how to compute percentage of CPU used by an app

Asked Nov 13 '18 at 20:58

Active Nov 13 '18 at 20:58

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I am working on c++ application for Mac OS

There I would like to get percentage of CPU that my app is using.

I have seen getrusage() gives me cpu time used by the app.

   timeval userCPU = usage.ru_utime;
   timeval sysCPU = usage.ru_stime;

Do both values in the struct store cpu time consumed by the app. Is there any way to get cpu time used by the whole computer?

If not, how can I get the percentage?

Thanks in advance

asked Nov 13 '18 at 20:58

RuLoViC

See if theres a mac equivalent to https://learn.microsoft.com/en-us/windows/desktop/perfctrs/examples. Im sure that if they have a task manager there is something that must do the polling. – Bwebb Nov 13 '18 at 21:28
Does MacOS has `/proc/stat` file ? – KamilCuk Nov 13 '18 at 23:02
@KamilCuk nop, it does not – RuLoViC Nov 13 '18 at 23:16
I thjink look [here](https://stackoverflow.com/questions/63166/how-to-determine-cpu-and-memory-consumption-from-inside-a-process) – KamilCuk Nov 13 '18 at 23:22
I did, but there no method to get cpu for only one app, only total CPU. Any other ideas please ? – RuLoViC Nov 15 '18 at 10:21
Looks like you need this: https://stackoverflow.com/a/8737816/4434329 – Nov 15 '18 at 18:00
no, that way computes cpu load counting all apps not only "mine" – RuLoViC Nov 16 '18 at 07:25
No ideas anyone? – RuLoViC Nov 17 '18 at 13:32

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