void G_COLD
map_test(void)
{
sha1_t *keys;
map_t *mh, *mp;
int i;
size_t count;
int tests;
struct {
unsigned insertion, contains, removal;
} faster = { 0, 0, 0};
bool verbose = common_stats > 1;
if (common_stats <= 0)
return;
XMALLOC_ARRAY(keys, ITEM_COUNT);
for (i = 0; i < ITEM_COUNT; i++)
random_bytes(keys[i].data, SHA1_RAW_SIZE);
mh = map_create_hash(sha1_hash, sha1_eq);
mp = map_create_patricia(KEYBITS);
timeit(test_map_insert, mh, keys, ITEM_COUNT,
LOOPS, "map hash insertion", verbose);
timeit(test_map_insert, mp, keys, ITEM_COUNT,
LOOPS, "map PATRICIA insertion", verbose);
map_destroy(mh);
map_destroy(mp);
for (tests = 0, count = ITEM_COUNT; count > 1; count /= 10) {
double htime;
double ptime;
tests++;
mh = map_create_hash(sha1_hash, sha1_eq);
mp = map_create_patricia(KEYBITS);
htime = timeit(test_map_insert, mh, keys, count,
1, "map hash reloading", verbose);
ptime = timeit(test_map_insert, mp, keys, count,
1, "map PATRICIA reloading", verbose);
if (verbose)
g_info("PATRICIA insertion %s than hash with %zu items",
ptime < htime ? "faster" : "slower", count);
if (ptime < htime)
faster.insertion++;
htime = timeit(test_map_contains, mh, keys, count,
LOOPS, "map hash contains", verbose);
ptime = timeit(test_map_contains, mp, keys, count,
LOOPS, "map PATRICIA contains", verbose);
if (verbose)
g_info("PATRICIA contains %s than hash with %zu items",
ptime < htime ? "faster" : "slower", count);
if (ptime < htime)
faster.contains++;
htime = timeit(test_map_remove, mh, keys, count,
1, "map hash remove", verbose);
ptime = timeit(test_map_remove, mp, keys, count,
1, "map PATRICIA remove", verbose);
if (verbose)
g_info("PATRICIA remove %s than hash with %zu items",
ptime < htime ? "faster" : "slower", count);
if (ptime < htime)
faster.removal++;
map_destroy(mh);
map_destroy(mp);
}
if (faster.insertion)
g_info("PATRICIA insert was faster than hash in %d out of %d tests",
faster.insertion, tests);
if (faster.contains)
g_info(
"PATRICIA contains was faster than hash in %d out of %d tests",
faster.contains, tests);
if (faster.removal)
g_info("PATRICIA remove was faster than hash in %d out of %d tests",
faster.removal, tests);
XFREE_NULL(keys);
}
/**
* Create a new DBM wrapper over already created DB map.
*
* If value_data_size is 0, the length for value_size is used.
*
* @param dm The database (already opened)
* @param name Database name, for logs
* @param value_size Maximum value size, in bytes (structure)
* @param value_data_size Maximum value size, in bytes (serialized form)
* @param pack Serialization routine for values
* @param unpack Deserialization routine for values
* @param valfree Free routine for value (or NULL if none needed)
* @param cache_size Amount of items to cache (0 = no cache, 1 = default)
* @param hash_func Key hash function
* @param eq_func Key equality test function
*
* If serialization and deserialization routines are NULL pointers, data
* will be stored and retrieved as-is. In that case, they must be both
* NULL.
*/
dbmw_t *
dbmw_create(dbmap_t *dm, const char *name,
size_t value_size, size_t value_data_size,
dbmw_serialize_t pack, dbmw_deserialize_t unpack, dbmw_free_t valfree,
size_t cache_size, GHashFunc hash_func, GEqualFunc eq_func)
{
dbmw_t *dw;
g_assert(pack == NULL || value_size);
g_assert((pack != NULL) == (unpack != NULL));
g_assert(valfree == NULL || unpack != NULL);
g_assert(dm);
WALLOC0(dw);
dw->magic = DBMW_MAGIC;
dw->dm = dm;
dw->name = name;
dw->key_size = dbmap_key_size(dm);
dw->key_len = dbmap_key_length(dm);
dw->value_size = value_size;
dw->value_data_size = 0 == value_data_size ? value_size : value_data_size;
/* Make sure we do not violate the SDBM constraint */
g_assert(sdbm_is_storable(dw->key_size, dw->value_data_size));
/*
* There must be a serialization routine if the serialized length is not
* the same as the structure length.
*/
g_assert(dw->value_size == dw->value_data_size || pack != NULL);
/*
* For a small amount of items, a PATRICIA tree is more efficient
* than a hash table although it uses more memory.
*/
if (
NULL == dw->key_len &&
dw->key_size * 8 <= PATRICIA_MAXBITS &&
cache_size <= DBMW_CACHE
) {
dw->values = map_create_patricia(dw->key_size * 8);
} else {
dw->values = map_create_hash(hash_func, eq_func);
}
dw->keys = hash_list_new(hash_func, eq_func);
dw->pack = pack;
dw->unpack = unpack;
dw->valfree = valfree;
/*
* If a serialization routine is provided, we'll also have a need for
* deserialization. Allocate the message in/out streams.
*
* We're allocating one more byte than necessary to be able to check
* whether serialization stays within the imposed boundaries.
*/
if (dw->pack) {
dw->bs = bstr_create();
dw->mb = pmsg_new(PMSG_P_DATA, NULL, dw->value_data_size + 1);
}
/*
* If cache_size is zero, we won't cache anything but the latest
* value requested, in deserialized form. If modified, it will be
* written back immediately.
*
* If cache_size is one, use the default (DBMW_CACHE).
*
* Any other value is used as-is.
*/
if (0 == cache_size)
dw->max_cached = 1; /* No cache, only keep latest around */
else if (cache_size == 1)
dw->max_cached = DBMW_CACHE;
else
dw->max_cached = cache_size;
if (common_dbg)
g_debug("DBMW created \"%s\" with %s back-end "
"(max cached = %lu, key=%lu bytes, value=%lu bytes, "
"%lu max serialized)",
dw->name, dbmw_map_type(dw) == DBMAP_SDBM ? "sdbm" : "map",
(gulong) dw->max_cached,
(gulong) dw->key_size, (gulong) dw->value_size,
(gulong) dw->value_data_size);
return dw;
}