How long does a GC take?

Question

We have a theory that gen 2 GCs could be introducing delays into an application, is there a way to profile how long GCs take?

Also see http://stackoverflow.com/questions/4288898/how-to-profile-net-garbage-collector. — John Pick, Feb 23 '11 at 21:36

score 5 · Answer 1 · answered Feb 23 '11 at 21:22

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There are performance counters for the total time spent in GC and various info about number of collections, heap sizes and so on. See this article for detailed instructions.

If you just want a quick look at an application, use the process explorer. It can show most of the .NET statistics for a process.

answered Feb 23 '11 at 21:22

TToni

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I'm looking specifically for how long a single full GC takes. Is it suspending everything for 10 ms... 100 ms... 500 ms. – rjdevereux Feb 24 '11 at 18:04

score 3 · Answer 2 · edited May 23 '17 at 12:14

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The .NET 4.0 has ETW for GC which can help in profiling the time spent on GC.

Here is an answer similar to your question Can you repro this 64-bit .NET 4 GC bug?

edited May 23 '17 at 12:14

Community

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answered Feb 24 '11 at 14:11

Naveen

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score 0 · Answer 3 · answered May 23 '14 at 17:53

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Perfview tracks all sorts of useful information about GC:

Downlaod: http://www.microsoft.com/en-us/download/details.aspx?id=28567

Blog post + Video: http://blogs.msdn.com/b/dotnet/archive/2012/10/09/improving-your-app-s-performance-with-perfview.aspx

answered May 23 '14 at 17:53

rjdevereux

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How long does a GC take?

3 Answers3