Date: Mon, 09 Feb 2015 08:41:42 -0800 From: Rui Paulo <rpaulo@me.com> To: John Baldwin <jhb@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, Rui Paulo <rpaulo@freebsd.org> Subject: Re: svn commit: r278433 - in head: . contrib/xz contrib/xz/src/common contrib/xz/src/liblzma contrib/xz/src/liblzma/api contrib/xz/src/liblzma/api/lzma contrib/xz/src/liblzma/check contrib/xz/src/liblz... Message-ID: <663179A3-95DD-4BC2-B645-1187CCF0DAA3@me.com> In-Reply-To: <46013627.EoFa6fsn0l@ralph.baldwin.cx> References: <201502090620.t196KZSk040702@svn.freebsd.org> <46013627.EoFa6fsn0l@ralph.baldwin.cx>
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On Feb 9, 2015, at 08:16, John Baldwin <jhb@freebsd.org> wrote: > > On Monday, February 09, 2015 06:20:35 AM Rui Paulo wrote: >> Author: rpaulo >> Date: Mon Feb 9 06:20:34 2015 >> New Revision: 278433 >> URL: https://svnweb.freebsd.org/changeset/base/278433 >> >> Log: >> Merge xz 5.2.0. >> >> This brings support for multi-threaded compression. This brings close >> N times faster compression where N is the number of CPU cores. >> Because of this, liblzma now depends on libthr. >> >> Soon libarchive will be modified to use the new lzma API. >> >> Thanks to antoine@ for the exp-run. > > It looks like this uses hw.ncpu to determine the number of cores. Can you > make this cpuset friendly by querying the current process's CPU mask and > counting the cores it contains instead? > > Somethign like: > > cpuset_t set; > > cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1, &set, sizeof(set)); > > (I have a CPU_COUNT() macro I should commit that will then let you do:) > > ncpus = CPU_COUNT(&set); Yes, makes sense. I'll wait for CPU_COUNT(). -- Rui Paulo
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