确定堆上对象的对象分配发生的位置

Question

Is there any tool such that it can get a heap dump from a running application and determine/group objects by where in source code they were created?

With no changes to source code and ideally something free.

Answer 1

What about .NET Memory Profiler from ANTS for example. Maybe CLR Profiler.

Answer 2

The information is not available if you create a memory dump. In order to gather this, you have to monitor the process as it is running. You could launch the application via WinDbg and set breakpoints on all the constructors you're interested in (hopefully you don't want to look at each and every object).

If you create the breakpoint, so it dumps the stack you will have the point of creation for the object. However, keep in mind that the objects may move around during GC, which will make parring objects with stacks difficult (or even impossible in some cases).

Since your question is tagged with performance and profiling, I gather that you want to reduce memory allocations. Why not just look at the numbers of objects created (or possibly look at the largest objects created) by looking at the heap. Then go through the source code and figure out where such instances are created.

Answer 3

As others suggested memory profilers, Memprofiler is definitely the most advanced one (I've tried all existing .NET profilers). It has a 14 day trial.

Answer 4

You need a .NET memory profiler. These tools allow you to follow the object graphs on the garbage collected heap and can be very useful in identifying the sources of memory leaks. While they may not necessarily tell you the method where an object was created they will tell which instances of which classes are holding on to the objects and allow you to take differences of snap shots of the gc heap. They don't require modifications to source code. You may want to have a look at What Are Some Good .NET Profilers?

Answer 5

Our QA teams use http://www.jetbrains.com/profiler/ for this kind of thing here when we run into bottlenecks. I'm pretty sure it will give you a list of allocations by method call. I'll go install it and check :)

Answer 6

Good old windbg + sos + pdb will make the dumping. As for the "where in source code they were created" part - is impossible without instrumentation or injection.

Answer 7

The SOS Debugging Extension

How to use : http://msdn.microsoft.com/en-us/library/yy6d2sxs.aspx