From 391fe055c943e33e9c191dbeeb21995c0d54ccd9 Mon Sep 17 00:00:00 2001
From: Sentry <sentry@Sentry-Desktop-Fedora.local>
Date: Tue, 14 Jul 2020 15:58:43 +0200
Subject: kernel 5.7.8

---
 SOURCES/parallel_xz.sh | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100755 SOURCES/parallel_xz.sh

(limited to 'SOURCES/parallel_xz.sh')

diff --git a/SOURCES/parallel_xz.sh b/SOURCES/parallel_xz.sh
new file mode 100755
index 0000000..bc08a54
--- /dev/null
+++ b/SOURCES/parallel_xz.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+# Reads filenames on stdin, xz-compresses each in place.
+# Not optimal for "compress relatively few, large files" scenario!
+
+# How many xz's to run in parallel:
+procgroup=""
+while test "$#" != 0; do
+	# Get it from -jNUM
+	N="${1#-j}"
+	if test "$N" = "$1"; then
+		# Not -j<something> - warn and ignore
+		echo "parallel_xz: warning: unrecognized argument: '$1'"
+	else
+		procgroup="$N"
+	fi
+	shift
+done
+
+# If told to use only one cpu:
+test "$procgroup" || exec xargs -r xz
+test "$procgroup" = 1 && exec xargs -r xz
+
+# xz has some startup cost. If files are really small,
+# this cost might be significant. To combat this,
+# process several files (in sequence) by each xz process via -n 16:
+exec xargs -r -n 16 -P $procgroup xz
-- 
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