![Eelco Dolstra](/assets/img/avatar_default.png)
XZ compresses significantly better than bzip2. Here are the compression ratios and execution times (using 4 cores in parallel) on my /var/run/current-system (3.1 GiB): bzip2: total compressed size 849.56 MiB, 30.8% [2m08] xz -6: total compressed size 641.84 MiB, 23.4% [6m53] xz -7: total compressed size 621.82 MiB, 22.6% [7m19] xz -8: total compressed size 599.33 MiB, 21.8% [7m18] xz -9: total compressed size 588.18 MiB, 21.4% [7m40] Note that compression takes much longer. More importantly, however, decompression is much faster: bzip2: 1m47.274s xz -6: 0m55.446s xz -7: 0m54.119s xz -8: 0m52.388s xz -9: 0m51.842s The only downside to using -9 is that decompression takes a fair amount (~65 MB) of memory.
15 lines
292 B
Nix
15 lines
292 B
Nix
let
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fromEnv = var: def:
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let val = builtins.getEnv var; in
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if val != "" then val else def;
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in {
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perl = "@perl@";
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shell = "@shell@";
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coreutils = "@coreutils@";
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bzip2 = "@bzip2@";
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xz = "@xz@";
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tar = "@tar@";
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tr = "@tr@";
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nixBinDir = fromEnv "NIX_BIN_DIR" "@bindir@";
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}
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