+/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
+/*
+ * (C) 2014 by Argonne National Laboratory.
+ * See COPYRIGHT in top-level directory.
+ */
+
+/* Look for regressions in aggregator code. A more simple access pattern than
+ * aggregation1 */
+
+/* Uses nonblocking collective I/O.*/
+
+#include <mpi.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <string.h>
+
+#define BUFSIZE 512
+
+static void handle_error(int errcode, const char *str)
+{
+ char msg[MPI_MAX_ERROR_STRING];
+ int resultlen;
+ MPI_Error_string(errcode, msg, &resultlen);
+ fprintf(stderr, "%s: %s\n", str, msg);
+ MPI_Abort(MPI_COMM_WORLD, 1);
+}
+
+int main(int argc, char **argv)
+{
+ MPI_Info info = MPI_INFO_NULL;
+ MPI_File fh;
+ MPI_Offset off = 0;
+ MPI_Status status;
+ int errcode;
+ int i, rank, errs = 0, toterrs, buffer[BUFSIZE], buf2[BUFSIZE];
+ MPI_Request request;
+ const char *filename = NULL;
+
+ filename = (argc > 1) ? argv[1] : "testfile";
+
+ MPI_Init(&argc, &argv);
+
+ MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+
+ MPI_Info_create(&info);
+ MPI_Info_set(info, "romio_cb_write", "enable");
+ MPI_Info_set(info, "cb_nodes", "1");
+
+ for (i = 0; i < BUFSIZE; i++) {
+ buffer[i] = 10000 + rank;
+ }
+ off = rank * sizeof(buffer);
+
+ errcode = MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_WRONLY | MPI_MODE_CREATE, info, &fh);
+ if (errcode != MPI_SUCCESS)
+ handle_error(errcode, "MPI_File_open");
+ errcode = MPI_File_iwrite_at_all(fh, off, buffer, BUFSIZE, MPI_INT, &request);
+ if (errcode != MPI_SUCCESS)
+ handle_error(errcode, "MPI_File_iwrite_at_all");
+ MPI_Wait(&request, &status);
+ errcode = MPI_File_close(&fh);
+ if (errcode != MPI_SUCCESS)
+ handle_error(errcode, "MPI_File_close");
+
+ errcode = MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_RDONLY, info, &fh);
+ if (errcode != MPI_SUCCESS)
+ handle_error(errcode, "MPI_File_open");
+ errcode = MPI_File_iread_at_all(fh, off, buf2, BUFSIZE, MPI_INT, &request);
+ if (errcode != MPI_SUCCESS)
+ handle_error(errcode, "MPI_File_iread_at_all");
+ MPI_Wait(&request, &status);
+ errcode = MPI_File_close(&fh);
+ if (errcode != MPI_SUCCESS)
+ handle_error(errcode, "MPI_File_close");
+
+ for (i = 0; i < BUFSIZE; i++) {
+ if (buf2[i] != 10000 + rank)
+ errs++;
+ }
+ MPI_Allreduce(&errs, &toterrs, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
+ if (rank == 0) {
+ if (toterrs > 0) {
+ fprintf(stderr, "Found %d errors\n", toterrs);
+ }
+ else {
+ fprintf(stdout, " No Errors\n");
+ }
+ }
+ MPI_Info_free(&info);
+ MPI_Finalize();
+
+ return 0;
+}