On Tue, Sep 21, 2021 at 03:48:29PM +0200, Michael Opdenacker wrote: > > On 9/21/21 3:20 PM, Michael Opdenacker wrote: > > By the way, zstd seems to be marginally worse (+1%) than xz in terms of > > compressed size, but is orders of magnitude faster (see > > https://archlinux.org/news/now-using-zstandard-instead-of-xz-for-package-compression/). > > > Actually, this article only mentions decompression speed, but that's > also true for compression speed. > > Here are my own tests: > > mike@mike-laptop:~/tmp$ time gzip linux-5.15-rc2.tar > > real 0m29.293s > user 0m28.712s > sys 0m0.553s > > mike@mike-laptop:~/tmp$ time xz linux-5.15-rc2.tar > > real 7m2.658s > user 7m1.096s > sys 0m1.280s > > mike@mike-laptop:~/tmp$ time zstd linux-5.15-rc2.tar > linux-5.15-rc2.tar : 16.29% (1136803840 => 185233271 bytes, > linux-5.15-rc2.tar.zst) > > real 0m5.476s > user 0m5.530s > sys 0m0.864s > > mike@mike-laptop:~/tmp$ ls -la linux-5.15* > -rw-rw-r-- 1 mike mike 1136803840 Sep 21 15:31 linux-5.15-rc2.tar > -rw-rw-r-- 1 mike mike 198135832 Sep 21 15:24 linux-5.15-rc2.tar.gz > -rw-rw-r-- 1 mike mike 125980548 Sep 21 15:26 linux-5.15-rc2.tar.xz > -rw-rw-r-- 1 mike mike 185233271 Sep 21 15:31 linux-5.15-rc2.tar.zst > > So, here the claim that zstd (with default options) is almost as good as > xz in compressed size is not confirmed. However, zstd is a clear winner > in terms of compression speed, and anyway better than gzip. This is > worth switching.
Thank you for measuring this! I will re-submit the patch when we update to a more recent Yocto version. > > Cheers > > Michael > > -- > Michael Opdenacker, Bootlin > Embedded Linux and Kernel engineering > https://bootlin.com > >
-=-=-=-=-=-=-=-=-=-=-=- Links: You receive all messages sent to this group. View/Reply Online (#156236): https://lists.openembedded.org/g/openembedded-core/message/156236 Mute This Topic: https://lists.openembedded.org/mt/85785376/21656 Group Owner: openembedded-core+ow...@lists.openembedded.org Unsubscribe: https://lists.openembedded.org/g/openembedded-core/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
