tree 99db026edc1bce0ac3f92aca5303fb06274e50a9
parent 8dc9bd7b6bd98785ae88223d2ecb1f2a629ddf49
author Ben Pastene <bpastene@chromium.org> 1598661301 -0700
committer Commit Bot <commit-bot@chromium.org> 1599028864 +0000

cache: Use 'pixz' when extracting .xz tarballs if it's installed.

When untar'ing an xz-compressed tarball, we can speed things up
signficiantly by using pixz, which utilizes more CPU cores rather than
just a single core.

So this uses pixz if it's installed to extract .xz tarballs, and
will use up to half of the system's cores.

BUG=chromium:1034063
TEST=unittest
TEST=simplechrome'd locally

Change-Id: If6f4a3680a450c9d886a3f6bf5f1b7e9f0566e96
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2383130
Tested-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>