* GNU General Public License for more details.
*/
+#define _GNU_SOURCE
+
+#include <publib.h>
+
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <inttypes.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/uio.h>
+#include <sys/fcntl.h>
-#include <publib.h>
#include <glpk.h>
/*
static unsigned printcounter;
-static int ncpus = 1;
+static void iterate(void);
+static void iterate_recurse(int i, AdjWord min);
+static bool preconsider_ok(int nwords, bool doprint);
+static bool maxhamweight_ok(void);
+static void optimise(bool doprint);
+
+static void progress_eol(void) {
+ fprintf(stderr," \r");
+ fflush(stderr);
+}
+
+static void set_best(double new_best) {
+ best = new_best;
+}
+
+/*----- multicore support -----*/
+
+/*
+ * Multicore protocol
+ *
+ * We fork into:
+ * - master (parent)
+ * - generator
+ * - ncpu workers
+ *
+ * ipc facilities:
+ * - one pipe ("work") from generator to workers
+ * - ever-extending file ("bus") containing new "best" values
+ * - one file for each worker giving maxhamweight and adjmatrix for best
+ *
+ * generator runs iterate_recurse to a certain depth and writes the
+ * candidates to a pipe
+ *
+ * workers read candidates from the pipe and resume iterate_recurse
+ * halfway through the recursion
+ *
+ * whenever a worker does a doprint, it checks the bus for new best
+ * value; actual best values are appended
+ *
+ * master waits for generator and all workers to finish and then
+ * runs optimise() for each worker's best, then prints
+ */
+
+static int ncpus = 0, multicore_iteration_boundary = INT_MAX;
+
+static int mc_bus, mc_work[2];
+static off_t mc_bus_read;
+
+typedef struct {
+ int w;
+ FILE *results;
+ pid_t pid;
+} Worker;
+static Worker *mc_us;
+
+static void multicore_check_for_new_best(void);
+
+#define MAX_NIOVS 3
+static AdjWord mc_iter_min;
+static int mc_niovs;
+static size_t mc_iovlen;
+static struct iovec mc_iov[MAX_NIOVS];
+
+#define IOV0 (mc_niovs = mc_iovlen = 0)
+
+#define IOV(obj, count) ({ \
+ assert(mc_niovs < MAX_NIOVS); \
+ mc_iov[mc_niovs].iov_base = &(obj); \
+ mc_iov[mc_niovs].iov_len = sizeof(obj) * (count); \
+ mc_iovlen += mc_iov[mc_niovs].iov_len; \
+ mc_niovs++; \
+ })
+
+static void mc_rwvsetup_outer(void) {
+ IOV0;
+ IOV(maxhamweight, 1);
+ IOV(mc_iter_min, 1);
+ IOV(*adjmatrix, multicore_iteration_boundary);
+}
+
+static void mc_rwvsetup_full(void) {
+ IOV0;
+ IOV(*adjmatrix, n);
+}
+
+static void vlprintf(const char *fmt, va_list al) {
+ vfprintf(stderr,fmt,al);
+ progress_eol();
+}
+
+static void LPRINTF(const char *fmt, ...) {
+ va_list al;
+ va_start(al,fmt);
+ vlprintf(fmt,al);
+ va_end(al);
+}
+
+static void mc_awaitpid(int wnum, pid_t pid) {
+ LPRINTF("master awaiting %2d [%ld]",wnum,(long)pid);
+ int status;
+ pid_t got = waitpid(pid, &status, 0);
+ assert(got == pid);
+ if (status) {
+ fprintf(stderr,"\nFAILED SUBPROC %2d [%ld] %d\n",
+ wnum, (long)pid, status);
+ exit(-1);
+ }
+}
+
+static void multicore_outer_iteration(int i, AdjWord min) {
+ static unsigned check_counter;
+
+ assert(i == multicore_iteration_boundary);
+ mc_iter_min = min;
+ mc_rwvsetup_outer();
+ ssize_t r = writev(mc_work[1], mc_iov, mc_niovs);
+ assert(r == mc_iovlen);
+ /* effectively, this writev arranges to transfers control
+ * to some worker's instance of iterate_recurse via mc_iterate_worker */
+
+ if (!(check_counter++ & 0xff))
+ multicore_check_for_new_best();
+}
+
+static void mc_iterate_worker(void) {
+ for (;;) {
+ mc_rwvsetup_outer();
+ ssize_t r = readv(mc_work[0], mc_iov, mc_niovs);
+ if (r == 0) break;
+ assert(r == mc_iovlen);
+
+ bool ok = maxhamweight_ok();
+ if (!ok) continue;
+
+ ok = preconsider_ok(multicore_iteration_boundary, 1);
+ progress_eol();
