tree e527ccf9ede3f671d7d829c1159f2d4719cf65ef
parent e7e66e595a4d3acf63eecb3326b42f62f9dfea44
author Venkatesh Srinivas <venkateshs@google.com> 1544730769 +0000
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1545093180 +0000

[gce] Use pigz if available to compress fx disk image

fx gce create-fuchsia-image constructs a fuchsia disk image suitable
for GCE; the image is a raw disk image inside a gzipped tarball.
One of the slower steps of constructing the disk image is gzipping
the tarball; use pigz (parallel gzip) if available to save time.

On a Xeon 'Skylake' 24 vCPU GCE instance, reduces the time for
compression in create-fuchsia-image from 2 min to 9 seconds.

Change-Id: Ic880890737f6af585f6e91406655097cd79dbab6