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mplrs.c
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/* mplrs.c: initial release of MPI version
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Author: Charles Jordan skip@ist.hokudai.ac.jp
Based on plrs.cpp by Gary Roumanis
Initial lrs Author: David Avis avis@cs.mcgill.ca
*/
/* #include "lrslib.h" */ /* included in mplrs.h */
#include "mplrs.h"
#include <mpi.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>
/* global variables */
mplrsv mplrs; /* state of this process */
masterv master; /* state of the master */
consumerv consumer; /* state of the consumer */
/******************
* initialization *
******************/
int main(int argc, char **argv)
{
mplrs_init(argc, argv);
mprintf2(("%d: initialized on %s\n",mplrs.rank,mplrs.host));
if (mplrs.size<3)
return mplrs_fallback();
if (mplrs.rank == MASTER)
return mplrs_master();
else if (mplrs.rank == CONSUMER)
return mplrs_consumer();
else
return mplrs_worker();
}
void mplrs_init(int argc, char **argv)
{
int i,j;
int count;
char c;
time_t curt = time(NULL);
char *tim, *tim1;
/* make timestamp for filenames */
tim = ctime(&curt);
tim1 = tim+4;
tim1[3] = tim1[6] = '_';
tim1[15]='\0';
/* start MPI */
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &mplrs.rank);
MPI_Comm_size(MPI_COMM_WORLD, &mplrs.size);
MPI_Get_processor_name(mplrs.host, &count);
/* allocate mp for volume calculation, from plrs */
lrs_alloc_mp(mplrs.tN); lrs_alloc_mp(mplrs.tD);
lrs_alloc_mp(mplrs.Vnum); lrs_alloc_mp(mplrs.Vden);
lrs_alloc_mp(mplrs.Tnum); lrs_alloc_mp(mplrs.Tden);
itomp(ZERO, mplrs.Vnum); itomp(ONE, mplrs.Vden);
gettimeofday(&mplrs.start, NULL);
mplrs_initstrucs(); /* initialize default values of globals */
/* process commandline arguments, set input and output files */
mplrs_commandline(argc, argv);
if (mplrs.rank == MASTER || mplrs.rank == CONSUMER)
{
/* open input file for reading on master, open output file for
* writing on consumer, open histogram file for writing on
* master -- if these files are to be used.
*/
mplrs_initfiles();
if (mplrs.rank == MASTER)
master_sendfile();
}
else
{
/* receive input file from master */
MPI_Recv(&count, 1, MPI_INT, 0, 20, MPI_COMM_WORLD,
MPI_STATUS_IGNORE);
mplrs.input = (char *)malloc(sizeof(char)*(count+1));
MPI_Recv(mplrs.input, count, MPI_CHAR, 0, 20,
MPI_COMM_WORLD, MPI_STATUS_IGNORE);
mplrs.input[count] = '\0';
/* get number of chars needed for worker files */
j = mplrs.size;
for (i=1; j>9; i++)
j = j/10;
i += 6+strlen(tim1); /* mplrs_TIMESTAMP */
i += strlen(mplrs.tfn_prefix) + strlen(mplrs.input_filename) +
i + 6; /* _%d.ine\0 */
mplrs.tfn = (char *)malloc(sizeof(char) * i);
sprintf(mplrs.tfn, "%smplrs_%s%s_%d.ine",
mplrs.tfn_prefix, tim1,
mplrs.input_filename,
mplrs.rank);
/* flatten directory structure in mplrs.input_filename
* for mplrs.tfn, to prevent writing to non-existent
* subdirectories in e.g. /tmp
*/
i = strlen(mplrs.tfn_prefix) + 6 + strlen(tim1);
j = strlen(mplrs.tfn);
for (; i<j; i++)
{
c = mplrs.tfn[i];
if (c == '/' || c == '\\')
mplrs.tfn[i] = '_';
}
}
/* setup signals --
* TERM checkpoint to checkpoint file, or output file if none & exit
* HUP ditto
*/
signal(SIGTERM, mplrs_caughtsig);
signal(SIGHUP, mplrs_caughtsig);
}
/* if we catch a signal, set a flag to exit */
void mplrs_caughtsig(int sig)
{
if (mplrs.caughtsig<2)
mplrs.caughtsig = 1;
signal(sig, mplrs_caughtsig);
return;
}
/* if we've caught a signal, tell the master about it */
void mplrs_handlesigs(void)
{
float junk = 0; /* 0: caught a signal */
if (mplrs.caughtsig != 1)
return;
/* we want to stop, so no need to hurry and queue the send */
MPI_Send(&junk, 1, MPI_FLOAT, MASTER, 9, MPI_COMM_WORLD);
mplrs.caughtsig = 2; /* handled */
return;
}
/* signal the master that we want to stop,
* can try to checkpoint. Use mplrs to give
* output if desired.
