static void test_persistent_cache_create(struct ybc *const cache)
{
char config_buf[ybc_config_get_size()];
struct ybc_config *const config = (struct ybc_config *)config_buf;
ybc_config_init(config);
ybc_config_set_index_file(config, "./tmp_cache.index");
ybc_config_set_data_file(config, "./tmp_cache.data");
ybc_config_set_max_items_count(config, 1000);
ybc_config_set_data_file_size(config, 1024 * 1024);
/* Non-forced open must fail. */
if (ybc_open(cache, config, 0)) {
M_ERROR("non-existing persistent cache shouldn't be opened "
"without force");
}
/* Forced open must succeed. */
if (!ybc_open(cache, config, 1)) {
M_ERROR("cannot create persistent cache");
}
ybc_close(cache);
/* Non-forced open must succeed now. */
if (!ybc_open(cache, config, 0)) {
M_ERROR("cannot open existing persistent cache");
}
ybc_close(cache);
/* Remove files associated with the cache. */
ybc_remove(config);
/* Non-forced open must fail again. */
if (ybc_open(cache, config, 0)) {
M_ERROR("non-existing persistent cache shouldn't be opened "
"without force");
}
ybc_config_destroy(config);
}
static void simple_set(struct ybc *const cache, const size_t requests_count,
const size_t items_count, const size_t max_item_size)
{
struct m_rand_state rand_state;
uint64_t tmp;
char *const buf = p_malloc(max_item_size);
const struct ybc_key key = {
.ptr = &tmp,
.size = sizeof(tmp),
};
struct ybc_value value = {
.ptr = buf,
.size = 0,
.ttl = YBC_MAX_TTL,
};
m_rand_init(&rand_state);
for (size_t i = 0; i < requests_count; ++i) {
tmp = m_rand_next(&rand_state) % items_count;
value.size = m_rand_next(&rand_state) % (max_item_size + 1);
m_memset(buf, (char)value.size, value.size);
if (!ybc_item_set(cache, &key, &value)) {
M_ERROR("Cannot store item in the cache");
}
}
free(buf);
}
static void simple_get_miss(struct ybc *const cache,
const size_t requests_count, const size_t items_count)
{
char item_buf[ybc_item_get_size()];
struct ybc_item *const item = (struct ybc_item *)item_buf;
struct m_rand_state rand_state;
uint64_t tmp;
const struct ybc_key key = {
.ptr = &tmp,
.size = sizeof(tmp),
};
m_rand_init(&rand_state);
for (size_t i = 0; i < requests_count; ++i) {
tmp = m_rand_next(&rand_state) % items_count;
if (ybc_item_get(cache, item, &key)) {
M_ERROR("Unexpected item found");
}
}
}
static void simple_get_hit(struct ybc *const cache,
const size_t requests_count, const size_t items_count,
const size_t max_item_size)
{
char item_buf[ybc_item_get_size()];
struct ybc_item *const item = (struct ybc_item *)item_buf;
struct m_rand_state rand_state;
uint64_t tmp;
const struct ybc_key key = {
.ptr = &tmp,
.size = sizeof(tmp),
};
struct ybc_value value;
m_rand_init(&rand_state);
for (size_t i = 0; i < requests_count; ++i) {
tmp = m_rand_next(&rand_state) % items_count;
if (ybc_item_get(cache, item, &key)) {
/* Emulate access to the item */
ybc_item_get_value(item, &value);
if (value.size > max_item_size) {
M_ERROR("Unexpected value size");
}
if (!m_memset_check(value.ptr, (char)value.size, value.size)) {
fprintf(stderr, "i=%zu, requests_count=%zu, value.size=%zu\n", i, requests_count, value.size);
M_ERROR("Unexpected value");
}
ybc_item_release(item);
}
}
}
static void m_open(struct ybc *const cache, const size_t items_count,
const size_t hot_items_count, const size_t max_item_size)
{
char config_buf[ybc_config_get_size()];
struct ybc_config *const config = (struct ybc_config *)config_buf;
const size_t data_file_size = max_item_size * items_count;
const size_t hot_data_size = max_item_size * hot_items_count;
ybc_config_init(config);
ybc_config_set_max_items_count(config, items_count);
ybc_config_set_hot_items_count(config, hot_items_count);
ybc_config_set_data_file_size(config, data_file_size);
ybc_config_set_hot_data_size(config, hot_data_size);
if (!ybc_open(cache, config, 1)) {
M_ERROR("Cannot create a cache");
}
ybc_config_destroy(config);
}
static void measure_simple_ops(struct ybc *const cache,
const size_t requests_count, const size_t items_count,
const size_t hot_items_count, const size_t max_item_size)
{
double start_time, end_time;
double qps;
m_open(cache, items_count, hot_items_count, max_item_size);
printf("simple_ops(requests=%zu, items=%zu, "
"hot_items=%zu, max_item_size=%zu)\n",
requests_count, items_count, hot_items_count, max_item_size);
start_time = p_get_current_time();
simple_get_miss(cache, requests_count, items_count);
end_time = p_get_current_time();
qps = requests_count / (end_time - start_time) * 1000;
printf(" get_miss: %.02f qps\n", qps);
start_time = p_get_current_time();
simple_set(cache, requests_count, items_count, max_item_size);
end_time = p_get_current_time();
qps = requests_count / (end_time - start_time) * 1000;
printf(" set : %.02f qps\n", qps);
const size_t get_items_count = hot_items_count ? hot_items_count :
