Date: Thu, 31 Dec 2015 13:32:02 -0500 From: "Jonathan T. Looney" <jtl@freebsd.org> To: Allan Jude <allanjude@freebsd.org>, Bruce Evans <brde@optusnet.com.au> Cc: <src-committers@freebsd.org>, <svn-src-all@freebsd.org>, <svn-src-head@freebsd.org> Subject: Re: svn commit: r292955 - head/lib/libmd Message-ID: <D2AADE36.4E8D4%jlooney@juniper.net> In-Reply-To: <5684D606.3080609@freebsd.org> References: <201512301804.tBUI4oGp065466@repo.freebsd.org> <20151231115651.R995@besplex.bde.org> <20151231143314.Y1520@besplex.bde.org> <5684D606.3080609@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On 12/31/15, 2:15 AM, "Allan Jude" <allanjude@freebsd.org> wrote: >It seems these problems also slow things down, a lot: > ># time md5 /media/md5test/bigdata >MD5 (/media/md5test/bigdata) = 6afad0bf5d8318093e943229be05be67 >4.310u 3.476s 0:07.79 99.8% 20+167k 0+0io 0pf+0w ># time env LD_PRELOAD=/usr/obj/media/svn/md5/head/tmp/lib/libmd.so >/usr/obj/media/svn/md5/head/sbin/md5/md5 /media/md5test/bigdata >MD5 (/media/md5test/bigdata) = 6afad0bf5d8318093e943229be05be67 >4.133u 0.354s 0:04.49 99.7% 20+167k 1+0io 0pf+0w > >(file is fully cached in ZFS ARC, dd reads it at 11GB/s) > >Will investigate more tomorrow. md5 will be slower than dd due to the extra processing it needs to do to generate the hash. I suspect that explains the difference you're seeing between those utilities. Jonathan
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?D2AADE36.4E8D4%jlooney>