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Barry
Joined: 28 Jan 2011
Posts: 2
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 Posted: Fri Jan 28, 2011 6:27 pm Post subject: Wallclock Time Question |
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I am testing two versions of our application, one built with .Net 1.1 and the other on .Net 3.5.
The testing is isolated on a development workstation and all external devices; [SQL Server, etc.] are the same.
When comparing wall-clock time for the top level process in a given call stack I am do not understand the results I am seeing.
Application A shows a time of 250.764 and application B shows 229.300.
In this scenario I would expect that application B would complete the task quicker than application A.
When run outside the profiler application A completes the task in 70% of the time taken by application B.
Any help in explaining what I am misunderstanding appreciated. |
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Chris.Allen
Joined: 12 Mar 2009
Posts: 443
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| Posted: Mon Jan 31, 2011 6:46 pm Post subject: |
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| You can only do accurate *absolute* timings when the profiler is in low-overhead mode. This discounts using line-level profiling. Can you repeat the experiment with sampling mode? Also, wall-clock times are going to be heavily influenced by external latencies. Try CPU timing first - again if its comparing *absolute* time you are interested in. |
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Barry
Joined: 28 Jan 2011
Posts: 2
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| Posted: Mon Jan 31, 2011 9:48 pm Post subject: Re: |
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| Chris.Allen wrote: |
| You can only do accurate *absolute* timings when the profiler is in low-overhead mode. This discounts using line-level profiling. Can you repeat the experiment with sampling mode? Also, wall-clock times are going to be heavily influenced by external latencies. Try CPU timing first - again if its comparing *absolute* time you are interested in. |
Thank you for the information: I'll try it with those settings and get back to you if I am still confused. |
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