>>>>> "PM" == Panu Matilainen <pmati...@redhat.com> writes:
PM> Note that rpm doesn't support parallel zstd compression, and while PM> it does for xz, that's not even utilized in Fedora. Doing parallel xz compression has a surprising cost in compression ratio which gets worse as the thread count increases (because it just splits the input into independent blocks and compresses them separately). I did start on a feature to have it enabled but then abandoned that after realizing that it didn't really work as I'd hoped. That said, I do wonder how difficult it would be to do parallel zstd compression/decompression within RPM. If it were possible then that might help to obviate some of the downsides. PM> To me the sweet spot between compression efficiency and speed seems PM> closer to 10 than 19 - yes at a minor loss in space but huge speedup PM> in both compress and decompress times. One problem is that I don't think anyone wants to see any quantifiable regression in overall package size. Spins still struggle to fit within fixed media sizes as the package set grows ever larger. - J< _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org
