Linux Specifies the cpu__linux of the process to run

If you think you know more about your process than the kernel's process scheduler, and you don't want to consume too much CPU0 and a higher cache hit, you can set up a process to run on one or some CPUs.

Redis is a single process model, in order to take full advantage of multi-core server performance, you can specify different Redis instances to run on different CPUs, which can also reduce process context switching.

There are two kinds of methods:

First, use the command taskset

In Redhat Linux, you can sudo yum privodes taskset find Taskset in which package, as follows:

UTIL-LINUX-2.23.2-26.EL7.X86_64:A collection of basic system utilities
Repo: @anaconda
Matched from:
Filename:/usr/bin/taskset
Can know is in util-linux-2.23.2-26.el7.x86_64, then sudo yum install util-linux can install.

A. Show which CPUs the process is running on

[Zhujiang@localhost ~]$ ps aux | grep Redis
Root 2884 0.1 0.2 37260 5372? SSL Mar10 3:53/usr/local/bin/redis-server *:6379
Zhujiang 17266 0.0 0.0 112648 956 pts/0 s+ 05:57 0:00 grep--color=auto Redis

[Zhujiang@localhost ~]$ taskset-p 2884
PID 2884 ' s current affinity mask:f
Display the result f indicates binary 1111, each 1 represents a CPU, the process is running on 4 CPUs, I This virtual machine is four CPU.

B. Specifies that the process is running on a CPU

[Zhujiang@localhost ~]$ sudo taskset-pc 2 2884
PID 2884 ' s current affinity list:0-3
PID 2884 ' s new affinity List:2
[Zhujiang@localhost ~]$
Note: 2 indicates that the process will only run on the 3rd CPU (counting from 0)

C. Specify CPU at process startup

[Zhujiang@localhost ~]$ taskset-c 0/usr/local/bin/redis-server

Ii. Use of sched_setaffinity

#include <stdio.h> #include <time.h> #include <stdlib.h> #define __USE_GNU #include <sched.h> in
    T main () {int cpu_id = 1;
    cpu_set_t Mask;
    Cpu_zero (&mask);

    Cpu_set (cpu_id, &mask);
        if (sched_setaffinity (0, sizeof (mask), &mask) < 0) {perror ("set affinity");
    return-1;
    } struct TIMESPEC ts;
    Clock_gettime (Clock_monotonic, &ts);
    int now = TS.TV_SEC; int end = Now + 20;
        Busy computing 10 seconds while (now < end) {Clock_gettime (clock_monotonic, &ts);
    now = ts.tv_sec;
    } cpu_zero (&mask);
    cpu_id = 3;
    
    Cpu_set (cpu_id, &mask);
        if (sched_setaffinity (0, sizeof (mask), &mask) < 0) {perror ("set affinity");
    return-1;
    } clock_gettime (Clock_monotonic, &ts);
    now = ts.tv_sec;
    End = Now + 10;
        while (now < end) {Clock_gettime (clock_monotonic, &ts);
    now = ts.tv_sec;

   } return 0;
 }