42 lines
1.2 KiB
Bash
42 lines
1.2 KiB
Bash
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#!/bin/bash
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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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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, you can access it online at
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# http://www.gnu.org/licenses/gpl-2.0.html.
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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.vnet.ibm.com>
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ncpus=`grep '^processor' /proc/cpuinfo | wc -l`
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idlecpus=`mpstat | tail -1 | \
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awk -v ncpus=$ncpus '{ print ncpus * ($7 + $NF) / 100 }'`
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awk -v ncpus=$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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