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/* Copyright (c) 2017, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/*
We do benchmark test of character set loader below.
1. Load a collation. This happens in query like 'SELECT a FROM tbl ORDER BY
a COLLATE coll_name'. 'coll_name' is the name of collation which is used
to do ordering, like 'latin1_swedish_ci'.
2. Load a character set. In MySQL, when you ask for a 'character set', you
actually get a collation. For example, when executing 'SELECT _utf16
0x0100'. MySQL uses the pointer to collation 'utf16_general_ci' to handle
this character.
*/
#include <gtest/gtest.h>
#include <thread>
#include <vector>
#include "m_ctype.h"
#include "my_sys.h"
#include "unittest/gunit/benchmark.h"
namespace collation_loader_unittest {
namespace {
CHARSET_INFO *lookup_collation(const char *name) {
MY_CHARSET_LOADER loader;
return my_collation_get_by_name(&loader, name, MYF(0));
}
CHARSET_INFO *lookup_charset(const char *name, int flag) {
MY_CHARSET_LOADER loader;
return my_charset_get_by_name(&loader, name, flag, MYF(0));
}
} // namespace
static void BM_LookupAllCollations(size_t num_iterations) {
StopBenchmarkTiming();
// Look up one collation to initialize the all_charsets array.
lookup_collation("latin1_swedish_ci");
size_t num_charsets = array_elements(all_charsets);
StartBenchmarkTiming();
for (size_t i = 0; i < num_iterations; i++) {
const CHARSET_INFO *cs = all_charsets[i % num_charsets];
if (cs) {
EXPECT_NE(lookup_collation(cs->m_coll_name), nullptr);
}
}
}
BENCHMARK(BM_LookupAllCollations)
static std::vector<std::string> charsets = {
"armscii8", "ascii", "big5", "binary", "cp1250", "cp1251",
"cp1256", "cp1257", "cp850", "cp852", "cp866", "cp932",
"dec8", "eucjpms", "euckr", "gb18030", "gb2312", "gbk",
"geostd8", "greek", "hebrew", "hp8", "keybcs2", "koi8r",
"koi8u", "latin1", "latin2", "latin5", "latin7", "macce",
"macroman", "sjis", "swe7", "tis620", "ucs2", "ujis",
"utf16", "utf16le", "utf32", "utf8", "utf8mb4",
};
static void BM_LookupAllCharsets(size_t num_iterations) {
StopBenchmarkTiming();
// Look up one collation to initialize the all_charsets array.
lookup_collation("latin1_swedish_ci");
StartBenchmarkTiming();
for (size_t i = 0; i < num_iterations; i++) {
const std::string &charset = charsets[i % charsets.size()];
EXPECT_NE(lookup_charset(charset.c_str(), MY_CS_PRIMARY), nullptr);
EXPECT_NE(lookup_charset(charset.c_str(), MY_CS_BINSORT), nullptr);
}
}
BENCHMARK(BM_LookupAllCharsets)
void TestRandomCollation() {
char coll_name[65];
for (int ix = 0; ix < 100000; ix++) {
memset(coll_name, 0, 65);
// Generate a random collation name whose length is in range [1, 64].
size_t random_coll_name_len = 1 + rand() % 64;
for (size_t i = 0; i < random_coll_name_len; i++) {
// Use ASCII latin letters to generate the name.
coll_name[i] = 'a' + rand() % 26;
}
int rc = get_collation_number(coll_name);
// Random collation that doesn't exist should return 0.
EXPECT_EQ(0, rc);
}
}
TEST(CollationLoaderTest, RandomCollation) {
// Look up one collation to initialize the all_charsets array.
lookup_collation("latin1_swedish_ci");
std::thread test_thd[4];
for (int i = 0; i < 4; i++) test_thd[i] = std::thread(TestRandomCollation);
for (int i = 0; i < 4; i++) test_thd[i].join();
}
} // namespace collation_loader_unittest
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