Date: Tue, 16 Mar 2004 09:36:17 +0300 From: "Artem Koutchine" <matrix@itlegion.ru> To: "Erich Dollansky" <oceanare@pacific.net.sg> Cc: freebsd-hardware@freebsd.org Subject: Re: Multiprocessor system VS one processor system Message-ID: <026901c40b22$2c557c50$0c00a8c0@artem> References: <CD1C1AC62C4DA944914E36E7B3DD904313DB17@sestosrv004p.ad.octapharma.se> <002f01c4081c$bd720810$0c00a8c0@artem> <40568DC4.7020209@pacific.net.sg>
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> > of processes with short run periods you will get overal > > perfomance somewhere near 5000Mhz. However, when i > > subsituted two 500Mhz CPUs with 1500Mhz one (even with > > less 2nd level cache) on a heavy loaded web server i notice > > that sites started to load faster. So, it seems as > > one 3X Mhz CPU is faster that two X MHz CPUs, at least > > for web server with sql base and many perl scripts. > > > This is true as long there is no load until the CPU cache comes > into the game. It also depends on how the CPUs are connected to > the main memory. Hm.. Let me make up a case. Two boxes: 1) Dual CPU X Mhz with Y KB of cache 2) Sinnge CPU with 2X Mhz and 2Y KB of cache Which one is faster under FreeBSD? I think the second one, because SMP overhead is gone. Artem
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