Date: Sun, 11 Mar 2007 15:22:26 -0700 From: Tim Kientzle <kientzle@freebsd.org> To: current@freebsd.org Subject: Bsdtar performance Message-ID: <45F48122.7030309@freebsd.org> In-Reply-To: <45F46291.4090209@freebsd.org> References: <200703111036.l2BAaha6031394@repoman.freebsd.org> <45F46291.4090209@freebsd.org>
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Tim Kientzle wrote: >> kientzle 2007-03-11 10:36:43 UTC >> FreeBSD src repository >> bsdtar 2.0.23: >> * read.c now relies on security checks in libarchive instead >> of trying to do its own... > > Bsdtar should now be considerably faster than before. > I put a lot of effort over the last few months into > streamlining the code in libarchive to recreate objects > on disk. Here are some initial test results for bsdtar 2.0.22. This test extracts an uncompressed ustar version of "base.tgz" from a 5.3 distribution CD to a blank 300MB malloc-backed disk on a single-processor i386 system with 1G physical RAM. bsdtar -xPf: 1.53 seconds gtar-1.13.25: 1.57 seconds gtar-1.15.1: 1.58 seconds bsdtar -xf: 1.59 seconds gtar-1.16.1: 1.61 seconds star: 1.82 seconds I used /usr/bin/time <program> -xf ~/base.ustar and ran each program at least 10 times, discarded the outliers and averaged the rest. (The user time varied quite a bit, interestingly enough.) Obviously, these results should vary dramatically depending on the hardware ane the archive being tested (mix of dirs, small files, large files, etc), so I'm very eager to see results from other people (especially any where bsdtar performs poorly). Tim Kientzle P.S. to create a ustar version of the 5.3 distribution, use bsdtar as a format-conversion filter: cat base.?? | bsdtar -cf ~/base.ustar --format=ustar @-
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