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yap-6.3/library/mpi/mpi.c

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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright S. Konstantopoulos and Universidade do Porto 2002-2003 *
* *
**************************************************************************
* *
* File: mpi.c *
* Last rev: $Date: 2003-07-03 15:01:18 $ *
* mods: *
* comments: Interface to MPI libraries *
* *
*************************************************************************/
#ifndef lint
static char *rcsid = "$Header: /Users/vitor/Yap/yap-cvsbackup/library/mpi/mpi.c,v 1.20 2003-07-03 15:01:18 stasinos Exp $";
#endif
#include "Yap.h"
#if HAVE_MPI
#include "Yatom.h"
#include "yapio.h"
#include <stdlib.h>
#include <string.h>
#include <mpi.h>
void STD_PROTO(YAP_Write, (Term, void (*)(int), int));
STATIC_PROTO (Int p_mpi_open, (void));
STATIC_PROTO (Int p_mpi_close, (void));
STATIC_PROTO (Int p_mpi_send, (void));
STATIC_PROTO (Int p_mpi_receive, (void));
STATIC_PROTO (Int p_mpi_bcast3, (void));
STATIC_PROTO (Int p_mpi_bcast2, (void));
STATIC_PROTO (Int p_mpi_barrier, (void));
/*
* Auxiliary Data
*/
static Int rank, numprocs, namelen;
static char processor_name[MPI_MAX_PROCESSOR_NAME];
static Int mpi_argc;
static char **mpi_argv;
/* this should eventually be moved to config.h */
#define RECV_BUF_SIZE 1024*32
/*
* A simple stream
*/
static size_t bufsize, bufstrlen;
static char *buf;
static int bufptr;
static void
expand_buffer( int space )
{
#if MPI_AVOID_REALLOC
/*
realloc() has been SIGSEGV'ing on HP-UX 10.20, but there is
no problem in HP-UX 11.0. We can remove this bit here as soon
as Yap stops compiling on 10.20 anyway. If removed, also remove
the MPI_AVOID_REALLOC bits from configure.in and config.h.in
*/
char *tmp;
tmp = malloc( bufsize + space );
if( tmp == NULL ) {
Yap_Error(SYSTEM_ERROR, TermNil, "out of memory" );
Yap_exit( EXIT_FAILURE );
}
memcpy( tmp, buf, bufsize );
free( buf );
buf = tmp;
#else /* use realloc */
buf = realloc( buf, bufsize + space );
if( buf == NULL ) {
Yap_Error(SYSTEM_ERROR, TermNil, "out of memory");
Yap_exit( EXIT_FAILURE );
}
#endif
bufsize += space;
}
static void
mpi_putc(Int ch)
{
if( ch > 0 ) {
if( bufptr >= bufsize ) expand_buffer( RECV_BUF_SIZE );
buf[bufptr++] = ch;
}
}
/*
* C Predicates
*/
static Int
p_mpi_open(void) /* mpi_open(?rank, ?num_procs, ?proc_name) */
{
Term t_rank = Deref(ARG1), t_numprocs = Deref(ARG2), t_procname = Deref(ARG3);
Int retv;
/*
With MPICH MPI_Init() must be called during initialisation,
but with LAM it can be called from Prolog (mpi_open/3)
The symptoms match a known RedHat bug, see
http://email.osc.edu/pipermail/mpiexec/2002-July/000067.html
for a suggested workaround:
Redhat have somehow broken their sem.h and ipc.h. If you use your own
kernel, copy from ../src/kernel/include/asm & ../src/kernel/include/linux
the file ipc.h and sem.h to /usr/include/sys, recompile your mpich and
everything might start working. (it did for us)
*/
/*
Note that if MPI_Init() fails, Yap/MPICH and Yap/LAM behave differently:
in Yap/MPICH we are still at the Yap initialisation phase, so we get
Yap exit(FAILURE), whereas in Yap/LAM mpi_open/3 simply fails.