* Does not return to caller ... ugly
*/
void mplrs_cleanstop(int checkpoint)
{
MPI_Request req = MPI_REQUEST_NULL;
char *cobasis = NULL;
float junk;
int header[8]={0};
int flag = 0, len;
unsigned long ncob = 0;
mprintf(("%d: in cleanstop\n", mplrs.rank));
if (checkpoint)
junk = 1;
else
junk = -1;
/* inform master, wait for reply */
MPI_Send(&junk, 1, MPI_FLOAT, MASTER, 9, MPI_COMM_WORLD);
MPI_Recv(&junk, 1, MPI_FLOAT,MASTER,9,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
/* needs to do usual cleanup / exit of a worker. callstack is
* unpredictable though, so exit() and don't return.
*/
/* leaks: starting_cobasis (mplrs_worker)
*/
/* do_work cleanup*/
remove(mplrs.tfn); /* delete temporary file */
/* mplrs_worker cleanup */
mplrs.outputblock = 0;
process_output();
return_unfinished_cobases();
clean_outgoing_buffers();
/* mplrs_worker start of loop ... */
MPI_Isend(&ncob, 1, MPI_UNSIGNED, MASTER, 6, MPI_COMM_WORLD, &req);
while (1)
{
MPI_Test(&req, &flag, MPI_STATUS_IGNORE);
if (flag)
{
mprintf3(("%d: clean_stop incoming message from 0\n",
mplrs.rank));
MPI_Recv(header, 8, MPI_INT, MASTER, MPI_ANY_TAG,
MPI_COMM_WORLD, MPI_STATUS_IGNORE);
if (header[0] == -1) /* no more work to do */
{
mplrs_worker_finished();
exit(0);
}
else /* forget this cobasis */
{
len = header[0];
cobasis = (char *)malloc(sizeof(char)*(len+1));
MPI_Recv(cobasis, len, MPI_CHAR, MASTER,
MPI_ANY_TAG, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
cobasis[len] = '\0';
mprintf3(("%d: got %s, throwing away\n",
mplrs.rank, cobasis));
free(cobasis);
return_unfinished_cobases();
clean_outgoing_buffers();
MPI_Isend(&ncob, 1, MPI_UNSIGNED, MASTER, 6,
MPI_COMM_WORLD, &req);
}
}
clean_outgoing_buffers();
}
/* mplrs_worker */
}
/* terminate immediately and ungracefully after printing the string */
void mplrs_emergencystop(const char *msg)
{
int ret;
fprintf(stderr, "%s",msg);
ret = MPI_Abort(MPI_COMM_WORLD, 1);
exit(ret);
}
/* send the contents of the input file to all workers */
void master_sendfile(void)
{
char *buf;
int count=0;
int c, i;
c = fgetc(master.input);
while (c!=EOF)
{
count++;
c = fgetc(master.input);
}
buf = (char *)malloc(sizeof(char)*(count));
fseek(master.input, 0, SEEK_SET);
for (i=0; i<count; i++)
{
c = fgetc(master.input);
buf[i]=c;
}
for (i=0; i<mplrs.size; i++)
{
if (i==MASTER || i==CONSUMER)
continue;
mprintf2(("M: Sending input file to %d\n", i));
MPI_Send(&count, 1, MPI_INT, i, 20, MPI_COMM_WORLD);
MPI_Send(buf, count, MPI_CHAR, i, 20, MPI_COMM_WORLD);
}
fseek(master.input, 0, SEEK_SET);
free(buf);
}
/* initialize default values of global structures, before commandline */
void mplrs_initstrucs(void)
{
mplrs.cobasis_list = NULL;
mplrs.caughtsig = 0;
mplrs.overflow = 0;
mplrs.rays = 0;
mplrs.vertices = 0;
mplrs.bases = 0;
mplrs.facets = 0;
mplrs.linearities = 0;
mplrs.intvertices = 0;
mplrs.deepest = 0;
mplrs.my_tag = 100;
mplrs.tfn_prefix = DEF_TEMP;
mplrs.tfn = NULL;
mplrs.tfile = NULL;
mplrs.input_filename = DEF_INPUT;
mplrs.input = NULL;
mplrs.output_list = NULL;
mplrs.ol_tail = NULL;
mplrs.outnum = 0;
mplrs.maxbuf = DEF_MAXBUF; /* maximum # lines to buffer */
mplrs.outputblock = 0; /* don't block initial output */
mplrs.countonly = 0;
master.cobasis_list = NULL;
