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#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <getopt.h>
#include <emmintrin.h>
#include <pthread.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <time.h>
static size_t count_newlines(void *data, size_t size)
{
size_t i, total = 0;
for (i = 0; i < size; i++)
if (((char*)data)[i] == '\n')
total++;
return total;
}
static size_t count_newlines_sse2(void *blocks, size_t num_blocks)
{
size_t i, total;
__m128i const_0A, const_FF, counters;
__attribute__((aligned(16))) uint8_t parts[16];
const_0A = _mm_set_epi64x(0x0A0A0A0A0A0A0A0A, 0x0A0A0A0A0A0A0A0A);
const_FF = _mm_set_epi64x(0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF);
counters = const_FF;
for (i = 0; i < num_blocks; i++) {
__m128i data, tmp;
data = _mm_load_si128(blocks + i * 16);
tmp = _mm_cmpeq_epi8(data, const_0A);
counters = _mm_add_epi8(counters, tmp);
}
counters = _mm_sub_epi8(const_FF, counters);
_mm_store_si128((void*)parts, counters);
for (total = 0, i = 0; i < 16; i++)
total += (size_t)parts[i];
return total;
}
struct {
void *cursor;
size_t left;
pthread_mutex_t mutex;
size_t total;
pthread_mutex_t total_mutex;
} data_pool = {
.mutex = PTHREAD_MUTEX_INITIALIZER,
.total_mutex = PTHREAD_MUTEX_INITIALIZER
};
static void *thread_f(void *arg)
{
void *data;
size_t size, total = 0;
while (1) {
pthread_mutex_lock(&data_pool.mutex);
size = data_pool.left & (~15);
if (!size) {
pthread_mutex_unlock(&data_pool.mutex);
break;
}
else if (size > 16 * 256 * 64)
size = 16 * 256 * 64;
data = data_pool.cursor;
data_pool.cursor += size;
data_pool.left -= size;
pthread_mutex_unlock(&data_pool.mutex);
while (size) {
size_t blocks;
blocks = size / 16;
if (blocks > 255)
blocks = 255;
total += count_newlines_sse2(data, blocks);
data += blocks * 16;
size -= blocks * 16;
}
}
pthread_mutex_lock(&data_pool.total_mutex);
data_pool.total += total;
pthread_mutex_unlock(&data_pool.total_mutex);
return NULL;
}
static int turbowc(const char *path, size_t num_threads)
{
int ret = 1, opt, fd;
struct stat stat;
void *map;
size_t i;
pthread_t *threads;
struct timespec t0, t1;
double delta;
fd = open(path, O_RDONLY);
if (fd == -1) {
perror(path);
goto error_open;
}
fstat(fd, &stat);
if (fd == -1) {
perror("fstat");
goto error_fstat;
}
map = mmap(NULL, stat.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (!map) {
perror("mmap");
goto error_mmap;
}
data_pool.cursor = map;
data_pool.left = stat.st_size;
if (num_threads) {
threads = calloc(num_threads, sizeof(pthread_t));
if (!threads) {
perror("malloc");
goto error_malloc;
}
}
clock_gettime(CLOCK_MONOTONIC, &t0);
for (i = 0; i < num_threads; i++) {
int rv;
rv = pthread_create(threads + i, NULL, thread_f, NULL);
if (rv) {
size_t j;
for (j = 0; j < i; j++)
pthread_cancel(threads[j]);
goto error_pthread;
}
}
thread_f(NULL);
for (i = 0; i < num_threads; i++)
pthread_join(threads[i], NULL);
data_pool.total += count_newlines(data_pool.cursor, data_pool.left);
clock_gettime(CLOCK_MONOTONIC, &t1);
printf("%zu %s\n", data_pool.total, path);
delta = (t1.tv_sec - t0.tv_sec) +
((double)t1.tv_nsec - t0.tv_nsec) * 1.0e-9;
fprintf(stderr, " Total size: %zu\n", stat.st_size);
fprintf(stderr, " Total time: %f s\n", delta);
fprintf(stderr, "Time / char: %f ns\n", delta / stat.st_size * 1.0e+9);
fprintf(stderr, " Throughput: %f GB/s\n", stat.st_size / delta * 1.0e-9);
fprintf(stderr, "Total lines: %zu\n", data_pool.total);
fprintf(stderr, " Avg. line: %f char(s)\n", (double)stat.st_size / data_pool.total);
fprintf(stderr, "Time / line: %f ns\n", delta / data_pool.total * 1.0e+9);
ret = 0;
error_pthread:
if (num_threads)
free(threads);
error_malloc:
munmap(map, stat.st_size);
error_mmap:
error_fstat:
close(fd);
error_open:
return ret;
}
int main(int argc, char **argv)
{
int opt;
size_t num_threads = 1;
while ((opt = getopt(argc, argv, "vt:")) != -1) {
switch (opt) {
case 'v':
printf("turbowc, with mmap, SSE2 and multithreading\n");
break;
case 't':
num_threads = strtoull(optarg, NULL, 10);
break;
default:
print_usage:
fprintf(stderr, "usage: turbowc [-v] [-t THREADS] [FILE]\n");
return 1;
}
}
if (optind >= argc)
goto print_usage;
for (; optind < argc; optind++ )
if (turbowc(argv[optind], num_threads))
return 1;
return 0;
}
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