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Now using Zstandard instead of xz for package compression

Submitted by Roy Schestowitz on Saturday 4th of January 2020 10:05:09 PM Filed under
GNU
Linux

As announced on the mailing list, on Friday, Dec 27 2019, our package compression scheme has changed from xz (.pkg.tar.xz) to zstd (.pkg.tar.zst).

zstd and xz trade blows in their compression ratio. Recompressing all packages to zstd with our options yields a total ~0.8% increase in package size on all of our packages combined, but the decompression time for all packages saw a ~1300% speedup.

We already have more than 545 zstd-compressed packages in our repositories, and as packages get updated more will keep rolling in. We have not found any user-facing issues as of yet, so things appear to be working.

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Arch's Switch To Zstd: ~0.8% Increase In Package Size For ~1300%

Submitted by Roy Schestowitz on Saturday 4th of January 2020 10:07:44 PM.
  • Arch's Switch To Zstd: ~0.8% Increase In Package Size For ~1300% Speedup In Decompression Time

    Arch Linux has been working the past several months on transitioning to Zstd-compressed packages in place of XZ compression for faster package installation. At the end of December that package compression scheme changed and the results are impressive.

    The package compression ratio for XZ and Zstd are similar and when recompressing all of Arch's packages with Zstd yielded a total increase of about 0.8% for all packages combined. However, the decompression time for all Arch packages saw a ~1300% speedup. Also promising is that no issues have come up yet in their testing.

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