--- /dev/null
+/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
+/*
+ * (C) 2014 by Argonne National Laboratory.
+ * See COPYRIGHT in top-level directory.
+ */
+#include <mpi.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <assert.h>
+
+//#define NUM_X 536870911
+#define NUM_X 536870912
+#define NUM_Y 1
+
+//#define BIGDT 2147483643
+#define BIGDT 2147483647
+
+/*
+static char MTEST_Descrip[] = "Nonblocking file read/write for bigtype";
+*/
+
+int main(int argc, char **argv)
+{
+ MPI_File fh;
+ int i, j;
+ size_t k;
+ MPI_Datatype inner_type, rem_type, mem_type;
+ MPI_Datatype int_type, file_type;
+ int *buf_write, *buf_read;
+ int rc;
+ MPI_Aint disp[2];
+ int block_len[2];
+ MPI_Datatype type[2];
+ MPI_Status status;
+ MPI_Request request;
+
+ MPI_Init(&argc, &argv);
+
+ if (sizeof(MPI_Aint) <= sizeof(int)) {
+ /* can't test on this platform... */
+ goto exit;
+ }
+
+ k = 0;
+ /* create a large buffer 2 */
+ buf_write = malloc(NUM_X * NUM_Y * sizeof(int));
+ buf_read = malloc(NUM_X * NUM_Y * sizeof(int));
+ if (buf_write == NULL || buf_read == NULL) {
+ fprintf(stderr, "Not enough memory\n");
+ exit(1);
+ }
+ memset(buf_read, 0, NUM_X * NUM_Y * sizeof(int));
+
+ for (i = 0; i < NUM_X; i++) {
+ for (j = 0; j < NUM_Y; j++) {
+ buf_write[k] = k;
+ k++;
+ }
+ }
+
+ /* Big Datatype (2^31 - 1 bytes) */
+ MPI_Type_contiguous(BIGDT, MPI_BYTE, &inner_type);
+ /* Small Datatype (1 byte) */
+ MPI_Type_contiguous(1, MPI_BYTE, &rem_type);
+
+ type[0] = inner_type;
+ type[1] = rem_type;
+ block_len[0] = 1;
+ block_len[1] = 1;
+ disp[0] = 0;
+ disp[1] = BIGDT;
+
+ /* combine both types */
+ MPI_Type_struct(2, block_len, disp, type, &mem_type);
+
+ MPI_Type_commit(&mem_type);
+ MPI_Type_free(&rem_type);
+ MPI_Type_free(&inner_type);
+
+ MPI_Type_contiguous(4, MPI_BYTE, &int_type);
+ {
+ /* This creates a big type that is actually contituous, touching an
+ * optimization that was at one point buggy */
+ MPI_Type_vector(1, NUM_X, 1, int_type, &file_type);
+ }
+
+ MPI_Type_commit(&file_type);
+ MPI_Type_free(&int_type);
+
+ rc = MPI_File_open(MPI_COMM_WORLD, "testfile",
+ MPI_MODE_RDWR | MPI_MODE_CREATE, MPI_INFO_NULL, &fh);
+ if (rc != MPI_SUCCESS) {
+ fprintf(stderr, "Can't open file: %s\n", "testfile");
+ exit(1);
+ }
+
+ rc = MPI_File_set_view(fh, 2144, MPI_BYTE, file_type, "native", MPI_INFO_NULL);
+ if (rc != MPI_SUCCESS) {
+ fprintf(stderr, "ERROR SET VIEW\n");
+ exit(1);
+ }
+
+ /* write everything */
+ rc = MPI_File_iwrite_at_all(fh, 0, buf_write, 1, mem_type, &request);
+ if (rc != MPI_SUCCESS) {
+ fprintf(stderr, "%d ERROR IWRITE AT ALL\n", rc);
+ exit(1);
+ }
+ MPI_Wait(&request, &status);
+
+ rc = MPI_File_set_view(fh, 2144, MPI_BYTE, file_type, "native", MPI_INFO_NULL);
+ if (rc != MPI_SUCCESS) {
+ fprintf(stderr, "ERROR SET VIEW\n");
+ exit(1);
+ }
+
+ /* read everything */
+ rc = MPI_File_iread_at_all(fh, 0, buf_read, 1, mem_type, &request);
+ if (rc != MPI_SUCCESS) {
+ fprintf(stderr, "%d ERROR IREAD AT ALL\n", rc);
+ exit(1);
+ }
+ MPI_Wait(&request, &status);
+
+ for (k = 0; k < NUM_X * NUM_Y; k++) {
+ if (buf_read[k] != buf_write[k]) {
+ fprintf(stderr, "Verfiy Failed index %zu: expected %d found %d\n",
+ k, buf_write[k], buf_read[k]);
+ assert(0);
+ }
+ }
+
+ free(buf_write);
+ free(buf_read);
+ MPI_File_close(&fh);
+
+ MPI_Type_free(&mem_type);
+ MPI_Type_free(&file_type);
+
+ exit:
+ MPI_Finalize();
+ printf(" No Errors\n");
+
+ return 0;
+}