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mpi.c
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/* -----------------------------------------------------------------------
LAMMPS 2003 (July 31) - Molecular Dynamics Simulator
Sandia National Laboratories, www.cs.sandia.gov/~sjplimp/lammps.html
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------ */
/* Single-processor "stub" versions of MPI routines */
/* -I. in Makefile insures dummy mpi.h in this dir is included */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <sys/time.h>
#include <mpi.h>
/* data structure for double/int */
struct _mpi_double_int {
double value;
int proc;
};
typedef struct _mpi_double_int double_int;
/* extra MPI_Datatypes registered by MPI_Type_contiguous */
#define MAXEXTRA_DATATYPE 16
int nextra_datatype;
MPI_Datatype *ptr_datatype[MAXEXTRA_DATATYPE];
int index_datatype[MAXEXTRA_DATATYPE];
int size_datatype[MAXEXTRA_DATATYPE];
static int _mpi_is_initialized=0;
/* ---------------------------------------------------------------------- */
/* MPI Functions */
/* ---------------------------------------------------------------------- */
int MPI_Init(int *argc, char ***argv)
{
if (_mpi_is_initialized > 0) {
printf("MPI Stub WARNING: MPI already initialized\n");
return 1;
}
if (_mpi_is_initialized < 0) {
printf("MPI Stub WARNING: MPI already finalized\n");
return 1;
}
_mpi_is_initialized = 1;
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Initialized(int *flag)
{
*flag = (_mpi_is_initialized > 0) ? 1 : 0;
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Finalized(int *flag)
{
*flag = (_mpi_is_initialized < 0) ? 1 : 0;
return 0;
}
/* ---------------------------------------------------------------------- */
/* return "localhost" as name of the processor */
int MPI_Get_processor_name(char *name, int *resultlen)
{
const char host[] = "localhost";
int len;
if (!name || !resultlen) return MPI_ERR_ARG;
len = strlen(host);
memcpy(name,host,len+1);
*resultlen = len;
return MPI_SUCCESS;
}
/* ---------------------------------------------------------------------- */
/* return MPI version level. v1.2 is not 100% correct, but close enough */
int MPI_Get_version(int *major, int *minor)
{
if (!major || !minor) return MPI_ERR_ARG;
*major = 1;
*minor = 2;
return MPI_SUCCESS;
}
/* ---------------------------------------------------------------------- */
int MPI_Comm_rank(MPI_Comm comm, int *me)
{
*me = 0;
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Comm_size(MPI_Comm comm, int *nprocs)
{
*nprocs = 1;
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Abort(MPI_Comm comm, int errorcode)
{
exit(1);
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Finalize()
{
if (_mpi_is_initialized == 0) {
printf("MPI Stub WARNING: MPI not yet initialized\n");
return 1;
}
if (_mpi_is_initialized < 0) {
printf("MPI Stub WARNING: MPI already finalized\n");
return 1;
}
_mpi_is_initialized = -1;
return 0;
}
/* ---------------------------------------------------------------------- */
double MPI_Wtime()
{
double time;
struct timeval tv;
gettimeofday(&tv,NULL);
time = 1.0 * tv.tv_sec + 1.0e-6 * tv.tv_usec;
return time;
}
/* ---------------------------------------------------------------------- */
/* include sizes of user defined datatypes, stored in extra lists */
static int stubtypesize(MPI_Datatype datatype)
{
if (datatype == MPI_INT) return sizeof(int);
else if (datatype == MPI_FLOAT) return sizeof(float);
else if (datatype == MPI_DOUBLE) return sizeof(double);
else if (datatype == MPI_CHAR) return sizeof(char);
else if (datatype == MPI_BYTE) return sizeof(char);
else if (datatype == MPI_LONG) return sizeof(long);
else if (datatype == MPI_LONG_LONG) return sizeof(uint64_t);
else if (datatype == MPI_DOUBLE_INT) return sizeof(double_int);
else {
int i;
for (i = 0; i < nextra_datatype; i++)
if (datatype == index_datatype[i]) return size_datatype[i];
}
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Type_size(MPI_Datatype datatype, int *size)
{
if (size == NULL) return MPI_ERR_ARG;
*size = stubtypesize(datatype);
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Send(const void *buf, int count, MPI_Datatype datatype,
int dest, int tag, MPI_Comm comm)
{
printf("MPI Stub WARNING: Should not send message to self\n");
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Isend(const void *buf, int count, MPI_Datatype datatype,
int source, int tag, MPI_Comm comm, MPI_Request *request)
{
printf("MPI Stub WARNING: Should not send message to self\n");
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Rsend(const void *buf, int count, MPI_Datatype datatype,
int dest, int tag, MPI_Comm comm)
{
printf("MPI Stub WARNING: Should not rsend message to self\n");
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Recv(void *buf, int count, MPI_Datatype datatype,
int source, int tag, MPI_Comm comm, MPI_Status *status)
