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realise and nix copy in parallel #7

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AleXoundOS opened this issue Jun 20, 2020 · 1 comment
Open

realise and nix copy in parallel #7

AleXoundOS opened this issue Jun 20, 2020 · 1 comment

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@AleXoundOS
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AleXoundOS commented Jun 20, 2020 •
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Switching of bottlenecks happens since xz compression takes considerable amount of time. We could realise next nar while compressing the previous. More relevant for fixed output paths.

For example, nix copy /nix/store/4x7f05y3zxkaq74mk44jinnxnpx26yri-MafDb.gnomAD.r2.1.hs37d5_3.8.0.tar.gz means compressing 5.8 GiB with slow lzma/xz. Moreover, it's already compressed with zlib/gzip.

Maybe I should consider switching between compression algorithms when the size is such big or the path is already compressed anyway.
@AleXoundOS AleXoundOS changed the title realise/nix-copy in parallel realise and nix copy in parallel Jun 20, 2020
@AleXoundOS
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Currently, the issue is partly leveled by 8f130a5 which sets compression=none for archives. Archives are detected by matching a list of extensions.

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