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gcc speed
- To: Linux/AXP <axp-list at redhat dot com>, egcs mailing list <egcs at cygnus dot com>
- Subject: gcc speed
- From: Jochen Kuepper <jochen at uni-duesseldorf dot de>
- Date: Fri, 5 Mar 1999 13:57:00 +0100
- Organization: Heinrich-Heine-Universitaet
Citing from http://www.cs.utk.edu/~rwhaley/ATLAS/errata.html:
Dec ALPHA compilers
If you are using a DEC Alpha, it is extremely important to use gnu gcc,
rather than egcs gcc. On my 533Mhz Dec ALPHA, using egcs 1.1.1 and gnu gcc
2.8.1, gcc provides roughly 590 Mflop DGEMM, whereas egcs results in 520 or
so. User's of DEC unix should be aware that cc should not be used to compile
the generated code. The compiler does not allow the turning off of
optimizations that cause optimal code to run slower, so you should compile
these routines with gcc.
[snip]
What do you think about that. Has anybody else some numbers to compare ?
Greetings,
Jochen
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Jochen Küpper
Heinrich-Heine-Universität Düsseldorf jochen@uni-duesseldorf.de
Institut für Physikalische Chemie I
Universitätsstr. 1, Geb 26.43 Raum 02.29 phone ++49-211-8113681
40225 Düsseldorf fax ++49-211-8115195
Germany http://www-public.rz.uni-duesseldorf.de/~jochen
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