Date: Sun, 25 Nov 2007 22:18:07 +0100 From: Roman Divacky <rdivacky@freebsd.org> 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: <20071125211807.GA12250@freebsd.org> 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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On Sun, Nov 25, 2007 at 02:41:35PM -0600, Stephen Montgomery-Smith wrote: > > > On Sun, 25 Nov 2007, Robert Watson wrote: > > >........................ > >In FreeBSD 8, I expect we'll see a continued focus on both locking > >granularity and improving opportunities for kernel parallelism by better > >distributing workloads over CPU pools. This is important because the > >number of cores/chip is continuing to increase dramatically, so MP > >performance is going to be important to keep working on. That said, the > >results to date have been extremely promising, and I anticipate that we > >will continue to find ways to better exploit multiprocessor hardware, > >especially in the network stack. > > > > 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! pure computation does not need kernel operations most of the time.. ie. multi-threading kernel wont help much ;)
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