From: x1 <caldridge@...>
Date: 2005-11-11T11:20:02+09:00
Subject: Re: [SORTA OT] Getting CPU usage of a process

Seems to be lots of win32ole stuff that's usefull here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/wmi_tasks__performance_monitoring.asp

this seems tto work ok on a process name but.. not sure how to do it on an id..
wscript.exe test.vbs
-------test.vbs-------
strComputer = "."
Set objWMIService = GetObject("winmgmts:" _
    & "{impersonationLevel=impersonate}!\\" _
    & strComputer & "\root\cimv2")
set PerfProcess = objWMIService.Get(_
    "Win32_PerfFormattedData_PerfProc_Process.Name='Idle'")

While (True)
    PerfProcess.Refresh_
    Wscript.Echo PerfProcess.PercentProcessorTime
    Wscript.Sleep 1000
Wend
--------/test.vbs--------



On 11/10/05, Joe Van Dyk <joevandyk@gmail.com> wrote:
> On 11/10/05, Joe Van Dyk <joevandyk@gmail.com> wrote:
> > On 11/10/05, Kero <kero@chello.single-dot.nl> wrote:
> > > > I'd like to be able to get the CPU usage of a particular process.
> > > > What are my options for doing so from Ruby?
> > > >
> > > > I've found the libgtop ruby binding, and I could use that, but I would
> > > > rather not bring in another dependency.  This will run on Linux
> > > > systems only.
> > > >
> > > > And would I want to use the elapsed real cpu time?  Or the sum of the
> > > > elapsed user and system cpu time?  (and then I believe I divide that
> > > > by the elapsed wall clock time)
> > >
> > > man proc, look for "/proc/[number]/stat"
> > > It contains a set of times spent by the process and its children.
> > > it also contains the starttime, so this should allow you to compute "Cpu
> > > usage of the process".
> >
> > Thanks, I'm aware of /procproc.
> >
> > I want to be able to constantly keep the user updated on how much of
> > the cpu the application is using.
> >
> > Would I take the sum of the elapsed user and system cpu time and
> > divide that by the elapsed wall clock time to get the current cpu
> > percentage?
>
> And one other question, does anyone know how I might do this on
> Windows via Ruby?
>
>