How to retrieve the % of memory pressure using native libraries

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Is there any way to retrieve the memory pressure percentage using native libraries?

When I run the memory-pressure command, I can see the percentage of free memory, but I’d like to retrieve the same information using a native library.

Answered by DTS Engineer in 864218022

Is there any way to retrieve the memory pressure percentage using native libraries?

Be careful here. In any non-trivial VM-based OS, free memory isn’t a useful statistic. I talk about this in On Free Memory.

In most cases you want to respond to memory pressure notifications. You can get those via Dispatch; see the makeMemoryPressureSource(eventMask:queue:) function.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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Answer 1

ssmith_c OP

1w

Accepted Answer

the source code of memory_pressure is here: https://github.com/apple-oss-distributions/system_cmds/blob/e0c267e80e451b9441ec4f4bb05dd72f0b49d596/memory_pressure/memory_pressure.c

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Answer 2

DTS Engineer OP

Apple

1w

Recommended

Is there any way to retrieve the memory pressure percentage using native libraries?

Be careful here. In any non-trivial VM-based OS, free memory isn’t a useful statistic. I talk about this in On Free Memory.

In most cases you want to respond to memory pressure notifications. You can get those via Dispatch; see the makeMemoryPressureSource(eventMask:queue:) function.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

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