Re: Parallel GZIP

["Nelson Castillo" <nelsoneci@gmail.com>]

>> Anyone has better results ?
> Yes, see following:
>
> jackyf@work:~/temp$ time tar -cjf temp1.tar.bz2 debian
>
> real    0m18.830s
> user    0m18.317s
> sys     0m0.268s
> jackyf@work:~/temp$ time bash -c "tar -cf - debian | pbzip2 -c > temp2.tar.bz2"
>
> real    0m10.494s
> user    0m19.557s
> sys     0m0.488s
>
> 10 is much less than 18.

n@fugue:~/moko/devel$ time bzip2 linux-2.6.backup.diciembre.20.tar

real	1m28.765s
user	1m27.397s
sys	0m1.180s
n@fugue:~/moko/devel$ time bzip2 -d linux-2.6.backup.diciembre.20.tar.bz2

real	0m46.583s
user	0m45.019s
sys	0m1.236s
n@fugue:~/moko/devel$ time pbzip2 -p2 linux-2.6.backup.diciembre.20.tar

real	0m53.963s
user	1m44.963s
sys	0m1.944s


Same here. Disk I/O was cached so this was only CPU.... pbzip2 can
save about 40%
wall clock time in this test (which has some data that is already compressed,
it is a git repository).

N.-