Diagnosing High CPU in Visual Studio

Diagnosing High CPU in Visual Studio


Ever had a high CPU?



In Visual Studio (VS), turn on symbols - Tools > Options > Debugging > Symbols, if you have some of the "hot path" being in external library calls:

In Visual Studio, turn on "Release Mode".  I have had programs that show 9% CPU on local in Debug mode, while showing 50% when in Release mode.:



Debug > Performance Profiler > click the "CPU Usage" > "Start" button:


After starts and you press "Stop", then VS analyzes the results:


Then after further exploration, expand or show hot path:


To diagnosis the potential problem when you made new version of program:
   1) Compare numbers of the old and new versions of the program on the same box.
 
To diagnosis the potential problem when a particular box has high CPU and the other does not:
   1) Remember to compare the processors and their RAM using web sites such as https://www.cpu-monkey.com/ .  
   2) Look at Network and Disk use by the program.  (You will need to probably use the Resource Monitor if the problem system is a server). 

Potential fixes for high CPU are:
   1) Caching things that rarely change such as closed stores.  (See Caching blog entry elsewhere in this blog).

To reduce high CPU, remember that: 
  1) Parallel programming is great for CPU-bound tasks by leveraging multiple cores
  2) Asynchronous programming shines in I/O-bound operations, optimizing resource utilization. 
  So do more Parallel programming.














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