697dc524c1
for the F90 type create functions to the requirements of MPI 2.1 standard. Advice to implementors. An application may often repeat a call to MPI_TYPE_CREATE_F90_xxxx with the same combination of (xxxx,p,r). The application is not allowed to free the returned predefined, unnamed datatype handles. To prevent the creation of a potentially huge amount of handles, the MPI implementation should return the same datatype handle for the same (REAL/COMPLEX/INTEGER,p,r) combination. Checking for the combination (p,r) in the preceding call to MPI_TYPE_CREATE_F90_xxxx and using a hash-table to find formerly generated handles should limit the overhead of finding a previously generated datatype with same combination of (xxxx,p,r). (End of advice to implementors.) This commit fixes trac:1239, and #712. This commit was SVN r19458. The following Trac tickets were found above: Ticket 1239 --> https://svn.open-mpi.org/trac/ompi/ticket/1239
/* * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana * University Research and Technology * Corporation. All rights reserved. * Copyright (c) 2004-2005 The University of Tennessee and The University * of Tennessee Research Foundation. All rights * reserved. * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart, * University of Stuttgart. All rights reserved. * Copyright (c) 2004-2005 The Regents of the University of California. * All rights reserved. * $COPYRIGHT$ * * Additional copyrights may follow * * $HEADER$ */ /** @page page_mpi The src/mpi directory @section page_mpi_introduction Introduction This is the introduction. This is the introduction. This is the introduction. This is the introduction. This is the introduction. This is the introduction. This is the introduction. */