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LnxMPI_S.c
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LnxMPI_S.c
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/* Partial MPI library based on Sockets in Linux,
using TCP/IP protocol.
No local buffering of messages is implemented, so that all messages
must be received in the order sent, and receives with wildcard
sources are not supported. the following subroutines are implemented:
MPI_Init, MPI_Finalize, MPI_Send, MPI_Recv, MPI_Isend, MPI_Irecv
MPI_Test, MPI_Wait, MPI_Sendrecv, MPI_Ssend, MPI_Issend, MPI_Waitall
MPI_Waitany, MPI_Get_count, MPI_Initialized, MPI_Comm_size
MPI_Comm_rank, MPI_Comm_dup, MPI_Comm_split, MPI_Comm_free
MPI_Cart_create, MPI_Cart_coords, MPI_Cart_get, MPI_Cart_shift
MPI_Cart_rank, MPI_Cart_sub, MPI_Dims_create
MPI_Bcast, MPI_Barrier, MPI_Reduce, MPI_Scan
MPI_Allreduce, MPI_Gather, MPI_Allgather, MPI_Scatter, MPI_Alltoall
MPI_Gatherv, MPI_Allgatherv, MPI_Scatterv, MPI_Alltoallv
MPI_Reduce_scatter, MPI_Abort, MPI_Wtime, MPI_Wtick, MPI_Type_extent
MPI_Request_free, MPI_Get_processor_name, MPI_Errhandler_set
Sockets are described in Unix: Network Programming, vol. 1, by
W. Richards Stevens [Prentice Hall PTR, Upper Saddle River, NJ, 1998].
The Message Passing Interface (MPI) is described in the reference,
M. Snir, S. Otto, S. Huss-Lederman, D. Walker, and J. Dongarra,
MPI: The Complete Reference [MIT Press, Cambridge, MA,1996].
The file MPIerrs is used throughout for error messages
written by viktor k. decyk, ucla
copyright 2002, regents of the university of california.
all rights reserved.
no warranty for proper operation of this software is given or implied.
software or information may be copied, distributed, and used at own
risk; it may not be distributed without this notice included verbatim
with each file.
update: august 16, 2005 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "mpi.h"
#include <sys/types.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <sys/utsname.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
/* #include <sys/filio.h> This is needed by Sun Solaris */
#include <sys/uio.h>
#include <net/if.h>
#include <netdb.h>
#include <unistd.h>
#include <signal.h>
/* MAXS = maximum number of nodes connected */
#define MAXS 64
/* MAXM = maximum number of outstanding messages on a node */
#define MAXM (2*MAXS)
/* MAXC = maximum number of communicators */
#define MAXC 10
/* MAXD = maximum number of topology dimensions */
#define MAXD 6
/* internal mpi common block
nproc = number of real or virtual processors obtained
idproc = processor id
epref = array of socket endpoints for each participating node
ioc = array of context pointers for notifier function
fstime = first time stamp if MPI_Init successful
mapcomm = communicator map
maxfds = maximum descriptor value
fdsset = fd_set reprsenting all endpoints
sset = signal mask */
static int nproc = -1, idproc;
static int epref[MAXS+2];
static int ioc[MAXS+2][4], mapcomm[MAXC][MAXS+MAXD+3];
static struct timeval fstime;
static int maxfds;
static fd_set fdsset;
static sigset_t sset;
/* internal common block for non-blocking messages
monitor = (0,1,2) = (suppress,display,display & log) monitor messages
curreq = request record for transmission parameters
header = message envelope
rwrec = read/write record for asynchronous messages
trash = trash bin for unwanted data
mqueue = message request queue */
struct RWRec {
int ref;
int ioflag;
void *buf;
size_t nbytes;
int flags;
void *sbuf;
int sln;
int len;
struct timeval ts[2];
int nextm;
int nfatal;
};
struct ipdata {
struct iovec iov[2];
int hdata[4];
};
static int monitor = 1, curreq[MAXM][5], mqueue[MAXS+2][2];
static struct ipdata header[MAXM];
static struct RWRec rwrec[MAXM];
static unsigned char trash[1024];
