cdo/sudoku-solver
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Run 8 solving threads in parallel

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Camden Dixie O'Brien 2022-11-25 00:13:19 +00:00
parent 516c9f5f55
commit 98a99ac340
2 changed files with 40 additions and 8 deletions
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6
Makefile
View File

@ -22,12 +22,16 @@ CFLAGS += -D_XOPEN_SOURCE=700
CFLAGS += -march=native
CFLAGS += -static
LDFLAGS += -lpthread
# For profiling
# CFLAGS += -pg
SRC = main.c sud.c solve.c
OBJ = $(SRC:.c=.o)
default: sudoku eval
sudoku: $(OBJ)
$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ) -o $@
@ -55,4 +59,4 @@ run: sudoku eval puzzles solns results
time ./sudoku
./eval
.PHONY: clean run
.PHONY: default clean run

42
main.c
View File

@ -21,6 +21,7 @@
#include "sud.h"
#include <fcntl.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
@ -31,6 +32,29 @@
#define OFNAME "results"
#define FSIZE (NPUZZ * NCELLS)
#define NTHREADS 8U
#define PUZZPT (NPUZZ / NTHREADS)
#define CELLPT (PUZZPT * NCELLS)
static char *ibuf;
static char *obuf;
void *threadproc(void *arg)
{
unsigned start = CELLPT * (uintptr_t)arg;
const char *libuf = ibuf + start;
char *lobuf = obuf + start;
struct sudoku sud;
for (unsigned o = 0; o < CELLPT; o += NCELLS) {
load(&sud, libuf + o);
solve(&sud);
save(&sud, lobuf + o);
}
return NULL;
}
int main(void)
{
int fd;
@ -40,7 +64,7 @@ int main(void)
fputs("Failed to open puzzles file\n", stderr);
return EXIT_FAILURE;
}
char *ibuf = mmap(NULL, FSIZE, PROT_READ, MAP_PRIVATE, fd, 0);
ibuf = mmap(NULL, FSIZE, PROT_READ, MAP_PRIVATE, fd, 0);
if (ibuf == MAP_FAILED) {
fputs("Failed to mmap() puzzles file\n", stderr);
return EXIT_FAILURE;
@ -52,18 +76,22 @@ int main(void)
fputs("Failed to open results file\n", stderr);
return EXIT_FAILURE;
}
char *obuf = mmap(NULL, FSIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
obuf = mmap(NULL, FSIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (obuf == MAP_FAILED) {
fputs("Failed to mmap() results file\n", stderr);
return EXIT_FAILURE;
}
close(fd);
struct sudoku sud;
for (unsigned o = 0; o < FSIZE; o += NCELLS) {
load(&sud, ibuf + o);
solve(&sud);
save(&sud, obuf + o);
pthread_t pool[NTHREADS];
uintptr_t i;
for (i = 0; i < NTHREADS; ++i) {
if (pthread_create(&pool[i], NULL, threadproc, (void *)i) != 0)
fprintf(stderr, "Failed to create thread #%lu\n", i);
}
for (i = 0; i < NTHREADS; ++i) {
if (pthread_join(pool[i], NULL) != 0)
fprintf(stderr, "Failed to join thread #%lu\n", i);
}
munmap(ibuf, FSIZE);