Guest LifeOnMars Posted August 17, 2007 Posted August 17, 2007 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
Guest Charlie Russel - MVP Posted August 17, 2007 Posted August 17, 2007 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
Guest Shehbaz Afzal Posted August 17, 2007 Posted August 17, 2007 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 > >
Guest Shehbaz Afzal Posted August 17, 2007 Posted August 17, 2007 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 > >
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