One core exclusively for my process [duplicate]

别来无恙 提交于 2019-11-28 15:48:41

Yes, there is. You want to create two cpusets, one with your isolated CPU and the other with all the rest of the CPUs. Assign your special process to the isolated cpuset and all the rest of the processes to the other cpuset.

Here is a simple example script that will do it:

mkdir /cpuset 
mount -t cpuset none /cpuset/
cd /cpuset

mkdir sys                                   # create sub-cpuset for system processes
/bin/echo 0-2 > sys/cpuset.cpus             # assign cpus (cores) 0-2 to this set
                                            # adjust if you have more/less cores
/bin/echo 1 > sys/cpuset.cpu_exclusive
/bin/echo 0 > sys/cpuset.mems     

mkdir rt                                    # create sub-cpuset for my process
/bin/echo 3 > rt/cpuset.cpus                # assign cpu (core) 3 to this cpuset
                                            # adjust this to number of cores-1
/bin/echo 1 > rt/cpuset.cpu_exclusive
/bin/echo 0 > rt/cpuset.mems
/bin/echo 0 > rt/cpuset.sched_load_balance
/bin/echo 1 > rt/cpuset.mem_hardwall

# move all processes from the default cpuset to the sys-cpuset
for T in `cat tasks`; do echo "Moving " $T; /bin/echo $T > sys/tasks; done

Now start your process and find out its PID and go:

/bin/echo $PID > /cpuset/rt/tasks

If you want to revert these changes, just restart your system or do:

# move tasks back from sys-cpuset to root cpuset
for T in `cat /cpuset/sys/tasks`; do echo "Moving " $T; /bin/echo $T > /cpuset/tasks; done
# remove sys-cpuset
rmdir /cpuset/sys
# move tasks back from rt-cpuset to root cpuset
for T in `cat /cpuset/rt/tasks`; do echo "Moving " $T; /bin/echo $T > /cpuset/tasks; done
# remove rt-cpuset
rmdir /cpuset/rt
# unmount and remove /cpuset
umount /cpuset
rmdir /cpuset

Here is the man page: http://www.kernel.org/doc/man-pages/online/pages/man7/cpuset.7.html

There are also more complicated shell wrappers that can help you automate this, such as cset. See: http://web.archive.org/web/20120428093126/http://www.suse.com/documentation/slerte_11/slerte_tutorial/data/slerte_tutorial.html

You can have a look at this lwn article for a discussion of kernel solution to this problem.

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