topic Re: RHEL3 reduce PTHREAD_STACK_MIN in Operating System - Linux

RHEL3 reduce PTHREAD_STACK_MIN

Aaron_125 — Wed, 05 Oct 2005 12:57:46 GMT

Is anyone familiar with how to reduce the value for PTHREAD_STACK_MIN. Running RHEL3 2.4.21-20.ELsmp getconf shows a value of 16384. thnx -

Re: RHEL3 reduce PTHREAD_STACK_MIN

Steven E. Protter — Wed, 05 Oct 2005 13:26:15 GMT

Most kernel changes are made by making echo statements into the appropriate /proc directory.

Under certain cirumstances the kernel may need to be recompiled.

You should make sure there are not dependency values in the kernel before making changes. I'm curious as to why you wish to make this change.

SEP

Re: RHEL3 reduce PTHREAD_STACK_MIN

Ivan Ferreira — Wed, 05 Oct 2005 14:04:06 GMT

Why do you need to reduce the value?

I did not found any entries in the /proc filesystem that may allow the change of the value. You may need to edit the kernel source and recompile the kernel.

Re: RHEL3 reduce PTHREAD_STACK_MIN

Aaron_125 — Wed, 05 Oct 2005 14:12:54 GMT

Thanks guys - we'd like to test with lower min thread size because we believe the app may not require the full min. If we reduced to 8000 and have a couple hundred threads memory usage savings wouldn't be huge but couldn't hurt. Looks like the default PTHREAD_STACK_MIN value for 2.4 and 2.6 kernels is 16384 and wonder if this is an optimized value and changing it could cause system perf degradation/issues..?

Re: RHEL3 reduce PTHREAD_STACK_MIN

Ivan Ferreira — Wed, 05 Oct 2005 14:41:19 GMT

I think that as is not a tunable parameter, should be optimized. Anyway, you can more or less restric the values using ulimit.