items_count;
start_time = p_get_current_time();
simple_get_hit(cache, requests_count, get_items_count, max_item_size);
end_time = p_get_current_time();
qps = requests_count / (end_time - start_time) * 1000;
printf(" get_hit : %.02f qps\n", qps);
ybc_close(cache);
}
static void test_set_txn_ops(struct ybc *const cache)
{
m_open_anonymous(cache);
char set_txn_buf[ybc_set_txn_get_size()];
struct ybc_set_txn *const txn = (struct ybc_set_txn *)set_txn_buf;
struct ybc_key key = {
.ptr = "abc",
.size = 3,
};
struct ybc_value value = {
.ptr = "qwerty",
.size = 6,
.ttl = YBC_MAX_TTL,
};
test_set_txn_rollback(cache, txn, &key, value.size);
test_set_txn_commit(cache, txn, &key, &value);
test_set_txn_commit_item(cache, txn, &key, &value);
/* Test zero-length key. */
key.size = 0;
test_set_txn_commit(cache, txn, &key, &value);
test_set_txn_commit_item(cache, txn, &key, &value);
/* Test zero-length value. */
value.size = 0;
test_set_txn_commit(cache, txn, &key, &value);
test_set_txn_commit_item(cache, txn, &key, &value);
/* Test too large key. */
value.size = 6;
key.size = SIZE_MAX;
test_set_txn_failure(cache, txn, &key, value.size);
/* Test too large value. */
key.size = 3;
test_set_txn_failure(cache, txn, &key, SIZE_MAX);
test_set_txn_failure(cache, txn, &key, SIZE_MAX / 2);
ybc_close(cache);
}
static void test_item_ops(struct ybc *const cache,
const size_t iterations_count)
{
m_open_anonymous(cache);
struct ybc_key key;
struct ybc_value value;
value.ttl = YBC_MAX_TTL;
for (size_t i = 0; i < iterations_count; ++i) {
key.ptr = &i;
key.size = sizeof(i);
expect_item_miss(cache, &key);
}
for (size_t i = 0; i < iterations_count; ++i) {
key.ptr = &i;
key.size = sizeof(i);
value.ptr = &i;
value.size = sizeof(i);
expect_item_set_no_acquire(cache, &key, &value);
expect_item_set(cache, &key, &value);
expect_item_remove(cache, &key);
}
for (size_t i = 0; i < iterations_count; ++i) {
key.ptr = &i;
key.size = sizeof(i);
expect_item_miss(cache, &key);
}
ybc_close(cache);
}
static void test_expiration(struct ybc *const cache)
{
m_open_anonymous(cache);
const struct ybc_key key = {
.ptr = "aaa",
.size = 3,
};
const struct ybc_value value = {
.ptr = "1234",
.size = 4,
.ttl = 200,
};
expect_item_set(cache, &key, &value);
p_sleep(300);
/* The item should expire now. */
expect_item_miss(cache, &key);
ybc_close(cache);
}
static void test_dogpile_effect_ops(struct ybc *const cache)
{
m_open_anonymous(cache);
struct ybc_key key = {
.ptr = "foo",
.size = 3,
};
const struct ybc_value value = {
.ptr = "bar",
.size = 3,
.ttl = 2 * 1000,
};
/*
* De-aware method should return an empty item on the first try
* for non-existing item. The second try for the same non-existing item
* will result in waiting for up to grace ttl period of time.
*/
expect_item_miss_de(cache, &key, 200);
/* Will wait for 200 milliseconds. */
expect_item_miss_de(cache, &key, 10 * 1000);
key.ptr = "bar";
expect_item_set(cache, &key, &value);
/*
* If grace ttl is smaller than item's ttl, then the item should be returned.
*/
expect_item_hit_de(cache, &key, &value, value.ttl / 10);
/*
* If grace ttl is larger than item's ttl, then an empty item
* should be returned on the first try and the item itself should be returned
* on subsequent tries irregardless of grace ttl value.
*/
expect_item_miss_de(cache, &key, value.ttl * 10);
expect_item_hit_de(cache, &key, &value, value.ttl * 10);
expect_item_hit_de(cache, &key, &value, value.ttl / 10);
ybc_close(cache);
}
static void test_dogpile_effect_ops_async(struct ybc *const cache)
{
char item_buf[ybc_item_get_size()];
struct ybc_item *const item = (struct ybc_item *)item_buf;
m_open_anonymous(cache);
struct ybc_key key = {
.ptr = "foo",
.size = 3,
};
const struct ybc_value value = {
.ptr = "bar",
.size = 3,
.ttl = 2 * 1000,
};
/*
* De-aware method should return an empty item on the first try
* for non-existing item. The second try for the same non-existing item
* should result in YBC_DE_WOULDBLOCK.
*/
if (ybc_item_get_de_async(cache, item, &key, 10 * 1000) != YBC_DE_NOTFOUND) {
M_ERROR("unexpected status returned from ybc_item_get_de_async()");
}
/* Should return immediately instead of waiting for 10 seconds. */
if (ybc_item_get_de_async(cache, item, &key, 5 * 1000) !=
YBC_DE_WOULDBLOCK) {
M_ERROR("unexpected status returned from ybc_item_get_de_async()");
}
key.ptr = "bar";
expect_item_set(cache, &key, &value);
if (ybc_item_get_de_async(cache, item, &key, value.ttl / 10) !=
YBC_DE_SUCCESS) {
M_ERROR("unexpected status returned from ybc_item_get_de_async()");
}
ybc_item_release(item);
/*
* If grace ttl is larger than item's ttl, then an empty item
* should be returned on the first try and the item itself should be returned
* on subsequent tries irregardless of grace ttl value.
