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CodyKochmann/disable_hyperthreading.sh

Created July 23, 2021 16:22
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how to turn off hyperthreading from a vm with no bios privs
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disable_hyperthreading.sh
#!/bin/bash
# by: Cody Kochmann
#
# this program tells the kernel to turn off the
# odd cores on a host. This is useful when you
# want to disable hypertheading in an ec2
# instance and dont have bios access to do it
# at the chip level.
seq 0 127 | awk '{print "echo 0 > /sys/devices/system/cpu" $1 * 2 + 1 "/online"}' | bash -x
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