Author: Robert Hyatt
Date: 15:16:15 12/04/01
Go up one level in this thread
On December 04, 2001 at 14:40:42, Andrew Dados wrote: >On December 04, 2001 at 11:56:59, Robert Hyatt wrote: > >>On December 04, 2001 at 04:04:37, Jonas Cohonas wrote: >> >>>On December 03, 2001 at 22:11:59, K. Burcham wrote: >>> >>>> >>>> >>>>it seems you got about a 30% speed up in this example, even though it misses the >>>>move. >>>>also my task manager shows that deep fritz is using 100% of both processors. >>>> >>>>but what really bothers me---if i log into the fritz7 server, even though >>>>the software is running everything, time etc., it is still using my engine >>>>in my pc for the game. so i dont understand the big speedup at fritz7 server. >>>> >>>>kburcham >>> >>>I got a big speedup with DF on the F7 server in the first game played, after >>>that it was back to "normal". There must be a bottleing up of something in DF >>>because the speedup almost get's worse for each game. >>> >>>It would be nice with an upgrade that would fix tthis. BTW i spoke to a guy at >>>the F7 server who were testing a beta version of DF7 and he said he got a 35% >>>speedup. >>> >>>To anyone who would be qualified to answer this: could the lack of or poor >>>speedup be caused by the fact that DF was written so it could be used with 1 >>>processor too? >>> >>>Regards >>>Jonas >> >> >>I don't see how. IE the SMP version of crafty will use one or two or four >>cpus with no problems. And the SMP version is roughly .005% slower than the >>non-SMP version when run on a single processor. The only reason I distribute >>two versions of crafty executables (SMP and non-SMP) is to prevent someone from >>using the SMP version on a single cpu, and telling it to use two threads. That >>will absolutely kill performance. > >Can't you just auto-detect this? Most OSes provide cpu number easily. >-Andrew- Yes, but users typically don't like it. First, there is no ANSI compliant way to determine the number of processors, so it becomes a portability issue. Second, in many cases users don't want the machine to "see two and use two" automatically (some programs did this in the past and it caused a lot of complaints.) For me the issue is portability above all else...
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