Boost C++ Libraries: Ticket #2586: all_gather generates a memory leak

attachment set

anonymous — Fri, 12 Dec 2008 15:48:37 GMT

attachment → test_all_gather.cpp

attachment set

anonymous — Fri, 12 Dec 2008 15:49:07 GMT

attachment → valgrind_out.txt

owner, severity changed

anonymous — Fri, 12 Dec 2008 16:12:05 GMT

owner changed from Douglas Gregor to Matthias Troyer
severity Problem → Cosmetic

This is a minor issue. Boost.MPI creates a global map of MPI Datatypes used that are cached until the end of execution. They cannot be released at the end of program execution when the map is destroyed, since at that time MPI is no longer initialized. Since at that point in time a memory leak is irrelevant this is an acceptable decision.

However, it causes this warning when users check their code by valgrind. Note that it will appear anytime you use a custom MPI datatype anywhere, not just when using all_reduce.

We can still fix it in the next release, at the cost of slightly slower finalization of MPI.

micdestefano@… — Mon, 15 Dec 2008 06:52:39 GMT

Ok. I didn't know if it was a serious problem or not. So, I simply reported.
If it does not prevent the normal execution of any program, for me it's OK.

Thank you very much.
Best Regards
Michele De Stefano

status changed; resolution set

Matthias Troyer — Mon, 03 Aug 2009 20:41:19 GMT

status new → closed
resolution → fixed