topic Re: Slow execute RHEL5.4's malloc & free in Operating System - Linux

Slow execute RHEL5.4's malloc & free

greyfox — Thu, 17 Feb 2011 05:01:41 GMT

Slow execution RHEL5.4's malloc&free

When malloc & free executing in cyclic,
RHEL5.4 is slower (about 40times) than
RHEL4.7.

I guess malloc(glibc) thechnical enhance on RHEL5.4, so 2 environmental variables set,
but still slow..

MALLOC_ARENA_MAX=32
MALLOC_PER_THREAD=1

Anyone has any ideas what we need to faster?

Thanks

greyfox

Re: Slow execute RHEL5.4's malloc & free

greyfox — Thu, 17 Feb 2011 05:04:12 GMT

miss type: thechnical -> techinical

Re: Slow execute RHEL5.4's malloc & free

greyfox — Thu, 17 Feb 2011 09:04:12 GMT

I apologize for the strike mistake of two times. Correctness is "technical".

Re: Slow execute RHEL5.4's malloc & free

dirk dierickx — Fri, 18 Feb 2011 08:32:49 GMT

that is an interesting find, doesn't show in normal usage though that malloc/free is 40x slower and it normally should because those calls are made a lot.

report this to redhat, i'm sure they'll be interested in hearing about it.

Re: Slow execute RHEL5.4's malloc & free

greyfox — Mon, 21 Feb 2011 07:21:37 GMT

Thanks for your reply, Dierickx.

Today, I tested after install glibc-utils package as listed in bugzilla.
Though RHEL4.7AS is 70sec, RHEL5.4S is still 1,050sec(NOT enough).

As you said, I request it from the support of RedHat.

The result develops here.

Thanks

greyfox