System Activity Monitor

for iPhone and iPod Touch

Also available: System Activity Monitor for iPad


System Activity Monitor

Use the System Activity Monitor to diagnose your iPhone problems.

You can view:

  1. -Runtime (RAM) memory usage

  2. -Storage (Disk) usage

  3. -All running processes

  4. -CPU usage

  5. -WiFi and Cellular IP addresses

  6. -MAC addresses

  7. -Device information


Runtime Memory is the amount of RAM your device has. This is typically 128 MB on the iPhone 3G, 256 MB on the iPhone 3GS and 512MB on the iPhone 4.

Free memory

This memory is not being used currently

Wired memory

This information can't be moved to disk, so it must stay in RAM. The amount depends on the applications you are using.

Active memory

This information is currently in RAM and has recently been used.

Inactive memory

This information has not recently been used but will remain in RAM until another application needs more memory but no free memory is available. If called upon by a process, this is quickly changed to Active memory; if it has been swapped to the hard disk, it will be moved back to RAM and marked as Active.

Page ins / Page outs

"Page ins/outs" refers to the amount of information moved between RAM and the hard disk. This number is cumulative amount of data that iPhone OS has moved between RAM and disk space.


Disk info shows the amount of space used or available on your iPhone. This is the amount of storage used for Music, Video and apps.

For support, email


All running processes with their process IDs are displayed here. Some Apple apps continue to run in the background even though you have ‘closed’ them.


The CPU usage as reported by the OS is shown in a graph. The usage does not change much as the iPhone OS puts background applications to sleep.

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