1#!/bin/bash 2# 3# Get an estimate of how CPU-hoggy to be. 4# 5# Usage: cpus2use.sh 6# 7# This program is free software; you can redistribute it and/or modify 8# it under the terms of the GNU General Public License as published by 9# the Free Software Foundation; either version 2 of the License, or 10# (at your option) any later version. 11# 12# This program is distributed in the hope that it will be useful, 13# but WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15# GNU General Public License for more details. 16# 17# You should have received a copy of the GNU General Public License 18# along with this program; if not, you can access it online at 19# http://www.gnu.org/licenses/gpl-2.0.html. 20# 21# Copyright (C) IBM Corporation, 2013 22# 23# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com> 24 25ncpus=`grep '^processor' /proc/cpuinfo | wc -l` 26idlecpus=`mpstat | tail -1 | \ 27 awk -v ncpus=$ncpus '{ print ncpus * ($7 + $NF) / 100 }'` 28awk -v ncpus=$ncpus -v idlecpus=$idlecpus < /dev/null ' 29BEGIN { 30 cpus2use = idlecpus; 31 if (cpus2use < 1) 32 cpus2use = 1; 33 if (cpus2use < ncpus / 10) 34 cpus2use = ncpus / 10; 35 if (cpus2use == int(cpus2use)) 36 cpus2use = int(cpus2use) 37 else 38 cpus2use = int(cpus2use) + 1 39 print cpus2use; 40}' 41 42