1 #!/bin/bash 1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0+ 2 # SPDX-License-Identifier: GPL-2.0+
3 # 3 #
4 # Get an estimate of how CPU-hoggy to be. 4 # Get an estimate of how CPU-hoggy to be.
5 # 5 #
6 # Usage: cpus2use.sh 6 # Usage: cpus2use.sh
7 # 7 #
8 # Copyright (C) IBM Corporation, 2013 8 # Copyright (C) IBM Corporation, 2013
9 # 9 #
10 # Authors: Paul E. McKenney <paulmck@linux.ibm. 10 # Authors: Paul E. McKenney <paulmck@linux.ibm.com>
11 11
12 if test -n "$TORTURE_ALLOTED_CPUS" 12 if test -n "$TORTURE_ALLOTED_CPUS"
13 then 13 then
14 echo $TORTURE_ALLOTED_CPUS 14 echo $TORTURE_ALLOTED_CPUS
15 exit 0 15 exit 0
16 fi 16 fi
17 ncpus=`grep '^processor' /proc/cpuinfo | wc -l 17 ncpus=`grep '^processor' /proc/cpuinfo | wc -l`
18 if mpstat -V > /dev/null 2>&1 18 if mpstat -V > /dev/null 2>&1
19 then 19 then
20 idlecpus=`mpstat | tail -1 | \ 20 idlecpus=`mpstat | tail -1 | \
21 awk -v ncpus=$ncpus '{ print n 21 awk -v ncpus=$ncpus '{ print ncpus * ($7 + $NF) / 100 }'`
22 else 22 else
23 # No mpstat command, so use all availa 23 # No mpstat command, so use all available CPUs.
24 idlecpus=$ncpus 24 idlecpus=$ncpus
25 fi 25 fi
26 awk -v ncpus=$ncpus -v idlecpus=$idlecpus < /d 26 awk -v ncpus=$ncpus -v idlecpus=$idlecpus < /dev/null '
27 BEGIN { 27 BEGIN {
28 cpus2use = idlecpus; 28 cpus2use = idlecpus;
29 if (cpus2use < 1) 29 if (cpus2use < 1)
30 cpus2use = 1; 30 cpus2use = 1;
31 if (cpus2use < ncpus / 10) 31 if (cpus2use < ncpus / 10)
32 cpus2use = ncpus / 10; 32 cpus2use = ncpus / 10;
33 if (cpus2use == int(cpus2use)) 33 if (cpus2use == int(cpus2use))
34 cpus2use = int(cpus2use) 34 cpus2use = int(cpus2use)
35 else 35 else
36 cpus2use = int(cpus2use) + 1 36 cpus2use = int(cpus2use) + 1
37 print cpus2use; 37 print cpus2use;
38 }' 38 }'
39 39
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