Activity Monitor User Guide
You can see the amount of system memory being used on your Mac.
In the Activity Monitor app on your Mac, click Memory (or use the Touch Bar) to see the following in the bottom of the window:
Memory Pressure: Graphically represents how efficiently your memory is serving your processing needs.
Memory pressure is determined by the amount of free memory, swap rate, wired memory, and file cached memory.
Physical Memory: The amount of RAM installed.
Memory Used: The amount of RAM being used. To the right, you can see where the memory is allocated.
App Memory: The amount of memory being used by apps.
Wired Memory: Memory required by the system to operate. This memory can’t be cached and must stay in RAM, so it’s not available to other apps.
Compressed: The amount of memory that has been compressed to make more RAM available.
When your computer approaches its maximum memory capacity, inactive apps in memory are compressed, making more memory available to active apps. Select the Compressed Memory column, then look in the VM Compressed column for each app to see the amount of memory being compressed for that app.
Cached Files: The size of files cached by the system into unused memory to improve performance.
Until this memory is overwritten, it remains cached, so it can help improve performance when you reopen the app.
Swap Used: The amount of space being used on your startup disk to swap unused files to and from RAM.
To display more columns, choose View > Columns, then choose the columns you want to show.
You can use Activity Monitor to determine if your Mac could use more RAM.
Anybody who uses Xcode will know overtime simulators for watchOS, tvOS, iOS versions gets longer plus take-up more disk space, but how do you delete older versions since there isn't a delete button?
Well here is a quick snippet showing where and what files to delete to make more space.
Note: Used for Xcode version 9 so unsure about lower versions.
Delete them in the Developer Tools Simulator:
Steam Games Not Launching Mac Catalina.
In the Xcode navigation choose Xcode > Open Developer Tool > Simulator.
Now in Simulator choose the following in the navigation Hardware > Device > Manage Devices.
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Then from the popup choose the Simulators tab and from the list of simulators just highlight the relevant simulator and press the delete button. You can also press the ctrl to get a popup menu when selecting the simulator.
Next delete the files on your drive:
First quit Xcode and go to the following directory.
And inside there you will find several dmg files, just delete the relevant simulator files such as com.apple.pkg.iPhoneSimulatorSDK11_3-11.dmg as an example.
Then go to the following directory.
Again choose the relevant simulator you want to delete such as iOS 8.1.simruntime for example.
Now restart Xcode and all the items will no longer be available plus you will have made a few gigabytes of space.
Online Mac Os Simulator
Note: If you forget and want to install them again choose the following Xcode > Preferences > Components tab.
Mac Os Simulator Download
Hope you find this little snippet handy.