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proxmox/proxmox-START-VMS-parallel.sh

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+#!/bin/bash
+
+# 2024.Apr kneutron
+# REF: https://forum.proxmox.com/threads/shutting-down-all-vm-ct-in-parallel.112519/
+
+[ $(which parallel |wc -l) -gt 0 ] || apt-get install -y parallel
+
+VM_LIST=~/vmlist.in # put the number of the VMs that you want to parastart in this file
+# TODO MAKE SURE you uncheck " Start at boot " in the VM/ctr options, or proxmox startup will interfere with what this script is trying to do!
+
+tmpout=/dev/shm/vms-parallel-start.in
+
+# 1         2 3         
+# processor : 7
+lastcpu=$(grep processor /proc/cpuinfo |tail -n 1 |awk '{print $3}')
+[ $lastcpu -gt 1 ] && let lastcpu=$lastcpu-1
+
+# You can manually set a lower limit here
+let lastcpu=3
+
+[ -e "$tmpout" ] && rm -f "$tmpout" # delete the old file ONLY IF it exists
+for vmid in $(cat $VM_LIST); do
+  echo "qm start $vmid" >>"$tmpout"
+#  echo "qm suspend $vmid --todisk" >>"$VM_LIST"
+done
+
+echo "$(date) - parallel START VMS using $lastcpu threads"
+time cat "$tmpout" |parallel -j $lastcpu --progress
+date
+
+exit;
+
+
+Example ~/vmlist.in:
+
+104
+108
+109
+111
+112