*/
if (ybc_item_get_de_async(cache, item, &key, value.ttl * 10) !=
YBC_DE_NOTFOUND) {
M_ERROR("unexpected status returned from ybc_item_get_de_async()");
}
if (ybc_item_get_de_async(cache, item, &key, value.ttl * 10) !=
YBC_DE_SUCCESS) {
M_ERROR("unexpected status returned from ybc_item_get_de_async()");
}
ybc_item_release(item);
if (ybc_item_get_de_async(cache, item, &key, value.ttl / 10) !=
YBC_DE_SUCCESS) {
M_ERROR("unexpected status returned from ybc_item_get_de_async()");
}
ybc_item_release(item);
ybc_close(cache);
}
static void m_test_de_hashtable(struct ybc *const cache,
const size_t hashtable_size, const size_t pending_items_count)
{
char config_buf[ybc_config_get_size()];
struct ybc_config *const config = (struct ybc_config *)config_buf;
ybc_config_init(config);
ybc_config_set_de_hashtable_size(config, hashtable_size);
if (!ybc_open(cache, config, 1)) {
M_ERROR("cannot create an anonymous cache");
}
ybc_config_destroy(config);
char item_buf[ybc_item_get_size()];
struct ybc_item *const item = (struct ybc_item *)item_buf;
size_t i;
struct ybc_key key = {
.ptr = &i,
.size = sizeof(i),
};
for (i = 0; i < pending_items_count; ++i) {
if (ybc_item_get_de_async(cache, item, &key, 1000) != YBC_DE_NOTFOUND) {
M_ERROR("unexpected status returned from ybc_item_get_de_async()");
}
if (ybc_item_get_de_async(cache, item, &key, 1000) != YBC_DE_WOULDBLOCK) {
M_ERROR("unexpected status returned from ybc_item_get_de_async()");
}
}
ybc_close(cache);
}
static void test_dogpile_effect_hashtable(struct ybc *const cache)
{
for (size_t hashtable_size = 1; hashtable_size <= 1000;
hashtable_size *= 10) {
for (size_t pending_items_count = 1; pending_items_count <= 10000;
pending_items_count *= 100) {
m_test_de_hashtable(cache, hashtable_size, pending_items_count);
}
}
}
static void test_cluster_ops(const size_t cluster_size,
const size_t iterations_count)
{
char configs_buf[ybc_config_get_size() * cluster_size];
struct ybc_config *const configs = (struct ybc_config *)configs_buf;
for (size_t i = 0; i < cluster_size; ++i) {
ybc_config_init(YBC_CONFIG_GET(configs, i));
}
char cluster_buf[ybc_cluster_get_size(cluster_size)];
struct ybc_cluster *const cluster = (struct ybc_cluster *)cluster_buf;
/* Unfored open must fail. */
if (ybc_cluster_open(cluster, configs, cluster_size, 0)) {
M_ERROR("cache cluster shouldn't be opened without force");
}
/* Forced open must succeed. */
if (!ybc_cluster_open(cluster, configs, cluster_size, 1)) {
M_ERROR("failed opening cache cluster");
}
/* Configs are no longer needed, so they can be destroyed. */
for (size_t i = 0; i < cluster_size; ++i) {
ybc_config_destroy(YBC_CONFIG_GET(configs, i));
}
struct ybc_key key;
struct ybc_value value;
value.ttl = YBC_MAX_TTL;
for (size_t i = 0; i < iterations_count; ++i) {
key.ptr = &i;
key.size = sizeof(i);
value.ptr = &i;
value.size = sizeof(i);
struct ybc *const cache = ybc_cluster_get_cache(cluster, &key);
expect_item_set(cache, &key, &value);
}
ybc_cluster_clear(cluster);
for (size_t i = 0; i < iterations_count; ++i) {
key.ptr = &i;
key.size = sizeof(i);
value.ptr = &i;
value.size = sizeof(i);
struct ybc *const cache = ybc_cluster_get_cache(cluster, &key);
expect_item_miss(cache, &key);
}
ybc_cluster_close(cluster);
}
static struct ybc_item *m_get_item(struct ybc_item *const items, const size_t i)
{
return (struct ybc_item *)(((char *)items) + ybc_item_get_size() * i);
}
static void test_overlapped_acquirements(struct ybc *const cache,
const size_t items_count)
{
m_open_anonymous(cache);
char added_items_buf[ybc_item_get_size() * items_count];
struct ybc_item *const added_items = (struct ybc_item *)added_items_buf;
char obtained_items_buf[ybc_item_get_size() * items_count];
struct ybc_item *const obtained_items = (struct ybc_item *)obtained_items_buf;
size_t i;
const struct ybc_key key = {
.ptr = &i,
.size = sizeof(i),
};
const struct ybc_value value = {
.ptr = &i,
.size = sizeof(i),
.ttl = YBC_MAX_TTL,
};
const struct ybc_key static_key = {
.ptr = "aaaabbb",
.size = 7,
};
for (i = 0; i < items_count; ++i) {
ybc_item_set_item(cache, m_get_item(added_items, i), &static_key, &value);
}
for (i = 0; i < items_count; ++i) {
ybc_item_get(cache, m_get_item(obtained_items, i), &static_key);
}
for (i = 0; i < items_count; ++i) {
ybc_item_release(m_get_item(obtained_items, i));
ybc_item_release(m_get_item(added_items, i));
}
for (i = 0; i < items_count; ++i) {
ybc_item_set_item(cache, m_get_item(added_items, i), &key, &value);
}
for (i = 0; i < items_count; ++i) {
ybc_item_get(cache, m_get_item(obtained_items, i), &key);
expect_value(m_get_item(obtained_items, i), &value);
}
for (i = 0; i < items_count; ++i) {
ybc_item_release(m_get_item(obtained_items, items_count - i - 1));
}
for (i = 0; i < items_count; ++i) {
ybc_item_release(m_get_item(added_items, i));
}
ybc_close(cache);
}
static void test_interleaved_sets(struct ybc *const cache)
{
m_open_anonymous(cache);
char set_txn1_buf[ybc_set_txn_get_size()];
char set_txn2_buf[ybc_set_txn_get_size()];
struct ybc_set_txn *const txn1 = (struct ybc_set_txn *)set_txn1_buf;
struct ybc_set_txn *const txn2 = (struct ybc_set_txn *)set_txn2_buf;
char item1_buf[ybc_item_get_size()];
char item2_buf[ybc_item_get_size()];
struct ybc_item *const item1 = (struct ybc_item *)item1_buf;
struct ybc_item *const item2 = (struct ybc_item *)item2_buf;
const struct ybc_key key1 = {
.ptr = "foo",
.size = 3,
};
const struct ybc_key key2 = {
.ptr = "barz",
.size = 4,
};
const struct ybc_value value1 = {
.ptr = "123456",
.size = 6,
.ttl = YBC_MAX_TTL,
};
const struct ybc_value value2 = {
.ptr = "qwert",
.size = 4,
.ttl = YBC_MAX_TTL,
};
if (!ybc_set_txn_begin(cache, txn1, &key1, value1.size, value1.ttl)) {
M_ERROR("Cannot start the first set transaction");
}
if (!ybc_set_txn_begin(cache, txn2, &key2, value2.size, value2.ttl)) {
M_ERROR("Cannot start the second set transaction");
}
struct ybc_set_txn_value txn_value;
ybc_set_txn_get_value(txn1, &txn_value);