/* internal common block for error handler
errh = error handler */
static int errh[MAXC];
static FILE *unit2;
/* prototypes for internal procedures */
static void alarmf(int signo);
static void notifier(int signo);
long otpinit(int np, struct sockaddr_in *addrn, int alen);
long etmsec(struct timeval *ptime);
long sbtusec(struct timeval *pstime, struct timeval *crtime);
int ioresult(int *pblock);
int checkesc(long stk);
void sndmsgf(MPI_Request request, int dest);
void rcvmsgf(MPI_Request request, int source);
static int imax(int val1, int val2);
static int imin(int val1, int val2);
static float flmax(float val1, float val2);
static float flmin(float val1, float val2);
static double dmax(double val1, double val2);
static double dmin(double val1, double val2);
static void iredux(int *recvbuf, int *sendbuf, int offset, int count, MPI_Op op);
static void fredux(float *recvbuf, float *sendbuf, int offset, int count, MPI_Op op);
static void dredux(double *recvbuf, double *sendbuf, int offset, int count, MPI_Op op);
void writerrs(char *source, int ierror);
void rwstat(int request, FILE *unit);
void wqueue(FILE *unit);
void messwin(int nvp);
void logmess(int idp, int lstat, int lsize, int mticks, int tag);
void showmess(int idp, int istat, int istyle);
void showdism(int ibin, int nbin, int mbin, int lmax, int istyle);
void shospeed(float atime, float ctime, float arate, float crate);
void Logname(char *name);
void Set_Mon(int monval);
int Get_Mon();
void delmess();
/* function definitions */
int MPI_Init(int *argc, char ***argv) {
/* initialize the MPI execution environment
input: argc, argv, output: none
local data */
int ierror, nerr, nv, i, alen;
int portnum = 0, pshift = 0, pnumid[3], epnum[8];
long oss, response;
char *cnerr = 0;
struct utsname uinfo;
struct hostent *info;
struct in_addr address, oldadd;
char ename[36], myself[36], location[18], fname[18];
struct sockaddr_in addrn, addrb, addrl;
struct timeval ptime;
struct sigaction act;
MPI_Status stat;
FILE *unit3;
/* internal mpi common block
nproc = number of real or virtual processors obtained
idproc = processor id
epref = array of socket endpoints for each participating node
ioc = array of context pointers for notifier function
ioc[i][0] = endpoint reference for notifier for endpoint i
ioc[i][1] = processor id for listener for endpoint i
ioc[i][2] = handle for current receive from endpoint i
ioc[i][3] = handle for current send to endpoint i
fstime = first time stamp if MPI_Init successful
maxfds = maximum descriptor value
fdsset = fd_set reprsenting all endpoints
sset = signal mask
mapcomm = communicator map
mapcomm[i][0:nproc-1] = actual proc id for given rank in communicator i
mapcomm[i][nproc:MAXS-1] = MPI_UNDEFINED
mapcomm[i][MAXS] = number of processes in comm i
mapcomm[i][MAXS+1] = rank for this node in comm i
mapcomm[i][MAXS+2] = ndims = number of dimensions in topology in comm i
mapcomm[i][iMAXS+3:MAXS+2+ndims] = size of dimension in comm i,
negative if non-periodic
mapcomm[i][MAXS+3+ndims:MAXS+2+MAXD] = 0 */
/* internal common block for non-blocking messages
monitor = (0,1,2) = (suppress,display,display & log) monitor messages
curreq = request record for transmission parameters, see rwstat
header = message envelope
hdata[i][0] = communicator, hdata[i][1] = tag, hdata[i][2] = datatype
hdata[i][3] = length of data (in bytes) for message handle i
rwrec = read/write record for asynchronous messages, see rwstat
mqueue = message request queue
mqueue[i][0] = end of message queue for receives from endpoint i
mqueue[i][1] = end of message queue for sends to endpoint i */
/* internal common block for adsp
epref0 = endpoint reference used by tcp and adsp providers */
/* Initialize common block data */
for (i = 0; i < MAXS+2; i++) {
