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--- scripts:hyper-threading [2017/09/04 06:10] – [Information] Sean Rhone
+++ scripts:hyper-threading [2021/06/18 02:33] (current) – removed Sean Rhone
@@ Line 1: / Line 1: @@
-====== Information ======
-  * Scripts to disable/re-enable Intel's Hyper-threading technology
-  * Similar functionality can be achieved by setting the ''maxcpus'' kernel option to half the amount of presented cores ((a i7-6700HQ has 4 cores, but with HT, it shows 8; so to disable HT, ''maxcpus'' should be ''4'' and the complete option will look like ''maxcpus=4''))
-===== Credit =====
-  * https://serverfault.com/a/797534
-====== Disable HT ======
-  * This disables the virtual cores created by Hyper-threading and leaves the actual cores enabled
-  sudo mkdir -p '/root/Scripts' && sudo -e '/root/Scripts/ht-off.sh' && sudo chmod +x '/root/Scripts/ht-off.sh'
-<code>
-#!/bin/bash
-for CPU in /sys/devices/system/cpu/cpu[0-7]*; do
-    CPUID=`basename $CPU | cut -b4-`
-    echo -en "CPU: $CPUID\t"
-    [ -e $CPU/online ] && echo "1" > $CPU/online
-    THREAD1=`cat $CPU/topology/thread_siblings_list | cut -f1 -d,`
-    if [ $CPUID = $THREAD1 ]; then
-        echo "-> enable"
-        [ -e $CPU/online ] && echo "1" > $CPU/online
-    else
-        echo "-> disable (HT core)"
-        echo "0" > $CPU/online
-    fi
-done
-lscpu | grep 'Thread(s) per core'
-lscpu | grep 'On-line CPU(s) list'
-lscpu | grep 'Off-line CPU(s) list'</code>
-  su -c '/root/Scripts/ht-off.sh'
-===== Service =====
-  sudo -e '/etc/systemd/system/ht-off.service' && sudo systemctl daemon-reload && sudo systemctl enable 'ht-off' --now && sudo systemctl status 'ht-off' -l
-<code>
-[Unit]
-Description=Intel Hyper-Threading Disable
-After=basic.target
-Wants=basic.target
-[Service]
-Type=oneshot
-ExecStart='/bin/bash' -c '/root/Scripts/ht-off.sh'
-[Install]
-WantedBy=basic.target</code>
-====== Enable HT ======
-  * This re-enables disabled cores from the above script
-  sudo mkdir -p '/root/Scripts' && sudo -e '/root/Scripts/ht-on.sh' && sudo chmod +x '/root/Scripts/ht-on.sh'
-<code>
-#!/bin/bash
-for CPU in /sys/devices/system/cpu/cpu[0-7]*; do
-    CPUID=`basename $CPU | cut -b4-`
-    echo -en "CPU: $CPUID\t"
-    [ -e $CPU/online ] && echo "1" > $CPU/online
-    THREAD1=`cat $CPU/topology/thread_siblings_list | cut -f1 -d,`
-    if [ $CPUID = $THREAD1 ]; then
-        echo "-> enable"
-        [ -e $CPU/online ] && echo "1" > $CPU/online
-    else
-        echo "-> enable (HT core)"
-        echo "1" > $CPU/online
-    fi
-done
-lscpu | grep 'Thread(s) per core'
-lscpu | grep 'On-line CPU(s) list'
-lscpu | grep 'Off-line CPU(s) list'</code>
-  su -c '/root/Scripts/ht-on.sh'