*/
retv = MPI_Init( &mpi_argc, &mpi_argv );
if( retv ) {
Term t;
t = MkIntegerTerm(retv);
Yap_Error( SYSTEM_ERROR, t, "MPI_Init() returned non-zero" );
return FALSE;
}
MPI_Comm_size( MPI_COMM_WORLD, &numprocs );
MPI_Comm_rank( MPI_COMM_WORLD, &rank );
MPI_Get_processor_name( processor_name, &namelen );
retv = Yap_unify(t_rank, MkIntTerm(rank));
retv = retv && Yap_unify(t_numprocs, MkIntTerm(numprocs));
retv = retv && Yap_unify(t_procname, MkAtomTerm(Yap_LookupAtom(processor_name)));
return retv;
}
static Int /* mpi_close */
p_mpi_close()
{
MPI_Finalize();
return TRUE;
}
static Int
p_mpi_send() /* mpi_send(+data, +destination, +tag) */
{
Term t_data = Deref(ARG1), t_dest = Deref(ARG2), t_tag = Deref(ARG3);
int tag, dest, retv;
/* The first argument (data) must be bound */
if (IsVarTerm(t_data)) {
Yap_Error(INSTANTIATION_ERROR, t_data, "mpi_send");
return (FALSE);
}
/* The second and third args must be bount to integers */
if (IsVarTerm(t_dest)) {
Yap_Error(INSTANTIATION_ERROR, t_dest, "mpi_send");
return (FALSE);
} else if( !IsIntegerTerm(t_dest) ) {
Yap_Error(TYPE_ERROR_INTEGER, t_dest, "mpi_send");
return (FALSE);
} else {
dest = IntOfTerm( t_dest );
}
if (IsVarTerm(t_tag)) {
Yap_Error(INSTANTIATION_ERROR, t_tag, "mpi_send");
return (FALSE);
} else if( !IsIntegerTerm(t_tag) ) {
Yap_Error(TYPE_ERROR_INTEGER, t_tag, "mpi_send");
return (FALSE);
} else {
tag = IntOfTerm( t_tag );
}
/* Turn the term into its ASCII representation */
bufptr = 0;
YAP_Write( t_data, mpi_putc, Quote_illegal_f|Handle_vars_f );
/* The buf is not NULL-terminated and does not have the
trailing ". " required by the parser */
mpi_putc( '.' );
mpi_putc( ' ' );
mpi_putc( 0 );
bufstrlen = strlen(buf);
/* send the data */
bufptr = 0;
retv = MPI_Send( &buf[bufptr], bufstrlen, MPI_CHAR, dest, tag, MPI_COMM_WORLD );
if( retv != MPI_SUCCESS ) return FALSE;
return TRUE;
}
static Int
p_mpi_receive() /* mpi_receive(-data, ?orig, ?tag) */
{
Term t, t_data = Deref(ARG1), t_orig = Deref(ARG2), t_tag = Deref(ARG3);
int tag, orig, retv;
MPI_Status status;
/* The first argument (data) must be unbound */
if(!IsVarTerm(t_data)) {
Yap_Error(INSTANTIATION_ERROR, t_data, "mpi_receive");
return FALSE;
}
/* The second argument (source) must be bound to an integer
(the rank of the source) or left unbound (i.e. any source
is OK) */
if (IsVarTerm(t_orig)) {
orig = MPI_ANY_SOURCE;
} else if( !IsIntegerTerm(t_orig) ) {
Yap_Error(TYPE_ERROR_INTEGER, t_orig, "mpi_receive");
return (FALSE);
} else {
orig = IntOfTerm( t_orig );
}
/* The third argument must be bound to an integer (the tag)
or left unbound (i.e. any tag is OK) */
if (IsVarTerm(t_tag)) {
tag = MPI_ANY_TAG;
} else if( !IsIntegerTerm(t_tag) ) {
Yap_Error(TYPE_ERROR_INTEGER, t_tag, "mpi_receive");
return (FALSE);
} else
tag = IntOfTerm( t_tag );
/* probe for the size of the term */
retv = MPI_Probe( orig, tag, MPI_COMM_WORLD, &status );
if( retv != MPI_SUCCESS ) {
return FALSE;
}
MPI_Get_count( &status, MPI_CHAR, &bufstrlen );
/* adjust the buffer */
if( bufsize < bufstrlen ) expand_buffer(bufstrlen-bufsize);
