Date: Tue, 13 Apr 2004 11:10:06 -0700 From: Tim Kientzle <tim@kientzle.com> To: Tim Kientzle <tim@kientzle.com> Cc: current@freebsd.org Subject: Re: cvs commit: src/usr.bin/tar Makefile bsdtar.1 bsdtar.c bsdtar.h bsdtar_platform.h matching.c read.c util.c write.c Message-ID: <407C2CFE.1010009@kientzle.com> In-Reply-To: <407C2924.2050503@kientzle.com> References: <200404090121.i391LRlr096539@green.homeunix.org> <407C2924.2050503@kientzle.com>
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Tim Kientzle wrote: > Brian F. Feldman wrote: > >> ... it should be possible to get more speed out of bsdtar ... > > Libarchive ... always writes fixed-size blocks, but you > can at least set the block size ... Since the library calls a client-provided write routine for each block, you should also be able to set up async writes and get some I/O overlap that way. (In particular, this might speed up operations like tar -cf - foo | tar -xf - -C /mnt to copy dir heirarchies across drives.) Of course, libarchive reuses it's block buffer, so you would have to copy the data out before starting the I/O and returning. Hmmmm.... There's no reason libarchive couldn't use a round-robin list of block buffers internally if that would help. Tim
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