RE: Performance on DUAL processor

> I installed SAP on a xeon dual processor usig linux (debian 3.0r1)
> 
> watching the performance of each processor I notice that sap 
> doesnt use both processor but 1 at time
> if one of the processors reach 100% the it start using the other

Check the kernel parameters _TASKCLUSTER_01 / 02 / 03. 
If one of these contains the string 'compress' (which is
the default for MAXCPU == 1), then the behaviour is understandable.

Change this value to 'equalize', this will distribute sessions among
UKTs (User Kernel Thread) evenly.

If the value is already set to 'equalize', then try the following:
dbmcli -d ... -u ... show process
Important are the columns UKT and TASK, not all of the User-TASKS
should have the same UKT number. Other tasks types are
handled differently, so don't worry if some tasks have a
private UKT.

If the sessions are indeed distributed among the TASKS,
then there is always the possibility that the Linux 
threading library doesn't distribute the threads among the CPUs.

Daniel Dittmar

-- 
Daniel Dittmar
SAP DB, SAP Labs Berlin
daniel.dittmar@xxxxxxx
http://www.sapdb.org/

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