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/* Simple speed tests for jmap. */
#include <ccan/jmap/jmap_type.h>
#include <ccan/jmap/jmap.c>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
struct object {
/* Some contents. Doubles as consistency check. */
struct object *self;
};
/* Nanoseconds per operation */
static size_t normalize(const struct timeval *start,
const struct timeval *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;
}
JMAP_DEFINE_UINTIDX_TYPE(struct object, obj);
int main(int argc, char *argv[])
{
struct object *objs;
size_t i, j, num;
struct timeval start, stop;
struct jmap_obj *jmap;
num = argv[1] ? atoi(argv[1]) : 1000000;
objs = calloc(num, sizeof(objs[0]));
for (i = 0; i < num; i++) {
objs[i].self = &objs[i];
}
jmap = jmap_obj_new();
printf("Initial insert: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
jmap_obj_add(jmap, i, objs[i].self);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Initial lookup (match): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
if (jmap_obj_get(jmap, i)->self != objs[i].self)
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Initial lookup (miss): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
if (jmap_obj_get(jmap, i+num))
abort();
gettimeofday(&stop, NULL);
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);
for (i = 0, j = 0; i < num; i++, j = (j + 10007) % num)
if (jmap_obj_get(jmap, j)->self != &objs[j])
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Initial delete all: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
jmap_obj_del(jmap, i);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Initial re-inserting: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
jmap_obj_add(jmap, i, objs[i].self);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Deleting first half: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i+=2)
jmap_obj_del(jmap, i);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Adding (a different) half: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i+=2)
jmap_obj_add(jmap, num+i, objs[i].self);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after half-change (match): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 1; i < num; i+=2)
if (jmap_obj_get(jmap, i)->self != objs[i].self)
abort();
for (i = 0; i < num; i+=2)
if (jmap_obj_get(jmap, i+num)->self != objs[i].self)
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after half-change(miss): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
if (jmap_obj_get(jmap, i+num*2))
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
/* Hashtables with delete markers can fill with markers over time.
* so do some changes to see how it operates in long-term. */
printf("Details: churning first time\n");
for (i = 1; i < num; i+=2) {
if (!jmap_obj_del(jmap, i))
abort();
jmap_obj_add(jmap, i, objs[i].self);
}
for (i = 0; i < num; i+=2) {
if (!jmap_obj_del(jmap, i+num))
abort();
jmap_obj_add(jmap, i, objs[i].self);
}
for (i = 1; i < 5; i++) {
printf("Churning %s time: ",
i == 1 ? "second"
: i == 2 ? "third"
: i == 3 ? "fourth"
: "fifth");
fflush(stdout);
gettimeofday(&start, NULL);
for (j = 0; j < num; j++) {
if (!jmap_obj_del(jmap, num*(i-1)+j))
abort();
jmap_obj_add(jmap, num*i+j, &objs[j]);
}
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
}
/* Spread out the keys more to try to make it harder. */
printf("Details: reinserting with spread\n");
for (i = 0; i < num; i++) {
if (!jmap_obj_del(jmap, num*4 + i))
abort();
jmap_obj_add(jmap, num * 5 + i * 9, objs[i].self);
}
if (jmap_obj_popcount(jmap, 0, -1) != num)
abort();
printf("Lookup after churn & spread (match): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
if (jmap_obj_get(jmap, num * 5 + i * 9)->self != objs[i].self) {
printf("i =%u\n", i);
abort();
}
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after churn & spread (miss): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
if (jmap_obj_get(jmap, num * 6 + i * 9))
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after churn & spread (random): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0, j = 0; i < num; i++, j = (j + 10007) % num)
if (jmap_obj_get(jmap, num * 5 + j * 9)->self != &objs[j])
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after churn & spread (half-random): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0, j = 0; i < num/2; i++, j = (j + 10007) % num) {
if (jmap_obj_get(jmap, num * 5 + j * 9)->self != &objs[j])
abort();
if (jmap_obj_get(jmap, num * 5 + (j + 1) * 9)->self != &objs[j+1])
abort();
}
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Deleting half after churn & spread: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i+=2)
jmap_obj_del(jmap, num * 5 + i * 9);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Adding (a different) half after churn & spread: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i+=2)
jmap_obj_add(jmap, num * 6 + i * 9, objs[i].self);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
return 0;
}
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