Author: Vincent Diepeveen
Date: 07:12:05 01/07/05
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On January 07, 2005 at 10:06:47, Vincent Diepeveen wrote: >On January 07, 2005 at 08:12:23, Steve Coladonato wrote: > >>On January 07, 2005 at 02:43:29, Richard A. Fowell wrote: >> >><snip> >>>Porting a full program (GUI and all) is a big project - when >>>Chessmaster 9000 was ported to the Mac this year, it took six >>>months longer than originally announced. >>> >>Is not the Mac OS Unix? And if so, why not a port to Linux? >> >>Steve >><snip> > >Not at all. Mac OS is a development based upon (free)bsd. That is very ==> Mac OSX i mean of course to be clear. Not the older selfdeveloped operating system that apple developed themselves. a problem of freebsd used to be it has no good multithreading capabilities. All threads run at 1 processor. Not at 2. Now that is not a major problem for apple as their users are typical not highend users. Yet the G5 is not so bad like most people guess it is. It is only 'relative' bad. Bad if you calculate the price per chessposition a second it sees compared to other systems. So for those paying bigtime the G5 is pretty fine. G5 is a lowend version with very little cache and higher clocked than the power5 from IBM. Power5 is very impressive for floating point. But very poor for integer work. In fact it is so poor they don't even test it at integer workloads. The sad part is that there is AFAIK no quad mac's. Only duals you might be able to buy and i haven't heard of multicore g5's either, despite power5 being multicore having a lot of cores per cpu. So the speed of power5 is based upon something the g5 doesn't have AFAIK. the g5 is nowhere benchmarked. Yet those cache eating benchmarks are not so important for chess. For chess raw performance of the cpu integer is important and latency to L1 cache and branch prediction penalty and throughput from L1 to cpu. The rest matters a lot less. Vincent
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