master.size_L = 0;
master.tot_L = 0;
master.num_empty = 0;
master.num_producers = 0;
master.checkpointing = 0;
master.cleanstop = 0;
master.lmin = DEF_LMIN;
master.lmax = DEF_LMAX;
master.scalec = DEF_SCALEC;
master.initdepth = DEF_ID;
master.maxdepth = DEF_MAXD;
master.maxcobases = DEF_MAXC;
master.maxncob = DEF_MAXNCOB;
master.lponly = 0;
master.time_limit = 0;
master.hist_filename = DEF_HIST;
master.hist = NULL;
master.doing_histogram = 0;
master.freq_filename = DEF_FREQ;
master.freq = NULL;
master.restart_filename = DEF_RESTART;
master.restart = NULL;
master.checkp_filename = DEF_CHECKP;
master.checkp = NULL;
master.stop_filename = DEF_STOP;
master.stop = NULL;
master.input = NULL;
consumer.prodreq = NULL;
consumer.prodibf = NULL;
consumer.incoming = NULL;
consumer.output_filename = DEF_OUTPUT;
consumer.output = stdout;
consumer.oflow_flag = 0;
consumer.num_producers = 0;
consumer.waiting_initial = 1;
consumer.final_print = 1;
}
/* process commandline arguments */
void mplrs_commandline(int argc, char **argv)
{
int i, arg, firstfile=1;
for (i=1; i<argc; i++)
{
if (!strcmp(argv[i], "-lmin"))
{
arg = atoi(argv[i+1]);
i++;
if (arg < 1 )
bad_args();
master.lmin = arg;
if (master.lmin > master.lmax)
master.lmax = arg;
continue;
}
else if (!strcmp(argv[i], "-lmax"))
{
arg = atoi(argv[i+1]);
i++;
if (arg<1 )
bad_args();
master.lmax = arg;
if (master.lmin > master.lmax)
master.lmin = arg;
continue;
}
else if (!strcmp(argv[i], "-scale"))
{
arg = atoi(argv[i+1]);
i++;
if (arg<1)
bad_args();
master.scalec = arg;
continue;
}
else if (!strcmp(argv[i], "-hist"))
{
master.hist_filename = argv[i+1];
i++;
continue;
}
else if (!strcmp(argv[i], "-freq"))
{
master.freq_filename = argv[i+1];
i++;
continue;
}
else if (!strcmp(argv[i], "-stopafter"))
{
arg = atoi(argv[i+1]);
i++;
if (arg<1)
bad_args();
master.maxncob = arg;
continue;
}
else if (!strcmp(argv[i], "-countonly"))
{
mplrs.countonly = 1;
continue;
}
else if (!strcmp(argv[i], "-maxbuf"))
{
arg = atoi(argv[i+1]);
i++;
if (arg<1)
bad_args();
mplrs.maxbuf = arg;
continue;
}
else if (!strcmp(argv[i], "-id"))
{
arg = atoi(argv[i+1]);
i++;
if (arg<0)
bad_args();
master.initdepth = arg;
continue;
}
else if (!strcmp(argv[i], "-maxd"))
{
arg = atoi(argv[i+1]);
i++;
if (arg<1)
bad_args();
master.maxdepth = arg;
continue;
}
else if (!strcmp(argv[i], "-maxc"))
{
arg = atoi(argv[i+1]);
i++;
if (arg<0)
bad_args();
master.maxcobases = arg;
continue;
}
else if (!strcmp(argv[i], "-checkp"))
{
master.checkp_filename = argv[i+1];
i++;
continue;
}
else if (!strcmp(argv[i], "-lponly"))
{
master.lponly = 1;
continue;
}
else if (!strcmp(argv[i], "-stop"))
{
master.stop_filename = argv[i+1];
i++;
continue;
}
else if (!strcmp(argv[i], "-time"))
{
arg = atoi(argv[i+1]);
i++;
if (arg<1)
bad_args();
master.time_limit = arg;
continue;
}
else if (!strcmp(argv[i], "-restart"))
{
master.restart_filename = argv[i+1];
i++;
continue;
}
else if (!strcmp(argv[i], "-temp"))
{
mplrs.tfn_prefix = argv[i+1];
i++;
continue;
}
else if (firstfile == 1)
{
mplrs.input_filename = argv[i];
firstfile = 2;
}
else if (firstfile == 2)
{
consumer.output_filename = argv[i];
firstfile = 3;
}
else
bad_args();
}
if (master.lmax == -1)
master.lmax = (master.lmin>0? master.lmin: 0);
if (mplrs.input_filename==NULL) /* need an input file */
bad_args();
if ((master.stop_filename!=NULL || master.time_limit!=0) &&
master.checkp_filename==NULL)
bad_args(); /* need checkpoint file if stop condition given */
}
/* open input file on master, histogram (if exists) on master,
* output (if exists) on consumer
*/
void mplrs_initfiles(void)
{
if (mplrs.rank == MASTER)
{
master.input = fopen(mplrs.input_filename, "r");
if (master.input == NULL)
{
printf("Unable to open %s for reading [%s].\n",
mplrs.input_filename, mplrs.host);
/* MPI_Finalize(); */
exit(0);
}
if (master.hist_filename != NULL)
{
master.hist = fopen(master.hist_filename, "w");
if (master.hist == NULL)
{
printf("Unable to open %s for writing [%s].\n",
master.hist_filename, mplrs.host);
/* MPI_Finalize(); */
exit(0);
}
master.doing_histogram = 1;
mprintf2(("M: Prepared histogram (%s)\n", master.hist_filename));
}
if (master.freq_filename != NULL)
{
master.freq = fopen(master.freq_filename, "w");
if (master.freq == NULL)
{
printf("Unable to open %s for writing [%s].\n",
master.freq_filename, mplrs.host);
exit(0);
}
mprintf2(("M: Prepared frequency file (%s)\n",
master.freq_filename));
}
if (master.checkp_filename !=NULL)
{
master.checkp = fopen(master.checkp_filename, "w");
if (master.checkp == NULL)
{
printf("Unable to open %s for writing [%s].\n",
master.checkp_filename, mplrs.host);
/* MPI_Finalize(); */
exit(0);
}
mprintf2(("M: Prepared checkpoint file (%s)\n",
master.checkp_filename));
}
if (master.restart_filename != NULL)
{
master.restart = fopen(master.restart_filename, "r");
if (master.restart == NULL)
{
printf("Unable to open %s for reading [%s].\n",
master.restart_filename, mplrs.host);
/* MPI_Finalize(); */
exit(0);
}
mprintf2(("M: Opened restart file (%s)\n",
master.restart_filename));
}
}
if (mplrs.rank == CONSUMER)
{
if (consumer.output_filename == NULL)
return;
consumer.output = fopen(consumer.output_filename, "w");
if (consumer.output == NULL)
{
printf("Unable to open %s for writing [%s].\n",
consumer.output_filename, mplrs.host);
/* MPI_Finalize(); */
exit(0);
}
}
}
/* Bad commandline arguments. Complain and die. */
void bad_args(void)
{
if (mplrs.rank == CONSUMER)
printf("Invalid arguments.\n%s\n", USAGE);
MPI_Finalize();
exit(0);
}
/* fallback -- meaningless if <3 processes
* better would be to fallback to normal lrs if <4 processes
*/
int mplrs_fallback(void)
{
if (mplrs.rank==0)
printf("mplrs requires at least 3 processes.\n");
MPI_Finalize();
exit(0);
return 0; /* unreachable */
}
/**********
* master *
**********/
int mplrs_master(void)
{
int i;
int loopiter = 0; /* do some things only sometimes */
MPI_Request ign = MPI_REQUEST_NULL; /* a request we'll ignore */
struct timeval cur, last; /* for histograms */
int flag = 0;;
int phase = 1; /* In phase1? */
int done = -1; /* need a negative int to send to finished workers */
int ncob=0; /* for printing sizes of sub-problems and for -stopafter*/
unsigned long tot_ncob = 0;
int want_stop = 0;
int check = 0; /* inform consumer whether checkpointing */
gettimeofday(&last, NULL);
master.num_producers = 0; /* nobody working right now */
master.act_producers = (unsigned int *)malloc(sizeof(unsigned int)*mplrs.size);
