CPU time for Win32 & GNAT

CPU time for Win32 & GNAT

[Gautier]

Hi!

Does someone know how to obtain the CPU time (or a CPU
duration...) for Win32 (under GNAT) in a simple way ?
The program doesn't use tasking and no more resolution
than the one of Duration is needed for time spans.
I'm sure someone has a ready-made function in his/her toolbox...

TIA

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Re: CPU time for Win32 & GNAT

[Pat Rogers]

"Gautier" <gautier_niouzes@hotmail.com> wrote in message
news:17cd177c.0110120321.3077bccf@posting.google.com...
> Hi!
>
> Does someone know how to obtain the CPU time (or a CPU
> duration...) for Win32 (under GNAT) in a simple way ?
> The program doesn't use tasking and no more resolution
> than the one of Duration is needed for time spans.
> I'm sure someone has a ready-made function in his/her toolbox...

Better yet, why not use the Pentium ReadTimeStampCounter (RDTSC)
instruction?  It samples the register that keeps a count of the number of
clock cycles since boot-up.  Given the exact clock speed you can compute
exactly how much time has elapsed between two samples.


with Interfaces;

package Pentium_Cycle_Counter is

  pragma Suppress( All_Checks );

  type Count is new Interfaces.Unsigned_64;

  function Sample return Count;

  pragma Inline( Sample );

end Pentium_Cycle_Counter;


with Machine_Code;

package body Pentium_Cycle_Counter is

  use Machine_Code;

  function Sample return Count is
    Result : Count;
  begin
    Asm( "RDTSC", Count'Asm_Output("=A",Result), Volatile => True );
    return Result;
  end Sample;

end Pentium_Cycle_Counter;


---
Patrick Rogers                       Consulting and Training in:
http://www.classwide.com          Real-Time/OO Languages
progers@classwide.com               Hard Deadline Schedulability Analysis
(281)648-3165                                 Software Fault Tolerance

Re: CPU time for Win32 & GNAT

[Ted Dennison]

In article <17cd177c.0110120321.3077bccf@posting.google.com>, Gautier says...
>Does someone know how to obtain the CPU time (or a CPU
>duration...) for Win32 (under GNAT) in a simple way ?
>The program doesn't use tasking and no more resolution
>than the one of Duration is needed for time spans.
>I'm sure someone has a ready-made function in his/her toolbox...

There's probably some neat little trick out there (have you tried using bash?).

I believe the programatic way to do it depends on your OS. For NT-based OS's,
you can gather "performance information" from the registry. That is how the NT
task manager and perfmon gather their information. For Win9x OS's, you have to
do it in a completely different way (which doesn't work on NT).

The current version of the SETI@Home Service uses the NT performance information
to check to see if certian executables are running (so that it can stop SETI
processing). If you download the source distribution, you can look at how it is
done. There's also an NT performance information helper package in there you can
use under the GPL, but its in a primitive state right now.

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Re: CPU time for Win32 & GNAT

[Ted Dennison]

In article <oyCx7.10592$Lz2.3580572774@newssvr30.news.prodigy.com>, Pat Rogers
says...
>
>"Gautier" <gautier_niouzes@hotmail.com> wrote in message
>news:17cd177c.0110120321.3077bccf@posting.google.com...
>> Does someone know how to obtain the CPU time (or a CPU
>> duration...) for Win32 (under GNAT) in a simple way ?
>> The program doesn't use tasking and no more resolution
>> than the one of Duration is needed for time spans.
>> I'm sure someone has a ready-made function in his/her toolbox...
>
>Better yet, why not use the Pentium ReadTimeStampCounter (RDTSC)
>instruction?  It samples the register that keeps a count of the number of
>clock cycles since boot-up.  Given the exact clock speed you can compute
>exactly how much time has elapsed between two samples.

I think he wants elapsed CPU time for his process, not for the whole system.
That would essentially just give him wall time (really really precise wall
time).

Is that instruction avalilable in ring 3?

