32x apps in XP 64x

[LifeOnMars]

Hi there
Do 32bit apps, such as a password cracking applications run at a 64bit
'mode' when installed and run in a 64bit environment?

I have a dual core 2GH laptop and have installed Windows XP Pro 64bit on it
to speed up the password crunching process but the application is not
specifically designed for a 64bit environment. Am I clutching on straws?

Thank you
LifeOnMars

 

[Charlie Russel - MVP]

Re: 32x apps in XP 64x

You won't see any improvement, I'm afraid. 32-bit applications run in the
WOW64 layer, which is a very thin shim that allows 32-bit programs to work
in a 64-bit OS. Some operations do see some improvement from the 64-bit OS
(I/O operations, mostly, IME), but others see a slight slowdown, which tends
to balance things out. Overall, I'd say there's no difference in speed,
UNLESS the application is memory bound, and the availability of a larger
virtual memory address space (4GB per process, instead of 3GB per process)
is able to be used.

--
Charlie.
http://msmvps.com/xperts64
http://mvp.support.microsoft.com/profile/charlie.russel


"LifeOnMars" <LifeOnMars@discussions.microsoft.com> wrote in message
news:5C575396-D059-49F3-A141-B9D0B2B0324E@microsoft.com...
> Hi there
> Do 32bit apps, such as a password cracking applications run at a 64bit
> 'mode' when installed and run in a 64bit environment?
>
> I have a dual core 2GH laptop and have installed Windows XP Pro 64bit on
> it
> to speed up the password crunching process but the application is not
> specifically designed for a 64bit environment. Am I clutching on straws?
>
> Thank you
> LifeOnMars

 

[Shehbaz Afzal]

Re: 32x apps in XP 64x

Thank you Charlie, all makes sense now, I can confirm the app is running at a
slightly higher speed but that may well be because of the physical and
virtual memory available. The Task Manager shows both processors 50%!

Many thanks
--
Shehbaz Afzal, MCP Windows XP


"Charlie Russel - MVP" wrote:

> You won't see any improvement, I'm afraid. 32-bit applications run in the
> WOW64 layer, which is a very thin shim that allows 32-bit programs to work
> in a 64-bit OS. Some operations do see some improvement from the 64-bit OS
> (I/O operations, mostly, IME), but others see a slight slowdown, which tends
> to balance things out. Overall, I'd say there's no difference in speed,
> UNLESS the application is memory bound, and the availability of a larger
> virtual memory address space (4GB per process, instead of 3GB per process)
> is able to be used.
>
> --
> Charlie.
> http://msmvps.com/xperts64
> http://mvp.support.microsoft.com/profile/charlie.russel
>
>
> "LifeOnMars" <LifeOnMars@discussions.microsoft.com> wrote in message
> news:5C575396-D059-49F3-A141-B9D0B2B0324E@microsoft.com...
> > Hi there
> > Do 32bit apps, such as a password cracking applications run at a 64bit
> > 'mode' when installed and run in a 64bit environment?
> >
> > I have a dual core 2GH laptop and have installed Windows XP Pro 64bit on
> > it
> > to speed up the password crunching process but the application is not
> > specifically designed for a 64bit environment. Am I clutching on straws?
> >
> > Thank you
> > LifeOnMars
>
>

 

[Shehbaz Afzal]

Re: 32x apps in XP 64x

Thank you Charlie. There is no improvement in app performance well not worth
noticing anyway. But something worth mentioning I thought was that Task
Manager shows both processors at 50%

Many thanks
--
Shehbaz Afzal, MCP Windows XP


"Charlie Russel - MVP" wrote:

> You won't see any improvement, I'm afraid. 32-bit applications run in the
> WOW64 layer, which is a very thin shim that allows 32-bit programs to work
> in a 64-bit OS. Some operations do see some improvement from the 64-bit OS
> (I/O operations, mostly, IME), but others see a slight slowdown, which tends
> to balance things out. Overall, I'd say there's no difference in speed,
> UNLESS the application is memory bound, and the availability of a larger
> virtual memory address space (4GB per process, instead of 3GB per process)
> is able to be used.
>
> --
> Charlie.
> http://msmvps.com/xperts64
> http://mvp.support.microsoft.com/profile/charlie.russel
>
>
> "LifeOnMars" <LifeOnMars@discussions.microsoft.com> wrote in message
> news:5C575396-D059-49F3-A141-B9D0B2B0324E@microsoft.com...
> > Hi there
> > Do 32bit apps, such as a password cracking applications run at a 64bit
> > 'mode' when installed and run in a 64bit environment?
> >
> > I have a dual core 2GH laptop and have installed Windows XP Pro 64bit on
> > it
> > to speed up the password crunching process but the application is not
> > specifically designed for a 64bit environment. Am I clutching on straws?
> >
> > Thank you
> > LifeOnMars
>
>