Author: Russell Reagan
Date: 23:37:37 12/16/03
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On December 17, 2003 at 01:20:48, Russell Reagan wrote: >With the Windows Intel C++ compiler, others have been able to get much faster >speeds than I can get with the Linux Intel C++ compiler. In one case, we used >the same make target on the same hardware, and got significantly different >speeds (I got 754 Knps, he got 960 Knps). > >I am also unable to get both PGO and IPO to work together with Crafty so far, >but I was able to get it to work for something simpler (TSCP) for a 30% speed >increase over using only one or the other. Maybe getting both of these to work >together for Crafty is the key. > >So far I've only managed to either break the make file, or get compiler errors >if I try to compile it on the command line :) Aha! I figured out my mistake, and the number I reported above was wrong (754 Knps was with gcc). The default linux-icc target, which only does PGO, gets 809 Knps. After I got PGO and IPO to work together, the speed went up to 896 Knps (roughly 10-11% increase). Still, I am unable to get numbers like 960 Knps on my Athlon XP 2400+ (2GHz). I also wonder why PGO and IPO are not both used in the default make target of linux-icc, since it gives another 10% for free. I only had to change about three lines.
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