CPU usage per process

[sergeyb]

I've encountered a problem determining CPU Usage per process (like Windows Task Manager knows to show).
Anybody wrote such a program?
Thanks for helping.

[Caprice]

GetProcessTimes - the function can halp you.
And Richter or MSDN. Just call the function. What to do under Windows'95 I don't know.

[sergeyb]

I tried this one. As far as I got from MSDN, it doesn't compute CPU usage...
Thanks anyway.

[Andreas Masur]

Well...you did not specify whether you wanted to have the CPU usage by times or by percentage... :cool:

Anyway...I do not have source code since I never did it yet but you can call 'NtQuerySystemInformation()' to get this information. To get some source code take a look at http://www.planet-source-code.com/vb/scripts/ShowZip.asp?lngWId=3&lngCodeId=549&strZipAccessCode=ODE%5F5494157

I am also not sure but as far as I remember this does not split it into separate processes...

[Caprice]

Try to search Perfmon. I have the program with the source code. I think I took it here. As I see you need functions like PdhOpenQuery and so far.

[dimm_coder]

I wrote such type of program for Win NT/2000/XP.
U can use such possibilities:
1) As Andreas have already said, U can use
NtQuerySystemInformation undocumented function;
2) U can read it from hiden registry hive HKEY_PERFORMANCE_DATA, if U will know it structure;
3) Use PDH library.
4) GetProcessTimes.
About 2) and 3) U can read from MSDN.
from 1)-3) u can get different info about processes, but from 4) only time (not in % like U can easy get from 1)-3) ).

For 9x there are another ways:
1) write vxd driver for getting information;
2) as i remember somewhere in the registry there is keys for all system processor usage ( krnl/user mode), but not for each process.
So U have only 1).