epref[i] = 0;
for (nv = 0; nv < 2; nv++)
mqueue[i][nv] = 0;
}
for (i = 0; i < MAXC; i++) {
for (nv = 0; nv < MAXS+MAXD+3; nv++)
mapcomm[i][nv] = 0;
}
for (i = 0; i < MAXM; i++) {
for (nv = 0; nv < 5; nv++)
curreq[i][nv] = 0;
}
/* Set MPI_COMM_WORLD and MPI_COMM_SELF mapping */
for (i = 0; i < MAXS; i++) {
mapcomm[0][i] = i;
mapcomm[1][i] = MPI_UNDEFINED;
}
/* make all errors fatal */
for (i = 0; i < MAXC; i++) {
errh[i] = MPI_ERRORS_ARE_FATAL;
}
/* Zero out descriptor array */
FD_ZERO(&fdsset);
/* Open error file */
unit2 = fopen("MPIerrs","w");
if (monitor==2)
fprintf(unit2,"MPI_Init started\n");
/* Obtain the current time stamp */
oss = gettimeofday(&fstime,NULL);
if (oss < 0) {
oss = errno;
fprintf(unit2,"Gettimeofday Error = %d, %s\n",oss,strerror(oss));
}
/* Obtain information about the Internet environment */
oss = uname(&uinfo);
if (oss < 0) {
ierror = errno;
fprintf(unit2,"Uname Error = %d, %s\n",ierror,strerror(ierror));
return ierror;
}
strcpy(myself,uinfo.nodename);
/* debug */
if (monitor==2) {
fprintf(unit2,"local host name=%s\n",myself);
}
info = gethostbyname(uinfo.nodename);
if (info==NULL) {
oss = h_errno;
fprintf(unit2,"Gethostbyname Error = %d for %s\n",oss,myself);
fprintf(unit2,"%s, Trying INADDR_ANY\n",hstrerror(oss));
address.s_addr = INADDR_ANY;
}
else {
/* debug */
if (monitor==2) {
i = 1;
cnerr = ((info->h_addr_list)[i]);
while (cnerr) {
address.s_addr = *(in_addr_t *) cnerr;
cnerr = inet_ntoa(address);
strcpy(myself,cnerr);
fprintf(unit2,"other local addresses=%d,%s\n",i,myself);
i =+ 1;
cnerr = ((info->h_addr_list)[i]);
}
}
address.s_addr = *(in_addr_t *) ((info->h_addr_list)[0]);
}
cnerr = inet_ntoa(address);
strcpy(myself,cnerr);
/* debug */
if (monitor==2) {
fprintf(unit2,"local address=%s\n",myself);
}
oldadd = address;
/*
Everyone opens a port
*/
/* Open file containing portnum (and possibly participating nodes)
first line in nodelist file on all nodes contains common portnum
if the file is missing or empty, a default number of 5013 is used */
unit3 = fopen("nodelist_ip","r");
if (!unit3)
unit3 = fopen("nodelist","r");
if (unit3) {
cnerr = fgets(location,11,unit3);
if (!cnerr)
strcpy(location,"5013");
/* Replace trailing newlines with nulls */
cnerr = strchr(location,'\n');
if (cnerr)
cnerr[0] = '\0';
if (location[0]=='\0')
strcpy(location,"5013");
}
else
strcpy(location,"5013");
/* Convert string to integer */
nerr = sscanf(location,"%d",&portnum);
if ((!nerr) || (portnum < 5000) || (portnum > 49152))
portnum = 5013;
/* Construct sockaddr_in of listener */
addrn.sin_family = AF_INET;
addrn.sin_port = portnum;
addrn.sin_addr.s_addr = INADDR_ANY;
/* addrn.sin_addr = address; */
alen = sizeof(addrn);
for (i = 0; i < 8; i++)
addrn.sin_zero[i] = '\0';
strcpy(ename,myself);
nproc = 0;
/* Initialize synchronous listener endpoint provider */
oss = otpinit(MAXS+1,&addrn,alen);
if (oss) {
ierror = oss;
nerr = MPI_Finalize();
return ierror;
}
/* Save copy of portnum */
pnumid[0] = addrn.sin_port;
/* Set struct sockaddr_in for address which is returned */
nerr = alen;
oss = getsockname(epref[MAXS+1],(struct sockaddr *)&addrb,&nerr);
if (oss < 0) {
ierror = errno;
fprintf(unit2,"Getsockname Error = %d, %s\n",ierror,strerror(ierror));
nerr = MPI_Finalize();
return ierror;
}
/* Pass processor id to listener notifier */
ioc[MAXS+1][1] = nproc + 1;
/* debug */
if (monitor==2)
fprintf(unit2,"listener=%s,port=%d,socket=%d\n",myself,portnum,
epref[MAXS+1]);
/*
Determine if node is master (idproc=0) or slave (idproc>0).
on the master node, the second and subsequent lines of nodelist file
contain IP addresses of the nodes participating, in dotted-decimal
format (for example, "12.13.14.15").
if this list of nodes is missing, then the node is a slave.
every node also makes a connection to itself.
