Date: Mon, 15 Mar 2004 23:59:15 -0700 From: <soralx@cydem.org> To: matrix@itlegion.ru, oceanare@pacific.net.sg Cc: freebsd-hardware@freebsd.org Subject: Re: Multiprocessor system VS one processor system Message-ID: <200403152359.15768.soralx@cydem.org> In-Reply-To: <026901c40b22$2c557c50$0c00a8c0@artem> References: <CD1C1AC62C4DA944914E36E7B3DD904313DB17@sestosrv004p.ad.octapharma.se> <40568DC4.7020209@pacific.net.sg> <026901c40b22$2c557c50$0c00a8c0@artem>
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> 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. There is also a context switching overhead for single CPU, isn't there? And, if you're talking about P4's - yes, they have larger L2 cahce, but their L1 cache is smaller compared to PIII's. When working simultaneously on dual-CPU system, 2 separate processes can store more of their own data in the faster L1 cache. Timestamp: 0x4056A434 [SorAlx] http://cydem.org.ua/
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