[WIP] Lapinou
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What is Lapinou ?
Lapinou is a dumb tool to pin VCPU(s) of instances running with Qemu/KVM. The tool is leveraging libvirt-go.
Right now Lapinou will try to pin all the VCPUs of all the Domains present on the host and will only pin per CPU Threads. We will maybe add more pinning strategies in the future. See : IBM - Tuning KVM for performance.
DISCLAIMER : Pinning VCPU(s) can have really bad impact on your performance if you don't know what you are doing. Do not use this tool in your prod :)
Examples
With only 1 Domain on the host
$ lapinou -cli
INFO[0000] Domains founds count=3
INFO[0000] Enough CPUs to apply pinning on provisioned VCPUs
INFO[0000] Working on domain name=instance-00000127
INFO[0000] Pinning VCPU on threads threads=16,40 vcpu=0
INFO[0000] Pinning VCPU on threads threads=17,41 vcpu=1
INFO[0000] Pinning VCPU on threads threads=18,42 vcpu=2
INFO[0000] Pinning VCPU on threads threads=19,43 vcpu=3
INFO[0000] Pinning VCPU on threads threads=20,44 vcpu=4
INFO[0000] Pinning VCPU on threads threads=21,45 vcpu=5
INFO[0000] Pinning VCPU on threads threads=22,46 vcpu=6
INFO[0000] Pinning VCPU on threads threads=23,47 vcpu=7
INFO[0000] Pinning VCPU on threads threads=0,24 vcpu=8
INFO[0000] Pinning VCPU on threads threads=1,25 vcpu=9
INFO[0000] Pinning VCPU on threads threads=2,26 vcpu=10
INFO[0000] Pinning VCPU on threads threads=3,27 vcpu=11
INFO[0000] Pinning VCPU on threads threads=4,28 vcpu=12
INFO[0000] Pinning VCPU on threads threads=5,29 vcpu=13
INFO[0000] Pinning VCPU on threads threads=6,30 vcpu=14
INFO[0000] Pinning VCPU on threads threads=7,31 vcpu=15
INFO[0000] Pinning VCPU on threads threads=8,32 vcpu=16
INFO[0000] Pinning VCPU on threads threads=9,33 vcpu=17
INFO[0000] Pinning VCPU on threads threads=10,34 vcpu=18
INFO[0000] Pinning VCPU on threads threads=11,35 vcpu=19
INFO[0000] Pinning VCPU on threads threads=12,36 vcpu=20
INFO[0000] Pinning VCPU on threads threads=13,37 vcpu=21
INFO[0000] Pinning VCPU on threads threads=14,38 vcpu=22
INFO[0000] Pinning VCPU on threads threads=15,39 vcpu=23
INFO[0000] Pinning VCPU on threads threads=16,40 vcpu=24
INFO[0000] Pinning VCPU on threads threads=17,41 vcpu=25
INFO[0000] Pinning VCPU on threads threads=18,42 vcpu=26
INFO[0000] Pinning VCPU on threads threads=19,43 vcpu=27
INFO[0000] Pinning VCPU on threads threads=20,44 vcpu=28
INFO[0000] Pinning VCPU on threads threads=21,45 vcpu=29
INFO[0000] Pinning VCPU on threads threads=22,46 vcpu=30
INFO[0000] Pinning VCPU on threads threads=23,47 vcpu=31
With multiple Domains on the host
$ lapinou -cli
INFO[0000] Domains founds count=3
INFO[0000] Enough CPUs to apply pinning on provisioned VCPUs
INFO[0000] Working on domain name=instance-00000006
INFO[0000] Pinning VCPU on threads cpu=16 threads=4,16 vcpu=0
INFO[0000] Pinning VCPU on threads cpu=17 threads=5,17 vcpu=1
INFO[0000] Pinning VCPU on threads cpu=18 threads=6,18 vcpu=2
INFO[0000] Pinning VCPU on threads cpu=19 threads=7,19 vcpu=3
INFO[0000] Pinning VCPU on threads cpu=20 threads=8,20 vcpu=4
INFO[0000] Pinning VCPU on threads cpu=21 threads=9,21 vcpu=5
INFO[0000] Pinning VCPU on threads cpu=22 threads=10,22 vcpu=6
INFO[0000] Pinning VCPU on threads cpu=23 threads=11,23 vcpu=7
INFO[0000] Working on domain name=instance-00000004
INFO[0000] Pinning VCPU on threads cpu=8 threads=8,20 vcpu=0
INFO[0000] Pinning VCPU on threads cpu=9 threads=9,21 vcpu=1
INFO[0000] Pinning VCPU on threads cpu=10 threads=10,22 vcpu=2
INFO[0000] Pinning VCPU on threads cpu=11 threads=11,23 vcpu=3
INFO[0000] Pinning VCPU on threads cpu=12 threads=0,12 vcpu=4
INFO[0000] Pinning VCPU on threads cpu=13 threads=1,13 vcpu=5
INFO[0000] Pinning VCPU on threads cpu=14 threads=2,14 vcpu=6
INFO[0000] Pinning VCPU on threads cpu=15 threads=3,15 vcpu=7
INFO[0000] Working on domain name=instance-00000003
INFO[0000] Pinning VCPU on threads cpu=4 threads=4,16 vcpu=0
INFO[0000] Pinning VCPU on threads cpu=5 threads=5,17 vcpu=1
INFO[0000] Pinning VCPU on threads cpu=6 threads=6,18 vcpu=2
INFO[0000] Pinning VCPU on threads cpu=7 threads=7,19 vcpu=3
Run it
Use it manually or inside a crontab. The work to daemonize the thing is in progress.
*/30 * * * * /usr/local/bin/lapinou -cli > /tmp/lapinou.log
If you want JSON logs
*/30 * * * * /usr/local/bin/lapinou -cli -jsonlog > /tmp/lapinou.log
Build and deploy Lapinou
To build Lapinou you will need a box/container with libvirt-dev installed, go and make. Then to build the binary :
make
To build the package (You will need FPM for that) :
make deb
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