PetscPostIrecvScalar

Allocate the receive buffers for an irregular all-to-all of PetscScalar messages and post non-blocking MPI_Irecv()s on them

Synopsis

#include "petscsys.h"  
PetscErrorCode PetscPostIrecvScalar(MPI_Comm comm, PetscMPIInt tag, PetscMPIInt nrecvs, const PetscMPIInt onodes[], const PetscMPIInt olengths[], PetscScalar ***rbuf, MPI_Request **r_waits)

Collective; No Fortran Support

Input Parameters

• comm - the MPI_Comm to communicate over

• tag - MPI tag for the irecvs

• nrecvs - number of receives to post

• onodes - array of length nrecvs of source ranks

• olengths - array of length nrecvs of message lengths (in PetscScalars)

Output Parameters

• rbuf - allocated array of length nrecvs of pointers to the receive buffers (in contiguous storage)

• r_waits - allocated array of length nrecvs of MPI_Requests for the posted irecvs

Note

The caller is responsible for freeing rbuf[0], rbuf, and r_waits with PetscFree() once the irecvs have completed.

See Also

PetscPostIrecvInt(), PetscGatherNumberOfMessages(), PetscGatherMessageLengths()

Level

developer

Location

src/sys/utils/mpimesg.c

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