assert(txn_value.size == value1.size);
memcpy(txn_value.ptr, value1.ptr, value1.size);
ybc_set_txn_get_value(txn2, &txn_value);
assert(txn_value.size == value2.size);
memcpy(txn_value.ptr, value2.ptr, value2.size);
expect_item_miss(cache, &key1);
expect_item_miss(cache, &key2);
ybc_set_txn_commit_item(txn1, item1);
ybc_set_txn_commit_item(txn2, item2);
expect_value(item1, &value1);
expect_value(item2, &value2);
ybc_item_release(item1);
ybc_item_release(item2);
expect_item_hit(cache, &key1, &value1);
expect_item_hit(cache, &key2, &value2);
ybc_close(cache);
}
static void test_instant_clear(struct ybc *const cache)
{
char config_buf[ybc_config_get_size()];
struct ybc_config *const config = (struct ybc_config *)config_buf;
ybc_config_init(config);
ybc_config_set_max_items_count(config, 1000);
ybc_config_set_data_file_size(config, 128 * 1024);
if (!ybc_open(cache, config, 1)) {
M_ERROR("cannot create anonymous cache");
}
ybc_config_destroy(config);
struct ybc_key key;
struct ybc_value value;
/* Add a lot of items to the cache */
value.ttl = YBC_MAX_TTL;
for (size_t i = 0; i < 1000; ++i) {
key.ptr = &i;
key.size = sizeof(i);
value.ptr = &i;
value.size = sizeof(i);
expect_item_set(cache, &key, &value);
}
ybc_clear(cache);
/* Test that the cache doesn't contain any items after the clearance. */
for (size_t i = 0; i < 1000; ++i) {
key.ptr = &i;
key.size = sizeof(i);
expect_item_miss(cache, &key);
}
ybc_close(cache);
}
static void expect_persistent_survival(struct ybc *const cache,
const uint64_t sync_interval)
{
char config_buf[ybc_config_get_size()];
struct ybc_config *const config = (struct ybc_config *)config_buf;
ybc_config_init(config);
ybc_config_set_index_file(config, "./tmp_cache.index");
ybc_config_set_data_file(config, "./tmp_cache.data");
ybc_config_set_max_items_count(config, 10);
ybc_config_set_data_file_size(config, 1024);
ybc_config_set_sync_interval(config, sync_interval);
if (!ybc_open(cache, config, 1)) {
M_ERROR("cannot create persistent cache");
}
const struct ybc_key key = {
.ptr = "foobar",
.size = 6.
};
const struct ybc_value value = {
.ptr = "qwert",
.size = 5,
.ttl = YBC_MAX_TTL,
};
expect_item_set(cache, &key, &value);
ybc_close(cache);
/* Re-open the same cache and make sure the item exists there. */
if (!ybc_open(cache, config, 0)) {
M_ERROR("cannot open persistent cache");
}
expect_item_hit(cache, &key, &value);
ybc_close(cache);
ybc_remove(config);
ybc_config_destroy(config);
}
static void test_persistent_survival(struct ybc *const cache)
{
/*
* Test persistence with enabled data syncing.
*/
expect_persistent_survival(cache, 10 * 1000);
/*
* Test persistence with disabled data syncing.
*/
expect_persistent_survival(cache, 0);
}
static void test_broken_index_handling(struct ybc *const cache)
{
char config_buf[ybc_config_get_size()];
struct ybc_config *const config = (struct ybc_config *)config_buf;
ybc_config_init(config);
ybc_config_set_index_file(config, "./tmp_cache.index");
ybc_config_set_data_file(config, "./tmp_cache.data");
ybc_config_set_max_items_count(config, 1000);
ybc_config_set_data_file_size(config, 64 * 1024);
/* Create index and data files. */
if (!ybc_open(cache, config, 1)) {
M_ERROR("cannot create persistent cache");
}
struct ybc_key key;
struct ybc_value value = {
.ptr = "foobar",
.size = 6,
.ttl = YBC_MAX_TTL,
};
/* Add some data to cache. */
for (size_t i = 0; i < 1000; i++) {
key.ptr = &i;
key.size = sizeof(i);
expect_item_set(cache, &key, &value);
}
ybc_close(cache);
/* Corrupt index file. */
FILE *const fp = fopen("./tmp_cache.index", "r+");
int rv = fseek(fp, 0, SEEK_END);
if (rv != 0) {
M_ERROR("fseek(SEEK_END, 0) failed");
}
const long pos = ftell(fp);
if (pos < 0) {
M_ERROR("ftell failed");
}
const size_t file_size = (size_t)pos;
rv = fseek(fp, 0, SEEK_SET);
if (rv != 0) {
M_ERROR("fseek(SEEK_SET, 0) failed");
}
for (size_t i = 0; i < file_size; ++i) {
if (fputc((unsigned char)i, fp) == EOF) {
M_ERROR("cannot write data");
}
}
fclose(fp);
/* Try reading index file. It must become "empty". */
if (!ybc_open(cache, config, 0)) {
M_ERROR("cannot open persistent cache");
}
for (size_t i = 0; i < 1000; ++i) {
key.ptr = &i;
key.size = sizeof(i);
expect_item_miss(cache, &key);
}
ybc_close(cache);
/* Remove index and data files. */
ybc_remove(config);
ybc_config_destroy(config);
}
static void test_large_cache(struct ybc *const cache)
{
char config_buf[ybc_config_get_size()];
struct ybc_config *const config = (struct ybc_config *)config_buf;
ybc_config_init(config);
ybc_config_set_max_items_count(config, 10 * 1000);
ybc_config_set_data_file_size(config, 32 * 1024 * 1024);
if (!ybc_open(cache, config, 1)) {
M_ERROR("cannot create anonymous cache");
}
ybc_config_destroy(config);
const size_t value_buf_size = 13 * 3457;
char *const value_buf = p_malloc(value_buf_size);
memset(value_buf, 'q', value_buf_size);
struct ybc_key key;
const struct ybc_value value = {
.ptr = value_buf,
.size = value_buf_size,
.ttl = YBC_MAX_TTL,
};
/* Test handling of cache data size wrapping. */
for (size_t i = 0; i < 10 * 1000; ++i) {
key.ptr = &i;
key.size = sizeof(i);
expect_item_set(cache, &key, &value);
}
p_free(value_buf);
ybc_close(cache);
}
static void test_out_of_memory(struct ybc *const cache)
{
char config_buf[ybc_config_get_size()];
struct ybc_config *const config = (struct ybc_config *)config_buf;
ybc_config_init(config);
ybc_config_set_data_file_size(config, 1024 * 1024);
if (!ybc_open(cache, config, 1)) {
M_ERROR("cannot create anonymous cache");
}
ybc_config_destroy(config);
const size_t value_buf_size = 1024 * 1024 + 1;
void *const value_buf = p_malloc(value_buf_size);
memset(value_buf, 0, value_buf_size);
char item_buf[ybc_item_get_size()];
struct ybc_item *const item = (struct ybc_item *)item_buf;
struct ybc_key key = {
.ptr = "foobar",
.size = 6,
};
struct ybc_value value = {
.ptr = value_buf,
.size = value_buf_size,
.ttl = YBC_MAX_TTL,
};
/*
* The value size exceeds cache size.