*/
if (unit3) {
cnerr = fgets(location,17,unit3);
}
/* Must be slave */
if (!unit3 || !cnerr)
idproc = 1;
else {
/* Replace trailing newlines with nulls */
cnerr = strchr(location,'\n');
if (cnerr)
cnerr[0] = '\0';
/* Must be slave */
if (location[0]=='\0')
idproc = 1;
/* May be master */
else {
if (((!strcmp(location,"self")) || (!strcmp(location,myself)))
&& (pnumid[0]==portnum)) {
idproc = 0;
/* Delete file if empty */
if (!fseek(unit2,0,SEEK_END)) {
i = ftell(unit2);
fclose(unit2);
if (!i)
remove("MPIerrs");
}
sprintf(fname,"MPIerrs%.2d",idproc);
unit2 = fopen(fname,"w");
}
else
/* Must be slave */
idproc = 1;
}
}
/* Update port number */
portnum = pnumid[0];
/*
* * * begin main iteration loop * * *
Prepare to accept connection
*/
/* Establish connection end */
/* Listen for an incoming connection request */
L10: oss = listen(epref[MAXS+1],1);
if (oss < 0) {
ierror = errno;
fprintf(unit2,"Listen Error = %d, %s\n",ierror,strerror(ierror));
nerr = MPI_Finalize();
return ierror;
}
/* Prepare alarm */
act.sa_handler = alarmf;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
oss = sigaction(SIGALRM,&act,NULL);
if (oss < 0) {
ierror = errno;
fprintf(unit2,"Sigaction SIGALRM Error = %d, %s\n",ierror,
strerror(ierror));
nerr = MPI_Finalize();
return ierror;
}
/* For connections to oneself, jump to connect */
if (idproc==nproc) {
ioc[MAXS+1][1] = MAXS+2;
goto L70;
}
/* Set alarm */
alarm(60);
/* Accept an incoming connection request */
nerr = alen;
epref[nproc] = accept(epref[MAXS+1],(struct sockaddr *)&addrl,&nerr);
/* Clear alarm */
alarm(0);
if (epref[nproc] < 0) {
ierror = errno;
if (ierror==EINTR)
ierror = ETIMEDOUT;
fprintf(unit2,"Accept Error = %d, %s\n",ierror,strerror(ierror));
return ierror;
}
ioc[nproc][0] = nproc;
ioc[nproc][1] = 0;
/* debug */
if (monitor==2) {
cnerr = inet_ntoa(addrl.sin_addr);
fprintf(unit2,"socket=%d accepted connection with=%s,%d\n",
epref[nproc],cnerr,addrl.sin_port);
}
ioc[MAXS+1][1] = 0;
/* Receive portnum for verification and processor id from remote node */
nproc += 1;
mapcomm[0][MAXS] = nproc;
/* Reset iocompletion flag to notifier */
ioc[MAXS+1][1] = nproc + 1;
ierror = MPI_Recv(epnum,3,MPI_INT,nproc-1,3,0,&stat);
/* Extract processor id on first connection */
if (nproc==1) {
idproc = epnum[1];
pshift = portnum - epnum[2];
portnum = epnum[2];
mapcomm[0][MAXS+1] = idproc;
/* Delete file if empty */
if (!fseek(unit2,0,SEEK_END)) {
i = ftell(unit2);
fclose(unit2);
if (!i)
remove("MPIerrs");
}
sprintf(fname,"MPIerrs%.2d",idproc);
unit2 = fopen(fname,"w");
}
/* Check if remote portnum agrees with local portnum */
nerr = pnumid[0] - epnum[0];
/* Send reject flag to remote node */
ierror = MPI_Send(&nerr,1,MPI_INT,nproc-1,4,0);
/* Reject if portnums disagree */
if (nerr) {
fprintf(unit2,"Session rejected, idproc = %d\n",idproc);
fprintf(unit2,"Portnums do not agree\n");
ierror = 5;
fprintf(unit2,"remote portnum = %d\n",epnum[0]);
nerr = MPI_Finalize();
return ierror;
}
/* Check for processor number overflow */
if (nproc > MAXS) {
fprintf(unit2,"processor number overflow, nproc = %d\n",nproc);
ierror = 6;
nerr = MPI_Finalize();
return ierror;
}
/* debug */
if (monitor==2)
fprintf(unit2,"connection accepted with idproc=%d\n",nproc-1);
