On Thu, Jul 12, 2012 at 7:19 PM, Koen Kooi <k...@dominion.thruhere.net>wrote:
> > Op 12 jul. 2012, om 17:51 heeft Andrei Gherzan het volgende geschreven: > > > On Thu, Jul 12, 2012 at 6:40 PM, Koen Kooi <k...@dominion.thruhere.net> > wrote: > > > > > > Op 12 jul. 2012 om 17:29 heeft Andrei Gherzan <and...@gherzan.ro> het > volgende geschreven: > > > > > Hello, > > > > > > Koen suggested to add -T to xz commands. We have this option > implemented in our current version .1alpha. > > > > > > -T threads, --threads=threads > > > Specify the number of worker threads to use. Setting > threads to > > > a special value 0 makes xz use as many threads as there > are CPU > > > cores on the system. The actual number of threads can > be less > > > than threads if the input file is not big enough for > threading > > > with the given settings or if using more threads > would exceed > > > the memory usage limit. > > > > > > ------------------- > > > > > > Memory: 7.8 GiB > > > Processor:: Intel® Core™ i5-2540M CPU @ 2.60GHz × 4 > > > > > > File to compress: 1.9G > > > > > > xz -f -k -e -9 --check=crc32 (current configuration) > > > Memory: 673Mb > > > real 6m37.170s > > > user 6m35.389s > > > sys 0m0.884s > > > Compressed file size: 3.4Mb > > > > > > xz -f -k -e -9 -T 4 --check=crc32 > > > Memory: Cannot allocate memory > > > > > > xz -f -k -e -8 -T 4 --check=crc32 > > > Memory: 1.8G > > > real 3m24.462s > > > user 12m8.502s > > > sys 0m2.180s > > > Compressed file size: 3.4Mb > > > > > > xz -f -k -T 4 --check=crc32 (-e defaults to -6) > > > Memory: 471Mb > > > real 1m9.265s > > > user 4m8.972s > > > sys 0m0.944s > > > Compressed file size: 3.4Mb > > > > > > So my conclusion would be to use the default -e -6 with -T 4. > > > > Out of curiousity, what does -T0 give you? > > > > > > Exactly the same as -T 0. > > I don't see that in the results above :) Sorry. Wanted to type -T 4. :)
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