Author: Dan Newman
Date: 21:01:33 02/23/01
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On February 23, 2001 at 14:24:34, Dann Corbit wrote: >On February 23, 2001 at 13:46:07, James Swafford wrote: > >>Below are a couple quick tests I ran to compare executable speeds of one >>of my programs using MSVC 6 pro and the latest Cygwin. >> >>The tests were run on a Dell laptop running WinNT, 750 Mhz PIII, 512 mb ram. >> >>The first test was the WAC suite (first 100 problems) run at 10 sec/problem. >>The summary reports below show the avg node counts at the bottom. >> >>The second test is an internal bench command that runs the nolot test >>suite at 30 secs/problem, then computes avg nps. The function is >>attached below. Disregard the comparisons to the K6-2 and Athlon - >>I don't remember which compiler I used when I came up with those numbers, >>and the program has changed a bit since. >> >>Here's the summary: >>Test 1 (WAC 1-100 @ 10 sec.) >>cygwin: >> interior: 398622; frontier: 2429828 (node counts) >>msvc 6: >> interior: 384231; frontier: 2331737 >> >>Test 2 (nolot bench, 30 sec./problem) >>cygwin: >> mean node rate for benchmark -> 308177 n/s >>msvc 6: >> mean node rate for benchmark -> 293639 n/s > >I have never seen any program except a string operation test where GCC was >faster. Is this result from Galahad or from another program? > >Have you tried the Intel compiler? You can try a free download for 30 days. >Since you already have MS VC++ professional, it drops right into the IDE (in >fact MS VC++ Professional or Enterprise is required). > >Exactly what version of GCC were you using? I have gcc-2.95.2-6 and it is >usually 20-50% slower than MS VC++ and even worse when pitted with Intel. Heh. I bought the Intel compiler (version 5.0) on the basis of reports of better performance than MSVC, but on my program I get a 24% hit instead... I imagine what may happen is that if you optimize for one compiler, you end up doing worse on another. Generally I've found MSVC to be 20-30% better than anything else I've tried (Watcom, gcc, Intel). (It could be that I just haven't found the right switches yet.) The Intel compiler did find a few minor "bugs" that have been slipping past MSVC--got 4 warnings that really needed fixing--so it's not a total loss :). -Dan.
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