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Should processing power be released quickly? You can easily do this by stopping and then restarting the active process or application later in Mac OS X. Technically, this is “stopping” and “continuing” the process, but Stopping should not be confused with more aggressive killing. or force applications to terminate so it is often easier to distinguish between the two terminology terminate or stop.
This means you can take a process that consumes 100% of the processor and temporarily pause it while you do something else, and resume after you’re ready to let the process do its thing. This is done on the command line, and we discuss two different ways to do it using the kill and kill commands with the -STOP and -CONT flags. Ideally, you’ll have some command line facility and knowledge before using this, but it’s not really necessary.
Before you begin, start the Terminal application located in the /Applications/Utilities/ directory and also start the Activity Monitor in the same folder.
Pause a process or application in Mac OS X.
The basic syntax for suspending a request, where the PID is the identifier of the process to be suspended, is as follows:
kill -STOP PID
A PID is always a number, and every process running on a Mac has an associated ID.
If you are familiar with retrieving process IDs, you already know what to do with the above commands only, but if not, we will deal with it next time, so we launched the “Activity Monitor”
Find the PID and stop the associated process
This is a more user-friendly method that uses Monitoring Activity:
- In Activity Monitor, use the search function in the top right corner and enter the name of the application you want to pause (eg iTunes)
- When the corresponding processes and/or applications appear, look for the process ID in the PID column
- Add the corresponding PID to the kill command above, as follows:
- Note that the CPU ID activity of the processor is now 0%, indicating that the process has been terminated (technically stopped)
kill -STOP 3138
Don’t forget PID or better, do not close the Terminal window yetbecause with the same PID you can continue the application to continue using it again.
The effect of stopping a process on CPU usage is dramatic, this screenshot shows that iTunes consumes 70% of the processor while running Visualizer, and the same iTunes process after stopping it with a STOP flag. The process is literally over:
Those with more command lines may prefer to use ps instead of Activity Monitor, which is very easy:
ps aux | grep Name
Replace “Name” with the start of the process or application name, find the PID and put it in the kill command:
kill -STOP 92841
It doesn’t matter if you use Monitor Activity or ps to retrieve the PID, as long as you enter the correct process ID when you kill kill.
Note that when you are using a suspended application, it almost always tries to see the Rolling Death Beach minus the CPU usage. So if you want to use the app again, you have to “continue” it.
Continue application or stopped process
Restarting a paused or paused application is simple, just change the kill order a bit and use the same process ID you retrieved from the previous steps:
kill -CONT PID
For example, to extend the iTunes application using the previous PID:
killing -CONT 3138
And now iTunes becomes a usable cursor, minus waiting for rotating again. In addition, we return to any previous level of CPU consumption.
The screenshot below shows this trick using both kill and killall commands:
Using -STOP and -CONT with the killall is basically the same, but it has some limitations in terms of names, so we discussed a more direct way to use the PID-based method. However, this is also reflected in the guild.
Pause and resume applications by application name
If you know the exact application or process name, you can stop the processes with the ‘killall’ command with the -STOP flag. This can be easier for apps that are easy to identify by name, but have limitations in working with complex names, or that interfere with a given process with duplicate processes with the same name (like a separate Chrome tab ) or a window that shuffles many ” Google Chrome Renderer “processes), so we addressed the PID approach first because it is much simpler.
The basic stop order for the guild is as follows:
killall -STOP AppName
Not sure what the app is called? Use ps and grep:
ps aux | grep request name
For example, you can find “Chrome” to find all processes named “Chrome”:
ps aux | group chrome
Or you can target the process with a specific application name, for example:
killall -STOP -c “Google Chrome”
Continuous processes and requests with guild means changing the flag from -STOP to -CONT, everything else is the same:
killall -CONT request name
For example, to continue a request with a long name:
killall -CONT -c “Google Chrome”
Again, the application/process continues to run as normal, and CPU usage returns to where it was before the break.
Killall can directly affect applications or processes whose names do not have spaces, without flags or other indicators like iTunes.
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