[Dune] [#1047] memory leaks in AMG (Attachment added)

[Dune]

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User who did this - Ansgar Burchardt (ansgar) 

Attached to Project - Dune
Summary - memory leaks in AMG
Task Type - Bug Report
Category - ISTL
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN (pre2.2)
Due in Version - Undecided
Due Date - Undecided
Details - There seem to be memory leaks in ISTL's AMG solver in dune/istl/paamg/hierarchy.hh (SVN rev. 1538).  I managed to find these with valgrind so far, but I am not sure where they are supposed to be freed:

* line 728: mlevel.addRedistributed(ConstructionTraits<MatrixOperator>::construct(args));
4 timesteps: 1,286 kB in 6 blocks lost
8 timesteps: 3,086 kB in 10 blocks lost

* line 611: redistributeMatrix(const_cast<M&>(origMatrix), newMatrix, origComm, *newComm, ri);
  calls matrixredistribute.hh:828, matrixredistribute.hh:728, matrixredistribute.hh:300,
  bcrsmatrix.hh:567, bcrsmatrix.hh:1472
4 timesteps: 770 kB in 3 blocks lost
8 timesteps: 256 kB in 1 block lost
I'm not sure what to think about it leaking less memory when I do more timesteps.

* line 1114: hierarchy.addRedistributedOnCoarsest(new BlockVector<V,TA>(matrix.getRedistributed().getmat().N()));
4 timesteps: 3x 120 kB in 3 blocks lost
8 timesteps: 3x 200 kB in 3 blocks lost
Three times as the method is called for three vectors in amg.hh lines 388-390.

I observed all of these in the rank=0-process of my total 3 MPI processes.

I have attached the relevant part of the valgrind --leak-check=full output for both 4 and 8 steps.

Ansgar


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