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From:Tom Cunningham Date:June 25 1999 12:56pm
Subject:Re: glibc 2.1 performance
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On 24 Jun 1999, Paul D. Smith wrote:

> %% Tom Cunningham <tom@stripped> writes:
> 
>   tc> I went back through the archives and couldn't find anything about
>   tc> this, so I figured I'd pipe in. I've been having all sorts of
>   tc> problems the last couple of days benchmarking two machines. We
>   tc> have an old machine which runs Red Hat 5.2 (glibc-2.0.7-29), and a
>   tc> new machine which runs Red Hat 6.0 (glibc-2.1.1-6).
> 
> You forgot a _crucial_ bit of info: what kernels you're running.  There
> are some performance issues in most 2.2 kernels below 2.2.10, one good
> thing to come out of the latest Microsoft sponsored benchmark hullabaloo
> was some attention paid to these and some bugs fixed (Linus said, "it's
> all worth it since we found some bugs").
> 

The old machine (the one that performs better under heavy hits) is running
Linux 2.2.5. The new machine is running Linux 2.2.10ac4. The bug seems to
be in the glibc version, because we've tried 2.2.5 on the new machine, and
it didn't help performance - the old machine still outperformed the new
one even though they were both running the same kernel (2.2.5).

The Usenet post also seemed to point a finger at glibc2.1 :

http://x23.deja.com/getdoc.xp?AN=474851996&search=thread&CONTEXT=930262832.17345
41401&HIT_CONTEXT=930262265.1662714038&HIT_NUM=1&hitnum=1
Subject : performance bug in glibc2.1 linux 2.2?
Date: 1999/05/06

Is anyone else that is using Red Hat 6.0 willing to check this out, or has
anyone seen this happen? I really don't want to retreat to an earlier
glibc library if I don't have to.


Thread
Persistent connections to db?Tom Cunningham23 Jun
  • Re: Persistent connections to db?Paul DuBois23 Jun
    • Re: Persistent connections to db?Tom Cunningham23 Jun
      • Re: Persistent connections to db?Daniel Koch23 Jun
        • DBD::mysql fails on two tests?Tom Cunningham24 Jun
          • glibc 2.1 performanceTom Cunningham25 Jun
            • Re: glibc 2.1 performance(Paul D. Smith)25 Jun
              • Re: glibc 2.1 performanceTom Cunningham25 Jun
                • Re: glibc 2.1 performanceathompso28 Jun
    • Re: Persistent connections to db?ed23 Jun
Re: glibc 2.1 performanceAndrew Dunstan25 Jun