+ if (!ok) continue;
+
+ /* stop iterate_recurse from trying to run multicore_outer_iteration */
+ int mc_org_it_bound = multicore_iteration_boundary;
+ multicore_iteration_boundary = INT_MAX;
+ iterate_recurse(mc_org_it_bound, mc_iter_min);
+ multicore_iteration_boundary = mc_org_it_bound;
+ }
+ LPRINTF("worker %2d reporting",mc_us->w);
+ if (best_adjmatrix) {
+ adjmatrix = best_adjmatrix;
+ mc_rwvsetup_full();
+ ssize_t r = writev(fileno(mc_us->results), mc_iov, mc_niovs);
+ assert(r == mc_iovlen);
+ }
+ LPRINTF("worker %2d ending",mc_us->w);
+ exit(0);
+}
+
+static void multicore(void) {
+ Worker *mc_workers;
+ int w;
+ pid_t genpid;
+
+ multicore_iteration_boundary = n / 2;
+
+ FILE *busf = tmpfile(); assert(busf);
+ mc_bus = fileno(busf);
+ int r = fcntl(mc_bus, F_GETFL); assert(r >= 0);
+ r |= O_APPEND;
+ r = fcntl(mc_bus, F_SETFL, r); assert(r >= 0);
+
+ r = pipe(mc_work); assert(!r);
+
+ mc_workers = xmalloc(sizeof(*mc_workers) * ncpus);
+ for (w=0; w<ncpus; w++) {
+ mc_workers[w].w = w;
+ mc_workers[w].results = tmpfile(); assert(mc_workers[w].results);
+ mc_workers[w].pid = fork(); assert(mc_workers[w].pid >= 0);
+ if (!mc_workers[w].pid) {
+ mc_us = &mc_workers[w];
+ close(mc_work[1]);
+ LPRINTF("worker %2d running", w);
+ mc_iterate_worker();
+ exit(0);
+ }
+ }
+
+ close(mc_work[0]);
+
+ genpid = fork(); assert(genpid >= 0);
+ if (!genpid) {
+ LPRINTF("generator running");
+ iterate();
+ exit(0);
+ }
+
+ close(mc_work[1]);
+ mc_awaitpid(-1, genpid);
+ for (w=0; w<ncpus; w++)
+ mc_awaitpid(w, mc_workers[w].pid);
+
+ for (w=0; w<ncpus; w++) {
+ mc_rwvsetup_full();
+ LPRINTF("reading report from %2d",w);
+ ssize_t sr = preadv(fileno(mc_workers[w].results), mc_iov, mc_niovs, 0);
+ if (!sr) continue;
+ maxhamweight = 0;
+ optimise(1);
+ }
+}
+
+static void multicore_check_for_new_best(void) {
+ if (!ncpus) return;
+
+ for (;;) {
+ double msg;
+ ssize_t got = pread(mc_bus, &msg, sizeof(msg), mc_bus_read);
+ if (!got) break;
+ assert(got == sizeof(msg));
+ if (msg > best)
+ set_best(msg);
+ mc_bus_read += sizeof(msg);
+ }
+}
+
+static void multicore_found_new_best(void) {
+ if (!ncpus) return;
+
+ if (mc_us /* might be master */) fprintf(stderr," w%-2d ",mc_us->w);
+ ssize_t wrote = write(mc_bus, &best, sizeof(best));
+ assert(wrote == sizeof(best));
+}
+
+/*----- end of multicore support -----*/
static AdjWord *xalloc_adjmatrix(void) {
return xmalloc(sizeof(*adjmatrix)*n);
adjall = ~((~(AdjWord)0) << m);
adjmatrix = xalloc_adjmatrix();
glp_term_out(GLP_OFF);
+ setlinebuf(stderr);
}
static AdjWord one_adj_bit(int bitnum) {
static int totalfrags;
+static bool maxhamweight_ok(void) {
+ double maxminsize = (double)m / maxhamweight;
+ return maxminsize > best;
+}
+
static bool preconsider_ok(int nwords, bool doprint) {
int i;
HAVE_PRINTED;
- best = got;
+ set_best(got);
+ multicore_found_new_best();
if (best_prob) glp_delete_prob(best_prob);
best_prob = prob;
out:
if (prob)
glp_delete_prob(prob);
- if (doprint) { PRINTF(" \r"); fflush(stdout); }
+ if (doprint) progress_eol();
+ if (doprint) multicore_check_for_new_best();
}
static void iterate_recurse(int i, AdjWord min) {
optimise(!(printcounter & 0xfff));
return;
}
+ if (i >= multicore_iteration_boundary) {
+ multicore_outer_iteration(i, min);
+ return;
+ }
for (adjmatrix[i] = min;
;
adjmatrix[i]++) {
static void iterate(void) {
for (maxhamweight=1; maxhamweight<=m; maxhamweight++) {
- double maxminsize = (double)m / maxhamweight;
- if (maxminsize <= best)
+ if (!maxhamweight_ok())
continue;
iterate_recurse(0, 1);
m = atoi(argv[2]);
prep();
- iterate();
+
+ if (ncpus) multicore();
+ else iterate();
+
report();
return 0;
}
~ianmdlvl / matchsticks-search.git / blobdiff