*/
if (ybc_item_set(cache, &key, &value)) {
M_ERROR("unexpected item addition");
}
/*
* The acquired item should prevent from adding new item into the cache.
*/
value.size -= 1000;
if (!ybc_item_set_item(cache, item, &key, &value)) {
M_ERROR("cannot store item to cache");
}
char item2_buf[ybc_item_get_size()];
struct ybc_item *const item2 =(struct ybc_item *)item2_buf;
key.ptr = "abcdef";
value.size = 1000;
if (ybc_item_set_item(cache, item2, &key, &value)) {
M_ERROR("unexpected item addition");
}
ybc_item_release(item);
/*
* Now the item2 should be added, since the item is released
* and the cache has enough room for the item2.
*/
if (!ybc_item_set_item(cache, item2, &key, &value)) {
M_ERROR("cannot store item to cache");
}
ybc_item_release(item2);
p_free(value_buf);
ybc_close(cache);
}
static int is_item_exists(struct ybc *const cache,
const struct ybc_key *const key)
{
char item_buf[ybc_item_get_size()];
struct ybc_item *const item = (struct ybc_item *)item_buf;
if (!ybc_item_get(cache, item, key)) {
return 0;
}
ybc_item_release(item);
return 1;
}
static void expect_cache_with_data(struct ybc *const cache,
const size_t items_count, const size_t expected_hits_count,
struct ybc_key *const key, struct ybc_value *const value)
{
size_t hits_count = 0;
for (size_t i = 0; i < items_count; ++i) {
key->ptr = &i;
key->size = sizeof(i);
if (is_item_exists(cache, key)) {
value->ptr = &i;
value->size = sizeof(i);
expect_item_hit(cache, key, value);
++hits_count;
}
}
assert(hits_count > expected_hits_count);
}
static void expect_cache_works(struct ybc *const cache,
const size_t items_count, const size_t expected_hits_count,
const size_t hot_items_count, const size_t hot_data_size,
const uint64_t sync_interval)
{
char config_buf[ybc_config_get_size()];
struct ybc_config *const config = (struct ybc_config *)config_buf;
ybc_config_init(config);
assert(items_count <= SIZE_MAX / 100);
ybc_config_set_max_items_count(config, items_count * 2);
ybc_config_set_data_file_size(config, items_count * 100);
ybc_config_set_hot_items_count(config, hot_items_count);
ybc_config_set_hot_data_size(config, hot_data_size);
ybc_config_set_sync_interval(config, sync_interval);
if (!ybc_open(cache, config, 1)) {
M_ERROR("cannot create anonymous cache");
}
ybc_config_destroy(config);
struct ybc_key key;
struct ybc_value value;
value.ttl = YBC_MAX_TTL;
for (size_t i = 0; i < items_count; ++i) {
key.ptr = &i;
key.size = sizeof(i);
value.ptr = &i;
value.size = sizeof(i);
expect_item_set(cache, &key, &value);
}
/*
* Verify twice that the cache contains added data.
* The second verification checks correctness of internal cache algorithms,
* which may re-arrange data when reading it during the first check
* (for instance, cache compaction algorithms).
*/
expect_cache_with_data(cache, items_count, expected_hits_count, &key, &value);
expect_cache_with_data(cache, items_count, expected_hits_count, &key, &value);
ybc_close(cache);
}
static void test_data_compaction(struct ybc *const cache)
{
/*
* The cache will compact data on items' retrieval,
* because items_count * item_size is greater than hot_data_size.
* It is assumed that item_size is equal to 2*sizeof(size_t)
* (8 bytes on 32-bit builds and 16 bytes on 64-bit builds).
* See expect_cache_works() sources for details.
