FC3 x86_64 math functions slowdown

Sun Jul 10 04:53:39 UTC 2005

D. Angelis wrote:
> I have noticed a significant (up to 5 times !!!) slowdown of some math
> functions in /lib64/libm.so.6 (glibc-2.3-5) shipped with FC3
> compared to the version (glibc-2.3.3) shipped with SuSe 9.1.

Very simple explanation: the other code uses non-standard math functions
which are optimized for the processor but don't produce the same
results.  Remember, I can arbitrarily fast compute wrong results.

-- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖

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