Author: David Dory
Date: 02:33:13 01/16/02
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On January 15, 2002 at 16:31:44, John Hatcher wrote: >I just installed a new video card and, quite unexpectedly, I found that all my >chess engines (using the Fritz interface) are reporting significantly higher >knps during analysis - in the range of 50% faster knps. > >The video upgrade was a modest one - from onboard INTEL AGP (8mb shared) to a >ATI Xpert 128 (16mb). The computer is a 333mhz Celeron with 294MB memory. > >Does this make any sense? How does upgrading video increase knps of a chess >engine? Does it? > >Thanks: JOHN *** Every single time *** your program writes something to the screen, be it a clock (second) change, a nps rating, or anything at all, it slows your program down. The slower your video card, the more it slows it down (in my limited testing, anyway). A few years back a friend with a slow computer came to me complaining of his latest little game's bad performance. Sure enough, he'd decided to include a timer for every single task in the game. (So you wound up with 4 - 5 timers all running simultaneously) You wouldn't believe the (negative) impact such things as timers & nps counters have on CPU intensive programs. Dave
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