Author: Dann Corbit
Date: 15:17:32 04/13/01
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On April 13, 2001 at 17:45:10, Vincent Diepeveen wrote: >Hello, > >gcc in past always was very slow for me. 2.95.2 especially was >at a PIII-cumine core around 10.8% slower. Note Xeons seem not >made from the same core so always were slower as celeron and PIII >for me. > >PIII itself nearly 20% faster as PII katmai core. Xeon 7% faster as PII >and celeron 7.5% faster. > >However that's all single cpu measured. >When running dual then very interesting is the size of the >program in the L1,L2 caches (when talking about DIEP that is). > >Single cpu gcc 2.95.3 is only 8% slower as visual c++ 6.0 sp5 now. >Using compile options: > -O5 -march=pentiumpro -mcpu=pentiumpro -fno-gcse -fforce-mem > >note -mcpu=pentiumpro might be not needed as march might already >mean that. > >Now if i take the exact same executable and compare it with 2.95.2, >then the executable is 100kb smaller!! > >I was very happy about it but it started to amaze me when i >started running it. > >Of course when running parallel it's very hard to measure very exactly >differences. So i did some quite long testruns and compared at the >same depth the nodes a second that visual and gcc got. > > gcc 2.95.3 : 68311 > msvc 6.0 sp5 : 70110 > >Now THAT is amazing as it is even from head only about >3% difference in speed. > >Hardware used was my dual 800PIII. 256mb ram and hashsize i chose was 150mb. >In the test no EGTBs were loaded. > >So GCC is getting better again! HIEP HIEP HORAY! If you are using Cygwin, it comes with a 12 ton caveat: You have to PAY to redistribute commercial applications that use Cygwin! I don't know of PGCC or any of the others have this awful restriction, but it deserves looking into. See (for instance): http://sources.redhat.com/cygwin/cygwin-ug-net/are-free.html !!! Welcome to the world of free software. It's like that 'Fram' add -- "You can pay me now, or pay me later."
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