Any volunteers to test this on a system with >4 real cores? Op 12 jul. 2012, om 20:13 heeft Andrei Gherzan het volgende geschreven:
> 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 0. > > The following changes since commit 90ad663909c0c8a405b22a510c9f957007d02669: > > upstream_tracking: update boost (2012-07-09 17:21:38 +0100) > > are available in the git repository at: > > git://git.yoctoproject.org/poky-contrib ag/xz > http://git.yoctoproject.org/cgit.cgi/poky-contrib/log/?h=ag/xz > > Andrei Gherzan (3): > image_types.bbclass: Fix COMPRESS_CMD for xz to redirect compressed > data to file > image_types.bbclass: Add XZ variable to set number of threads to be > used while compressing > image_types.bbclass: Default XZ_COMPRESSION_LEVEL to -e -6 > > meta/classes/image_types.bbclass | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > -- > 1.7.9.5 > _______________________________________________ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
