57 lines
1.2 KiB
Bash
57 lines
1.2 KiB
Bash
#!/bin/bash
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#******************************************************************************
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# Purpose: turn off all CPU's but one (CPU 0), turn on all CPU's
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# Linux only
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# Author: M. Thaler, BSy 4/2014
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# Usage: multiCPUs off: turn off all CPUs but one
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# multiCPUs on: turn all CPUs on
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#
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# Version: v.fs20
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#******************************************************************************
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theDir="/sys/devices/system/cpu"
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# check if sys exists
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if test ! -d $theDir
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then
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echo "*** cannot set to single CPU ***"
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exit 1
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fi
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# figure out what to do: multi CPUs off (single CPU) or all CPU's on
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let status=1
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if test "$1" = "on"
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then
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let status=1
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else
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if test "$1" = "off"
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then
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let status=0
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else
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echo "*** what do you want: ... on or off? ***"
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exit 1
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fi
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fi
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# turn CPU's on or off
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cd $theDir
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CPUs=`ls -d cpu* | grep 'cpu[0-9][0-9]*'`
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for CPU in $CPUs
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do
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if test ! "$CPU" = "cpu0"
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then
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echo "$CPU on = $status"
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currVal=`cat ./$CPU/online`
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# only change if different ... avoid error message
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if test ! "$currVal" = "$status"
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then
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echo "$status" > "./$CPU/online"
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fi
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fi
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done
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#******************************************************************************
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