hwloc-nox set CPU affinity in Linux

sudo apt-get install hwloc-nox
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
hwloc-nox
0 upgraded, 1 newly installed, 0 to remove and 530 not upgraded.
Need to get 151 kB of archives.
After this operation, 453 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu xenial/universe amd64 hwloc-nox amd64 1.11.2-3 [151 kB]
Fetched 151 kB in 0s (184 kB/s)
Selecting previously unselected package hwloc-nox.
(Reading database ... 224148 files and directories currently installed.)
Preparing to unpack .../hwloc-nox_1.11.2-3_amd64.deb ...
Unpacking hwloc-nox (1.11.2-3) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up hwloc-nox (1.11.2-3) ...
mint@mint ~ $ apt-cache search lstopo^C
mint@mint ~ $ lstopo
lstopo lstopo-no-graphics
mint@mint ~ $ lstopo-no-graphics
Machine (16GB total)
NUMANode L#0 (P#0 7962MB)
Package L#0
L3 L#0 (6144KB)
L2 L#0 (2048KB) + L1i L#0 (64KB) + Core L#0
L1d L#0 (16KB) + PU L#0 (P#0)
L1d L#1 (16KB) + PU L#1 (P#2)
L2 L#1 (2048KB) + L1i L#1 (64KB) + Core L#1
L1d L#2 (16KB) + PU L#2 (P#4)
L1d L#3 (16KB) + PU L#3 (P#6)
L2 L#2 (2048KB) + L1i L#2 (64KB) + Core L#2
L1d L#4 (16KB) + PU L#4 (P#8)
L1d L#5 (16KB) + PU L#5 (P#10)
L2 L#3 (2048KB) + L1i L#3 (64KB) + Core L#3
L1d L#6 (16KB) + PU L#6 (P#12)
L1d L#7 (16KB) + PU L#7 (P#14)
L3 L#1 (6144KB)
L2 L#4 (2048KB) + L1i L#4 (64KB) + Core L#4
L1d L#8 (16KB) + PU L#8 (P#16)
L1d L#9 (16KB) + PU L#9 (P#18)
L2 L#5 (2048KB) + L1i L#5 (64KB) + Core L#5
L1d L#10 (16KB) + PU L#10 (P#20)
L1d L#11 (16KB) + PU L#11 (P#22)
L2 L#6 (2048KB) + L1i L#6 (64KB) + Core L#6
L1d L#12 (16KB) + PU L#12 (P#24)
L1d L#13 (16KB) + PU L#13 (P#26)
L2 L#7 (2048KB) + L1i L#7 (64KB) + Core L#7
L1d L#14 (16KB) + PU L#14 (P#28)
L1d L#15 (16KB) + PU L#15 (P#30)
HostBridge L#0
PCIBridge
PCI 14e4:1639
Net L#0 "enp4s0f0"
PCI 14e4:1639
Net L#1 "enp4s0f1"
PCIBridge
PCI 14e4:1639
Net L#2 "enp5s0f0"
PCI 14e4:1639
Net L#3 "enp5s0f1"
PCIBridge
PCI 103c:323a
PCI 1002:4390
PCI 1002:439c
Block(Removable Media Device) L#4 "sr0"
PCIBridge
PCI 1002:515e
GPU L#5 "renderD128"
GPU L#6 "card0"
GPU L#7 "controlD64"
NUMANode L#1 (P#2 8032MB) + Package L#1
L3 L#2 (6144KB)
L2 L#8 (2048KB) + L1i L#8 (64KB) + Core L#8
L1d L#16 (16KB) + PU L#16 (P#1)
L1d L#17 (16KB) + PU L#17 (P#3)
L2 L#9 (2048KB) + L1i L#9 (64KB) + Core L#9
L1d L#18 (16KB) + PU L#18 (P#5)
L1d L#19 (16KB) + PU L#19 (P#7)
L2 L#10 (2048KB) + L1i L#10 (64KB) + Core L#10
L1d L#20 (16KB) + PU L#20 (P#9)
L1d L#21 (16KB) + PU L#21 (P#11)
L2 L#11 (2048KB) + L1i L#11 (64KB) + Core L#11
L1d L#22 (16KB) + PU L#22 (P#13)
L1d L#23 (16KB) + PU L#23 (P#15)
L3 L#3 (6144KB)
L2 L#12 (2048KB) + L1i L#12 (64KB) + Core L#12
L1d L#24 (16KB) + PU L#24 (P#17)
L1d L#25 (16KB) + PU L#25 (P#19)
L2 L#13 (2048KB) + L1i L#13 (64KB) + Core L#13
L1d L#26 (16KB) + PU L#26 (P#21)
L1d L#27 (16KB) + PU L#27 (P#23)
L2 L#14 (2048KB) + L1i L#14 (64KB) + Core L#14
L1d L#28 (16KB) + PU L#28 (P#25)
L1d L#29 (16KB) + PU L#29 (P#27)
L2 L#15 (2048KB) + L1i L#15 (64KB) + Core L#15
L1d L#30 (16KB) + PU L#30 (P#29)
L1d L#31 (16KB) + PU L#31 (P#31)

Set your affinity

taskset -p ps aux^C
mint mint # ps aux|grep kvm
root 1306 0.0 0.0 0 0 ? S< Aug17 0:00 [kvm-irqfd-clean]
root 3724 0.0 0.0 91656 5056 pts/3 S+ 16:44 0:00 sudo qemu-system-x86_64 -m 11264 -smp 1 -net tap -net nic -enable-kvm -cpu host -drive file=/dev/sda
root 3725 8.7 45.2 12405860 7413032 pts/3 Sl+ 16:44 11:34 qemu-system-x86_64 -m 11264 -smp 1 -net tap -net nic -enable-kvm -cpu host -drive file=/dev/sda
root 3759 0.0 0.0 0 0 ? S 16:44 0:00 [kvm-pit/3725]
root 5234 0.0 0.0 14224 980 pts/6 S+ 18:56 0:00 grep --color=auto kvm
mint mint # taskset -pc 31 3725
pid 3725's current affinity list: 0-31
pid 3725's new affinity list: 31
mint mint # taskset -pc 30,31 3725
pid 3725's current affinity list: 31
pid 3725's new affinity list: 30,31

In the above command I set the affinity to core 31 and then changed it to cores 30 and 31.


Tags:

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