Replaced Mersenne Twister to PCG-Random [#CLICKHOUSE-2].

dbms/CMakeLists.txt

@@ -206,6 +206,7 @@ target_link_libraries (dbms
 target_include_directories (dbms BEFORE PRIVATE ${DIVIDE_INCLUDE_DIR})
 target_include_directories (dbms BEFORE PRIVATE ${SPARCEHASH_INCLUDE_DIR})
 target_include_directories (dbms PUBLIC ${DBMS_INCLUDE_DIR})
+target_include_directories (dbms PUBLIC ${PCG_RANDOM_INCLUDE_DIR})
 
 # only for copy_headers.sh:
 target_include_directories (dbms PRIVATE ${COMMON_INCLUDE_DIR})

dbms/src/AggregateFunctions/CMakeLists.txt

@@ -29,4 +29,3 @@ list(REMOVE_ITEM clickhouse_aggregate_functions_headers
 add_library(clickhouse_aggregate_functions ${clickhouse_aggregate_functions_sources})
 target_link_libraries(clickhouse_aggregate_functions dbms)
 target_include_directories (clickhouse_aggregate_functions PRIVATE ${COMMON_INCLUDE_DIR})
-target_include_directories (clickhouse_aggregate_functions PRIVATE ${PCG_RANDOM_INCLUDE_DIR})

dbms/src/Common/ArrayCache.h

@@ -5,6 +5,7 @@
 #include <list>
 #include <memory>
 #include <random>
+#include <pcg_random.hpp>
 #include <unordered_map>
 #include <sys/mman.h>
 #include <boost/intrusive/list.hpp>
@@ -160,7 +161,7 @@ private:
 
     mutable std::mutex mutex;
 
-    std::mt19937_64 rng {static_cast<std::mt19937_64::result_type>(randomSeed())};
+    pcg64 rng{randomSeed()};
 
     struct Chunk : private boost::noncopyable
     {

dbms/src/Common/ZooKeeper/ZooKeeper.cpp

@@ -1,9 +1,11 @@
 #include <random>
+#include <pcg_random.hpp>
 #include <functional>
 #include <Common/ZooKeeper/ZooKeeper.h>
 #include <common/logger_useful.h>
 #include <Common/ProfileEvents.h>
 #include <Common/StringUtils.h>
+#include <Common/randomSeed.h>
 
 
 namespace ProfileEvents
@@ -137,9 +139,8 @@ struct ZooKeeperArgs
         }
 
         /// Shuffle the hosts to distribute the load among ZooKeeper nodes.
-        std::random_device rd;
+        pcg64 rng(randomSeed());
-        std::mt19937 g(rd());
+        std::shuffle(hosts_strings.begin(), hosts_strings.end(), rng);
-        std::shuffle(hosts_strings.begin(), hosts_strings.end(), g);
 
         for (auto & host : hosts_strings)
         {

dbms/src/Common/tests/array_cache.cpp

@@ -1,6 +1,7 @@
 #include <iostream>
 #include <cstring>
 #include <thread>
+#include <pcg_random.hpp>
 #include <Common/ArrayCache.h>
 #include <IO/ReadHelpers.h>
 
@@ -51,7 +52,7 @@ int main(int argc, char ** argv)
     {
         threads.emplace_back([&]
         {
-            std::mt19937 generator(randomSeed());
+            pcg64 generator(randomSeed());
 
             for (size_t i = 0; i < num_iterations; ++i)
             {

dbms/src/Common/tests/gtest_rw_lock_fifo.cpp.cpp

@@ -4,6 +4,7 @@
 #include <common/Types.h>
 #include <common/ThreadPool.h>
 #include <random>
+#include <pcg_random.hpp>
 #include <thread>
 #include <atomic>
 #include <iomanip>
@@ -23,7 +24,7 @@ TEST(Common, RWLockFIFO_1)
     static auto fifo_lock = RWLockFIFO::create();
 
     static thread_local std::random_device rd;
-    static thread_local std::mt19937 gen(rd());
+    static thread_local pcg64 gen(rd());
 
