User time and kernel time

Ben Taylor · Joined: 04 Oct 2007 Posts: 14

Does anyone know what 'kernel' time and 'user' time are?
It appears that using an application causes it to use some
of both, and leaving it idle causes the total used value
for both to stay the same - but what is the difference
between them, and what determines which of them it is
using?
Is there any way you can post a message to a window that
will cause it to use up either some kernel time or
usertime or both, but won't significantly affect the
contents of the application? It's only important for
applications that have got windows, because those that
don't will be using lots of time up anyway.

Archived from group: microsoft>public>vb>general>discussion

Angus Lepper · Joined: 04 Oct 2007 Posts: 10

I believe:

User Time: Time running for the user.
Kernel Time: Time spent with the Os Kernel.

(Somehow I probably just made a fool of myself. If so: Oooooooooooops.)

Angus
"Ben Taylor" wrote in message$086f7180$a101280a@phx.gbl...
> Does anyone know what 'kernel' time and 'user' time are?
> It appears that using an application causes it to use some
> of both, and leaving it idle causes the total used value
> for both to stay the same - but what is the difference
> between them, and what determines which of them it is
> using?
> Is there any way you can post a message to a window that
> will cause it to use up either some kernel time or
> usertime or both, but won't significantly affect the
> contents of the application? It's only important for
> applications that have got windows, because those that
> don't will be using lots of time up anyway.
>

Ben Taylor · Joined: 04 Oct 2007 Posts: 67

See answer to 'NO CARRIER', original poster 'Sylvain', 02/11/2003 14:23.

"Angus Lepper" wrote in message@TK2MSFTNGP12.phx.gbl...
> I believe:
>
> User Time: Time running for the user.
> Kernel Time: Time spent with the Os Kernel.
>
> (Somehow I probably just made a fool of myself. If so: Oooooooooooops.)
>
> Angus
> "Ben Taylor" wrote in message
> $086f7180$a101280a@phx.gbl...
> > Does anyone know what 'kernel' time and 'user' time are?
> > It appears that using an application causes it to use some
> > of both, and leaving it idle causes the total used value
> > for both to stay the same - but what is the difference
> > between them, and what determines which of them it is
> > using?
> > Is there any way you can post a message to a window that
> > will cause it to use up either some kernel time or
> > usertime or both, but won't significantly affect the
> > contents of the application? It's only important for
> > applications that have got windows, because those that
> > don't will be using lots of time up anyway.
> >
>
>

Tom Esh · Joined: 04 Oct 2007 Posts: 416

On Thu, 27 Nov 2003 07:49:25 -0800, "Ben Taylor"
wrote:

>Does anyone know what 'kernel' time and 'user' time are?
>It appears that using an application causes it to use some
>of both, and leaving it idle causes the total used value
>for both to stay the same - but what is the difference
>between them, and what determines which of them it is
>using?

User mode is what applications run in, using address space provided
for applications. Kernel mode is reserved for the OS (and drivers).
Apps cannot access kernel mode directly. When necessary (for example
to process GDI Api functions), the OS will access kernel mode on an
app's behalf. AFIK, system idle time is considered neither.

>Is there any way you can post a message to a window that
>will cause it to use up either some kernel time or
>usertime or both, but won't significantly affect the
>contents of the application?

Why would you want to do that ...or care for that matter?
Also what is application "contents"?
Anyhow, which calls use kernel mode is not something I've paid much
attention to, but I think GDI calls for one should increase it. It's
also likely to take a lot of calls to make any sort of noticable
difference, especially on something like a P4 3ghz.

>...It's only important for
>applications that have got windows, because those that
>don't will be using lots of time up anyway.
Not following you at all there. Whether an app has windows (visible or
not) has little to do with how much cpu time it uses.

-Tom
MVP - Visual Basic
(please post replies to the newsgroup)

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