1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0+
3 #
4 # Start up the specified number of jitter.sh scripts in the background.
5 #
6 # Usage: . jitterstart.sh n jittering-dir duration [ sleepmax [ spinmax ] ]
7 #
8 # n: Number of jitter.sh scripts to start up.
9 # jittering-dir: Directory in which to put "jittering" file.
10 # duration: Time to run in seconds.
11 # sleepmax: Maximum microseconds to sleep, defaults to one second.
12 # spinmax: Maximum microseconds to spin, defaults to one millisecond.
13 #
14 # Copyright (C) 2021 Facebook, Inc.
15 #
16 # Authors: Paul E. McKenney <paulmck@kernel.org>
17
18 jitter_n=$1
19 if test -z "$jitter_n"
20 then
21 echo jitterstart.sh: Missing count of jitter.sh scripts to start.
22 exit 33
23 fi
24 jittering_dir=$2
25 if test -z "$jittering_dir"
26 then
27 echo jitterstart.sh: Missing directory in which to place jittering file.
28 exit 34
29 fi
30 shift
31 shift
32
33 touch ${jittering_dir}/jittering
34 for ((jitter_i = 1; jitter_i <= $jitter_n; jitter_i++))
35 do
36 jitter.sh $jitter_i "${jittering_dir}/jittering" "$@" &
37 done
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