On Thu, Jul 12, 2012 at 8:40 AM, Koen Kooi <[email protected]> wrote: > > > Op 12 jul. 2012 om 17:29 heeft Andrei Gherzan <[email protected]> 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? >
if we have to use a default it should be -T0 IMO since everyone dont have same number of CPUs > regards, > > koen > > >> >> @g > > _______________________________________________ > Openembedded-core mailing list > [email protected] > http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core _______________________________________________ Openembedded-core mailing list [email protected] http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