     auto func = [&] (size_t threads, int round) {
         for (int  i = 0; i < cycles; ++i)
@@ -85,7 +86,7 @@ TEST(Common, RWLockFIFO_Recursive)
     static auto fifo_lock = RWLockFIFO::create();
 
     static thread_local std::random_device rd;
-    static thread_local std::mt19937 gen(rd());
+    static thread_local pcg64 gen(rd());
 
     std::thread t1([&] () {
         for (int i = 0; i < 2 * cycles; ++i)
@@ -106,7 +107,7 @@ TEST(Common, RWLockFIFO_Recursive)
             std::this_thread::sleep_for(sleep_for);
 
             auto lock2 = fifo_lock->getLock(RWLockFIFO::Read);
-            
+
             EXPECT_ANY_THROW({fifo_lock->getLock(RWLockFIFO::Write);});
         }
 

dbms/src/DataStreams/narrowBlockInputStreams.cpp

@@ -1,4 +1,5 @@
 #include <random>
+#include <pcg_random.hpp>
 #include <Common/randomSeed.h>
 #include <DataStreams/ConcatBlockInputStream.h>
 
@@ -20,7 +21,7 @@ BlockInputStreams narrowBlockInputStreams(BlockInputStreams & inputs, size_t wid
     for (size_t i = 0; i < size; ++i)
         distribution[i] = i % width;
 
-    std::mt19937 generator(randomSeed());
+    pcg64 generator(randomSeed());
     std::shuffle(distribution.begin(), distribution.end(), generator);
 
     for (size_t i = 0; i < size; ++i)

dbms/src/Dictionaries/CacheDictionary.cpp

@@ -68,7 +68,7 @@ CacheDictionary::CacheDictionary(const std::string & name, const DictionaryStruc
         size{roundUpToPowerOfTwoOrZero(std::max(size, size_t(max_collision_length)))},
         size_overlap_mask{this->size - 1},
         cells{this->size},
-        rnd_engine{randomSeed()}
+        rnd_engine(randomSeed())
 {
     if (!this->source_ptr->supportsSelectiveLoad())
         throw Exception{

dbms/src/Dictionaries/CacheDictionary.h

@@ -13,7 +13,7 @@
 #include <vector>
 #include <map>
 #include <tuple>
-#include <random>
+#include <pcg_random.hpp>
 #include <shared_mutex>
 
 
@@ -260,7 +260,7 @@ private:
     Attribute * hierarchical_attribute = nullptr;
     std::unique_ptr<ArenaWithFreeLists> string_arena;
 
-    mutable std::mt19937_64 rnd_engine;
+    mutable pcg64 rnd_engine;
 
     mutable size_t bytes_allocated = 0;
     mutable std::atomic<size_t> element_count{0};

dbms/src/Dictionaries/ComplexKeyCacheDictionary.cpp

@@ -57,7 +57,7 @@ ComplexKeyCacheDictionary::ComplexKeyCacheDictionary(const std::string & name, c
     : name{name}, dict_struct(dict_struct), source_ptr{std::move(source_ptr)}, dict_lifetime(dict_lifetime),
     size{roundUpToPowerOfTwoOrZero(std::max(size, size_t(max_collision_length)))},
     size_overlap_mask{this->size - 1},
-    rnd_engine{randomSeed()}
+    rnd_engine(randomSeed())
 {
     if (!this->source_ptr->supportsSelectiveLoad())
         throw Exception{

dbms/src/Dictionaries/ComplexKeyCacheDictionary.h

@@ -3,7 +3,6 @@
 #include <atomic>
 #include <chrono>
 #include <map>
-#include <random>
 #include <tuple>
 #include <vector>
 #include <shared_mutex>
@@ -19,6 +18,7 @@
 #include <ext/bit_cast.h>
 #include <ext/map.h>
 #include <ext/scope_guard.h>
+#include <pcg_random.hpp>
 
 
 namespace ProfileEvents
@@ -721,7 +721,7 @@ private:
     std::unique_ptr<SmallObjectPool> fixed_size_keys_pool = key_size_is_fixed ? std::make_unique<SmallObjectPool>(key_size) : nullptr;
     std::unique_ptr<ArenaWithFreeLists> string_arena;
 
