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via Mac OS X keyboard shortcuts.

How to view the System Processes and Performance on a Mac

Navigate to:

/Applications/Utilities folder/Activity Monitor

The Activity Monitor on the Mac is the equivalent of the Task Manager in Windows

The Activity Monitor displays the system processes, CPU/memory usage.

via Computer Tips and Tricks: Mac: View System Processes and Performance.

1. Open Terminal located at /Applications/Utilities/.

2. Type: top

3. Press Return to open the top utility in the Terminal window. Two rows near the top of the window, “PhysMem:” and “VM:” indicate overall physical RAM and virtual memory usage, respectively. The two columns on the right, “RSIZE” and “VSIZE” offer memory usage information per application. RSIZE indicates the amount of physical RAM in use by the application or process, in megabytes “M” or kilobytes “K”. VSIZE indicates the amount of virtual memory Mac OS X has assigned for this process or application, in megabytes “M” or gigabytes “G”.

4. When you are finished reviewing the information, press the Q key to exit top.

Notes

1. Application and process names are listed in the “COMMAND” column.

2. It is normal for some processes to use very little RAM, such as 64K.

3. Not all applications may have an easily-recognizable name in the Terminal window. For example: Microsoft Internet Explorer 5.1 appears as “Internet E.”

4. As with Process Viewer, Classic applications do not appear individually in the Process Listing window. It is normal for the Classic environment to appear as a single process TruBlueEnv.

5. top itself is listed because it is an open application. This is normal.

6. Type “man top” in the Terminal for more information on top.

via Mac OS X: How to View Memory Usage With the “top” Utility.

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