Annotate cholesky for use with apex/other #826
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This is a squashed commit containing multiple changes completion_modes: pika supports different completion modes that may be used as an alternative to the dlaf:: transformMPI mechanism that uses yield_while to wait on an MPI request. The completion modes may be set via the environment variable PIKA_MPI_COMPLETION_MODE=<numeric value> which by default will select the one chosen by pika/dlaf developers known to give good results across a broad range of use cases. polling: The pika polling loop may test for one or multiple request completions on each iteration through the scheduling loop the environment var PIKA_MPI_POLLING_SIZE=<numeric value> (default 8) may be used to vary the polling size (typically the default value can be used without any need to play with this value) mpi pool: pika will create the mpi pool if the completion mode has the pool flag set, the user needs only to call the pool create function during the pika::init setup phase. Cleanup of the pool on shutdown will also be handled automatically The user should use pika::mpi::pool_name instead of raw "mpi", mpi pool management has been deferred tom pika::mpi Change: the transform mpi code does not need to return an MPI_SUCCESS value, the return value from mpi_transform has been removed to simplify code and an error is set using senders set_error if any mpi call fails. Should mpi_transform calls thnat return other value be required, this code can be reinstated.
A series of changes to pika::mpi have changed both the API and the internal pool creation mechanism to simplify end user access to the transform_mpi features and setup of mpi polling itself.
latest pika:: transform_mpi is enabled/disabled via the command line and does not require explicit enabling via init_params
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