Use taskset to effectively control CPU resources

Reprint: http://hiadmin.com /? P = 1452
It is often felt that the system resources are insufficient, and no more than three important services can be run on a single machine. However, every day we need to perform backup compression and other operations on the machine, and the network will be transmitted for a long time, this affects the insufficient system resources;

At this time, we can limit some less important tasks, such as copy, backup, and synchronization, to a single CPU or a core of a multi-core CPU, although this is not necessarily the most effective method, it can maximize the use of valid resources to reduce the CPU resources occupied by less important processes;

View the CPU information in the system:

#cat /proc/cpuinfo

Taskset can help us complete this task, and the operation is very simple;

The tool is installed by default. The RPM package name is util-Linux.

#taskset --help
taskset (util-linux 2.13-pre7)
usage: taskset [options] [mask | cpu-list] [pid | cmd [args...]]
set or get the affinity of a process

-P,-pid operate on existing given PID
-C,-CPU-list display and specify CPUs in List format
-H,-help display this help
-V,-version output version information

Example:
1. enable a new process with only 0 CPU cores (job. Sh is your work script)

#taskset -c 0 sh job.sh

2. Find the existing process ID and adjust the CPU core usage of the process (23328 process ID used in the example)

# Taskset-PC 0 23328
PID 23328's current affinity list: 0-3 #0-3 indicates that all 4 cores are used for processing.
PID 23328's New Affinity list: 0 # adjusted to apply only 0-tag Single-core processing

3. Check the load in top

Finally, you can add this command in your work script to reasonably use the existing CPU resources;