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stdenv: enable multithreading for xz decompression

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(only if the implementation supports it)

This speeds up the decompression of huge tar.xz tarballs (e.g. chromium)
on high core count systems.
This commit is contained in:
emilylange 2023-10-25 23:56:55 +02:00
parent 6c5458cf32
commit 80627bfe8f
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GPG key ID: 0AD773CE46FD0F87
1 changed files with 5 additions and 1 deletions
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6
pkgs/stdenv/generic/setup.sh
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@ -1057,7 +1057,11 @@ _defaultUnpack() {
case "$fn" in case "$fn" in
*.tar.xz | *.tar.lzma | *.txz) *.tar.xz | *.tar.lzma | *.txz)
# Don't rely on tar knowing about .xz. # Don't rely on tar knowing about .xz.
xz -d < "$fn" | tar xf - --warning=no-timestamp # Additionally, we have multiple different xz binaries with different feature sets in different
# stages. The XZ_OPT env var is only used by the full "XZ utils" implementation, which supports
# the --threads (-T) flag. This allows us to enable multithreaded decompression exclusively on
# that implementation, without the use of complex bash conditionals and checks.
XZ_OPT="--threads=$NIX_BUILD_CORES" xz -d < "$fn" | tar xf - --warning=no-timestamp
;; ;;
*.tar | *.tar.* | *.tgz | *.tbz2 | *.tbz) *.tar | *.tar.* | *.tgz | *.tbz2 | *.tbz)
# GNU tar can automatically select the decompression method # GNU tar can automatically select the decompression method