| #!/bin/bash | |
| # | |
| # Get an estimate of how CPU-hoggy to be. | |
| # | |
| # Usage: cpus2use.sh | |
| # | |
| # This program is free software; you can redistribute it and/or modify | |
| # it under the terms of the GNU General Public License as published by | |
| # the Free Software Foundation; either version 2 of the License, or | |
| # (at your option) any later version. | |
| # | |
| # This program is distributed in the hope that it will be useful, | |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| # GNU General Public License for more details. | |
| # | |
| # You should have received a copy of the GNU General Public License | |
| # along with this program; if not, you can access it online at | |
| # http://www.gnu.org/licenses/gpl-2.0.html. | |
| # | |
| # Copyright (C) IBM Corporation, 2013 | |
| # | |
| # Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com> | |
| ncpus=`grep '^processor' /proc/cpuinfo | wc -l` | |
| idlecpus=`mpstat | tail -1 | \ | |
| awk -v ncpus=$ncpus '{ print ncpus * ($7 + $NF) / 100 }'` | |
| awk -v ncpus=$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; | |
| }' | |