Merge pull request #110 from oci-hpc/2.10.1_ubuntu_ht

Ubuntu Hyperthreading disable

Author: arnaudfroidmont

playbooks/roles/hyperthreading/files/control_hyperthreading_ubuntu.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+if [ `id -u` -ne 0 ]
+then
+        echo $0: you need to be root
+        exit 1
+fi
+disable_ht() {
+        echo -n $0: disabling
+        echo off | sudo tee /sys/devices/system/cpu/smt/control
+}
+
+enable_ht() {
+        echo -n $0: enabling
+        echo on | sudo tee /sys/devices/system/cpu/smt/control
+}
+
+case "$1" in
+"1"|"on")
+        enable_ht
+        ;;
+"0"|"off")
+        disable_ht
+        ;;
+"show")
+        ;;
+*)
+        echo $0: wrong argument "$1"
+        exit 2
+        ;;
+esac
+
+echo ''
+lscpu | egrep "On-line|Off-line"
+
+exit 0

playbooks/roles/hyperthreading/files/disable-hyperthreading_ubuntu.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Start this service to disable Hyperthreading, stop it to enable Hyperthreading.
+After=syslog.target irqbalance.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=true
+ExecStart=/opt/oci-hpc/sbin/control_hyperthreading_ubuntu.sh off
+ExecStop=/opt/oci-hpc/sbin/control_hyperthreading_ubuntu.sh on
+
+[Install]
+WantedBy=multi-user.target

playbooks/roles/hyperthreading/tasks/main.yml

@@ -1,2 +1,5 @@
 - include: el.yml
   when: ansible_os_family == 'RedHat'
+
+- include: ubuntu.yml
+  when: ansible_distribution == 'Ubuntu'

playbooks/roles/hyperthreading/tasks/ubuntu.yml

@@ -0,0 +1,37 @@
+---
+- name: Make sure directory exist
+  become: true
+  file: 
+    path: /opt/oci-hpc/sbin
+    state: directory
+    mode: '0755'
+
+- name: Copy script
+  become: true
+  copy: 
+    src: control_hyperthreading_ubuntu.sh
+    dest: /opt/oci-hpc/sbin/control_hyperthreading_ubuntu.sh
+    mode: '0755'
+
+- name: Copy service unit
+  become: true
+  copy: 
+    src: disable-hyperthreading_ubuntu.service
+    dest: /etc/systemd/system/disable-hyperthreading_ubuntu.service
+
+- name: Create a unit file
+  become: true
+  copy: 
+    src: disable-hyperthreading_ubuntu.service
+    dest: /etc/systemd/system/disable-hyperthreading.service
+
+- name: Force systemd to reread configs
+  ansible.builtin.systemd:
+    daemon_reload: yes
+
+- name: 
+  ansible.builtin.systemd:
+    name: disable-hyperthreading_ubuntu.service
+    state: started
+    enabled: yes
+  when: not hyperthreading|default(true)|bool