| #!/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; |
| }' |
| |
