Date: Thu, 15 Aug 2013 22:29:24 +0200 From: Ivan Voras <ivoras@freebsd.org> To: Colin Percival <cperciva@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r254380 - in head/sys: kern sys Message-ID: <CAF-QHFXXxQC69djweY7mK1tjbTSNxTPh1=-FxUeyz1nr_0WdHQ@mail.gmail.com> In-Reply-To: <201308152019.r7FKJI0H095440@svn.freebsd.org> References: <201308152019.r7FKJI0H095440@svn.freebsd.org>
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On 15 August 2013 22:19, Colin Percival <cperciva@freebsd.org> wrote: > For workloads with R parallel reads and W parallel writes, this improves > the time spent from O((R+W)^2) to O(W*(R+W)); i.e., heavy parallel-read > workloads become significantly more scalable. > > No statistically significant change in buildworld time has been measured, > but synthetic tests of parallel 'dd > /dev/null' and 'openssl enc >/dev/null' > with the input file cached yield dramatic (up to 10x) improvement with high > (up to 128 processes) levels of parallelism. That's interesting. Have you tried running the "blogbench" benchmark before & after?
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