/* Accept more connections */
if (idproc >= nproc)
goto L10;
/*
Master prepares to start connection
*/
/* Find internet address of requested node */
/* Convert a character string into an address */
L40: oss = inet_aton(location,&address);
if (!oss) {
fprintf(unit2,"inet_aton failed, location = %s\n",location);
fprintf(unit2,"Invalid nodelist file possibly being used\n");
ierror = oss;
nerr = MPI_Finalize();
return ierror;
}
/* Second cpu on a node uses incremented port number */
if (address.s_addr==oldadd.s_addr)
pshift = pshift + 1;
else {
pshift = 0;
oldadd = address;
}
pnumid[0] = portnum + pshift;
addrn.sin_family = AF_INET;
addrn.sin_port = pnumid[0];
/* addrn.sin_addr.s_addr = INADDR_ANY; */
addrn.sin_addr = address;
for (i = 0; i < 8; i++)
addrn.sin_zero[i] = '\0';
/* Convert an address into a character string */
cnerr = inet_ntoa(address);
strcpy(ename,cnerr);
/* Establish connection end */
/* Create a new socket for this endpoint */
L70: addrb.sin_port = 0;
/* Initialize synchronous endpoint provider */
oss = otpinit(nproc,&addrb,alen);
if (oss) {
ierror = oss;
nerr = MPI_Finalize();
return ierror;
}
/* debug */
if (monitor==2)
fprintf(unit2,"socket=%d requesting connection with=%s,%d\n",
epref[nproc],ename,pnumid[0]);
/* Pause to let OS get some time */
if (checkesc(1)) {
ierror = -9;
writerrs("MPI_Init: ",ierror);
return ierror;
}
/* Obtain the current time stamp */
oss = gettimeofday(&ptime,NULL);
/* Set alarm */
alarm(60);
/* Request a connection to a remote peer */
oss = connect(epref[nproc],(struct sockaddr *)&addrn,alen);
/* Clear alarm */
alarm(0);
if (oss < 0) {
ierror = errno;
if (ierror==EINTR)
ierror = ETIMEDOUT;
fprintf(unit2,"Connect Error = %d, %s\n",ierror,strerror(ierror));
return ierror;
}
/* Accept an incoming connection request to oneself */
if (idproc==nproc) {
nerr = alen;
epref[MAXS] = accept(epref[MAXS+1],(struct sockaddr *)&addrl,&nerr);
if (epref[MAXS] < 0) {
ierror = errno;
fprintf(unit2,"Accept Error = %d, %s\n",ierror,strerror(ierror));
return ierror;
}
ioc[MAXS][0] = MAXS;
ioc[MAXS][1] = 0;
/* debug */
if (monitor==2) {
cnerr = inet_ntoa(addrl.sin_addr);
fprintf(unit2,"self socket=%d accepted connection with=%s,%d\n",
epref[MAXS],cnerr,addrl.sin_port);
}
}
ioc[nproc][1] = 0;
/* debug */
if (monitor==2) {
nerr = alen;
oss = getpeername(epref[nproc],(struct sockaddr *)&addrl,&nerr);
if (oss < 0) {
oss = errno;
fprintf(unit2,"Getpeername Error = %d, %s\n",oss,strerror(oss));
addrl.sin_addr.s_addr = 0;
}
cnerr = inet_ntoa(addrl.sin_addr);
fprintf(unit2,"tentative connection started with=%s,%d\n",cnerr,
addrl.sin_port);
}
/* Send portnum for verification and processor id to remote node */
nerr = nproc;
nproc += 1;
mapcomm[0][MAXS] = nproc;
if (nerr > idproc) {
/* Set processor id */
pnumid[1] = nerr;
pnumid[2] = portnum;
ierror = MPI_Send(pnumid,3,MPI_INT,nproc-1,3,0);
/* Read and check reject flag */
ierror = MPI_Recv(&nerr,1,MPI_INT,nproc-1,4,0,&stat);
if (nerr) {
fprintf(unit2,"Connection rejected, reject info = %d\n",nerr);
fprintf(unit2,"Portnums do not agree, idproc = %d\n",nproc-1);
ierror = 12;
nerr = MPI_Finalize();
return ierror;
}
}
/* Check for processor number overflow */
if (nproc > MAXS) {
