svn commit: r278433 - in head: . contrib/xz contrib/xz/src/common contrib/xz/src/liblzma contrib/xz/src/liblzma/api contrib/xz/src/liblzma/api/lzma contrib/xz/src/liblzma/check contrib/xz/src/liblz...

[Glen Barber]

On Mon, Feb 09, 2015 at 12:25:40PM +0000, Glen Barber wrote:
> On Mon, Feb 09, 2015 at 06:20:35AM +0000, Rui Paulo wrote:
> > Author: rpaulo
> > Date: Mon Feb  9 06:20:34 2015
> > New Revision: 278433
> > URL: https://svnweb.freebsd.org/changeset/base/278433
> > 
> > Log:
> >   Merge xz 5.2.0.
> >   
> >   This brings support for multi-threaded compression.  This brings close
> >   N times faster compression where N is the number of CPU cores.
> >   Because of this, liblzma now depends on libthr.
> >   
> 
> This is fantastic, thank you for doing this update.
> 
> FWIW, compressing VM images (some sparse files, some not) would take
> upwards of 45 minutes, which after this update, just takes a few
> minutes.
> 
>  root at releng2:/R2/vmimages # time xz -T 0 -k FreeBSD-11.0-CURRENT-amd64.qcow2 \
>      time xz -T 0 -k FreeBSD-11.0-CURRENT-amd64.raw; \
>      time xz -T 0 -k FreeBSD-11.0-CURRENT-amd64.vhd; \
>      time xz -T 0 -k FreeBSD-11.0-CURRENT-amd64.vmdk
>  1027.602u 40.376s 1:09.57 1535.1%       81+192k 0+19774io 0pf+0w
>  1032.978u 38.823s 1:08.17 1572.2%       81+192k 0+19696io 0pf+0w
>  1033.908u 38.593s 1:11.70 1495.8%       81+192k 0+19729io 0pf+0w
>  1091.749u 42.371s 1:04.27 1764.6%       81+192k 0+19751io 0pf+0w
> 

I meant to include that this is on a 48-core machine.

Glen

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