Re: LMbench as gcc performance regression test?
From: Dan Kegel (dank_at_kegel.com)
Date: 08/31/03
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Date: Sun, 31 Aug 2003 08:59:10 -0700 To: Daniel Jacobowitz <dan@debian.org>
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/
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