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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>
#include "mpitest.h"
static MPI_Datatype make_largexfer_type_struct(MPI_Offset nbytes)
{
int typechunk_size = 1024 * 1024; /* in bytes: TODO: figure out how big a
* chunk is really needed */
int chunk_count;
int remainder = 0;
MPI_Datatype memtype, chunktype;
/* need to cook up a new datatype to accommodate large datatypes */
/* first pass: chunks of 1 MiB plus an additional remainder. Does require
* 8 byte MPI_Aint, which should have been checked for earlier */
chunk_count = nbytes / typechunk_size;
remainder = nbytes % typechunk_size;
MPI_Type_contiguous(typechunk_size, MPI_BYTE, &chunktype);
MPI_Type_commit(&chunktype);
/* a zero remainder means we can just count contigs */
if (remainder == 0) {
MPI_Type_contiguous(chunk_count, chunktype, &memtype);
MPI_Type_free(&chunktype);
} else {
if (sizeof(MPI_Aint) <= sizeof(int)) {
return MPI_DATATYPE_NULL;
}
/* struct type: some number of chunks plus remaining bytes tacked
* on at end */
int lens[] = { chunk_count, remainder };
MPI_Aint disp[] = { 0, (MPI_Aint) typechunk_size * (MPI_Aint) chunk_count };
MPI_Datatype types[] = { chunktype, MPI_BYTE };
MPI_Type_create_struct(2, lens, disp, types, &memtype);
MPI_Type_free(&chunktype);
}
MPI_Type_commit(&memtype);
return memtype;
}
static MPI_Datatype make_largexfer_type_hindexed(MPI_Offset nbytes)
{
int i, count;
int chunk_size = 1024 * 1024;
int *blocklens;
MPI_Aint *disp;
MPI_Datatype memtype;
/* need to cook up a new datatype to accommodate large datatypes */
/* Does require 8 byte MPI_Aint, which should have been checked for earlier
*/
if (sizeof(MPI_Aint) <= sizeof(int)) {
return MPI_DATATYPE_NULL;
}
/* ceiling division */
count = 1 + ((nbytes - 1) / chunk_size);
blocklens = calloc(count, sizeof(int));
disp = calloc(count, sizeof(MPI_Aint));
for (i = 0; i < (count - 1); i++) {
blocklens[i] = chunk_size;
disp[i] = (MPI_Aint) chunk_size *i;
}
blocklens[count - 1] = nbytes - ((MPI_Aint) chunk_size * i);
disp[count - 1] = (MPI_Aint) chunk_size *(count - 1);
MPI_Type_create_hindexed(count, blocklens, disp, MPI_BYTE, &memtype);
MPI_Type_commit(&memtype);
free(blocklens);
free(disp);
return memtype;
}
static int testtype(MPI_Datatype type, MPI_Offset expected)
{
MPI_Count size, lb, extent;
int errs = 0;
MPI_Type_size_x(type, &size);
if (size < 0) {
printf("ERROR: type size apparently overflowed integer\n");
errs++;
}
if (size != expected) {
printf("reported type size %lld does not match expected %lld\n", (long long) size,
(long long) expected);
errs++;
}
MPI_Type_get_true_extent_x(type, &lb, &extent);
if (lb != 0) {
printf("ERROR: type should have lb of 0, reported %lld\n", (long long) lb);
errs++;
}
if (extent != size) {
printf("ERROR: extent should match size, not %lld\n", (long long) extent);
errs++;
}
return errs;
}
int main(int argc, char **argv)
{
int errs = 0, i;
int rank, size;
MTest_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
#define NR_TYPES 3
MPI_Offset expected_sizes[NR_TYPES] = { 1024UL * 1024UL * 2400UL,
2346319872,
2346319872
};
MPI_Datatype types[NR_TYPES];
/* a contig type, itself large, but does not need 8 byte aints */
types[0] = make_largexfer_type_struct(expected_sizes[0]);
/* struct with addresses out past 2 GiB */
types[1] = make_largexfer_type_struct(expected_sizes[1]);
/* similar, but with hindexed type */
types[2] = make_largexfer_type_hindexed(expected_sizes[2]);
for (i = 0; i < NR_TYPES; i++) {
if (types[i] != MPI_DATATYPE_NULL) {
errs += testtype(types[i], expected_sizes[i]);
MPI_Type_free(&(types[i]));
}
}
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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