PetscGatherNumberOfMessages

 Computes the number of messages a node expects to receive

Synopsis

#include "petsc.h"  
int PetscGatherNumberOfMessages(MPI_Comm comm,int *iflags,int *ilengths,int *nrecvs)
Collective on MPI_Comm

Input Parameters

comm - Communicator
iflags - an array of integers of length sizeof(comm). A '1' in ilengths[i] represent a message from current node to ith node. Optionally PETSC_NULL
ilengths - Non zero ilengths[i] represent a message to i of length ilengths[i]. Optionally PETSC_NULL.

Output Parameters

nrecvs -number of messages received

Notes

With this info, the correct message lengths can be determined using PetscGatherMessageLengths()

Either iflags or ilengths should be provided. If iflags is not provided (PETSC_NULL) it can be computed from ilengths. If iflags is provided, ilengths is not required.

See Also

PetscGatherMessageLengths()

Level:developer
Location:src/sys/src/utils/mpimesg.c
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages