How to simulate different CPU frequency and limit RAM

I have to build a simulator with C#. This simulator should be able to run a second thread with configureable CPU speed and limited RAM size, e.g. 144MHz and 50 MB.

Of course I know that a simulator can never be as accurate as the re开发者_JAVA技巧al hardware. But I try to get almost similar performance.

At the moment I'm thinking about creating a thread which I will stop/sleep from time to time. Depending on the desired CPU speed the simulator should adjust the sleep time of this thread and therefore simulate different cpu frequency. To measure the achieved speed I though about using PerformanceCounters. But with this approach I have the problem that I don't know how to limit the RAM size the thread could use.

Do you have any ideas how to realize such a simulator?

Thanks in advance!!

Limit memory is easy with the virtual machines like vmware. You can change cpu speed with some overclocking tools. For example http://cpu.rightmark.org/products/rmclock.shtml Good luck!

CPU speed limiting? You should check this, perhaps it will useful (to some degree at least). CPU Emulation and locking to a specific clock speed

If you are concerned with simulating an operating system environment then one answer would be to use a virtual machines environment where you can control memory and CPU parameters, etc.

The threading pause\stop may help you to simulate CPU frequency, but this is going to be terribly inaccurate as when you pause the thread it will be de-scheduled, then it's up to the operating system to re-schedule it at some "random" point in time i.e. a point which you have no control over.

As for limiting the memory, starting a new process that will host your code is an option, and then limiting the memory of that process, e.g.:

http://www.codeproject.com/KB/threads/Setting_Max_Memory_Limit.aspx

This will not really simulate overall OS memory limitations though.

A thread to sleep down the software execution of your guest opcodes ?

I think it works but a little weird, like fast-forward, pause, ff, pause, etc...

If you just want to speed down a process, try this: use the cpu single step features, and "debug" the process. You have to wrote a custom handler for the cpu single stepping trap. Your handler job is only a big loop of NOPs.

You have a fine delay between each instruction.