{
printf("MPI Stub WARNING: Should not recv message from self\n");
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Irecv(void *buf, int count, MPI_Datatype datatype,
int source, int tag, MPI_Comm comm, MPI_Request *request)
{
printf("MPI Stub WARNING: Should not recv message from self\n");
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Wait(MPI_Request *request, MPI_Status *status)
{
printf("MPI Stub WARNING: Should not wait on message from self\n");
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Waitall(int n, MPI_Request *request, MPI_Status *status)
{
printf("MPI Stub WARNING: Should not wait on message from self\n");
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Waitany(int count, MPI_Request *request, int *index,
MPI_Status *status)
{
printf("MPI Stub WARNING: Should not wait on message from self\n");
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Sendrecv(const void *sbuf, int scount, MPI_Datatype sdatatype,
int dest, int stag, void *rbuf, int rcount,
MPI_Datatype rdatatype, int source, int rtag,
MPI_Comm comm, MPI_Status *status)
{
printf("MPI Stub WARNING: Should not send message to self\n");
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Get_count(MPI_Status *status, MPI_Datatype datatype, int *count)
{
printf("MPI Stub WARNING: Should not get count of message to self\n");
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Comm_split(MPI_Comm comm, int color, int key, MPI_Comm *comm_out)
{
*comm_out = comm;
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Comm_dup(MPI_Comm comm, MPI_Comm *comm_out)
{
*comm_out = comm;
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Comm_free(MPI_Comm *comm) {return 0;}
/* ---------------------------------------------------------------------- */
MPI_Fint MPI_Comm_c2f(MPI_Comm comm) { return comm; };
/* ---------------------------------------------------------------------- */
MPI_Comm MPI_Comm_f2c(MPI_Fint comm) { return comm; };
//* ---------------------------------------------------------------------- */
int MPI_Comm_group(MPI_Comm comm, MPI_Group *group)
{
*group = comm;
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Comm_create(MPI_Comm comm, MPI_Group group, MPI_Comm *newcomm)
{
*newcomm = group;
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Group_incl(MPI_Group group, int n, int *ranks, MPI_Group *newgroup)
{
if (n > 0)
*newgroup = MPI_COMM_WORLD;
else
*newgroup = group;
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Cart_create(MPI_Comm comm_old, int ndims, int *dims, int *periods,
int reorder, MPI_Comm *comm_cart)
{
*comm_cart = comm_old;
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Cart_get(MPI_Comm comm, int maxdims, int *dims, int *periods,
int *coords)
{
dims[0] = dims[1] = dims[2] = 1;
periods[0] = periods[1] = periods[2] = 1;
coords[0] = coords[1] = coords[2] = 0;
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Cart_shift(MPI_Comm comm, int direction, int displ,
int *source, int *dest)
{
*source = *dest = 0;
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Cart_rank(MPI_Comm comm, int *coords, int *rank)
{
*rank = 0;
return 0;
}
/* ---------------------------------------------------------------------- */
/* store size of user datatype in extra lists */
int MPI_Type_contiguous(int count, MPI_Datatype oldtype,
MPI_Datatype *newtype)
{
if (nextra_datatype == MAXEXTRA_DATATYPE) return -1;
ptr_datatype[nextra_datatype] = newtype;
index_datatype[nextra_datatype] = -(nextra_datatype + 1);
size_datatype[nextra_datatype] = count * stubtypesize(oldtype);
nextra_datatype++;
return 0;
}
/* ---------------------------------------------------------------------- */
/* set value of user datatype to internal negative index,
based on match of ptr */
int MPI_Type_commit(MPI_Datatype *datatype)
{
int i;
for (i = 0; i < nextra_datatype; i++)
if (datatype == ptr_datatype[i]) *datatype = index_datatype[i];
return 0;
}
/* ---------------------------------------------------------------------- */
/* remove user datatype from extra lists */
int MPI_Type_free(MPI_Datatype *datatype)
{
int i;
for (i = 0; i < nextra_datatype; i++)
if (datatype == ptr_datatype[i]) {
ptr_datatype[i] = ptr_datatype[nextra_datatype-1];
index_datatype[i] = index_datatype[nextra_datatype-1];
size_datatype[i] = size_datatype[nextra_datatype-1];
nextra_datatype--;
break;
}
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Op_create(MPI_User_function *function, int commute, MPI_Op *op)
{
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Op_free(MPI_Op *op)
{
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Barrier(MPI_Comm comm) {return 0;}
/* ---------------------------------------------------------------------- */
int MPI_Bcast(void *buf, int count, MPI_Datatype datatype,
int root, MPI_Comm comm) {return 0;}
/* ---------------------------------------------------------------------- */
