SB61G2 only 50% cpu utilisation in task manager

After building our 3gig system we eagerly loaded our main application
to see how much faster it would run. Sadly it only runs at the same
speed as our old 2.2gig Athlon. We've enabled hyperthreading but XP
pro taskmanager only shows 50-60% utilisation where we normally see
100%.

Any ideas ????

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Paul Tait

In message <>, Paul Tait
wrote

>After building our 3gig system we eagerly loaded our main application
>to see how much faster it would run. Sadly it only runs at the same
>speed as our old 2.2gig Athlon. We've enabled hyperthreading but XP
>pro taskmanager only shows 50-60% utilisation where we normally see
>100%.
>
>Any ideas ????
>

Is your application multithreaded to any significant degree? If not it
is unlikely to run any faster (perhaps ever slower) with hyperthreading
enabled.

I'm unsure about the taskmanager issue, never having used a dual cpu or
smt system, does it show 50% usage for a single threaded kernel? If so
I'd suggest this is simply an illustration that your application is
single threaded. A second possibility could be that your program is IO
bound (this would handily explain why its running no faster the previous
athlon) and you need to look elsewhere in the system to gain
performance.

As to being no faster than an Athlon, there's the possibility that the
app is IO bound as mentioned. Alternatively, was it compiled with a P4
aware compiler. The P4 tends to suffer quite badly with code optimised
for previous IA32 implementations where as the Athlon copes relatively
well. Solution here would be to recompile the application with a recent
release of your compiler.

--
Dave Cunningham dave at upsilon org uk
PGP KEY ID: 0xA78636DC

The application is a plain MFC app. During its calculation phase it is
99.99% cpu bound on every machine we've ever run it on. The
taskmanager just sits on 99-100% utilisation. I tried setting the
processor affinity but got the same results. I can't believe that
hyperthreading changes a 3gig processor into 2 1.5gig processors!!!

dave cunningham <spam@[127.0.0.1]> wrote in message news:<runtYhB8F$C$>...
> In message <>, Paul Tait
> wrote
>
> >After building our 3gig system we eagerly loaded our main application
> >to see how much faster it would run. Sadly it only runs at the same
> >speed as our old 2.2gig Athlon. We've enabled hyperthreading but XP
> >pro taskmanager only shows 50-60% utilisation where we normally see
> >100%.
> >
> >Any ideas ????
> >
>
> Is your application multithreaded to any significant degree? If not it
> is unlikely to run any faster (perhaps ever slower) with hyperthreading
> enabled.
>
> I'm unsure about the taskmanager issue, never having used a dual cpu or
> smt system, does it show 50% usage for a single threaded kernel? If so
> I'd suggest this is simply an illustration that your application is
> single threaded. A second possibility could be that your program is IO
> bound (this would handily explain why its running no faster the previous
> athlon) and you need to look elsewhere in the system to gain
> performance.
>
> As to being no faster than an Athlon, there's the possibility that the
> app is IO bound as mentioned. Alternatively, was it compiled with a P4
> aware compiler. The P4 tends to suffer quite badly with code optimised
> for previous IA32 implementations where as the Athlon copes relatively
> well. Solution here would be to recompile the application with a recent
> release of your compiler.