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Retrieve or set a processes's CPU affinity(亲和).
This requires sched_{g,s}etaffinity support in your libc.
1. busybox
cd ~/source-code/mc40/buildroot-2020.02.8
make busybox-menuconfig
Linux System Utilities --->
[*] taskset (4.2 kb)
2. make
make -j8
/output/target/usr/bin/taskset
3. uasge
/ # taskset --help
BusyBox v1.31.1 (2020-12-03 14:56:00 CST) multi-call binary.
Usage: taskset [-p] [HEXMASK] PID | PROG ARGS
Set or get CPU affinity
-p Operate on an existing PID
3.1 在特定CPU运行应用
taskset cpu prog
taskset 1 ping 10.126.11.254 -c 10 &
taskset 2 ping 10.126.11.254 -c 10 &
taskset 4 ping 10.126.11.254 -c 10 &
taskset 8 ping 10.126.11.254 -c 10 &
run ping at cpu3:
taskset 8 ping 10.126.11.254 -c 10 &
3.2为已经运行的应用切换CPU
taskset -p cpu pid
1) ping is running at cpu2
2) switch to cpu1
taskset -p 2 1389
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