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@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
Glen
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