scunacc,

What version of AIX?

Background: If its AIX 6.1 or later, you may be working against the AIX dispatcher. Unix and Linux treat cores as CPUs, while AIX knows that the first core of the CPU is the fastest and the last core is the slowest. So as an example, let's say you have 8 CPUs with 6 core each. The AIX dispatcher will always want the first core of each CPU working the most and then the next level and so on.

You may want to search on this since I seem to remember that in AIX you may get better performance by limiting the number of active threads, so they execute on the faster cores. Also, I believe I/O bound threads are dispatched on the slower cores and CPU intensive on the faster cores.

I believe the 'xlc' compiler is designed to help C/C++/Fortran programs, but Perl is on it's own. And if your Perl was built with 'gcc' you may be in an even worse situation.

I don't know if this will help, but maybe the information will give you a different approach to the problem.

Regards...Ed

"Well done is better than well said." - Benjamin Franklin

In reply to Re: Multithreaded process on AIX slow by flexvault
in thread Multithreaded process on AIX slow by scunacc

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