#include <ccan/htable/htable_type.h>
#include <ccan/htable/htable.c>
#include <ccan/hash/hash.h>
+#include <ccan/time/time.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <time.h>
#include <unistd.h>
-#include <sys/time.h>
static size_t hashcount;
struct object {
}
/* Nanoseconds per operation */
-static size_t normalize(const struct timeval *start,
- const struct timeval *stop,
+static size_t normalize(const struct timeabs *start,
+ const struct timeabs *stop,
unsigned int num)
{
- struct timeval diff;
-
- timersub(stop, start, &diff);
-
- /* Floating point is more accurate here. */
- return (double)(diff.tv_sec * 1000000 + diff.tv_usec)
- / num * 1000;
+ return time_to_nsec(time_divide(time_between(*stop, *start), num));
}
static size_t worst_run(struct htable *ht, size_t *deleted)
int main(int argc, char *argv[])
{
struct object *objs;
- size_t i, j, num, deleted;
- struct timeval start, stop;
+ unsigned int i, j;
+ size_t num, deleted;
+ struct timeabs start, stop;
struct htable_obj ht;
bool make_dumb = false;
printf("Initial insert: ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0; i < num; i++)
htable_obj_add(&ht, objs[i].self);
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Details: hash size %u, mask bits %u, perfect %.0f%%\n",
1U << ht.raw.bits, popcount(ht.raw.common_mask),
printf("Initial lookup (match): ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0; i < num; i++)
if (htable_obj_get(&ht, &i)->self != objs[i].self)
abort();
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Initial lookup (miss): ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0; i < num; i++) {
unsigned int n = i + num;
if (htable_obj_get(&ht, &n))
abort();
}
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
/* Lookups in order are very cache-friendly for judy; try random */
printf("Initial lookup (random): ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0, j = 0; i < num; i++, j = (j + 10007) % num)
if (htable_obj_get(&ht, &j)->self != &objs[j])
abort();
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
hashcount = 0;
printf("Initial delete all: ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0; i < num; i++)
if (!htable_obj_del(&ht, objs[i].self))
abort();
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Details: rehashes %zu\n", hashcount);
printf("Initial re-inserting: ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0; i < num; i++)
htable_obj_add(&ht, objs[i].self);
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
hashcount = 0;
printf("Deleting first half: ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0; i < num; i+=2)
if (!htable_obj_del(&ht, objs[i].self))
abort();
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Details: rehashes %zu, delete markers %zu\n",
for (i = 0; i < num; i+=2)
objs[i].key = num+i;
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0; i < num; i+=2)
htable_obj_add(&ht, objs[i].self);
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Details: delete markers %zu, perfect %.0f%%\n",
printf("Lookup after half-change (match): ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 1; i < num; i+=2)
if (htable_obj_get(&ht, &i)->self != objs[i].self)
abort();
if (htable_obj_get(&ht, &n)->self != objs[i].self)
abort();
}
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after half-change (miss): ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0; i < num; i++) {
unsigned int n = i + num * 2;
if (htable_obj_get(&ht, &n))
abort();
}
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
/* Hashtables with delete markers can fill with markers over time.
: "fifth");
fflush(stdout);
}
- gettimeofday(&start, NULL);
+ start = time_now();
for (j = 0; j < num; j++) {
if (!htable_obj_del(&ht, &objs[j]))
abort();
if (!htable_obj_add(&ht, &objs[j]))
abort();
}
- gettimeofday(&stop, NULL);
+ stop = time_now();
if (i != 0)
printf(" %zu ns\n", normalize(&start, &stop, num));
}
printf("Details: delete markers %zu, perfect %.0f%%\n",
count_deleted(&ht.raw), perfect(&ht.raw) * 100.0 / ht.raw.elems);
i = worst_run(&ht.raw, &deleted);
- printf("Details: worst run %zu (%zu deleted)\n", i, deleted);
+ printf("Details: worst run %u (%zu deleted)\n", i, deleted);
printf("Lookup after churn & spread (match): ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0; i < num; i++) {
unsigned int n = num * 5 + i * 9;
if (htable_obj_get(&ht, &n)->self != objs[i].self)
abort();
}
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after churn & spread (miss): ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0; i < num; i++) {
unsigned int n = num * (5 + 9) + i * 9;
if (htable_obj_get(&ht, &n))
abort();
}
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after churn & spread (random): ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0, j = 0; i < num; i++, j = (j + 10007) % num) {
unsigned int n = num * 5 + j * 9;
if (htable_obj_get(&ht, &n)->self != &objs[j])
abort();
}
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
hashcount = 0;
printf("Deleting half after churn & spread: ");
fflush(stdout);
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0; i < num; i+=2)
if (!htable_obj_del(&ht, objs[i].self))
abort();
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Adding (a different) half after churn & spread: ");
for (i = 0; i < num; i+=2)
objs[i].key = num*6+i*9;
- gettimeofday(&start, NULL);
+ start = time_now();
for (i = 0; i < num; i+=2)
htable_obj_add(&ht, objs[i].self);
- gettimeofday(&stop, NULL);
+ stop = time_now();
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Details: delete markers %zu, perfect %.0f%%\n",