-    mutable std::mt19937_64 rnd_engine;
+    mutable pcg64 rnd_engine;
 
     mutable size_t bytes_allocated = 0;
     mutable std::atomic<size_t> element_count{0};

dbms/src/Interpreters/Context.cpp

@@ -1,6 +1,5 @@
 #include <map>
 #include <set>
-#include <random>
 
 #include <boost/functional/hash/hash.hpp>
 #include <Poco/Mutex.h>
@@ -9,6 +8,7 @@
 #include <Poco/Net/IPAddress.h>
 
 #include <common/logger_useful.h>
+#include <pcg_random.hpp>
 
 #include <Common/Macros.h>
 #include <Common/escapeForFileName.h>
@@ -175,7 +175,7 @@ struct ContextShared
 
     Context::ApplicationType application_type = Context::ApplicationType::SERVER;
 
-    std::mt19937_64 rng{randomSeed()};
+    pcg64 rng{randomSeed()};
 
     ContextShared()
     {

dbms/src/Interpreters/DDLWorker.cpp

@@ -21,6 +21,7 @@
 #include <Common/getFQDNOrHostName.h>
 #include <Common/setThreadName.h>
 #include <Common/Stopwatch.h>
+#include <Common/randomSeed.h>
 
 #include <DataTypes/DataTypesNumber.h>
 #include <DataTypes/DataTypeString.h>
@@ -34,6 +35,9 @@
 #include <Common/isLocalAddress.h>
 #include <Poco/Timestamp.h>
 
+#include <random>
+#include <pcg_random.hpp>
+
 
 namespace DB
 {
@@ -655,7 +659,7 @@ void DDLWorker::processTaskAlter(
         bool alter_executed_by_any_replica = false;
         {
             auto lock = createSimpleZooKeeperLock(zookeeper, shard_path, "lock", task.host_id_str);
-            std::mt19937 rng(StringRefHash{}(task.host_id_str) + reinterpret_cast<intptr_t>(&rng));
+            pcg64 rng(randomSeed());
 
             for (int num_tries = 0; num_tries < 10; ++num_tries)
             {

dbms/src/Interpreters/ExternalDictionaries.h

@@ -13,7 +13,8 @@
 #include <thread>
 #include <unordered_map>
 #include <chrono>
-#include <random>
+#include <pcg_random.hpp>
+
 
 namespace DB
 {
@@ -74,7 +75,7 @@ private:
       */
     std::unordered_map<std::string, std::chrono::system_clock::time_point> update_times;
 
-    std::mt19937_64 rnd_engine{randomSeed()};
+    pcg64 rnd_engine{randomSeed()};
 
     Context & context;
 

dbms/src/Interpreters/Quota.cpp

@@ -8,6 +8,7 @@
 #include <Interpreters/Quota.h>
 
 #include <set>
+#include <random>
 
 
 namespace DB
@@ -159,7 +160,7 @@ void QuotaForInterval::check(
 }
 
 
-void QuotaForIntervals::initFromConfig(const String & config_elem, Poco::Util::AbstractConfiguration & config, std::mt19937 & rng)
+void QuotaForIntervals::initFromConfig(const String & config_elem, Poco::Util::AbstractConfiguration & config, pcg64 & rng)
 {
     Poco::Util::AbstractConfiguration::Keys config_keys;
     config.keys(config_elem, config_keys);
@@ -250,7 +251,7 @@ String QuotaForIntervals::toString() const
 }
 
 
-void Quota::loadFromConfig(const String & config_elem, const String & name_, Poco::Util::AbstractConfiguration & config, std::mt19937 & rng)
+void Quota::loadFromConfig(const String & config_elem, const String & name_, Poco::Util::AbstractConfiguration & config, pcg64 & rng)
 {
     name = name_;
 
@@ -308,7 +309,7 @@ QuotaForIntervalsPtr Quota::get(const String & quota_key, const String & user_na
 
 void Quotas::loadFromConfig(Poco::Util::AbstractConfiguration & config)
 {
-    std::mt19937 rng;
+    pcg64 rng;
 
