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proxmox/proxmox-lxc-assign-cpu-cores-6-vcpu--8-pcpu.sh

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+#!/bin/bash
+
+# 2024.feb kneutron
+# mod for lxc
+
+# optional arg1 $1 = vmid if already known
+# Assign cores 2-7 to boinc win10 6-core vm on 8-core host
+#   OR Assign cores 7-5 to boinc win10 3-core vm on 8-core host
+
+# Features:
+# Auto-determines last core number
+# Adapts on-the-fly to 2,3+ vcpus (up to 6) as long as cpu usage is > 0
+#   Can be extended easily for more vcpu counts
+# This should obviously be done on quad-core or better CPU
+
+# script in PATH
+psax
+
+declare -i vmid lastcpu penultcpu  # has to be a number
+
+if [ "$1" = "" ]; then
+  read -p "Enter VMID of highest-CPU LXC: " lxcid
+else
+  lxcid=$1
+fi
+
+[ "$lxcid" = "" ] || [ "$lxcid" = "0" ] && exit 44;
+
+lastcpu=$(grep processor /proc/cpuinfo |tail -n 1 |awk '{print $3}')
+let penultcpu=$lastcpu-1
+
+# SKIP print only pid / subthreads that are using >0 CPU
+# /usr/bin/lxc-start -F -n 105
+pidlist=$(ps -eLf --columns $COLUMNS |grep "lxc-start .*$lxcid" |egrep -v 'grep|bash' |awk '{print $4}')
+echo $pidlist
+
+#exit; 
+
+function assigncores () {
+ 
+set -x
+ taskset -p $1
+ taskset -cp $penultcpu,$lastcpu $1
+ 
+ taskset -cp $lastcpu $2
+ taskset -cp $penultcpu $3
+ 
+ let penultcpu=$penultcpu-1
+[ "$4" = "" ] || taskset -cp $penultcpu $4
+ let penultcpu=$penultcpu-1
+[ "$5" = "" ] || taskset -cp $penultcpu $5
+ let penultcpu=$penultcpu-1
+[ "$6" = "" ] || taskset -cp $penultcpu $6
+ let penultcpu=$penultcpu-1
+[ "$7" = "" ] || taskset -cp $penultcpu $7
+}
+# assign cpu cores 6,7 to win10 vm for better latency
+# REF: https://www.youtube.com/watch?v=-c_451HV6fE
+
+# psthreads.sh 'kvm -id 112' |awk '$5>0 {print}' # field 4 is pid + subthreads
+
+assigncores $pidlist
+
+set +x
+echo "Monitor changes with htop"
+
+exit;
+
+Alt.method:
+
+ps ax |grep "kvm -id 112"
+
+# show threads with cpu
+ps -T -p 12690 |grep CPU
+  12690   12781 ?        23:02:08 CPU 0/KVM
+  12690   12782 ?        21:17:16 CPU 1/KVM
+  12690   12783 ?        1-02:24:12 CPU 2/KVM
+
+# Adapt to different multicore systems
+
+# grep processor /proc/cpuinfo |tail -n 1
+processor       : 7
+# grep processor /proc/cpuinfo |tail -n 1 |awk '{print $3}'
+7