/* Already know the source from MPI_Probe() */
if( orig == MPI_ANY_SOURCE ) {
orig = status.MPI_SOURCE;
retv = Yap_unify(t_orig, MkIntTerm(orig));
if( retv == FALSE ) {
printf("PROBLEM: file %s, line %d\n", __FILE__, __LINE__);
}
}
/* Already know the tag from MPI_Probe() */
if( tag == MPI_ANY_TAG ) {
tag = status.MPI_TAG;
retv = Yap_unify(t_tag, MkIntTerm(status.MPI_TAG));
if( retv == FALSE ) {
printf("PROBLEM: file %s, line %d\n", __FILE__, __LINE__);
}
}
/* Receive the message as a C string */
retv = MPI_Recv( buf, bufstrlen, MPI_CHAR, orig, tag,
MPI_COMM_WORLD, &status );
if( retv != MPI_SUCCESS ) {
/* Getting in here would be weird; it means the first package
(size) was sent properly, but there was a glitch with
the actual content! */
return FALSE;
}
/* parse received string into a Prolog term */
bufptr = 0;
t = YAP_ReadBuffer( buf, NULL );
if( t == TermNil ) {
retv = FALSE;
}
else {
retv = Yap_unify(t, t_data);
}
return retv;
}
static Int
p_mpi_bcast3() /* mpi_bcast( ?data, +root, +max_size ) */
{
Term t_data = Deref(ARG1), t_root = Deref(ARG2), t_max_size = Deref(ARG3);
int root, retv, max_size;
/* The second argument must be bound to an integer (the rank of
root processor */
if (IsVarTerm(t_root)) {
Yap_Error(INSTANTIATION_ERROR, t_root, "mpi_bcast");
return FALSE;
}
root = IntOfTerm( t_root );
/* If this is the root processor, then the first argument must
be bound to the term to be sent. */
if( root == rank ) {
if( IsVarTerm(t_data) ) {
Yap_Error(INSTANTIATION_ERROR, t_data, "mpi_bcast");
return FALSE;
}
/* Turn the term into its ASCII representation */
bufptr = 0;
YAP_Write( t_data, mpi_putc, Quote_illegal_f|Handle_vars_f );
/* NULL-terminate the string and add the ". " termination
required by the parser. */
mpi_putc( '.' );
mpi_putc( ' ' );
mpi_putc( 0 );
bufstrlen = strlen(buf);
}
/* The third argument must be bound to an integer (the maximum length
of the broadcast term's ASCII representation */
if (IsVarTerm(t_max_size)) {
Yap_Error(INSTANTIATION_ERROR, t_max_size, "mpi_bcast");
return FALSE;
}
/* allow for the ". " bit and the NULL at the end */
max_size = IntOfTerm( t_max_size ) + 3;
if( max_size < bufstrlen ) {
/* issue a warning? explode? bcast s'thing unparsable? */
printf( "MAYDAY: max_size == %d, bufstrlen == %d\n ", max_size, bufstrlen);
return FALSE;
}
/* adjust the buffer size, if necessary */
if( max_size > bufsize ) {
expand_buffer( max_size-bufsize );
}
retv = MPI_Bcast( buf, max_size, MPI_CHAR, root, MPI_COMM_WORLD );
if( retv != MPI_SUCCESS ) {
printf( "OOOPS! MPI_Bcast() returned %d.\n", retv );
return FALSE;
}
if( root == rank ) return TRUE;
else {
/* ARG1 must be unbound so that it can receive data */
if( !IsVarTerm(t_data) ) {
Yap_Error(INSTANTIATION_ERROR, t_data, "mpi_bcast");
return FALSE;
}
bufstrlen = strlen(buf);
bufptr = 0;
/* parse received string into a Prolog term */
return Yap_unify( YAP_ReadBuffer( buf, NULL ), ARG1 );
}
}
/*
This is the same as above, but for dynamic data size.
It is implemented as two broadcasts, the first being the size
and the second the actual data.