---
T.E.D.    homepage   - http://www.telepath.com/dennison/Ted/TED.html

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Re: CPU time for Win32 & GNAT

[Pat Rogers]

"Ted Dennison" <dennison@telepath.com> wrote in message
news:tkDx7.26129$ev2.34679@www.newsranger.com...
> In article <oyCx7.10592$Lz2.3580572774@newssvr30.news.prodigy.com>, Pat
Rogers
> says...
> >
> >"Gautier" <gautier_niouzes@hotmail.com> wrote in message
> >news:17cd177c.0110120321.3077bccf@posting.google.com...
> >> Does someone know how to obtain the CPU time (or a CPU
> >> duration...) for Win32 (under GNAT) in a simple way ?
> >> The program doesn't use tasking and no more resolution
> >> than the one of Duration is needed for time spans.
> >> I'm sure someone has a ready-made function in his/her toolbox...
> >
> >Better yet, why not use the Pentium ReadTimeStampCounter (RDTSC)
> >instruction?  It samples the register that keeps a count of the number of
> >clock cycles since boot-up.  Given the exact clock speed you can compute
> >exactly how much time has elapsed between two samples.
>
> I think he wants elapsed CPU time for his process, not for the whole
system.
> That would essentially just give him wall time (really really precise wall
> time).
>
> Is that instruction avalilable in ring 3?

I can't say.  (I know I can trust you -- I just don't know!  :-)

Re: CPU time for Win32 & GNAT

[Ted Dennison]

In article <WoDx7.10597$sj3.3583583254@newssvr30.news.prodigy.com>, Pat Rogers
says...
>
>"Ted Dennison" <dennison@telepath.com> wrote in message
>news:tkDx7.26129$ev2.34679@www.newsranger.com...
>> In article <oyCx7.10592$Lz2.3580572774@newssvr30.news.prodigy.com>, Pat
>Rogers
>> says...
>> >Better yet, why not use the Pentium ReadTimeStampCounter (RDTSC)

>> Is that instruction avalilable in ring 3?
>
>I can't say.  (I know I can trust you -- I just don't know!  :-)

Well, I've found lots of examples of its use mixed with user calls from various
OS's, so I guess so. Thinking about it, I can't come up with any reason why it
would be a security or stability problem, but then again the bad guys are always
way more creative than I am. 

---
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Re: CPU time for Win32 & GNAT

[Sune Falck]

If you want to fetch elapsed time, cpu time in user mode and cpu time in
kernel mode
have a look at the system call GetProcessTimes.

A sample:

...
      Created : aliased Win32.Winbase.FILETIME;
      Exited  : aliased Win32.Winbase.FILETIME;
      User    : aliased Win32.Winbase.FILETIME;
      Kernel  : aliased Win32.Winbase.FILETIME;

      Ok          : Win32.BOOL;
   begin
      Ok :=  Win32.Winbase.GetProcessTimes (Win32.Winbase.GetCurrentProcess,
                                            Created'Unchecked_Access,
                                            Exited'Unchecked_Access,
                                            User'Unchecked_Access,
                                            Kernel'Unchecked_Access);
...

Sune Falck

Re: CPU time for Win32 & GNAT

[Gautier Write-only-address]

Ted:

> > I think he wants elapsed CPU time for his process, not for the whole
>system.
> > That would essentially just give him wall time (really really precise 
>wall
> > time).
> >
> > Is that instruction avalilable in ring 3?

Pat:

>I can't say.  (I know I can trust you -- I just don't know!  :-)

Effectively, I'm looking for the time elapsed during the
process, not the wall-clock time.

Ideally I'm looking for something like

  function Process_Clock return Process_Time;

and of course...

  function "-"(T2,T1:Process_Time) return Duration;

but just an indication of a Win32 function to use would already
be sufficient (I'll do the rest!).

Thx

Gautier


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Re: CPU time for Win32 & GNAT

[Gautier Write-only-address]

Sune Falck

>If you want to fetch elapsed time, cpu time in user mode and cpu time
>in kernel mode have a look at the system call GetProcessTimes.

Thank you very much! It seems to be exactly what I'm looking for.
____________________________________________________________
Gautier  --  http://www.mysunrise.ch/users/gdm/index.htm#Ada

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Re: CPU time for Win32 & GNAT

[Ted Dennison]

In article <mailman.1003089321.30613.comp.lang.ada@ada.eu.org>, Gautier
Write-only-address says...
>
>Ted:
>Ideally I'm looking for something like
>
>  function Process_Clock return Process_Time;
>
>and of course...
>
>  function "-"(T2,T1:Process_Time) return Duration;
>
>but just an indication of a Win32 function to use would already
>be sufficient (I'll do the rest!).

I'm glad to see someone came up with one for you (in another post).

The way I was talking about doing it (performance information from the registry)
is *way* more complicated than just making a single Win32 function call. There's
a series of at least 5 calls that have to be made, the way I remember it. That's
why I had to create a helper package for it.

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