On Mon, 2021-12-20 at 23:15:07 -0500, nick black wrote: > not that i expect you to have run extensive benchmarks or > anything, but how do you feel this compares to libdeflate?
I don't think it matters, because libdeflate does not support a streaming API anyway, so it's of no use in many situations where large files or streaming content needs to be dealt with. It also does not provide a compatible zlib API, which means it cannot be easily migrated to. > the few comparisons i've seen suggest that they are (or at least > were) pretty much a wash, performance-wise. I think when I first noticed libdeflate being uploaded to Debian, I took a look to also play with it for dpkg, but the above problems meant that never got anywhere. From the benchmarks I've seen libdeflate might be a bit faster, but then it would require tons more memory to handle equivalent inputs and outputs. The reasons I found the zlib-ng alternative interesting were because: - the Intel fork is not going to be adding non-Intel optimizations, - the Cloudflare fork does not look very lively, - the zlib upstream does not look very active, and apparently outright refuses contributions to the main code, and only accepts them into its contrib/ directory, OTOH the zlib-ng looks very lively, accepts contributions, has had its code modernized and cleaned up, and seems to be performing rather well in comparison on multiple architectures. Thanks, Guillem
