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