How Do I free up a Fortran Mexed substructure (running out of memory-leaking memory)

I have a program inwhich matlab is calling a mexed Fortran 77 subroutine. Created in the mexed fortran file is a structure within structure for output. So I create these temporary structures that creates the main output structure.. So that all works fine......... Now its a matter of RELEASING these temporary subs structures because after the program gets called a few 1000 times, I get the low-memory notice, then soon matlab crashes and burns. I had the task manager showing me that the PF usuage does not drop back down after each call.

The temporary structures being created are using: tmpstruct = mxCreateStructMatrix(x,x,x,x)

I have tried at the end of the fortran file before it returns to matlab the following: mxfree(tmpstruct) and mxDestroyArray(tmpstruct) and the memory never never gets released until I shut down matlab or the memory leak shuts down matlab.

Any ideas ????

Answer 1

[Philip Borghesani]

Unless you are calling mexMakeArrayPersistent I suspect you have another leak than that one. Matlab will eventually clean up all mxArrays (actuality any call to mxCreate... or mxMalloc) allocated by a mex file. It is best practice to do this yourself with mxDestroyArray (NOT mxFree) for performance and cleanliness reasons but not necessary especially if your code calls mexError...

I would look for any code that uses Fortran dynamic memory directly. Reduce your code to the minimum that leaks and post it here if you have not found the leak.

[Rick]

Thank you Philip............. I will do that.