical memory at the end. You should not be worried to much of several restarts of a process per day. I would consider more than one restart per hour too much.
Best regards
Michael

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