*/
const size_t items_count = 1000;
const size_t expected_hits_count = 900;
const size_t hot_items_count = 1000;
const size_t hot_data_size = items_count * sizeof(size_t) * 3;
const uint64_t sync_interval = 10 * 1000;
expect_cache_works(cache, items_count, expected_hits_count, hot_items_count,
hot_data_size, sync_interval);
}
static void test_small_sync_interval(struct ybc *const cache)
{
char config_buf[ybc_config_get_size()];
struct ybc_config *const config = (struct ybc_config *)config_buf;
ybc_config_init(config);
ybc_config_set_max_items_count(config, 100);
ybc_config_set_data_file_size(config, 4000);
ybc_config_set_sync_interval(config, 100);
if (!ybc_open(cache, config, 1)) {
M_ERROR("cannot create anonymous cache");
}
ybc_config_destroy(config);
struct ybc_key key;
const struct ybc_value value = {
.ptr = "1234567890a",
.size = 11,
.ttl = YBC_MAX_TTL,
};
for (size_t i = 0; i < 10; ++i) {
for (size_t j = 0; j < 100; ++j) {
key.ptr = &j;
key.size = sizeof(j);
expect_item_set(cache, &key, &value);
}
p_sleep(31);
}
ybc_close(cache);
}
static void test_disabled_hot_items_cache(struct ybc *const cache)
{
const size_t items_count = 1000;
const size_t expected_hits_count = 900;
const size_t hot_items_count = 0;
const size_t hot_data_size = 100 * 1024;
const uint64_t sync_interval = 10 * 1000;
expect_cache_works(cache, items_count, expected_hits_count, hot_items_count,
hot_data_size, sync_interval);
}
static void test_disabled_data_compaction(struct ybc *const cache)
{
const size_t items_count = 1000;
const size_t expected_hits_count = 900;
const size_t hot_items_count = 100;
const size_t hot_data_size = 0;
const uint64_t sync_interval = 10 * 1000;
expect_cache_works(cache, items_count, expected_hits_count, hot_items_count,
hot_data_size, sync_interval);
}
static void test_disabled_syncing(struct ybc *const cache)
{
const size_t items_count = 1000;
const size_t expected_hits_count = 900;
const size_t hot_items_count = 100;
const size_t hot_data_size = 10 * 1024;
const uint64_t sync_interval = 0;
expect_cache_works(cache, items_count, expected_hits_count, hot_items_count,
hot_data_size, sync_interval);
}
struct thread_task
{
struct ybc *const cache;
int should_exit;
};
static void thread_func(void *const ctx)
{
struct thread_task *const task = ctx;
char item_buf[ybc_item_get_size()];
struct ybc_item *const item = (struct ybc_item *)item_buf;
struct ybc_key key;
struct ybc_value value;
int tmp;
key.size = sizeof(tmp);
value.size = sizeof(tmp);
value.ttl = YBC_MAX_TTL;
while (!task->should_exit) {
/*
* It is OK using non-threadsafe rand() function here.
*/
tmp = rand() % 100;
key.ptr = &tmp;
value.ptr = &tmp;
switch (rand() % 5) {
case 0: case 1:
if (!ybc_item_set_item(task->cache, item, &key, &value)) {
M_ERROR("error when storing item in the cache");
}
expect_value(item, &value);
ybc_item_release(item);
break;
case 2:
(void)ybc_item_remove(task->cache, &key);
break;
default:
if (ybc_item_get(task->cache, item, &key)) {
expect_value(item, &value);
ybc_item_release(item);
}
}
}
}
static void test_multithreaded_access(struct ybc *const cache,
const size_t threads_count)
{
m_open_anonymous(cache);
struct p_thread threads[threads_count];
struct thread_task task = {
.cache = cache,
.should_exit = 0,
};
for (size_t i = 0; i < threads_count; ++i) {
p_thread_init_and_start(&threads[i], thread_func, &task);
}
p_sleep(300);
task.should_exit = 1;
for (size_t i = 0; i < threads_count; ++i) {
p_thread_join_and_destroy(&threads[i]);
}
ybc_close(cache);
}
int main(void)
{
char cache_buf[ybc_get_size()];
struct ybc *const cache = (struct ybc *)cache_buf;
test_anonymous_cache_create(cache);
test_persistent_cache_create(cache);
test_set_txn_ops(cache);
test_item_ops(cache, 1000);
test_expiration(cache);
test_dogpile_effect_ops_async(cache);
test_dogpile_effect_ops(cache);
test_dogpile_effect_hashtable(cache);
test_cluster_ops(5, 1000);
test_overlapped_acquirements(cache, 1000);
test_interleaved_sets(cache);
test_instant_clear(cache);
test_persistent_survival(cache);
test_broken_index_handling(cache);
test_large_cache(cache);
test_out_of_memory(cache);
test_data_compaction(cache);
test_small_sync_interval(cache);
test_disabled_hot_items_cache(cache);
test_disabled_data_compaction(cache);
test_disabled_syncing(cache);
test_multithreaded_access(cache, 100);
printf("All functional tests done\n");
return 0;
}
static void simple_set(struct ybc *const cache, const size_t requests_count,
const size_t items_count, const size_t max_item_size)
{
struct m_rand_state rand_state;
uint64_t tmp;
char *const buf = p_malloc(max_item_size);
const struct ybc_key key = {
.ptr = &tmp,
.size = sizeof(tmp),
};
struct ybc_value value = {
.ptr = buf,
.size = 0,
.ttl = YBC_MAX_TTL,
};
m_rand_init(&rand_state);
for (size_t i = 0; i < requests_count; ++i) {
tmp = m_rand_next(&rand_state) % items_count;
value.size = m_rand_next(&rand_state) % (max_item_size + 1);
m_memset(buf, (char)value.size, value.size);
if (!ybc_item_set(cache, &key, &value)) {
M_ERROR("Cannot store item in the cache");
}
}
p_free(buf);
}
static void simple_set_simple(struct ybc *const cache,
const size_t requests_count, const size_t items_count,
const size_t max_item_size)
{
struct m_rand_state rand_state;
uint64_t tmp;
char *const buf = p_malloc(max_item_size);
const struct ybc_key key = {
.ptr = &tmp,
.size = sizeof(tmp),
};
struct ybc_value value = {
.ptr = buf,
.size = 0,
.ttl = YBC_MAX_TTL,
};
m_rand_init(&rand_state);
for (size_t i = 0; i < requests_count; ++i) {
tmp = m_rand_next(&rand_state) % items_count;
value.size = m_rand_next(&rand_state) % (max_item_size + 1);
m_memset(buf, (char)value.size, value.size);
if (!ybc_simple_set(cache, &key, &value)) {
M_ERROR("Cannot store item in the cache");
}
}
p_free(buf);
}
static void simple_get_miss(struct ybc *const cache,
const size_t requests_count, const size_t items_count)
{
char item_buf[ybc_item_get_size()];