master.live_workers = mplrs.size - 2;
master.workin = (int *)malloc(sizeof(int)*mplrs.size);
master.mworkers = (MPI_Request *)malloc(sizeof(MPI_Request)*mplrs.size);
master.incoming = NULL;
master.sigbuf = (float*)malloc(sizeof(float)*mplrs.size);
master.sigcheck = (MPI_Request *)malloc(sizeof(MPI_Request)*mplrs.size);
if (master.restart!=NULL)
{
master_restart();
phase = 0;
}
for (i=0; i<mplrs.size; i++)
{
master.act_producers[i] = 0;
if (i==MASTER)
continue;
MPI_Irecv(master.sigbuf+i, 1, MPI_FLOAT, i, 9, MPI_COMM_WORLD,
master.sigcheck+i);
if (i==CONSUMER)
continue;
MPI_Irecv(master.workin+i, 1, MPI_UNSIGNED, i, 6, MPI_COMM_WORLD,
master.mworkers+i);
}
while ((master.cobasis_list!=NULL && !master.checkpointing && !want_stop) || master.num_producers>0 || master.live_workers>0)
{
loopiter++;
/* sometimes check if we should update histogram etc */
if (!(loopiter&0x1ff))
{
if (master.maxncob>0 && master.maxncob<=tot_ncob)
want_stop = 1;
if (master.doing_histogram)
print_histogram(&cur, &last);
}
/* sometimes check if we should checkpoint */
if (!(loopiter&0x7ff))
// && !master.checkpointing && !master.cleanstop)
{
if (master.stop_filename!=NULL || master.time_limit!=0)
check_stop();
master_checksigs();
if (master.cleanstop)
want_stop = 1;
}
recv_producer_lists();
/* check if anyone wants work */
for (i=0; i<mplrs.size; i++)
{ /* consumer and master don't want work */
if (i==CONSUMER || i==MASTER)
continue;
/* workers that have exited can't work */
if (master.mworkers[i]==MPI_REQUEST_NULL)
continue;
if (master.num_producers>0 && master.cobasis_list==NULL)
{
break; /* no work to give now, but some may
* appear later
*/
}
if (phase==1 && i!=INITIAL)
continue; /* INITIAL gets the first bit */
MPI_Test(master.mworkers+i, &flag, MPI_STATUS_IGNORE);
if (!flag)
continue; /* i is not ready for more work */
ncob = master.workin[i];
tot_ncob+=ncob;
mprintf2(("M: %d looking for work\n", i));
if ((master.cobasis_list!=NULL || phase==1) &&
!master.checkpointing && !want_stop)
{ /* and not checkpointing! */
send_work(i,phase);
MPI_Irecv(master.workin+i, 1, MPI_UNSIGNED,i, 6,
MPI_COMM_WORLD, master.mworkers+i);
phase=0;
if (master.freq!=NULL && ncob>0)
fprintf(master.freq, "%d\n", ncob);
continue;
}
/* else tell worker we've finished */
mprintf(("M: Saying goodbye to %d, %d left\n", i,
master.live_workers-1));
MPI_Isend(&done, 1, MPI_INT, i, 8, MPI_COMM_WORLD,&ign);
MPI_Request_free(&ign);
master.live_workers--;
if (master.freq!=NULL && ncob>0)
fprintf(master.freq, "%d\n", ncob);
}
clean_outgoing_buffers();
}
/* don't checkpoint if we actually finished the run */
if (master.checkpointing && master.cobasis_list==NULL)
master.checkpointing = 0;
if (master.checkpointing) /* checkpointing */
check = CHECKFLAG;
/* inform consumer if checkpointing or not */
mprintf2(("M: Telling consumer whether or not checkpointing (%d)\n", check));
MPI_Send(&check, 1, MPI_INT, CONSUMER, 1, MPI_COMM_WORLD);
if (master.checkpointing)
master_checkpoint();
send_master_stats();
MPI_Finalize();
free(master.workin);
free(master.mworkers);
free(master.act_producers);
free(master.sigbuf);
free(master.sigcheck);
return 0;
}
/* prepare to receive remaining cobases from target.
