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Active · Last activity 3d ago
See all on GitHub →At Google we found around 3-5% of performance uplift for different kind of tests, mostly nicely compressed data. The improvement is mostly uniform across levels, x86-64 and aarch64 platforms with no change in compression ratios (variance is around 0.08%). We decided to implement a slower crc32c version for other platforms. Let us know if you want to leave multiplication hashes but this will lead to slightly different outputs across platforms. We decided to prioritize stability rather than speed but we don't have an opinion on this. This patch directly can be detrimental to 32bit platforms as well as RISC-V 64 bits. One test suddenly started not to have an error, please take a look :)
danlark1 · 12h ago
Recent fixes
Describe the bug It looks like the zstd command-line tool has a limit on dictionary sizes of 33554432 bytes, even when using --long windows. Is that a fundamental limit of the zstd format or is it just a limitation of the CLI and it doesn't alter it based on the compression window? To Reproduce Steps to reproduce the behavior: 1. Stage 2 75 MB files, 1.txt and 2.txt in a directory. 2. 3. Get error Expected behavior Allow for using compression dictionaries up to the window size (or close to it). Desktop (please complete the following information): OS: Mac Version 1.5.7 Additional context** This is in the context of delta-compressing large WASM files for compression dictionary transport which allows for compression windows up to 128 MB.
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Repository: facebook/zstd. Description: Zstandard - Fast real-time compression algorithm Stars: 26750, Forks: 2420. Primary language: C. Languages: C (76.2%), C++ (13.7%), Shell (3.1%), Python (2.5%), Makefile (1.9%). Homepage: http://www.zstd.net Latest release: v1.5.7 (1y ago). Open PRs: 39, open issues: 218. Last activity: 3d ago. Community health: 87%. Top contributors: Cyan4973, terrelln, inikep, felixhandte, stellamplau, sean-purcell, embg, daniellerozenblit, GeorgeLu97, dependabot[bot] and others.