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Buffered reading makes it faster than the single-threaded version

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This commit is contained in:
Eric Fischer 2016-01-12 11:47:46 -08:00
parent 333956ce42
commit 9d6ece5bbc
1 changed files with 19 additions and 12 deletions
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31
geojson.c
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@ -741,11 +741,6 @@ void parse_json(json_pull *jp, const char *reading, long long *layer_seq, volati
/* XXX check for any non-features in the outer object */
}
if (!quiet) {
fprintf(stderr, " \r");
// (stderr, "Read 10000.00 million features\r", *progress_seq / 1000000.0);
}
}
struct parse_json_args {
@ -1003,7 +998,7 @@ void *run_start_parsing(void *v) {
perror("stat read temp");
}
if (a->len != st.st_size) {
printf("%lld vs %lld\n", a->len, st.st_size);
fprintf(stderr, "wrong number of bytes in teomporary: %lld vs %lld\n", a->len, st.st_size);
}
a->len = st.st_size;
@ -1204,7 +1199,7 @@ int read_json(int argc, char **argv, char *fname, const char *layername, int max
if (fstat(fd, &st) == 0) {
off = lseek(fd, 0, SEEK_CUR);
if (off >= 0) {
// map = mmap(NULL, st.st_size - off, PROT_READ, MAP_PRIVATE, fd, off);
map = mmap(NULL, st.st_size - off, PROT_READ, MAP_PRIVATE, fd, off);
}
}
}
@ -1240,17 +1235,21 @@ int read_json(int argc, char **argv, char *fname, const char *layername, int max
}
unlink(readname);
int c;
volatile int is_parsing = 0;
long long ahead = 0;
long long initial_offset = 0;
pthread_t previous_reader;
while ((c = getc(fp)) != EOF) {
putc(c, readfp);
ahead++;
#define READ_BUF 2000
#define PARSE_MIN 10000000
char buf[READ_BUF];
int n;
if (c == '\n' && ahead > 1000000 && is_parsing == 0) {
while ((n = fread(buf, sizeof(char), READ_BUF, fp)) > 0) {
fwrite(buf, sizeof(char), n, readfp);
ahead += n;
if (buf[n - 1] == '\n' && ahead > PARSE_MIN && is_parsing == 0) {
if (initial_offset != 0) {
if (pthread_join(previous_reader, NULL) != 0) {
perror("pthread_join");
@ -1278,6 +1277,9 @@ int read_json(int argc, char **argv, char *fname, const char *layername, int max
unlink(readname);
}
}
if (n < 0) {
perror(reading);
}
if (initial_offset != 0) {
if (pthread_join(previous_reader, NULL) != 0) {
@ -1308,6 +1310,11 @@ int read_json(int argc, char **argv, char *fname, const char *layername, int max
}
}
if (!quiet) {
fprintf(stderr, " \r");
// (stderr, "Read 10000.00 million features\r", *progress_seq / 1000000.0);
}
for (i = 0; i < CPUS; i++) {
fclose(reader[i].metafile);
fclose(reader[i].geomfile);