* Since we don't yet know the size of buffers needed, we
* only Irecv the header and will Irecv the actual cobases later
*/
void master_add_incoming(int target)
{
msgbuf *msg = (msgbuf *)malloc(sizeof(msgbuf));
msg->req = (MPI_Request *)malloc(sizeof(MPI_Request)*3);
msg->buf = (void **)malloc(sizeof(void *)*3);
msg->buf[0] = (int *)malloc(sizeof(int) * 3); /* (strlen,lengths,tag) */
msg->buf[1] = NULL; /* sizes not known yet */
msg->buf[2] = NULL;
msg->count = 3;
msg->target = target;
msg->queue = 1;
msg->tags = NULL;
msg->sizes = NULL;
msg->types = NULL;
msg->next = master.incoming;
master.incoming = msg;
MPI_Irecv(msg->buf[0], 3, MPI_INT, target, 10, MPI_COMM_WORLD,msg->req); return;
}
/* check our list of incoming messages from producers about cobases
* to add to L. Add any from messages that have completed.
* If the header has completed (msg->queue==1 and header completed),
* add the remaining MPI_Irecv's.
* Update num_producers to keep track of how many messages the master
* is owed (workers are not allowed to exit until num_producers==0 and
* L is empty).
* Also update size_L
*/
void recv_producer_lists(void)
{
msgbuf *msg, *prev=NULL, *next;
int *header;
int flag;
for (msg = master.incoming; msg; msg=next)
{
next = msg->next;
MPI_Test(msg->req, &flag, MPI_STATUS_IGNORE);
if (!flag) /* header has not completed yet */
{
prev = msg;
continue;
}
header = (int *)msg->buf[0];
if (msg->queue) /* header completed, and need to Irecv now */
{
if (header[0]==-1) /* producer returns NOTHING */
{
master.num_producers--;
master.act_producers[msg->target]--;
free_msgbuf(msg);
if (prev)
prev->next = next;
else
master.incoming = next;
continue;
}
msg->buf[1]= (char*)malloc(sizeof(char)*header[1]);
msg->buf[2]= (int *)malloc(sizeof(int)*header[0]);
MPI_Irecv(msg->buf[1], header[1], MPI_CHAR, msg->target,
header[2], MPI_COMM_WORLD, msg->req+1);
MPI_Irecv(msg->buf[2], header[0], MPI_INT, msg->target,
header[2], MPI_COMM_WORLD, msg->req+2);
msg->queue=0;
prev = msg;
continue;
}
/* header completed, did the rest? */
MPI_Testall(2, msg->req+1, &flag, MPI_STATUSES_IGNORE);
if (!flag) /* not yet */
{
prev = msg;
continue;
}
mprintf2(("M: %d returned non-empty producer list (%d, %d)\n",
msg->target, header[0], header[1]));
process_returned_cobases(msg);
mprintf2(("M: Now have size_L=%lu\n",master.size_L));
if (prev)
prev->next = next;
else
master.incoming = next;
master.num_producers--;
master.act_producers[msg->target]--;
free_msgbuf(msg);
}
return;
}
/* msg is a completed, non-empty buffer containing cobases to add to
* L. Process it, add them to L, and update size_L
* Basically the inverse of return_unfinished_cobases()
*/
void process_returned_cobases(msgbuf *msg)
{
int *header = (int *)msg->buf[0];
char *str = (char *)msg->buf[1];
int *lengths = (int *)msg->buf[2];
int i;
char *cob;
for (i=0; i<header[0]; i++)
{
cob = (char *)malloc(sizeof(char)*(lengths[i]+1));
strncpy(cob, str, lengths[i]);
cob[lengths[i]] = '\0';
str+=lengths[i];
mprintf2(("M: Adding to L: %s\n",cob));
master.cobasis_list = addlist(master.cobasis_list, cob);
}
master.size_L += header[0];
master.tot_L += header[0];
return;
}
/* send one unit from L to target. if phase!=0, this is the first
* unit we're sending (i.e. phase 1). usually, phase==0.
