From a3bfaa191958c4b70d6c674f972c3b911f8b1bfa Mon Sep 17 00:00:00 2001

From: Vratislav Podzimek <vpodzime@redhat.com>

Date: Wed, 13 Nov 2013 13:20:39 +0100

Subject: [PATCH] Run 'xz' and 'lzma' with multiple threads

This speeds up compression a lot on multicore systems.

https://bugzilla.redhat.com/show_bug.cgi?id=1029786

[Edited-by: Harald Hoyer: use getconf for cpu_count]

---

 dracut.sh | 6 ++++--

 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/dracut.sh b/dracut.sh

index 03472ba..bce2662 100755

--- a/dracut.sh

+++ b/dracut.sh

@@ -693,12 +693,14 @@ stdloglvl=$((stdloglvl + verbosity_mod_l))

 # eliminate IFS hackery when messing with fw_dir

 fw_dir=${fw_dir//:/ }

+cpu_count=$(getconf _NPROCESSORS_ONLN)

+

 # handle compression options.

 [[ $compress ]] || compress="gzip"

 case $compress in

     bzip2) compress="bzip2 -9";;

-    lzma)  compress="lzma -9";;

-    xz)    compress="xz --check=crc32 --lzma2=dict=1MiB";;

+    lzma)  compress="lzma -9 ${cpu_count:+-T$cpu_count}";;

+    xz)    compress="xz --check=crc32 --lzma2=dict=1MiB ${cpu_count:+-T$cpu_count}";;

     gzip)  compress="gzip -9"; command -v pigz > /dev/null 2>&1 && compress="pigz -9";;

     lzo)   compress="lzop -9";;

     lz4)   compress="lz4 -9";;