June 14th, 2006 Adrian Banks 12404 Views
I was working on some code that seemed to take an age to get going. Simple I thought: run it throught the Red Gate ANTS Profiler, look at the offending code and sort the problem. I wish it was as straightforward. Profiling or debugging the code seemed to make it run quickly, so I had to resort to the good old technique of logging debug output line by line.
After finding the lethargic code, the line that stalled progress for almost a minute didn't look that concerning:
A bit of Googling turned up trumps. A post by Brian Grunkemeyer from the BCL team gave the answer:
This initial snapshot must have been the cause of the delay. A quick code-edit later to avoid the use of the Process class (I was actually interested in the name of the executing file so I used Assembly.GetExecutingAssembly()) and the almost 60 second pause was gone.
So why was it running quicker when debugging/profiling? I presume that the debugger/profiler would have been using the System.Diagnostics namespace, and more specifically the Process class, as part of its internals, thus the costly first call snapshot had already happened.
Entry Filed Under: .Net