* Parameters are scaled and sent in the header.
*/
void send_work(int target, int phase)
{
slist *cob;
msgbuf *msg = (msgbuf *)malloc(sizeof(msgbuf));
int *header;
msg->req = (MPI_Request *)malloc(sizeof(MPI_Request)*2);
msg->buf = (void **)malloc(sizeof(void *)*2);
/*{length of work string, int maxdepth, int maxcobases, bool lponly,
4x future use} */
msg->buf[0] = (int *)malloc(sizeof(int) * 8);
header = (int *)msg->buf[0];
if (phase==0) /* normal */
{
cob = master.cobasis_list;
master.cobasis_list = cob->next;
header[0] = strlen((char *)cob->data);
msg->buf[1] = cob->data;
setparams(header); /* scale if needed */
master.size_L--;
if (master.size_L == 0)
master.num_empty++;
mprintf(("M: Sending work to %d (%d,%d,%d) %s\n",
target, header[0], header[1], header[2],
(char*)msg->buf[1]));
msg->count = 2;
free(cob);
}
else /* phase 1 */
{
header[0] = 0; /* header[0]==0 means initial phase 1 */
header[1] = master.initdepth;
header[2] = master.maxcobases;
mprintf(("M: Sending phase 1 to %d (%d,%d)\n", target,
header[1], header[2]));
msg->buf[1] = NULL;
msg->count = 1;
}
msg->target = target;
msg->queue = 0;
msg->tags = NULL;
msg->sizes = NULL;
msg->types = NULL;
/* ready to send */
MPI_Isend(header, 8, MPI_INT, target, 1, MPI_COMM_WORLD, msg->req);
if (phase==0)
MPI_Isend(msg->buf[1], header[0], MPI_CHAR, target, 1,
MPI_COMM_WORLD, msg->req+1);
master_add_incoming(target); /* prepare to receive remaining cobases */
msg->next = mplrs.outgoing;
mplrs.outgoing = msg;
master.act_producers[target]++;
master.num_producers++;
return;
}
/* header is a work header (length, maxd, maxc) not yet set.
* Set the parameters (maxd, maxc) as desired.
*/
void setparams(int *header)
{
/* if L is too small, use maxdepth */
if (master.lmin>0 && (master.size_L < mplrs.size*master.lmin))
header[1] = master.maxdepth;
else /* don't have too small L, so no maxdepth */
header[1] = 0;
header[2] = master.maxcobases;
if (master.lmax>0 && (master.size_L > mplrs.size * master.lmax))
header[2] = header[2] * master.scalec;
header[3] = master.lponly;
}
/* check if we want to stop now.
* if master.stop_filename exists or time limit exceeded,
* set master.checkpointing = 1.
* this is not an immediate stop -- we wait for current workers to
* complete the tasks they've been assigned, stopping after that.
*/
void check_stop(void)
{
struct timeval cur;
int flag = 0;
if (master.checkpointing || master.cleanstop)
return; /* already stopping */
if (master.stop_filename)
{
mprintf2(("M: checking stop file %s\n", master.stop_filename));
master.stop = fopen(master.stop_filename, "r");
if (master.stop!=NULL)
{
flag=1;
fclose(master.stop);
}
}
if (master.time_limit!=0)
{
mprintf2(("M: checking if time exceeded\n"));
gettimeofday(&cur, NULL);
if (cur.tv_sec - mplrs.start.tv_sec > master.time_limit)
flag=1;
}
if (flag!=0)
{
mprintf(("M: Stop condition detected, checkpointing!\n"));
master.checkpointing = 1;
}
}