fprintf(unit2,"processor number overflow, nproc = %d\n",nproc);
ierror = 6;
nerr = MPI_Finalize();
return ierror;
}
/* debug */
if (monitor==2)
fprintf(unit2,"connection confirmed with idproc=%d\n",nproc-1);
/* Pass current location to next node */
if (nproc > (idproc+2))
nerr = MPI_Send(location,4,MPI_INT,idproc+1,1,0);
/* Read location of next node from file */
if (idproc==0) {
if ((nproc >= 2) || (!strcmp(location,"self")) || (!strcmp(location,myself))) {
if (!unit3)
goto L90;
cnerr = fgets(location,17,unit3);
if (!cnerr)
goto L90;
/* Replace trailing newlines with nulls */
cnerr = strchr(location,'\n');
if (cnerr)
cnerr[0] = '\0';
if (location[0]=='\0')
goto L90;
}
}
/* Receive location of next node from another processor */
else {
nerr = MPI_Recv(location,4,MPI_INT,idproc-1,1,0,&stat);
/* End of file marker received */
if (stat.len==0)
goto L90;
}
/* Start another connection */
goto L40;
/*
* * * end main iteration loop * * *
*/
/* All expected nodes activated */
L90: nv = nproc - 1;
/* debug */
if (monitor==2)
fprintf(unit2,"all nodes activated, idproc, nproc=%d,%d\n",
idproc,nproc);
/* Send null record to next processor */
if (idproc < nv)
nerr = MPI_Send(location,0,MPI_INT,idproc+1,1,0);
if (unit3)
fclose(unit3);
/* Check number of processors */
if (idproc==nv) {
for (i = 1; i <= nv; i++) {
nerr = MPI_Send(&nproc,1,MPI_INT,nv-i,2,0);
}
}
else {
nerr = MPI_Recv(&response,1,MPI_INT,nv,2,0,&stat);
/* Local processor does not agree with last processor on total number */
if (response != nproc) {
fprintf(unit2,"processor number error, local/remote nproc = %d,%d\n",
nproc,response);
ierror = 7;
nerr = MPI_Finalize();
return ierror;
}
}
/* Clear unused MPI_COMM_WORLD mapping */
for (i = nproc; i < MAXS; i++) {
mapcomm[0][i] = MPI_UNDEFINED;
}
mapcomm[0][MAXS+2] = 0;
/* Set MPI_COMM_SELF */
mapcomm[1][0] = idproc;
mapcomm[1][MAXS] = 1;
mapcomm[1][MAXS+1] = 0;
mapcomm[1][MAXS+2] = 0;
/* Set descriptor array for notifier */
maxfds = -1;
for (i = 0; i < MAXS+1; i++) {
if (epref[i]) {
maxfds = imax(epref[i],maxfds);
FD_SET(epref[i],&fdsset);
}
}
maxfds = maxfds + 1;
/* Prepare signal mask */
oss = sigemptyset(&sset);
oss = sigaddset(&sset,SIGIO);
/* Prepare signal action */
act.sa_handler = notifier;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
oss = sigaction(SIGIO,&act,NULL);
if (oss < 0) {
ierror = errno;
fprintf(unit2,"Sigaction SIGIO Error = %d, %s\n",ierror,
strerror(ierror));
nerr = MPI_Finalize();
return ierror;
}
/* Set providers to asynchronous mode */
nv = 1;
nerr = getpid();
for (i = 0; i < MAXS+1; i++) {
if (epref[i]) {
oss = fcntl(epref[i],F_SETOWN,nerr);
if (oss < 0) {
oss = errno;
fprintf(unit2,"F_SETOWN fcntl Error, oss = %d, %s\n",oss,
strerror(oss));
return oss;
}
oss = ioctl(epref[i],FIOASYNC,&nv);
if (oss < 0) {
oss = errno;
fprintf(unit2,"FIOASYNC ioctl Error, oss = %d, %s\n",oss,
strerror(oss));
return oss;
}
oss = ioctl(epref[i],FIONBIO,&nv);
if (oss < 0) {
oss = errno;
fprintf(unit2,"FIONBIO ioctl Error, oss = %d, %s\n",oss,
strerror(oss));
return oss;
}
}
}
/* Create window for showing MPI message status */
if (monitor > 0) {
messwin(nproc);
checkesc(1);
if (monitor==2)
fprintf(unit2,"MPI_Init complete\n\n");
}
/* Set error code to success */
