On Sun, Aug 06, 2023 at 04:34:46AM -0000, Daniel Alley wrote: > >In my test zlib-ng is about 40% faster. > > I did some testing with zlib-ng and createrepo-c a few months ago > [0], and I also found that the compression portion of the workload > was about 40% faster. So this matches my experience, too. > > (BTW, if that github comment [0] sounds negative, it isn't meant to, > it's just that zlib ended up not being the primary culprit of the > performance issue I was investigating at the time, so I was not as > immediately interested in replacing it.) > > I support this proposal. A tricky detail is that one of the big > upsides of zlib-ng is that it has a lot of optimized codepaths for > ARM, POWER, Z, RISC-V, AVX-256, AVX-512 and so forth which > madler/zlib does not have. And that's fantastic, but I expect it > could make the testing process a bit more painful.
There are indeed quite a lot. For example this is just x86: https://github.com/zlib-ng/zlib-ng/tree/develop/arch/x86 > Since each of the arch-specific acceleration codepaths is behind a > separate build flag [1] though, (I assume) we could easily do a more > conservative rollout with most arch-specific optimizations disabled > at first, and then enabled gradually over time. & the other thing it is important to note is that it does seem to do CPUID detection at runtime, so we are able to ship a "runs anywhere" binary. See: https://github.com/zlib-ng/zlib-ng/blob/develop/arch/x86/x86_features.c Rich. > [0] > https://github.com/rpm-software-management/createrepo_c/pull/335#issuecomment-1381362220 > [1] https://github.com/zlib-ng/zlib-ng#advanced-build-options > _______________________________________________ > devel mailing list -- devel@lists.fedoraproject.org > To unsubscribe send an email to devel-le...@lists.fedoraproject.org > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org > Do not reply to spam, report it: > https://pagure.io/fedora-infrastructure/new_issue -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
