Fog Creek Software
Discussion Board

tools to slow-down software

Do any of you guys know of tools for emulating slower processors? I want to test some things to see how they perform, but the slowest system I have access to is a 900, and everything performs well on my machine :) Makes it hard to see how well it works on the low end though.

Mike Swieton
Tuesday, November 6, 2001

One way is to run Vmware 2.0; it slows things down quite a bit because it's emulating the processor in software. It doesn't slow things down a predictable amount, though.

If you believe the marketing people, VMWare 3.0 is supposed to be faster. I haven't tried it yet.

Joel Spolsky
Tuesday, November 6, 2001

Yeah, VMWare 3.0 is faster than 2.0, and slicker in lots of ways -- which isn't going to help here.

The Win2K Server Resource Kit includes a utility named cpustres.exe, which lets you launch up to 4 threads and set their priority and activity levels. Run it with TaskMan open at the same time and you can adjust pretty well how much of your CPU the thing should suck down. There's another tool in the RK named LeakyApp which sucks down available memory so you can stress things that way as well.

Unfortunately as far as I can tell you have to own the RK -- these tools aren't in the online version.

Mike Gunderloy
Tuesday, November 6, 2001

Many old MS-DOS applications have problems with today's fast processors, and several software solutions have been developed to help.  The one at this link: has been recommended several times in places I lurk.  Check it out - it might work for you, too.

Karl Perry
Friday, November 9, 2001

Just ran across another one, BBSlowdown2001 at . Haven't tried it myself, so caveat emptor.

Mike Gunderloy
Monday, November 12, 2001

*  Recent Topics

*  Fog Creek Home