1 /* Copyright (c) 2019-2022. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
12 /* Test reading and writing zero bytes (set status correctly) */
14 int main( int argc, char *argv[] )
25 MPI_Init( &argc, &argv );
27 comm = MPI_COMM_WORLD;
28 MPI_File_open( comm, (char*)"/scratch/testfile", MPI_MODE_RDWR | MPI_MODE_CREATE | MPI_MODE_DELETE_ON_CLOSE, MPI_INFO_NULL, &fh );
29 MPI_Comm_size( comm, &size );
30 MPI_Comm_rank( comm, &rank );
31 buf = (int *)malloc( size * sizeof(int) );
35 MPI_File_write_at( fh, sizeof(int)*rank, buf, 1, MPI_INT, &status );
36 MPI_Get_count( &status, MPI_INT, &count );
39 fprintf( stderr, "Wrong count (%d) on write_at\n", count );fflush(stderr);
42 /* Read nothing (check status) */
43 memset( &status, 0xff, sizeof(MPI_Status) );
44 MPI_File_read_at( fh, sizeof(int)*rank, buf, 0, MPI_INT, &status );
45 MPI_Get_count( &status, MPI_INT, &count );
48 fprintf( stderr, "Count not zero (%d) on read\n", count );fflush(stderr);
51 /* Write nothing (check status) */
52 memset( &status, 0xff, sizeof(MPI_Status) );
53 MPI_File_write_at( fh, sizeof(int)*rank, buf, 0, MPI_INT, &status );
56 fprintf( stderr, "Count not zero (%d) on write\n", count );fflush(stderr);
61 for (int i = 0; i < size; i++)
63 MPI_File_read_at( fh, sizeof(int)*rank, buf, 1, MPI_INT, &status );
64 // if (buf[0] != rank) {
66 // fprintf( stderr, "%d: buf = %d\n", rank, buf[0] );fflush(stderr);
70 MPI_File_close( &fh );