/* copy values from data1 to data2 */
int MPI_Allreduce(void *sendbuf, void *recvbuf, int count,
MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
{
int n = count * stubtypesize(datatype);
if (sendbuf == MPI_IN_PLACE || recvbuf == MPI_IN_PLACE) return 0;
memcpy(recvbuf,sendbuf,n);
return 0;
}
/* ---------------------------------------------------------------------- */
/* copy values from data1 to data2 */
int MPI_Reduce(void *sendbuf, void *recvbuf, int count,
MPI_Datatype datatype, MPI_Op op,
int root, MPI_Comm comm)
{
int n = count * stubtypesize(datatype);
if (sendbuf == MPI_IN_PLACE || recvbuf == MPI_IN_PLACE) return 0;
memcpy(recvbuf,sendbuf,n);
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Scan(void *sendbuf, void *recvbuf, int count,
MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
{
int n = count * stubtypesize(datatype);
if (sendbuf == MPI_IN_PLACE || recvbuf == MPI_IN_PLACE) return 0;
memcpy(recvbuf,sendbuf,n);
return 0;
}
/* ---------------------------------------------------------------------- */
/* copy values from data1 to data2 */
int MPI_Allgather(void *sendbuf, int sendcount, MPI_Datatype sendtype,
void *recvbuf, int recvcount, MPI_Datatype recvtype,
MPI_Comm comm)
{
int n = sendcount * stubtypesize(sendtype);
if (sendbuf == MPI_IN_PLACE || recvbuf == MPI_IN_PLACE) return 0;
memcpy(recvbuf,sendbuf,n);
return 0;
}
/* ---------------------------------------------------------------------- */
/* copy values from data1 to data2 */
int MPI_Allgatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
void *recvbuf, int *recvcounts, int *displs,
MPI_Datatype recvtype, MPI_Comm comm)
{
int n = sendcount * stubtypesize(sendtype);
if (sendbuf == MPI_IN_PLACE || recvbuf == MPI_IN_PLACE) return 0;
memcpy(recvbuf,sendbuf,n);
return 0;
}
/* ---------------------------------------------------------------------- */
/* copy values from data1 to data2 */
int MPI_Reduce_scatter(void *sendbuf, void *recvbuf, int *recvcounts,
MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
{
int n = *recvcounts * stubtypesize(datatype);
if (sendbuf == MPI_IN_PLACE || recvbuf == MPI_IN_PLACE) return 0;
memcpy(recvbuf,sendbuf,n);
return 0;
}
/* ---------------------------------------------------------------------- */
/* copy values from data1 to data2 */
int MPI_Gather(void *sendbuf, int sendcount, MPI_Datatype sendtype,
void *recvbuf, int recvcount, MPI_Datatype recvtype,
int root, MPI_Comm comm)
{
int n = sendcount * stubtypesize(sendtype);
if (sendbuf == MPI_IN_PLACE || recvbuf == MPI_IN_PLACE) return 0;
memcpy(recvbuf,sendbuf,n);
return 0;
}
/* ---------------------------------------------------------------------- */
/* copy values from data1 to data2 */
int MPI_Gatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
void *recvbuf, int *recvcounts, int *displs,
MPI_Datatype recvtype, int root, MPI_Comm comm)
{
int n = sendcount * stubtypesize(sendtype);
if (sendbuf == MPI_IN_PLACE || recvbuf == MPI_IN_PLACE) return 0;
memcpy(recvbuf,sendbuf,n);
return 0;
}
/* ---------------------------------------------------------------------- */
/* copy values from data1 to data2 */
int MPI_Scatter(void *sendbuf, int sendcount, MPI_Datatype sendtype,
void *recvbuf, int recvcount, MPI_Datatype recvtype,
int root, MPI_Comm comm)
{
int n = recvcount * stubtypesize(recvtype);
if (sendbuf == MPI_IN_PLACE || recvbuf == MPI_IN_PLACE) return 0;
memcpy(recvbuf,sendbuf,n);
return 0;
}
/* ---------------------------------------------------------------------- */
/* copy values from data1 to data2 */
int MPI_Scatterv(void *sendbuf, int *sendcounts, int *displs,
MPI_Datatype sendtype, void *recvbuf, int recvcount,
MPI_Datatype recvtype, int root, MPI_Comm comm)
{
int n = recvcount * stubtypesize(recvtype);
if (sendbuf == MPI_IN_PLACE || recvbuf == MPI_IN_PLACE) return 0;
memcpy(recvbuf,sendbuf,n);
return 0;
}
/* ---------------------------------------------------------------------- */
/* copy values from data1 to data2 */
int MPI_Alltoall(void *sendbuf, int sendcount, MPI_Datatype sendtype,
void *recvbuf, int recvcount, MPI_Datatype recvtype,
MPI_Comm comm)
{
int n = sendcount * stubtypesize(sendtype);
if (sendbuf == MPI_IN_PLACE || recvbuf == MPI_IN_PLACE) return 0;
memcpy(recvbuf,sendbuf,n);
return 0;
}
/* ---------------------------------------------------------------------- */
/* copy values from data1 to data2 */
int MPI_Alltoallv(void *sendbuf, int *sendcounts, int *sdispls,
MPI_Datatype sendtype,
void *recvbuf, int *recvcounts, int *rdispls,
MPI_Datatype recvtype, MPI_Comm comm)
{
int n = *sendcounts * stubtypesize(sendtype);
if (sendbuf == MPI_IN_PLACE || recvbuf == MPI_IN_PLACE) return 0;
memcpy(recvbuf,sendbuf,n);
return 0;
}
/* ---------------------------------------------------------------------- */

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