root/ompi/mca/io/romio321/romio/adio/ad_zoidfs/ad_zoidfs_flush.c

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DEFINITIONS

This source file includes following definitions.
  1. ADIOI_ZOIDFS_Flush

   1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
   2 /* 
   3  *
   4  *   Copyright (C) 1997 University of Chicago. 
   5  *   See COPYRIGHT notice in top-level directory.
   6  */
   7 
   8 #include "ad_zoidfs.h"
   9 #include "ad_zoidfs_common.h"
  10 
  11 /* we want to be a bit clever here:  at scale, if every client sends a
  12  * flush request, it will stress the file system with redundant
  13  * commit requests.  Instead, one process should wait for
  14  * everyone to catch up, do the sync, then broadcast the result.  
  15  */
  16 
  17 void ADIOI_ZOIDFS_Flush(ADIO_File fd, int *error_code) 
  18 { 
  19     int ret, rank, dummy=0, dummy_in=0; 
  20     ADIOI_ZOIDFS_object *zoidfs_obj_ptr;
  21     static char myname[] = "ADIOI_ZOIDFS_FLUSH";
  22 
  23     *error_code = MPI_SUCCESS;
  24 
  25     zoidfs_obj_ptr = (ADIOI_ZOIDFS_object*)fd->fs_ptr;
  26 
  27     MPI_Comm_rank(fd->comm, &rank);
  28 
  29     /* collective call to ensure no outstanding write requests. reduce is
  30      * slightly less expensvie than barrier */
  31     MPI_Reduce(&dummy_in, &dummy, 1, MPI_INT, MPI_SUM, 
  32             fd->hints->ranklist[0], fd->comm);
  33 
  34     if (rank == fd->hints->ranklist[0]) {
  35         ret = zoidfs_commit(zoidfs_obj_ptr, ZOIDFS_NO_OP_HINT);
  36     }
  37     MPI_Bcast(&ret, 1, MPI_INT, fd->hints->ranklist[0], fd->comm);
  38 
  39     /* --BEGIN ERROR HANDLING-- */
  40     if (ret != 0) {
  41         *error_code = MPIO_Err_create_code(MPI_SUCCESS,
  42                                            MPIR_ERR_RECOVERABLE,
  43                                            myname, __LINE__,
  44                                            ADIOI_ZOIDFS_error_convert(ret),
  45                                            "Error in zoidfs_commit", 0);
  46     }
  47     /* --END ERROR HANDLING-- */
  48 }
  49 
  50 /* 
  51  * vim: ts=8 sts=4 sw=4 noexpandtab 
  52  */

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