Author: Robert Hyatt
Date: 19:47:15 12/04/01
Go up one level in this thread
On December 04, 2001 at 18:52:30, Andrew Dados wrote: >On December 04, 2001 at 18:16:15, Robert Hyatt wrote: > >>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... > >adding one line like that: > >if windoze and numprocessors==1 and numthreads!=1 warn 'get dual or i'll use >your VGA processor'; > >is not that bad idea imo... most kids who can't edit a config file are on >windows. >.. And I won't be seeing that 'Hello from Crafty (1 cpus)' :) > >-Andrew- The problem is that there is no global "numprocessors" variable. That is something that is not included in any ANSI specs which means it is different on every operating system, and even changes between versions... Trying to support that is a _real_ pain...
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.