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...

[Dmitry Morozovsky]

Glen,

On Mon, 9 Feb 2015, Glen Barber wrote:

> > > 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.

Hm, I can't beleive you didn't use pxz ;)

Anyway, having this in base, and not depending on external tool, is 
amazingly great.

BTW, Rui, did you some comparative tests with pxz?

-- 
Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck at FreeBSD.org ]
------------------------------------------------------------------------
*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
------------------------------------------------------------------------