[petsc-users] Limiting the number of vectors allocated at a time by fgmres etc.

[Wells, David]

Hello,

I've been profiling the memory usage of my solver and it looks like a huge number (roughly half) of allocations are from KSPFGMRESGetNewVectors(). I read through the source code and it looks like these vectors are allocated ten at a time (FGMRES_DELTA_DIRECTIONS) in a couple of places inside that KSP. Is there a way to change this value? If not - how hard would it be to add an API to set a different initial value for that? These vectors take up a lot of memory and I would rather just one at a time.

Best,
David Wells
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