DotMemory hangs when profiling app with ~30GB memory usage

Carstensk

Created May 17, 2017 04:53

I have a server application that uses ~30GB of memory. I can attach dotMemory to it but when pressing "Get Snapshot" I see the progress bar hanging (no activity for >20 minutes) in the "Saving snapshot" stage. I tried profiling the app during startup where memory usage was lower (~2GB) and this completed successfully. I reproduced this 3 times - the first two using remote profiling the last running locally.

I am running dotMemory 2017.1.1.

I can provide additional details if needed.

1 comment

Anna Guseva

Created May 17, 2017 10:09

First, could you please update dotMemory version to 2017.1.2?

How many objects do you have in your snapshot which was taken successfully?

dotMemory can profile applications with ~20-30 million objects, and memory usage of profiled app is limited only by your system and hardware specifications. Probably your system resources is not enough for large snapshot. Please check RAM and disk space during snapshot saving.

Also please collect dotMemory logs:

Close standalone dotMemory and Visual Studio with integrated dotMemory
Clear %temp%\JetLogs folder
Put LogConfiguration.xml file (https://dotnettools-support.jetbrains.com/hc/en-us/article_attachments/203512429/LogConfiguration.xml) to the %localappdata%\JetBrains\dotMemory\v[N] folder
Go to dotMemory installation folder: %localappdata%\JetBrains\Installations\dotMemory[N]
Using Windows command-line start dotMemory with arguments: /LogLevel=Trace
Start creating a profiling session (e.g., on dotMemory Home page, choose Local)
In the Profile Application window, press Ctrl+Shift+Alt+F11
In the Expert options dialog window, select the Enable logs checkbox (only this checkbox)
Click Save
Run the profiling session
Get snapshot, wait ~10 minutes
Stop profiling session and close dotMemory
Look for logs in the %temp%\JetLogs folder. Please zip all log files and send them to us

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