     Poco::Util::AbstractConfiguration::Keys config_keys;
     config.keys("quotas", config_keys);

dbms/src/Interpreters/Quota.h

@@ -3,7 +3,7 @@
 #include <cstring>
 #include <unordered_map>
 #include <memory>
-#include <random>
+#include <pcg_random.hpp>
 
 #include <Poco/Timespan.h>
 
@@ -191,7 +191,7 @@ public:
         return cont.empty();
     }
 
-    void initFromConfig(const String & config_elem, Poco::Util::AbstractConfiguration & config, std::mt19937 & rng);
+    void initFromConfig(const String & config_elem, Poco::Util::AbstractConfiguration & config, pcg64 & rng);
 
     /// Set maximum values (limits) from passed argument.
     /// Remove intervals that does not exist in argument. Add intervals from argument, that we don't have.
@@ -241,7 +241,7 @@ struct Quota
 
     bool keyed_by_ip = false;
 
-    void loadFromConfig(const String & config_elem, const String & name_, Poco::Util::AbstractConfiguration & config, std::mt19937 & rng);
+    void loadFromConfig(const String & config_elem, const String & name_, Poco::Util::AbstractConfiguration & config, pcg64 & rng);
     QuotaForIntervalsPtr get(const String & quota_key, const String & user_name, const Poco::Net::IPAddress & ip);
 };
 

dbms/src/Server/Benchmark.cpp

@@ -8,6 +8,7 @@
 #include <fstream>
 #include <iomanip>
 #include <random>
+#include <pcg_random.hpp>
 
 #include <Poco/File.h>
 #include <Poco/Util/Application.h>
@@ -230,7 +231,7 @@ private:
 
     void run()
     {
-        std::mt19937 generator(randomSeed());
+        pcg64 generator(randomSeed());
         std::uniform_int_distribution<size_t> distribution(0, queries.size() - 1);
 
         for (size_t i = 0; i < concurrency; ++i)

dbms/src/Storages/MergeTree/BackgroundProcessingPool.cpp

@@ -2,10 +2,12 @@
 #include <Common/setThreadName.h>
 #include <Common/CurrentMetrics.h>
 #include <Common/MemoryTracker.h>
+#include <Common/randomSeed.h>
 #include <IO/WriteHelpers.h>
 #include <common/logger_useful.h>
 #include <Storages/MergeTree/BackgroundProcessingPool.h>
 
+#include <pcg_random.hpp>
 #include <random>
 
 
@@ -115,7 +117,7 @@ void BackgroundProcessingPool::threadFunction()
     memory_tracker.setMetric(CurrentMetrics::MemoryTrackingInBackgroundProcessingPool);
     current_memory_tracker = &memory_tracker;
 
-    std::mt19937 rng(reinterpret_cast<intptr_t>(&rng));
+    pcg64 rng(randomSeed());
     std::this_thread::sleep_for(std::chrono::duration<double>(std::uniform_real_distribution<double>(0, sleep_seconds_random_part)(rng)));
 
     while (!shutdown)

dbms/src/Storages/MergeTree/ReshardingWorker.cpp

@@ -31,11 +31,14 @@
 #include <Poco/DirectoryIterator.h>
 #include <Poco/File.h>
 
+#include <boost/noncopyable.hpp>
+
 #include <future>
 #include <chrono>
 #include <cstdlib>
 #include <ctime>
-#include <random>
+#include <pcg_random.hpp>
+
 
 namespace DB
 {
@@ -1391,19 +1394,8 @@ void ReshardingWorker::executeAttach(LogRecord & log_record)
     /// Description of tasks for each replica of a shard.
     /// For fault tolerance purposes, some fields are provided
     /// to perform attempts on more than one replica if needed.
-    struct ShardTaskInfo
+    struct ShardTaskInfo : private boost::noncopyable
     {
-        ShardTaskInfo()
-        {
-            rng = std::mt19937(randomSeed());
-        }
-
-        ShardTaskInfo(const ShardTaskInfo &) = delete;
-        ShardTaskInfo & operator=(const ShardTaskInfo &) = delete;
-
-        ShardTaskInfo(ShardTaskInfo &&) = default;
-        ShardTaskInfo & operator=(ShardTaskInfo &&) = default;
-
         /// one task for each replica
         std::vector<TaskInfo> shard_tasks;
         /// index to the replica to be used
@@ -1411,7 +1403,7 @@ void ReshardingWorker::executeAttach(LogRecord & log_record)
         /// result of the operation on the current replica
         bool is_success = false;
         /// For pseudo-random number generation.
-        std::mt19937 rng;
+        pcg64 rng{randomSeed()};
     };
 
