hi ! is it planned to add this lzo patch to tar ?
if not, you maintainers should really consider doing so - lzo compression is just great and lzop is quite portable, maybe even like gzip and bzip2 here are some "real world" benchmarks for comparison: time tar cqf|czf|cjf test.dat.lzo|.gz|.bz2 test.dat lzo: real 0m27.507s user 0m5.824s sys 0m4.170s gzip: real 0m47.059s user 0m30.969s sys 0m3.524s bzip: real 4m36.405s user 4m6.958s sys 0m2.913s filesizes: test.dat 500M test.dat.tar.lzo 93M test.dat.tar.gz 62M test.dat.tar.bz2 51M as you can see, lzo compresses much faster and much, much more cpu friendly, unfortunately giving worse compression - but - reducing 500M down to 93M is still "good enough". regards roland (sysadmin, using lzop for years and thinking that it`s time for having lzo support in tar ;) [Bug-tar] PATCH: Lzo compression support Kevin Day Tue, 27 Mar 2007 04:48:27 -0800 I found LZO to be as useful and open-source friendly as gzip and bzip2. For those wondering: http://www.lzop.org/ and http://www.oberhumer.com/opensource/lzo/ Here is the patch (tested and working) to make this a possible addition to tar To my surprise, there were still letters available, i picked 'q'. --- tar-1.16.1/src/buffer.c.orig 2006-12-30 10:40:59.000000000 -0600 +++ tar-1.16.1/src/buffer.c 2006-12-30 11:54:33.000000000 -0600 @@ -196,7 +196,8 @@ ct_none, ct_compress, ct_gzip, - ct_bzip2 + ct_bzip2, + ct_lzop }; struct zip_magic @@ -213,6 +214,7 @@ { ct_compress, 2, "\037\235", "compress", "-Z" }, { ct_gzip, 2, "\037\213", "gzip", "-z" }, { ct_bzip2, 3, "BZh", "bzip2", "-j" }, + { ct_lzop, 4, "\211LZO", "lzop", "-q" }, }; #define NMAGIC (sizeof(magic)/sizeof(magic[0])) --- tar-1.16.1/src/tar.c.orig 2006-12-30 10:41:04.000000000 -0600 +++ tar-1.16.1/src/tar.c 2006-12-30 12:06:10.000000000 -0600 @@ -572,6 +572,8 @@ N_("create archive with volume name TEXT; at list/extract time, use TEXT as a globbing pattern for volume name"), GRID+8 }, {"bzip2", 'j', 0, 0, N_("filter the archive through bzip2"), GRID+8 }, + {"lzop", 'q', 0, 0, + N_("filter the archive through lzop"), GRID+8 }, {"gzip", 'z', 0, 0, N_("filter the archive through gzip"), GRID+8 }, {"gunzip", 0, 0, OPTION_ALIAS, NULL, GRID+8 }, @@ -1340,6 +1342,10 @@ absolute_names_option = true; break; + case 'q': + set_use_compress_program_option ("lzop"); + break; + case 'r': set_subcommand_option (APPEND_SUBCOMMAND); break; -- Kevin Day _______________________________________________________________ SMS schreiben mit WEB.DE FreeMail - einfach, schnell und kostenguenstig. Jetzt gleich testen! http://f.web.de/?mc=021192
