blob: e2c961102c3bf597e0b7e900d7fa1b32e33e7b97 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
#!/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
#This seems to cause problems with large numbers
if (( $procgroup > 4 )); then
procgroup=4
fi
# If told to use only one cpu:
test "$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
|
