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Editorial Team
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Asked: 2026-05-14T02:14:42+00:00

I know there is no simple answer to my question but I would appreciate

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I know there is no simple answer to my question but I would appreciate ideas, guides or
some sort of things-to-look-at list

I have a net Windows service that is constantly throwing OutOfMemoryException.
The service has two builds for x86 and x64 Windows. However on x64 it consumes a lot more
memory. I have tried profiling it with various memory profilers. But I cannot get a clue what the problem is. The diagnosis – service consumes lot of VMSize and crashes app after 3 to 12 hours. The behaviuor is rather stochastic – there is no observable pattern for crash scenario.

Also I tried to look at performance counters (perfmon.exe). What I can see is that
heap size is growing and %GC time is on average 19%. Plus memory allocation is correlated with %CPU time.

My application has threads and locking objects, DB connections and WCF interface.
The general question that I am trying to solve:

Is it simply GC not been fast enough
to GC objects or some non-managed
(windows) objects are consuming
memory?

See first app in list
http://s45.radikal.ru/i109/1003/af/92a389d189e8.jpg http://s45.radikal.ru/i109/1003/af/92a389d189e8.jpg

The link to picture with performance counters view
http://s006.radikal.ru/i215/1003/0b/ddb3d6c80809.jpg

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1 Answer

  1. Editorial Team

    Is your issue that you don’t know what is consuming a lot of memory? You can open up task manager when the process is using a lot of memory, right click your process and create a dump file which you can examine in windbg to find out exactly what’s allocating memory.

    Tess Ferrandez has a lot of excellent demos. She goes through the most useful stuff here…

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