Date: Fri, 24 Oct 2003 14:11:53 -0700 (PDT) From: Ted Unangst <tedu@stanford.edu> To: Michel TALON <talon@lpthe.jussieu.fr> Cc: freebsd-hackers@freebsd.org Subject: Re: Some mmap observations compared to Linux 2.6/OpenBSD Message-ID: <Pine.GSO.4.44.0310241406390.6538-100000@saga0.Stanford.EDU> In-Reply-To: <20031024112740.GA20599@lpthe.jussieu.fr>
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On Fri, 24 Oct 2003, Michel TALON wrote: > What is more interesting is to look at the actual benchmark results in > http://bulk.fefe.de/scalability/ > in particular the section about mmap benchmarks, the only one where > OpenBSD shines. However as soon as touching pages is benchmarked > OpenBSD fails very much. look closer. openbsd's "touch page" times are identical to what you'd expect a disk access to be. the pages aren't cached, they're read from disk. so compared to systems that don't read from disk, it looks pretty bad. a 5 line patch to fix the benchmark so that the file actually is cached on openbsd results in performance much in line with freebsd/linux. -- "People have criticized me because my security detail is larger than the president's. But you must ask yourself: are there more people who want to kill me than who want to kill the president? I can assure you there are." - M. Barry, Mayor of Washington, DC
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