mirror of https://gitee.com/openkylin/linux.git
41 lines
900 B
Bash
Executable File
41 lines
900 B
Bash
Executable File
#!/bin/bash
|
|
# SPDX-License-Identifier: GPL-2.0+
|
|
#
|
|
# Get an estimate of how CPU-hoggy to be.
|
|
#
|
|
# Usage: cpus2use.sh
|
|
#
|
|
# Copyright (C) IBM Corporation, 2013
|
|
#
|
|
# Authors: Paul E. McKenney <paulmck@linux.ibm.com>
|
|
|
|
if test -n "$TORTURE_ALLOTED_CPUS"
|
|
then
|
|
echo $TORTURE_ALLOTED_CPUS
|
|
exit 0
|
|
fi
|
|
ncpus=`grep '^processor' /proc/cpuinfo | wc -l`
|
|
if mpstat -V > /dev/null 2>&1
|
|
then
|
|
idlecpus=`mpstat | tail -1 | \
|
|
awk -v ncpus=$ncpus '{ print ncpus * ($7 + $NF) / 100 }'`
|
|
else
|
|
# No mpstat command, so use all available CPUs.
|
|
echo The mpstat command is not available, so greedily using all CPUs.
|
|
idlecpus=$ncpus
|
|
fi
|
|
awk -v ncpus=$ncpus -v idlecpus=$idlecpus < /dev/null '
|
|
BEGIN {
|
|
cpus2use = idlecpus;
|
|
if (cpus2use < 1)
|
|
cpus2use = 1;
|
|
if (cpus2use < ncpus / 10)
|
|
cpus2use = ncpus / 10;
|
|
if (cpus2use == int(cpus2use))
|
|
cpus2use = int(cpus2use)
|
|
else
|
|
cpus2use = int(cpus2use) + 1
|
|
print cpus2use;
|
|
}'
|
|
|