C# Memory Leak

Hello,

we noticed a memory leak in our c# application using Ice. While we were looking deeper into the problem we experimented with a minimal application and different Ice versions (3.4, 3.5 and 3.6). Depending on the ice version we noticed different behavior. And strangely ONLY with 3.4 there is no memory leak.

This is the slice file of the minimal application:

module MemoryLeaker {

    sequence<byte> byteVec;

    struct leakyObject {
      int id;
      byteVec leakBytes;
    };

    interface Leaker {
        void leakMemory(int amount, leakyObject inObj, out leakyObject outObj);
    };
};

The server does the following: Everytime the method "leakMemory" is called 50 MB are allocated for the leakyObject and the object is returned.

The client contains a loop that creates a new ice connection and proxy and calls the "leakMemory" method on each iteration. Afterwards "destroy" on the communicator is called.
Calling ice initialize every iteration seems to cause the memory leak. We know that the memory leak does not occur if we would call initalize only once. However we can't do this in our production application.

With 3.4 there's no memory usage increase. With 3.5 client AND server's memory usage increases. With 3.6 only the server's memory usage increases.

Our current workaround is to stick with ice3.4. However we need to upgrade soon due to our changing development environment. E.g. there's no ice3.4 visual studio addin for VS2012 available.


You can find the sources of the test applications in the attachment.

Do you have any idea why the behavior changed between the different ice versions?


Best regards and thanks in advance,
Johanna