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GETRF NOPIV: Use explicit workspaces to control the communication flow

Matthieu Kuhn requested to merge satanas-atos/chameleon:workspace_mpi_getrf into master

  • Add an option to switch from optimized lacpy to non optimized and switch back to non optimized lacpy in gepdf_qdwh (this is to fix the master)

  • Add workspace parameter to the getrf nopiv algorithm to provide temporary matrices in which the communications are stored to prevent buffer allocation overhead This algorithm reintroduces the notion of lookahead (see control/compute_z.h and compute/pzgetrf_nopiv.c).

Edited by Mathieu Faverge

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