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