CODEWITHSUNDEEP
c#sql-serverwcfmemory-leaksmsmq
Brandon
Brandon

Reputation: 291

How to research unmanaged memory leaks in .NET?

I have a WCF service running over MSMQ. Memory gradually increases over time, indicating that there is some sort of memory leak. I ran the service locally and monitored some counters using PerfMon. Total CLR memory managed heap bytes remains relatively constant, while the process' private bytes increases over time. This leads me to believe that there is some sort of unmanaged memory leak. Assuming that unmanaged memory leak is the issue, how do I address the issue? Are there any tools I could use to give me hints as to what is causing the unmanaged memory leak? Also, all my service is doing is reading from the transactional queue and writing to a database, all as part of a DTC transaction (handled under the hood by requiring a transaction on the service contract). I am not doing anything explicitly with COM or DllImports.

Thanks in advance!

Upvotes: 29

Views: 22378

Answers (4)

Rajesh Dagar
Rajesh Dagar

Reputation: 11

Make sure that you close the service client after using it. something like 

try {
... do work ...
Close();
} ... exception handling ... {
Abort();
}

Upvotes: 1

Carlos Mendible
Carlos Mendible

Reputation: 331

This blog will help you if you are willing to learn about windbg (http://www.microsoft.com/whdc/devtools/debugging/default.mspx).

http://blogs.msdn.com/tess/default.aspx

Upvotes: 4

Remus Rusanu
Remus Rusanu

Reputation: 294207

You can use Windbg to analyze the process Heap. There are some articles and cheat sheets showing how to do this, like Memory Leak Detection Using Windbg

Upvotes: 5

JohnC
JohnC

Reputation: 607

Ants Profiler is worth considering. As far as I can remember, you can download a trial version.

Upvotes: 0

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