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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 */
#include "stdlib.h"
#include "string.h"
#include "stdio.h"
#include "stdint.h"
#include <sys/time.h>
#include "mpi.h"
/* lo-level data structure */
struct _mpi_double_int {
double value;
int proc;
};
typedef struct _mpi_double_int double_int;
/* ---------------------------------------------------------------------- */
/* MPI Functions */
/* ---------------------------------------------------------------------- */
int MPI_Init(int *argc, char ***argv) {return 0;}
/* ---------------------------------------------------------------------- */
int MPI_Initialized(int *flag)
{
*flag = 1;
return 0;
}
/* ---------------------------------------------------------------------- */
/* return "localhost" as name of the processor */
void MPI_Get_processor_name(char *name, int *resultlen)
{
const char host[] = "localhost";
int len;
if (!name || !resultlen) return;
len = strlen(host);
memcpy(name,host,len+1);
*resultlen = len;
return;
}
/* ---------------------------------------------------------------------- */
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() {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;
}
/* ---------------------------------------------------------------------- */
int MPI_Type_size(MPI_Datatype datatype, int *size)
{
if (datatype == MPI_INT) *size = sizeof(int);
else if (datatype == MPI_FLOAT) *size = sizeof(float);
else if (datatype == MPI_DOUBLE) *size = sizeof(double);
else if (datatype == MPI_CHAR) *size = sizeof(char);
else if (datatype == MPI_BYTE) *size = sizeof(char);
else if (datatype == MPI_LONG_LONG) *size = sizeof(uint64_t);
else if (datatype == MPI_DOUBLE_INT) *size = sizeof(double_int);
return 0;
}
/* ---------------------------------------------------------------------- */
int MPI_Send(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_Rsend(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(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;}
/* ---------------------------------------------------------------------- */
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;
}
/* ---------------------------------------------------------------------- */
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;
if (datatype == MPI_INT) n = count*sizeof(int);
else if (datatype == MPI_FLOAT) n = count*sizeof(float);
else if (datatype == MPI_DOUBLE) n = count*sizeof(double);
else if (datatype == MPI_CHAR) n = count*sizeof(char);
else if (datatype == MPI_BYTE) n = count*sizeof(char);
else if (datatype == MPI_LONG_LONG) n = count*sizeof(uint64_t);
else if (datatype == MPI_DOUBLE_INT) n = count*sizeof(double_int);
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;
if (datatype == MPI_INT) n = count*sizeof(int);
else if (datatype == MPI_FLOAT) n = count*sizeof(float);
else if (datatype == MPI_DOUBLE) n = count*sizeof(double);
else if (datatype == MPI_CHAR) n = count*sizeof(char);
else if (datatype == MPI_BYTE) n = count*sizeof(char);
else if (datatype == MPI_LONG_LONG) n = count*sizeof(uint64_t);
else if (datatype == MPI_DOUBLE_INT) n = count*sizeof(double_int);
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;
if (datatype == MPI_INT) n = count*sizeof(int);
else if (datatype == MPI_FLOAT) n = count*sizeof(float);
else if (datatype == MPI_DOUBLE) n = count*sizeof(double);
else if (datatype == MPI_CHAR) n = count*sizeof(char);
else if (datatype == MPI_BYTE) n = count*sizeof(char);
else if (datatype == MPI_LONG_LONG) n = count*sizeof(uint64_t);
else if (datatype == MPI_DOUBLE_INT) n = count*sizeof(double_int);
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;
if (sendtype == MPI_INT) n = sendcount*sizeof(int);
else if (sendtype == MPI_FLOAT) n = sendcount*sizeof(float);
else if (sendtype == MPI_DOUBLE) n = sendcount*sizeof(double);
else if (sendtype == MPI_CHAR) n = sendcount*sizeof(char);
else if (sendtype == MPI_BYTE) n = sendcount*sizeof(char);
else if (sendtype == MPI_LONG_LONG) n = sendcount*sizeof(uint64_t);
else if (sendtype == MPI_DOUBLE_INT) n = sendcount*sizeof(double_int);
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;
if (sendtype == MPI_INT) n = sendcount*sizeof(int);
else if (sendtype == MPI_FLOAT) n = sendcount*sizeof(float);
else if (sendtype == MPI_DOUBLE) n = sendcount*sizeof(double);
else if (sendtype == MPI_CHAR) n = sendcount*sizeof(char);
else if (sendtype == MPI_BYTE) n = sendcount*sizeof(char);
else if (sendtype == MPI_LONG_LONG) n = sendcount*sizeof(uint64_t);
else if (sendtype == MPI_DOUBLE_INT) n = sendcount*sizeof(double_int);
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;
if (datatype == MPI_INT) n = *recvcounts*sizeof(int);
else if (datatype == MPI_FLOAT) n = *recvcounts*sizeof(float);
else if (datatype == MPI_DOUBLE) n = *recvcounts*sizeof(double);
else if (datatype == MPI_CHAR) n = *recvcounts*sizeof(char);
else if (datatype == MPI_BYTE) n = *recvcounts*sizeof(char);
else if (datatype == MPI_LONG_LONG) n = *recvcounts*sizeof(uint64_t);
else if (datatype == MPI_DOUBLE_INT) n = *recvcounts*sizeof(double_int);
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;
if (sendtype == MPI_INT) n = sendcount*sizeof(int);
else if (sendtype == MPI_FLOAT) n = sendcount*sizeof(float);
else if (sendtype == MPI_DOUBLE) n = sendcount*sizeof(double);
else if (sendtype == MPI_CHAR) n = sendcount*sizeof(char);
else if (sendtype == MPI_BYTE) n = sendcount*sizeof(char);
else if (sendtype == MPI_LONG_LONG) n = sendcount*sizeof(uint64_t);
else if (sendtype == MPI_DOUBLE_INT) n = sendcount*sizeof(double_int);
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;
if (sendtype == MPI_INT) n = sendcount*sizeof(int);
else if (sendtype == MPI_FLOAT) n = sendcount*sizeof(float);
else if (sendtype == MPI_DOUBLE) n = sendcount*sizeof(double);
else if (sendtype == MPI_CHAR) n = sendcount*sizeof(char);
else if (sendtype == MPI_BYTE) n = sendcount*sizeof(char);
else if (sendtype == MPI_LONG_LONG) n = sendcount*sizeof(uint64_t);
else if (sendtype == MPI_DOUBLE_INT) n = sendcount*sizeof(double_int);
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;
if (sendtype == MPI_INT) n = recvcount*sizeof(int);
else if (sendtype == MPI_FLOAT) n = recvcount*sizeof(float);
else if (sendtype == MPI_DOUBLE) n = recvcount*sizeof(double);
else if (sendtype == MPI_CHAR) n = recvcount*sizeof(char);
else if (sendtype == MPI_BYTE) n = recvcount*sizeof(char);
else if (sendtype == MPI_LONG_LONG) n = recvcount*sizeof(uint64_t);
else if (sendtype == MPI_DOUBLE_INT) n = recvcount*sizeof(double_int);
memcpy(recvbuf,sendbuf,n);
return 0;
}

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