> > $ time gtar -xjf > ~/Downloads/kde/KDEkderequired-341.tar.bz2 > > > > $ bzcat ~/Downloads/kde/KDEkderequired-341.tar.bz2 > | time tar -xf - > > It's dangerous compairing these two - in one you're > running time on the > entire decompress/untar process, whilst in the second > you're only time'ing > the untar. > > The "real" time _should_ be roughly the same for > both, but it's still > a very unscientific way of doing it. > > Start with an uncompressed archive, and try again. > You should also be > careful to make sure that any disk caching/etc > doesn't get in the way...
Okay, I did a more "scientific" test and uncompressed the archive first. Then I ran every version of tar at least twice (gtar three times b/c the first two runs were so different). I ran star at the end to make sure the results weren't getting slower over time, and star ran even faster than the initial runs, the clear winner by 36-48 seconds. Solaris tar placed second, with gnutar and bsdtar slightly (and unpredictably) slower than "tar". Another interesting thing to note is that star uses 50% more system time than Solaris tar, despite finishing faster. Since it is reading the same amount of data and creating the same destination files and directories, I'm curious why Solaris would take more CPU time to run star and yet finish faster. Time for me to practice my dtrace skills. Test system: 2.8GHz Pentium 4, 512MB DDR333 RAM, 120GB Seagate ST3120026A drive, OpenSolaris w/ JDS and 2 terminal windows open, bonnie++ gives read speed as 50588K/sec, write speed as 44935K/sec. -- Jake Hamby $ bzcat ~/Downloads/kde/KDEkderequired-341.tar.bz2 >KDEkderequired-341.tar $ sync $ time star xf KDEkderequired-341.tar star: 72176 blocks + 4608 bytes (total of 739086848 bytes = 721764.50k). real 2m53.636s user 0m1.280s sys 0m32.205s $ rm -r KDEkderequired-341 $ sync $ time star xf KDEkderequired-341.tar star: 72176 blocks + 4608 bytes (total of 739086848 bytes = 721764.50k). real 2m52.759s user 0m1.270s sys 0m32.265s $ rm -r KDEkderequired-341 $ sync $ time star -fifo -x -f KDEkderequired-341.tar star: 72176 blocks + 4608 bytes (total of 739086848 bytes = 721764.50k). real 2m50.476s user 0m1.284s sys 0m32.364s $ rm -r KDEkderequired-341 $ sync $ time star -fifo -x -f KDEkderequired-341.tar star: 72176 blocks + 4608 bytes (total of 739086848 bytes = 721764.50k). real 2m51.473s user 0m1.246s sys 0m32.482s $ rm -r KDEkderequired-341 $ sync $ time tar xf KDEkderequired-341.tar real 3m30.329s user 0m1.000s sys 0m21.336s $ rm -r KDEkderequired-341 $ sync $ time tar xf KDEkderequired-341.tar real 3m31.520s user 0m1.001s sys 0m21.403s $ rm -r KDEkderequired-341 $ sync $ time gtar xf KDEkderequired-341.tar real 3m35.212s user 0m1.000s sys 0m21.449s $ rm -r KDEkderequired-341 $ sync $ time gtar xf KDEkderequired-341.tar real 3m31.336s user 0m0.997s sys 0m21.249s $ rm -r KDEkderequired-341 $ sync $ time gtar xf KDEkderequired-341.tar real 3m34.473s user 0m1.012s sys 0m21.478s $ rm -r KDEkderequired-341 $ sync $ time bsdtar xf KDEkderequired-341.tar real 3m34.560s user 0m1.444s sys 0m29.968s $ rm -r KDEkderequired-341 $ sync $ time bsdtar xf KDEkderequired-341.tar real 3m36.310s user 0m1.434s sys 0m30.115s $ rm -r KDEkderequired-341 $ sync $ time star -fifo -x -f KDEkderequired-341.tar star: 72176 blocks + 4608 bytes (total of 739086848 bytes = 721764.50k). real 2m48.757s user 0m1.264s sys 0m32.515s This message posted from opensolaris.org _______________________________________________ opensolaris-discuss mailing list [email protected]
