Zoltan2: fixed memory leak when using 32-bit Scotch #9313
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kddevin
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tasmith4
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Jun 18, 2021
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@trilinos/zoltan2
Motivation
In #9312 @tasmith4 reported a memory leak when using 32-bit Scotch.
When Scotch's IDs (SCOTCH_Num) differ from the offset_type in the Zoltan2 Adapter, Zoltan2 deep copies vertex and adjacency arrays into arrays of type SCOTCH_Num to be passed to Scotch. Templating helps Zoltan2 determine whether or not the copy is necessary, and then whether the deep copies need to be freed.
In this bug, the template types used in the free differed from those in the alloc, so the vertloctab array was allocated but never freed. This PR makes the template types agree.
Related Issues
Stakeholder Feedback
@tasmith4
Testing
ascicgpu machines, serial node, gcc7.2, Scotch 6.0.4 with 32-bit indices (provided by @tasmith4 from sierra build), OpenMPI 4.0.5, valgrind, np=1 and 4
Reproduced error; verified that PR eliminates the valgrind error.