Bug 7607 - MonoDevelop using a lot of CPU
Summary: MonoDevelop using a lot of CPU
Alias: None
Product: Xamarin Studio
Classification: Desktop
Component: General ()
Version: 3.0.x
Hardware: PC Mac OS
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2012-10-02 23:53 UTC by Maurício Linhares
Modified: 2012-10-03 15:23 UTC (History)
1 user (show)

Is this bug a regression?: ---
Last known good build:

Dumps containing information about the running app. (23.35 KB, application/zip)
2012-10-02 23:54 UTC, Maurício Linhares

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Description Maurício Linhares 2012-10-02 23:53:51 UTC
MonoDevelop constantly using 100% CPU on my project whenever I type anything.

I can't easily reproduce this issue, unless I'm at the project I'm working on, but it now happens all the time. I have already disabled aggressive code completition.

Adding a couple of thread dumps of the app running at 100%.
Comment 1 Maurício Linhares 2012-10-02 23:54:20 UTC
Created attachment 2674 [details]
Dumps containing information about the running app.
Comment 2 Maurício Linhares 2012-10-03 00:12:20 UTC
And I reverted back to and the issue doesn't happen. Seems like it's something new at 3.0.4.
Comment 3 Mikayla Hutchinson [MSFT] 2012-10-03 15:23:50 UTC
It looks like you have source analysis enabled. Source analysis has severe performance problems unless you use the sgen garbage collector. Sgen isn't used by default in Mono 2.10.x, but will be on by default in a future version of Mono. We've added a check to the next version of MD that will warn you if you enable source analysis without sgen.

For now you can run MD with sgen by running the following command from a terminal:
mono --gc=sgen /Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/bin/MonoDevelop.exe

Beware that it may occasionally crash on startup, or anything else that destroys appdomains (T4, NUnit).

Alternatively you can disable source analysis in Preferences->Other->Source Analysis.