From c7937b1115fb30c8ca23460c0af0c652708f2da5 Mon Sep 17 00:00:00 2001
From: David Abdurachmanov <david.abdurachmanov@gmail.com>
Date: Wed, 13 Jun 2018 13:25:49 +0200
Subject: [PATCH] Enable multi-thread support in xz compression

xz-utils starting 5.2.0 (2014-12-21) support multi-threaded compression.
This version was added to Fedora 22 (2015-01-07) and also available in
CentOS 7.

-T 0 allows xz to use all available cores on the system assuming input
file is big enough and there is enough memory on the system.

Tested on SiFive HiFive Unleashed (RISC-V, riscv64) with Fedora and it
showed significant time savings.

Signed-off-by: David Abdurachmanov <david.abdurachmanov@gmail.com>
---
 appcreate/appliance.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/appcreate/appliance.py b/appcreate/appliance.py
index 34971a3..70428b7 100644
--- a/appcreate/appliance.py
+++ b/appcreate/appliance.py
@@ -643,7 +643,7 @@ class ApplianceImageCreator(ImageCreator):
 
                 if self.__compress:
                     # Compress with xz using 16 MiB block size for seekability
-                    rc = subprocess.call(["xz", "-z", "--block-size=16777216", src])
+                    rc = subprocess.call(["xz", "-z", "--block-size=16777216", "-T 0", src])
                     if rc == 0:
                         logging.debug("compression successful")
                     if rc != 0:
-- 
2.17.2