Date: Fri, 20 Jul 2007 15:03:37 -0700 From: James Long <list@museum.rain.com> To: freebsd-questions@freebsd.org Subject: speed of bzip2 versus gzip Message-ID: <20070720220337.GA87174@ns.umpquanet.com>
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Is it normal for bzip2 to be significantly slower than gzip? If not, where can I look for things that might be causing "bzip2 --fast" to take 50-60 times longer to compress a (sendmail log) file than gzip? Thanks, Jim > ns : 07:52:06 /usr/tmp# time bunzip2 -c /var/log/maillog.0.bz2 > maillog > > real 1m43.574s > user 1m26.846s > sys 0m15.284s > ns : 07:53:55 /usr/tmp# time gzip -c maillog > maillog.0.gz > > real 1m1.092s > user 0m49.009s > sys 0m6.682s > ns : 07:56:56 /usr/tmp# time bzip2 -c maillog > maillog.0.bz2 > load: 1.00 cmd: bzip2 53621 [running] 1860.55u 1.82s 98% 8096k > load: 1.00 cmd: bzip2 53621 [running] 5386.71u 5.30s 98% 8096k > > real 133m25.236s > user 131m29.156s > sys 0m7.744s > ns : 10:10:36 /usr/tmp# time gzip -c maillog > maillog.1.gz > > real 1m1.208s > user 0m52.356s > sys 0m3.333s > ns : 10:12:13 /usr/tmp# ls -l > total 1576688 > -rw-r--r-- 1 root wheel 1590291797 Jul 20 07:53 maillog > -rw-r--r-- 1 root wheel 1845620 Jul 20 10:10 maillog.0.bz2 > -rw-r--r-- 1 root wheel 10761511 Jul 20 07:56 maillog.0.gz > -rw-r--r-- 1 root wheel 10761511 Jul 20 10:12 maillog.1.gz > ns : 10:12:17 /usr/tmp# time bzip2 -1 -c maillog > maillog.1.bz2 > load: 1.02 cmd: bzip2 62522 [running] 3073.92u 8.02s 98% 1836k > > real 55m48.149s > user 54m40.118s > sys 0m8.028s > ns : 11:08:34 /usr/tmp# ls -l > total 1586944 > -rw-r--r-- 1 root wheel 1590291797 Jul 20 07:53 maillog > -rw-r--r-- 1 root wheel 1845620 Jul 20 10:10 maillog.0.bz2 > -rw-r--r-- 1 root wheel 10761511 Jul 20 07:56 maillog.0.gz > -rw-r--r-- 1 root wheel 10474338 Jul 20 11:08 maillog.1.bz2 > -rw-r--r-- 1 root wheel 10761511 Jul 20 10:12 maillog.1.gz
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