lkml.org 
[lkml]   [2003]   [Aug]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: LMbench as gcc performance regression test?
Daniel Jacobowitz wrote:
> On Sun, Aug 31, 2003 at 12:21:37AM -0700, Dan Kegel wrote:
>
>>http://cs.nmu.edu/~benchmark/ has an interesting little graph
>>of LMBench results vs. Linux kernel version, all done with the
>>same compiler.
>>
>>Has anyone seen a similar graph showing LMBench results vs. gcc version,
>>all done with the same Linux kernel?
>>And does everyone agree that's a meaningful way to compare the
>>performance of code generated by different compilers?
>
> It's been a while since I looked at lmbench but: why do you think this
> would be useful? It's a system and kernel benchmark; I doubt
> optimization makes much difference at all.

I need to make sure that moving to a newer compiler for our kernel
will cause no performance regressions. Before bothering to bring up a
real-world networking application and measuring its performance
under the new compiler, it seems sensible to use a couple microbenchmarks
to verify that identifiable parts of the system have
not degraded in performance.

I myself am quite convinced I need to move to a newer compiler,
since I keep running into problems building various things with
old compilers, but my users are very conservative and skeptical;
I have to build a solid case for updating. Hence the insane amount
of time I spent figuring out and documenting how to build and test
the various versions of gcc and glibc (http://kegel.com/crosstool),
and then understanding the regression test failures.
- Dan

--
Dan Kegel
http://www.kegel.com
http://counter.li.org/cgi-bin/runscript/display-person.cgi?user=78045

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:48    [W:0.140 / U:0.260 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site