Date: Mon, 26 Nov 2007 09:31:14 +0100 From: "Johan Bucht" <jbucht@gmail.com> To: "Stephen Montgomery-Smith" <stephen@math.missouri.edu> Cc: binto <binto@triplegate.net.id>, freebsd-hackers@freebsd.org, Robert Watson <rwatson@freebsd.org>, Girwatson@freebsd.org Subject: Re: Before & After Under The Giant Lock Message-ID: <947010c30711260031w10689412w5f5ce56abc1fbe56@mail.gmail.com> In-Reply-To: <20071125143546.V6583@cauchy.math.missouri.edu> References: <474830F9.90305@zirakzigil.org> <6eb82e0711240638g2cc1e54o1fb1321cafe8ff9f@mail.gmail.com> <1188.202.127.99.4.1195957922.squirrel@webmail.triplegate.net.id> <20071125110116.U63238@fledge.watson.org> <20071125143546.V6583@cauchy.math.missouri.edu>
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2007/11/25, Stephen Montgomery-Smith <stephen@math.missouri.edu>: > > > I just want to add my 2 cents, that my recent experience with FreeBSD MP > has been extremely positive. I tend to use highly CPU bound MP programs, > typically lots and lots of floating point operations. It used to be that > Linux beat FreeBSD hands down - now FreeBSD seems to have a slight edge! > Basically my program runs about twice as fast when I run two threads as > opposed to one - I cannot see doing any better than that! Actually, some worksets can get a higher speedup since you usually double your cache size going from one to two cpus (core 2 duo has a shared cache). Should the problem be big enough not to fit in one cpu's cache but small enough to fit in two cpu's caches, you can get more than 2 times speedup. /Johan
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