ierror = 0;
return ierror;
}
static void alarmf(int signo) {
/* callback function to handle connect/accept alarms */
return;
}
static void notifier(int signo) {
/* notifier function for asynchronous and completion events
local data */
int i, j, l, n, m;
long num, oss;
struct timeval timeout = {0,0};
fd_set lfdsset;
/* internal mpi common block
epref = array of endpoint references for each participating node
maxfds = maximum descriptor value
fdsset = fd_set reprsenting all endpoints */
/* internal common block for non-blocking messages
rwrec = read/write record for asynchronous messages
trash = trash bin for unwanted data
mqueue = message request queue */
/* Check if any descriptors are ready for reading */
lfdsset = fdsset;
num = select(maxfds,&lfdsset,NULL,NULL,&timeout);
/* Check for error in select */
if (num <= 0) {
num = 0;
goto L20;
}
l = 0;
/* Find which descriptor has a read event */
for (i = 0; i < nproc; i++) {
if (FD_ISSET(epref[i],&lfdsset)) {
/* Get reference to endpoint */
n = ioc[i][0];
/* Read pointer to current read record */
m = ioc[i][2] - 1;
/* Read data sent from a remote peer */
if ((m >= 0) && (m < MAXM)) {
/* Obtain the current time stamp */
oss = gettimeofday(&rwrec[m].ts[1],NULL);
L10: oss = recv(rwrec[m].ref,rwrec[m].buf,rwrec[m].nbytes,
rwrec[m].flags);
if (oss < 0)
oss = errno - 1024;
/* Process data which arrived */
if (oss > 0) {
/* Clear non-fatal error code */
rwrec[m].nfatal = 0;
/* Set actual length received */
rwrec[m].len += oss;
/* Check if all the data has arrived */
if (rwrec[m].len < header[m].hdata[3]) {
/* Incomplete message */
if (rwrec[m].nbytes > oss) {
/* Readjust buffer pointer */
rwrec[m].buf = (void *)(((unsigned char *)rwrec[m].buf) + oss);
rwrec[m].nbytes -= oss;
if (rwrec[m].len >= 0)
rwrec[m].ioflag += 1;
}
/* Header is received, readjust parameters to receive data */
else if (rwrec[m].ioflag==1) {
rwrec[m].buf = rwrec[m].sbuf;
rwrec[m].nbytes = imin(header[m].hdata[3],rwrec[m].sln);
rwrec[m].ioflag = 2;
}
/* Data is received and buffer is full */
else {
rwrec[m].buf = &trash;
rwrec[m].nbytes = 1024;
}
goto L10;
}
/* Message complete */
else {
/* Obtain the current time stamp */
oss = gettimeofday(&rwrec[m].ts[1],NULL);
/* Set iocompletion flag */
rwrec[m].ioflag = 0;
/* Get next message if messages are queued */
if (rwrec[m].nextm > 0) {
m = rwrec[m].nextm;
if (m==mqueue[n][0])
mqueue[n][0] = 0;
ioc[i][2] = m;
m -= 1;
goto L10;
}
/* Clear pointer to current send record */
else
ioc[i][2] = 0;
}
}
/* Check for errors */
else {
/* Check for EOF */
if (oss==0)
oss = -1;
/* Quit if no data is available */
if ((oss+1024) != EWOULDBLOCK) {
/* Set iocompletion flag to error */
rwrec[m].ioflag = oss;
ioc[i][2] = 0;
}
}
}
/* All receive events processed */
l += 1;
if (l==num)
goto L20;
}
}
/* Check if any descriptors are ready for writing */
L20: lfdsset = fdsset;
oss = select(maxfds,NULL,&lfdsset,NULL,&timeout);
if (oss > 0)
num += oss;
/* Check for error in select */
if (oss <= 0)
return;
/* Find which descriptor has a write event */
for (j = 0; j < nproc+1; j++) {
i = j;
if (j==nproc)
i = MAXS;
if (FD_ISSET(epref[i],&lfdsset)) {
/* Get reference to endpoint */
n = ioc[i][0];
/* Read pointer to current send record */
