commit c5eb66cafb6b9f245d07cc3634fea0326f46759d
author Venkatesh Srinivas <venkateshs@google.com> Thu Dec 13 19:52:49 2018 +0000
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> Tue Dec 18 00:33:00 2018 +0000
tree e527ccf9ede3f671d7d829c1159f2d4719cf65ef
parent e7e66e595a4d3acf63eecb3326b42f62f9dfea44

[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

gce/create-fuchsia-image.sh

diff --git a/gce/create-fuchsia-image.sh b/gce/create-fuchsia-image.sh
index 6416dc2..94b3bcd 100755
--- a/gce/create-fuchsia-image.sh
+++ b/gce/create-fuchsia-image.sh
@@ -21,7 +21,12 @@
 cd "$tmp"
 mv "$diskimage" disk.raw
 
-tar -Sczf "$FUCHSIA_OUT_DIR/$FUCHSIA_GCE_IMAGE.tar.gz" disk.raw
+tar -Scf "$FUCHSIA_OUT_DIR/$FUCHSIA_GCE_IMAGE.tar" disk.raw
+if [ -x "$(command -v pigz)" ]; then
+  pigz -f "$FUCHSIA_OUT_DIR/$FUCHSIA_GCE_IMAGE.tar"
+else
+  gzip -f "$FUCHSIA_OUT_DIR/$FUCHSIA_GCE_IMAGE.tar"
+fi
 gsutil cp "$FUCHSIA_OUT_DIR/$FUCHSIA_GCE_IMAGE.tar.gz" "gs://$FUCHSIA_GCE_PROJECT/$FUCHSIA_GCE_USER/$FUCHSIA_GCE_IMAGE.tar.gz"
 gcloud -q compute images delete "$FUCHSIA_GCE_IMAGE"
 gcloud -q compute images create "$FUCHSIA_GCE_IMAGE" --source-uri "gs://$FUCHSIA_GCE_PROJECT/$FUCHSIA_GCE_USER/$FUCHSIA_GCE_IMAGE.tar.gz" --guest-os-features=UEFI_COMPATIBLE