Why _List has so many instances?

[Kun Zhao]

I have graph designer like web application. When it loads a big project, the memory usage can go up to 2GB. I am trying to find out if I have memory leak. The first thing I did is open the App, w/o loading any project and observe the Allocation Profile.

My app shows memory usage of 128MB in task manager:

Here is the Allocation Profile:

Notice that without loading anything, there are already so many _List. Then I clicked on the _List to show the details as following:

Appending _List(100), it looks like this list recursively references to the whole list:

When a big project is loaded, the _List new generation accumulate size can go up to 1.5G. It is very suspicious to me.

 

Why _List(100) reference recursively? How can I find out if there is a memory leak?

Thanks.

[Kun Zhao]

An update, click GC button can get rid of a lot of _list instances:

There is the number when the web page just loaded (w/o loading any project):

This is after forced a GC:

Here are the numbers: 1. after loading a big project  2. forced GC

[John Mccutchan]

Lists are allocated internally by the VM for many things. For example, every time you request an allocation profile ~4 lists are allocated.

John

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[Kun Zhao]

johnmccutchan,

Thanks for your response. Could you give some general suggestion about how to find potential memory leak?

Thanks,

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[John Mccutchan]

+Ryan Macnak 

Ryan can help you with diagnosing memory leaks in Observatory.

Thanks,

John

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