mod for different multicore systems, be more automatic

proxmox/proxmox-vm-assign-cpu-cores.sh

@@ -3,10 +3,12 @@
 # 2024.feb kneutron
 # optional arg1 $1 = vmid if already known
 # Assign cores 6,7 to boinc win10 2-core vm
+# This should obviously be done on quad-core or better CPU
 
 psax
 
-declare -i vmid # has to be a number
+declare -i vmid lastcpu  # has to be a number
+
 if [ "$1" = "" ]; then
   read -p "Enter VMID of highest-CPU kvm: " vmid
 else
@@ -15,6 +17,10 @@ fi
 
 [ "$vmid" = "" ] || [ "$vmid" = "0" ] && exit 44;
 
+lastcpu=$(grep processor /proc/cpuinfo |tail -n 1 |awk '{print $3}')
+let penultcpu=$lastcpu-1
+
+# print only pid / subthreads that are using >0 CPU
 pidlist=$(ps -eLf --columns $COLUMNS |grep "kvm -id $vmid" |egrep -v 'grep|bash' |awk '$5>0 {print $4}')
 echo $pidlist
 
@@ -24,10 +30,10 @@ function assigncores () {
  
 set -x
  taskset -p $1
- taskset -cp 6,7 $1
+ taskset -cp $penultcpu,$lastcpu $1
  
- taskset -cp 6 $2
- taskset -cp 7 $3
+ taskset -cp $penultcpu $2
+ taskset -cp $lastcpu $3
 }
 # assign cpu cores 6,7 to win10 vm for better latency
 # REF: https://www.youtube.com/watch?v=-c_451HV6fE
@@ -36,5 +42,14 @@ set -x
 
 assigncores $pidlist
 
+set +x
 echo "Monitor changes with htop"
 
+exit;
+
+# 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