Hi,
Is there a module or some sample code that will let one find out the CPU
usage of a given process in percentages? This figure is highly useful and
can be viewed in XP's task manager. However, none of the other tools I've
seen, including XP's tasklist and Sysinternal's process tools, let you get
at the CPU Usage as such. Many do offer the CPU time, however. I'd like to
experiment with changing process priorities in case of serius peaks in CPU
usage. Thus, a metric of how well the system performs and which processes
hog the CPU the most would be just what I need, I guess.
I've installed some related Win32 modules using PPM including
perflib and process:: info, memory and perf.
I've Googled and read related bits of MSDN with little luck so far. seems
there are two performance interfaces an NT specific one and the other based
on Windows management instrumentation. However, both seem highly abstract
and complex to work with and might not even offer the CPU usage as such.
To be sure, I launched the perfmon application in XP and went through the
list of counters. You do get to user and kernel times on a per process basis
as well as elapsed CPU time, but again I didn't see anything related to the
CPU usage in the list. In Task manager's view/choose column dialog, the
entry goes by the name CPU Usage and is shown by default.
So, does either WMI or the NT performance counters let me access the CPU
Usage directly? If this is not the case, what kind of workarounds or other
means do I have? For example, what do the 3rd party task manager
replacements use?
I've checked the Win32 API functions in MSDN and as expected, did not find
the CPu usage there, either. Even though I found references to some
previously undocumented and interesting NT funcs like
NtQuerySystemInformation. Another thought that struck me would be to monitor
which Win32 API functions taskmgr.exe itself employs, using some free Win32
API monitors out there. However, this job seems difficult as I really don't
know what kind of activity I should be looking for, that is by which name
the function might go by.
Any help greatly appreciated as usual.
--
With kind regards Veli-Pekka Tätilä ([EMAIL PROTECTED])
Accessibility, game music, synthesizers and programming:
http://www.student.oulu.fi/~vtatila/
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