All we did at my site was to essentially replace the gzip binary.
Its wrong and its cheating, but that is what we did. On Thu, Aug 25, 2011 at 02:21:13PM -0600, Charles Curley wrote: > On Thu, 25 Aug 2011 09:45:38 -0400 > gene heskett <ghesk...@wdtv.com> wrote: > > > That could be handy if it is easily configured to be used, which I > > have not investigated. > > http://wiki.zmanda.com/index.php/How_To:Use_pigz_to_speed_up_compression > > > Making amanda use its parallelism might be a > > challenging project however. > > Other emails on this list indicate that using pigz does speed up amanda > runs. > > Just for the halibut, I did a bit of testing on an otherwise idle > desktop with two AMD cores. I created a tarball using my /var > directory. Then: > > root@dzur:/# time pigz var.test.tar > > real 6m1.411s > user 9m5.290s > sys 0m44.550s > root@dzur:/# ll var.test.tar.gz > -rw-r--r-- 1 root root 6786436232 2011-08-25 10:07 var.test.tar.gz > root@dzur:/# time gzip -d var.test.tar.gz > > real 4m16.611s > user 1m43.080s > sys 0m38.410s > root@dzur:/# ll var.test.tar > -rw-r--r-- 1 root root 9458923520 2011-08-25 10:07 var.test.tar > root@dzur:/# tar -tf var.test.tar > # output omitted; no error messages > root@dzur:/# time gzip var.test.tar > > real 9m45.992s > user 8m23.070s > sys 0m32.970s > root@dzur:/# ll var.test.tar.gz > -rw-r--r-- 1 root root 6785153296 2011-08-25 10:07 var.test.tar.gz > root@dzur:/# gunzip var.test.tar.gz > root@dzur:/# ll var.test.tar > -rw-r--r-- 1 root root 9458923520 2011-08-25 10:07 var.test.tar > root@dzur:/# pigz --version > pigz 2.1.6 > root@dzur:/# > > > Note that gzip took noticeably longer but produced a marginally smaller > output file (possibly due to different default compression values; I > did not investigate). Testing the output file as above produced no error > message. The uncompressed tarball retained its size. > > I used gzip -d to test rather than pigz -d in order to verify > compatibility. > > While we're at it, I am glad I never did implement bzip2 compression > for Amanada: > > root@dzur:/# time bzip2 var.test.tar > > real 157m54.710s > user 156m41.360s > sys 0m35.550s > root@dzur:/# ll var.test.tar.bz2 > -rw-r--r-- 1 root root 6780647698 2011-08-25 10:07 var.test.tar.bz2 > root@dzur:/# > > > -- > > Charles Curley /"\ ASCII Ribbon Campaign > Looking for fine software \ / Respect for open standards > and/or writing? X No HTML/RTF in email > http://www.charlescurley.com / \ No M$ Word docs in email > > Key fingerprint = CE5C 6645 A45A 64E4 94C0 809C FFF6 4C48 4ECD DFDB --- Brian R Cuttler brian.cutt...@wadsworth.org Computer Systems Support (v) 518 486-1697 Wadsworth Center (f) 518 473-6384 NYS Department of Health Help Desk 518 473-0773 IMPORTANT NOTICE: This e-mail and any attachments may contain confidential or sensitive information which is, or may be, legally privileged or otherwise protected by law from further disclosure. It is intended only for the addressee. If you received this in error or from someone who was not authorized to send it to you, please do not distribute, copy or use it or any attachments. Please notify the sender immediately by reply e-mail and delete this from your system. Thank you for your cooperation.
