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How to calculate application memory and cache memory like Activity Monitor in object C in Mac?

I am trying to write a MAC OSX system monitoring program (something similar to an activity monitor). I am using vm_statistics64_data_t to get "free_count, active_count, inactive_count" etc.

But I can't figure out the app memory correctly. I used

"vm_page_size * vmStats.internal_page_count"

to compute application memory, but it is out of sync with Activity Monitor.

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It looks like you've already found the answer. Leave it here for those who may find it useful.

To calculate the application memory value corresponding to the activity monitor, you need:



vm_page_size * (vm_stat.internal_page_count - vm_stat.purgeable_count)
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