*/
static Int
p_mpi_bcast2() /* mpi_bcast( ?data, +root ) */
{
Term t_data = Deref(ARG1), t_root = Deref(ARG2);
int root, retv;
/* The second argument must be bound to an integer (the rank of
root processor */
if (IsVarTerm(t_root)) {
Yap_Error(INSTANTIATION_ERROR, t_root, "mpi_bcast");
return FALSE;
}
root = IntOfTerm( t_root );
/* If this is the root processor, then the first argument must
be bound to the term to be sent. */
if( root == rank ) {
if( IsVarTerm(t_data) ) {
Yap_Error(INSTANTIATION_ERROR, t_data, "mpi_bcast");
return FALSE;
}
bufptr = 0;
/* Turn the term into its ASCII representation */
YAP_Write( t_data, mpi_putc, Quote_illegal_f|Handle_vars_f );
/* NULL-terminate the string and add the ". " termination
required by the parser. */
buf[bufptr] = 0;
strcat( buf, ". " );
bufstrlen = bufptr + 2;
}
/* Otherwise, it must a variable */
else {
if( !IsVarTerm(t_data) ) {
Yap_Error(INSTANTIATION_ERROR, t_data, "mpi_bcast");
return FALSE;
}
}
/* Broadcast the data size */
retv = MPI_Bcast( &bufstrlen, sizeof bufstrlen, MPI_INT, root, MPI_COMM_WORLD );
if( retv != MPI_SUCCESS ) {
printf("PROBLEM: file %s, line %d\n", __FILE__, __LINE__);
return FALSE;
}
/* adjust the buffer size, if necessary */
if( bufstrlen > bufsize ) {
expand_buffer( bufstrlen - bufsize );
}
/* Broadcast the data */
retv = MPI_Bcast( buf, bufstrlen, MPI_CHAR, root, MPI_COMM_WORLD );
if( retv != MPI_SUCCESS ) {
printf("PROBLEM: file %s, line %d\n", __FILE__, __LINE__);
return FALSE;
}
if( root == rank ) return TRUE;
else {
/* ARG1 must be unbound so that it can receive data */
if( !IsVarTerm(t_data) ) {
Yap_Error(INSTANTIATION_ERROR, t_data, "mpi_bcast");
return FALSE;
}
bufstrlen = strlen(buf);
bufptr = 0;
return Yap_unify(YAP_ReadBuffer( buf, NULL ), ARG1);
}
}
static Int
p_mpi_barrier() /* mpi_barrier/0 */
{
int retv;
retv = MPI_Barrier( MPI_COMM_WORLD );
return (retv == 0);
}
/*
* Init
*/
void
Yap_InitMPI(void)
{
int i,j;
mpi_argv = malloc( GLOBAL_argc * sizeof(char *) );
mpi_argv[0] = strdup( GLOBAL_argv[0] );
bufsize = RECV_BUF_SIZE;
buf = malloc(bufsize * sizeof(char));
for( i=1; i<GLOBAL_argc; ++i ) {
if( !strcmp(GLOBAL_argv[i], "--") ) { ++i; break; }
}
for( j=1; i<GLOBAL_argc; ++i, ++j ) {
mpi_argv[j] = strdup( GLOBAL_argv[i] );
}
mpi_argc = j;
mpi_argv[0] = strdup( GLOBAL_argv[0] );
Yap_InitCPred( "mpi_open", 3, p_mpi_open, SafePredFlag|SyncPredFlag );
Yap_InitCPred( "mpi_close", 0, p_mpi_close, SafePredFlag|SyncPredFlag );
Yap_InitCPred( "mpi_send", 3, p_mpi_send, SafePredFlag|SyncPredFlag );
Yap_InitCPred( "mpi_receive", 3, p_mpi_receive, SafePredFlag|SyncPredFlag );
Yap_InitCPred( "mpi_bcast", 3, p_mpi_bcast3, SafePredFlag|SyncPredFlag );
Yap_InitCPred( "mpi_bcast", 2, p_mpi_bcast2, SafePredFlag|SyncPredFlag );
Yap_InitCPred( "mpi_barrier", 0, p_mpi_barrier, SafePredFlag|SyncPredFlag );
}
#endif /* HAVE_MPI */