     const WeightedZooKeeperPath & weighted_path = current_job.paths[log_record.shard_no];

dbms/src/Storages/StorageReplicatedMergeTree.h

@@ -2,7 +2,7 @@
 
 #include <ext/shared_ptr_helper.h>
 #include <atomic>
-#include <random>
+#include <pcg_random.hpp>
 #include <Storages/IStorage.h>
 #include <Storages/MergeTree/MergeTreeData.h>
 #include <Storages/MergeTree/MergeTreeDataMerger.h>
@@ -321,7 +321,7 @@ private:
 
     Logger * log;
 
-    std::mt19937 rng{randomSeed()};
+    pcg64 rng{randomSeed()};
 
     StorageReplicatedMergeTree(
         const String & zookeeper_path_,

utils/iotest/iotest.cpp

@@ -7,12 +7,14 @@
 #include <iomanip>
 #include <vector>
 #include <random>
+#include <pcg_random.hpp>
 
 #include <Poco/NumberParser.h>
 #include <Poco/NumberFormatter.h>
 #include <Poco/Exception.h>
 
 #include <Common/Exception.h>
+#include <Common/randomSeed.h>
 
 #include <common/ThreadPool.h>
 #include <Common/Stopwatch.h>
@@ -50,11 +52,7 @@ void thread(int fd, int mode, size_t min_offset, size_t max_offset, size_t block
     else
         buf = &simple_buf[0];
 
-    std::mt19937 rng;
+    pcg64 rng(randomSeed());
-
-    timespec times;
-    clock_gettime(CLOCK_THREAD_CPUTIME_ID, &times);
-    rng.seed(times.tv_nsec);
 
     for (size_t i = 0; i < count; ++i)
     {

utils/iotest/iotest_nonblock.cpp

@@ -13,12 +13,14 @@
 #include <vector>
 
 #include <random>
+#include <pcg_random.hpp>
 
 #include <Poco/NumberParser.h>
 #include <Poco/NumberFormatter.h>
 #include <Poco/Exception.h>
 
 #include <Common/Exception.h>
+#include <Common/randomSeed.h>
 
 #include <common/ThreadPool.h>
 #include <Common/Stopwatch.h>
@@ -77,11 +79,7 @@ int mainImpl(int argc, char ** argv)
 
     std::vector<char> buf(block_size);
 
-    std::mt19937 rng;
+    pcg64 rng(randomSeed());
-
-    timespec times;
-    clock_gettime(CLOCK_THREAD_CPUTIME_ID, &times);
-    rng.seed(times.tv_nsec);
 
     Stopwatch watch;
 

utils/test-data-generator/main.cpp

@@ -1,5 +1,6 @@
 #include <iostream>
 #include <random>
+#include <pcg_random.hpp>
 #include <cmath>
 
 #include <IO/WriteBufferFromFileDescriptor.h>
@@ -42,8 +43,8 @@ struct Models
 struct Generator
 {
     WriteBufferFromFileDescriptor out;
-    std::mt19937_64 random;
+    pcg64 random;
-    std::mt19937_64 random_with_seed;
+    pcg64 random_with_seed;
     Models models;
 
 //    UInt64 WatchID = random();

utils/test-data-generator/markov-model.cpp

@@ -1,5 +1,6 @@
 #include <iostream>
 #include <random>
+#include <pcg_random.hpp>
 
 #include <boost/program_options.hpp>
 
@@ -47,7 +48,7 @@ try
     ReadBufferFromFileDescriptor in(STDIN_FILENO);
     WriteBufferFromFileDescriptor out(STDOUT_FILENO);
 
-    std::mt19937 random;
+    pcg64 random;
 
     if (options.count("seed"))
         random.seed(options["seed"].as<UInt64>());