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My C# Application causing high CPU. How to debug?

I have a C# application which I have made. It does 100+ different tasks and recently I made some changes in my code that has started to cause random high CPU usage.

Unfortunately I have lost track of the last set of changes I had made and trying to troubleshoot it by disabling 1 function at a time would be very time consuming.

My program also runs about 40 different threads so using the debugger to chase the code 1 step at a time isn't very helpful either.

I know my program doesn't generally use so much CPU. So I have some logic error somewhere but very hard to find!

Any tips on how I can troubleshoot this better? Pehaps theres a better way to make use of the debugger tool?
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ultramoo
Asked:
ultramoo
1 Solution
 
sergiobg57Commented:
Use a profiler.
It will tell how many times methods were called and how long it took them to complete.

I just know one which is free of charge:
http://www.eqatec.com/Profiler/

Open in new window

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Sudhakar PulivarthiProject Lead - EngineeringCommented:
Hi,

You can get some more free profilers.
http://csharp-source.net/open-source/profilers

Download a free trial of these performance testing tool for solving ur issue.
http://www.red-gate.com/products/dotnet-development/ants-performance-profiler/
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ultramooAuthor Commented:
Thanks didn't know such programs existed.

The profiler says how long it took but doesn't say how much CPU cycles it took - Some of my methods have Thread.Sleep commands so the length doesn't really help.

Still I was able to figure out a lot from this. If you know of any profiler that can show CPU cycles used that would be great!

I'll keep searching around.
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Russell_VenableCommented:
Why don't you use process explorer or process monitor from systeminternals.com it's free and it allows you to learn how your program works and show's CPU usage as well as threading operations among other hard to track down problems.
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