m = ioc[i][3] - 1;
/* Send data to a remote peer */
if ((m >= 0) && (m < MAXM)) {
/* Obtain the current time stamp */
oss = gettimeofday(&rwrec[m].ts[1],NULL);
L30: if (rwrec[m].ioflag==1)
oss = writev(rwrec[m].ref,rwrec[m].buf,rwrec[m].nbytes);
else
oss = send(rwrec[m].ref,rwrec[m].buf,rwrec[m].nbytes,
rwrec[m].flags);
if (oss < 0)
oss = errno - 1024;
/* Process data which has been sent */
if (oss > 0) {
/* Clear non-fatal error code */
rwrec[m].nfatal = 0;
/* Set actual length sent */
rwrec[m].len += oss;
/* Check for incomplete header */
if (rwrec[m].len < 0) {
header[m].iov[0].iov_base =
(void *)(((unsigned char *)header[m].iov[0].iov_base) + oss);
header[m].iov[0].iov_len -= oss;
goto L30;
}
/* Check for incomplete data */
else if (rwrec[m].sln > rwrec[m].len) {
/* Header is sent, readjust parameters to send data */
if (rwrec[m].ioflag==1) {
rwrec[m].buf = rwrec[m].sbuf;
rwrec[m].nbytes = rwrec[m].sln;
oss -= header[m].iov[0].iov_len;
}
/* Readjust buffer pointer */
rwrec[m].buf = (void *)(((unsigned char *)rwrec[m].buf) + oss);
rwrec[m].nbytes -= oss;
rwrec[m].ioflag += 1;
goto L30;
}
/* Data is sent */
else {
/* Obtain the current time stamp */
oss = gettimeofday(&rwrec[m].ts[1],NULL);
/* Set iocompletion flag */
rwrec[m].ioflag = 0;
/* Get next message if messages are queued */
if (rwrec[m].nextm > 0) {
m = rwrec[m].nextm;
if (m==mqueue[n][1])
mqueue[n][1] = 0;
ioc[i][3] = m;
m -= 1;
goto L30;
}
/* Clear pointer to current send record */
else
ioc[i][3] = 0;
}
}
/* Check for errors */
else {
/* Check for EOF */
if (oss==0)
oss = -1;
/* Quit if no data can be sent */
if ((oss+1024) != EWOULDBLOCK) {
/* Set iocompletion flag to error */
rwrec[m].ioflag = oss;
ioc[i][3] = 0;
}
}
}
/* All send events processed */
l += 1;
if (l==num)
return;
}
}
return;
}
long otpinit(int np, struct sockaddr_in *addrn, int alen) {
/* this subroutine initializes a Socket provider for
index np, using address specified in addrn.
provider is left in asynchronous, blocking mode
np = index to endpoint reference array
addrn = address to which endpoint is to be bound
alen = length of addrn structure
returns error indicator
input: np, addrn, alen
local data */
int i;
long oss, value;
/* internal mpi common block
epref = array of endpoint references for each participating node
ioc = array of context pointers for notifier function */
oss = 0;
/* Create a synchronous endpoint provider */
epref[np] = socket(AF_INET,SOCK_STREAM,0);
if (epref[np] < 0) {
oss = errno;
fprintf(unit2,"Socket Error = %d, %s\n",oss,strerror(oss));
return oss;
}
/* Set TCP_NODELAY option */
value = 1;
oss = setsockopt(epref[np],IPPROTO_TCP,TCP_NODELAY,&value,4);
if (oss < 0) {
oss = errno;
fprintf(unit2,"TCP_NODELAY setsockopt Error %d, %s\n",oss,strerror(oss));
return oss;
}
/* Set SO_RCVBUF option */
value = 65536;
/* oss = setsockopt(epref[np],SOL_SOCKET,SO_RCVBUF,&value,4); */
if (oss < 0) {
oss = errno;
fprintf(unit2,"SO_RCVBUF setsockopt Error %d, %s\n",oss,strerror(oss));
return oss;
}
/* Set SO_SNDBUF option */
value = 65536;
/* oss = setsockopt(epref[np],SOL_SOCKET,SO_SNDBUF,&value,4); */
if (oss < 0) {
oss = errno;
fprintf(unit2,"SO_SNDBUF setsockopt Error %d, %s\n",oss,strerror(oss));