struct ybc_item *const item = (struct ybc_item *)item_buf;
struct m_rand_state rand_state;
uint64_t tmp;
const struct ybc_key key = {
.ptr = &tmp,
.size = sizeof(tmp),
};
m_rand_init(&rand_state);
for (size_t i = 0; i < requests_count; ++i) {
tmp = m_rand_next(&rand_state) % items_count;
if (ybc_item_get(cache, item, &key)) {
M_ERROR("Unexpected item found");
}
}
}
static void simple_get_hit(struct ybc *const cache,
const size_t requests_count, const size_t items_count,
const size_t max_item_size)
{
char item_buf[ybc_item_get_size()];
struct ybc_item *const item = (struct ybc_item *)item_buf;
struct m_rand_state rand_state;
uint64_t tmp;
const struct ybc_key key = {
.ptr = &tmp,
.size = sizeof(tmp),
};
struct ybc_value value;
m_rand_init(&rand_state);
for (size_t i = 0; i < requests_count; ++i) {
tmp = m_rand_next(&rand_state) % items_count;
if (ybc_item_get(cache, item, &key)) {
/* Emulate access to the item */
ybc_item_get_value(item, &value);
if (value.size > max_item_size) {
M_ERROR("Unexpected value size");
}
if (!m_memset_check(value.ptr, (char)value.size, value.size)) {
fprintf(stderr, "i=%zu, requests_count=%zu, value.size=%zu\n", i, requests_count, value.size);
M_ERROR("Unexpected value");
}
ybc_item_release(item);
}
}
}
static void simple_get_simple_hit(struct ybc *const cache,
const size_t requests_count, const size_t items_count,
const size_t max_item_size)
{
struct m_rand_state rand_state;
uint64_t tmp;
const struct ybc_key key = {
.ptr = &tmp,
.size = sizeof(tmp),
};
struct ybc_value value;
value.size = max_item_size;
value.ptr = p_malloc(value.size);
m_rand_init(&rand_state);
for (size_t i = 0; i < requests_count; ++i) {
tmp = m_rand_next(&rand_state) % items_count;
value.size = max_item_size;
int rv = ybc_simple_get(cache, &key, &value);
if (rv == 0) {
continue;
}
assert(rv == 1);
if (value.size > max_item_size) {
M_ERROR("Unexpected value size");
}
if (!m_memset_check(value.ptr, (char)value.size, value.size)) {
fprintf(stderr, "i=%zu, requests_count=%zu, value.size=%zu\n", i, requests_count, value.size);
M_ERROR("Unexpected value");
}
}
p_free((void *)value.ptr);
}
static void m_open(struct ybc *const cache, const int use_shm,
const size_t items_count, const size_t hot_items_count,
const size_t max_item_size, const int has_overwrite_protection)
{
char config_buf[ybc_config_get_size()];
struct ybc_config *const config = (struct ybc_config *)config_buf;
const size_t data_file_size = max_item_size * items_count;
const size_t hot_data_size = max_item_size * hot_items_count;
ybc_config_init(config);
if (use_shm) {
ybc_config_set_data_file(config, "/dev/shm/ybc-perftest-cache.data");
ybc_config_set_index_file(config, "/dev/shm/ybc-perftest-cache.index");
}
ybc_config_set_max_items_count(config, items_count);
ybc_config_set_hot_items_count(config, hot_items_count);
ybc_config_set_data_file_size(config, data_file_size);
ybc_config_set_hot_data_size(config, hot_data_size);
if (!has_overwrite_protection) {
ybc_config_disable_overwrite_protection(config);
}
if (!ybc_open(cache, config, 1)) {
M_ERROR("Cannot create a cache");
}
ybc_config_destroy(config);
if (use_shm) {
ybc_clear(cache);
}
}
static void m_close(struct ybc *const cache, const int use_shm)
{
ybc_close(cache);
if (!use_shm) {
return;
}
char config_buf[ybc_config_get_size()];
struct ybc_config *const config = (struct ybc_config *)config_buf;
ybc_config_init(config);
ybc_config_set_data_file(config, "/dev/shm/ybc-perftest-cache.data");
ybc_config_set_index_file(config, "/dev/shm/ybc-perftest-cache.index");
ybc_remove(config);
ybc_config_destroy(config);
}
static void measure_simple_ops(struct ybc *const cache, const int use_shm,
const size_t requests_count, const size_t items_count,
const size_t hot_items_count, const size_t max_item_size,
const int has_overwrite_protection)
{
double start_time, end_time;
double qps;
m_open(cache, use_shm, items_count, hot_items_count, max_item_size,
has_overwrite_protection);
printf("simple_ops(requests=%zu, items=%zu, "
"hot_items=%zu, max_item_size=%zu, has_overwrite_protection=%d, use_shm=%d)\n",
requests_count, items_count, hot_items_count, max_item_size,
has_overwrite_protection, use_shm);
start_time = p_get_current_time();
simple_get_miss(cache, requests_count, items_count);
end_time = p_get_current_time();
qps = requests_count / (end_time - start_time) * 1000;
printf(" get_miss : %.02f qps\n", qps);
start_time = p_get_current_time();
simple_set(cache, requests_count, items_count, max_item_size);
end_time = p_get_current_time();
qps = requests_count / (end_time - start_time) * 1000;
printf(" set : %.02f qps\n", qps);
const size_t get_items_count = hot_items_count ? hot_items_count :
items_count;
if (has_overwrite_protection) {
start_time = p_get_current_time();
simple_get_hit(cache, requests_count, get_items_count, max_item_size);
end_time = p_get_current_time();
qps = requests_count / (end_time - start_time) * 1000;
printf(" get_hit : %.02f qps\n", qps);
}
ybc_clear(cache);
start_time = p_get_current_time();
simple_set_simple(cache, requests_count, items_count, max_item_size);
end_time = p_get_current_time();
qps = requests_count / (end_time - start_time) * 1000;
printf(" set_simple : %.02f qps\n", qps);
start_time = p_get_current_time();
simple_get_simple_hit(cache, requests_count, get_items_count, max_item_size);
end_time = p_get_current_time();
qps = requests_count / (end_time - start_time) * 1000;
printf(" get_simple_hit : %.02f qps\n", qps);
m_close(cache, use_shm);
}
struct thread_task
{
struct p_lock lock;
struct ybc *cache;
size_t requests_count;
size_t items_count;
size_t get_items_count;
size_t max_item_size;
};
static size_t get_batch_requests_count(struct thread_task *const task)
{
static const size_t batch_requests_count = 10000;
size_t requests_count = batch_requests_count;
p_lock_lock(&task->lock);
if (task->requests_count < batch_requests_count) {
