Tuesday, June 29, 2010

Dynamic CPU Cores

A neat trick I learned to disable and re-enable a CPU core dynamically in Linux. Handy for testing.
Disable a core
# echo 0 > /sys/devices/system/cpu/cpu1/online
Enable a core
# echo 1 > /sys/devices/system/cpu/cpu1/online
You can't disable CPU0 but all others are fair game.
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