requests_count = task->requests_count;
}
task->requests_count -= requests_count;
p_lock_unlock(&task->lock);
return requests_count;
}
static void thread_func_set(void *const ctx)
{
struct thread_task *const task = ctx;
for (;;) {
const size_t requests_count = get_batch_requests_count(task);
if (requests_count == 0) {
break;
}
simple_set(task->cache, requests_count, task->items_count,
task->max_item_size);
}
}
static void thread_func_get_miss(void *const ctx)
{
struct thread_task *const task = ctx;
for (;;) {
const size_t requests_count = get_batch_requests_count(task);
if (requests_count == 0) {
break;
}
simple_get_miss(task->cache, requests_count, task->get_items_count);
}
}
static void thread_func_get_hit(void *const ctx)
{
struct thread_task *const task = ctx;
for (;;) {
const size_t requests_count = get_batch_requests_count(task);
if (requests_count == 0) {
break;
}
simple_get_hit(task->cache, requests_count, task->get_items_count,
task->max_item_size);
}
}
static void thread_func_set_get(void *const ctx)
{
struct thread_task *const task = ctx;
for (;;) {
const size_t requests_count = get_batch_requests_count(task);
if (requests_count == 0) {
break;
}
const size_t set_requests_count = (size_t)(requests_count * 0.1);
const size_t get_requests_count = requests_count - set_requests_count;
simple_set(task->cache, set_requests_count, task->items_count,
task->max_item_size);
simple_get_hit(task->cache, get_requests_count, task->get_items_count,
task->max_item_size);
}
}
static void thread_func_set_simple(void *const ctx)
{
struct thread_task *const task = ctx;
for (;;) {
const size_t requests_count = get_batch_requests_count(task);
if (requests_count == 0) {
break;
}
simple_set_simple(task->cache, requests_count, task->items_count,
task->max_item_size);
}
}
static void thread_func_get_simple_hit(void *const ctx)
{
struct thread_task *const task = ctx;
for (;;) {
const size_t requests_count = get_batch_requests_count(task);
if (requests_count == 0) {
break;
}
simple_get_simple_hit(task->cache, requests_count, task->get_items_count,
task->max_item_size);
}
}
static double measure_qps(struct thread_task *const task,
const p_thread_func thread_func, const size_t threads_count,
const size_t requests_count)
{
struct p_thread threads[threads_count];
task->requests_count = requests_count;
double start_time = p_get_current_time();
for (size_t i = 0; i < threads_count; ++i) {
p_thread_init_and_start(&threads[i], thread_func, task);
}
for (size_t i = 0; i < threads_count; ++i) {
p_thread_join_and_destroy(&threads[i]);
}
double end_time = p_get_current_time();
return requests_count / (end_time - start_time) * 1000;
}
static void measure_multithreaded_ops(struct ybc *const cache,
const int use_shm,
const size_t threads_count, const size_t requests_count,
const size_t items_count, const size_t hot_items_count,
const size_t max_item_size, const int has_overwrite_protection)
{
double qps;
m_open(cache, use_shm, items_count, hot_items_count, max_item_size,
has_overwrite_protection);
struct thread_task task = {
.cache = cache,
.items_count = items_count,
.get_items_count = hot_items_count ? hot_items_count : items_count,
.max_item_size = max_item_size,
};
p_lock_init(&task.lock);
printf("multithreaded_ops(requests=%zu, items=%zu, hot_items=%zu, "
"max_item_size=%zu, threads=%zu, has_overwrite_protection=%d, use_shm=%d)\n",
requests_count, items_count, hot_items_count, max_item_size,
threads_count, has_overwrite_protection, use_shm);
qps = measure_qps(&task, thread_func_get_miss, threads_count, requests_count);
printf(" get_miss : %.2f qps\n", qps);
qps = measure_qps(&task, thread_func_set, threads_count, requests_count);
printf(" set : %.2f qps\n", qps);
if (has_overwrite_protection) {
qps = measure_qps(&task, thread_func_get_hit, threads_count,
requests_count);
printf(" get_hit : %.2f qps\n", qps);
qps = measure_qps(&task, thread_func_set_get, threads_count,
requests_count);
printf(" get_set : %.2f qps\n", qps);
}
ybc_clear(cache);
qps = measure_qps(&task, thread_func_set_simple, threads_count,
requests_count);
printf(" set_simple : %.2f qps\n", qps);
qps = measure_qps(&task, thread_func_get_simple_hit, threads_count,
requests_count);
printf(" get_simple_hit : %.2f qps\n", qps);
p_lock_destroy(&task.lock);
m_close(cache, use_shm);
}
int main(void)
{
char cache_buf[ybc_get_size()];
struct ybc *const cache = (struct ybc *)cache_buf;
const size_t requests_count = 4 * 1000 * 1000;
const size_t items_count = 200 * 1000;
for (size_t max_item_size = 8; max_item_size <= 4096; max_item_size *= 2) {
measure_simple_ops(cache, 0, requests_count, items_count, 0, max_item_size, 0);
measure_simple_ops(cache, 0, requests_count, items_count, 0, max_item_size, 1);
measure_simple_ops(cache, 1, requests_count, items_count, 0, max_item_size, 0);
measure_simple_ops(cache, 1, requests_count, items_count, 0, max_item_size, 1);
for (size_t hot_items_count = 1000; hot_items_count <= items_count;
hot_items_count *= 10) {
measure_simple_ops(cache, 0, requests_count, items_count, hot_items_count, max_item_size, 0);
measure_simple_ops(cache, 0, requests_count, items_count, hot_items_count, max_item_size, 1);
measure_simple_ops(cache, 1, requests_count, items_count, hot_items_count, max_item_size, 0);
measure_simple_ops(cache, 1, requests_count, items_count, hot_items_count, max_item_size, 1);
}
for (size_t threads_count = 1; threads_count <= 16; threads_count *= 2) {
measure_multithreaded_ops(cache, 0, threads_count, requests_count, items_count, 10 * 1000, max_item_size, 0);
measure_multithreaded_ops(cache, 0, threads_count, requests_count, items_count, 10 * 1000, max_item_size, 1);
measure_multithreaded_ops(cache, 1, threads_count, requests_count, items_count, 10 * 1000, max_item_size, 0);
measure_multithreaded_ops(cache, 1, threads_count, requests_count, items_count, 10 * 1000, max_item_size, 1);
}
}
printf("All performance tests done\n");
return 0;
}