Deprecated tbb::task_scheduler_init replaced with std::thread and tbb::global_control

src/contractor/contractor.cpp

@@ -36,7 +36,12 @@
 
 #include <boost/assert.hpp>
 
+#if TBB_VERSION_MAJOR == 2020
+#include <tbb/global_control.h>
+#else
 #include <tbb/task_scheduler_init.h>
+#endif
+
 namespace osrm
 {
 namespace contractor
@@ -44,8 +49,13 @@ namespace contractor
 
 int Contractor::Run()
 {
+#if TBB_VERSION_MAJOR == 2020
+    tbb::global_control gc(tbb::global_control::max_allowed_parallelism,
+                           config.requested_num_threads);
+#else
     tbb::task_scheduler_init init(config.requested_num_threads);
     BOOST_ASSERT(init.is_active());
+#endif
 
     if (config.core_factor != 1.0)
     {

src/customize/customizer.cpp

@@ -21,7 +21,11 @@
 
 #include <boost/assert.hpp>
 
+#if TBB_VERSION_MAJOR == 2020
+#include <tbb/global_control.h>
+#else
 #include <tbb/task_scheduler_init.h>
+#endif
 
 namespace osrm
 {
@@ -118,8 +122,13 @@ std::vector<CellMetric> customizeFilteredMetrics(const partitioner::MultiLevelEd
 
 int Customizer::Run(const CustomizationConfig &config)
 {
+#if TBB_VERSION_MAJOR == 2020
+    tbb::global_control gc(tbb::global_control::max_allowed_parallelism,
+                           config.requested_num_threads);
+#else
     tbb::task_scheduler_init init(config.requested_num_threads);
     BOOST_ASSERT(init.is_active());
+#endif
 
     TIMER_START(loading_data);
 

src/extractor/edge_based_graph_factory.cpp

@@ -31,13 +31,13 @@
 #include <limits>
 #include <sstream>
 #include <string>
+#include <thread>
 #include <tuple>
 #include <unordered_map>
 
 #include <tbb/blocked_range.h>
 #include <tbb/parallel_for.h>
 #include <tbb/pipeline.h>
-#include <tbb/task_scheduler_init.h>
 
 namespace std
 {
@@ -1080,7 +1080,7 @@ void EdgeBasedGraphFactory::GenerateEdgeExpandedEdges(
         // to be balanced with the GRAINSIZE above - ideally, the pipeline puts as much work
         // as possible in the `intersection_handler` step so that those parallel workers don't
         // get blocked too much by the slower (io-performing) `buffer_storage`
-        tbb::parallel_pipeline(tbb::task_scheduler_init::default_num_threads() * 5,
+        tbb::parallel_pipeline(std::thread::hardware_concurrency() * 5,
                                generator_stage & processor_stage & output_stage);
 
         // NOTE: buffer.delayed_data and buffer.delayed_turn_data have the same index

src/extractor/extractor.cpp

@@ -55,8 +55,12 @@
 #include <osmium/thread/pool.hpp>
 #include <osmium/visitor.hpp>
 
-#include <tbb/pipeline.h>
+#if TBB_VERSION_MAJOR == 2020
+#include <tbb/global_control.h>
+#else
 #include <tbb/task_scheduler_init.h>
+#endif
+#include <tbb/pipeline.h>
 
 #include <cstdlib>
 
@@ -214,11 +218,16 @@ int Extractor::run(ScriptingEnvironment &scripting_environment)
 {
     util::LogPolicy::GetInstance().Unmute();
 
-    const unsigned recommended_num_threads = tbb::task_scheduler_init::default_num_threads();
+    const unsigned recommended_num_threads = std::thread::hardware_concurrency();
     const auto number_of_threads = std::min(recommended_num_threads, config.requested_num_threads);
-    tbb::task_scheduler_init init(number_of_threads ? number_of_threads
-                                                    : tbb::task_scheduler_init::automatic);
+
+#if TBB_VERSION_MAJOR == 2020
+    tbb::global_control gc(tbb::global_control::max_allowed_parallelism,
+                           config.requested_num_threads);
+#else
+    tbb::task_scheduler_init init(config.requested_num_threads);
     BOOST_ASSERT(init.is_active());
+#endif
 
     LaneDescriptionMap turn_lane_map;
     std::vector<TurnRestriction> turn_restrictions;
@@ -604,7 +613,7 @@ Extractor::ParseOSMData(ScriptingEnvironment &scripting_environment,
 
     // Parse OSM elements with parallel transformer
     // Number of pipeline tokens that yielded the best speedup was about 1.5 * num_cores
-    const auto num_threads = tbb::task_scheduler_init::default_num_threads() * 1.5;
+    const auto num_threads = std::thread::hardware_concurrency() * 1.5;
     const auto read_meta =
         config.use_metadata ? osmium::io::read_meta::yes : osmium::io::read_meta::no;
 

src/guidance/guidance_processing.cpp

@@ -10,7 +10,8 @@
 
 #include <tbb/blocked_range.h>
 #include <tbb/pipeline.h>
-#include <tbb/task_scheduler_init.h>
+
+#include <thread>
 
 namespace osrm
 {
@@ -324,7 +325,7 @@ void annotateTurns(const util::NodeBasedDynamicGraph &node_based_graph,
         // to be balanced with the GRAINSIZE above - ideally, the pipeline puts as much work
         // as possible in the `intersection_handler` step so that those parallel workers don't
         // get blocked too much by the slower (io-performing) `buffer_storage`
-        tbb::parallel_pipeline(tbb::task_scheduler_init::default_num_threads() * 5,
+        tbb::parallel_pipeline(std::thread::hardware_concurrency() * 5,
                                generator_stage & guidance_stage & guidance_output_stage);
 
         // NOTE: EBG edges delayed_data and turns delayed_turn_data have the same index

src/partitioner/partitioner.cpp

@@ -28,7 +28,11 @@
 #include <boost/assert.hpp>
 #include <boost/filesystem/operations.hpp>
 
+#if TBB_VERSION_MAJOR == 2020
+#include <tbb/global_control.h>
+#else
 #include <tbb/task_scheduler_init.h>
+#endif
 
 #include "util/geojson_debug_logger.hpp"
 #include "util/geojson_debug_policies.hpp"
@@ -70,8 +74,13 @@ auto getGraphBisection(const PartitionerConfig &config)
 
 int Partitioner::Run(const PartitionerConfig &config)
 {
+#if TBB_VERSION_MAJOR == 2020
+    tbb::global_control gc(tbb::global_control::max_allowed_parallelism,
+                           config.requested_num_threads);
+#else
     tbb::task_scheduler_init init(config.requested_num_threads);
     BOOST_ASSERT(init.is_active());
+#endif
 
     const std::vector<BisectionID> &node_based_partition_ids = getGraphBisection(config);
 

src/tools/contract.cpp

@@ -10,12 +10,11 @@
 #include <boost/program_options.hpp>
 #include <boost/program_options/errors.hpp>
 
-#include <tbb/task_scheduler_init.h>
-
 #include <cstdlib>
 #include <exception>
 #include <new>
 #include <ostream>
+#include <thread>
 
 #include "util/meminfo.hpp"
 
@@ -45,7 +44,7 @@ return_code parseArguments(int argc,
     config_options.add_options()(
         "threads,t",
         boost::program_options::value<unsigned int>(&contractor_config.requested_num_threads)
-            ->default_value(tbb::task_scheduler_init::default_num_threads()),
+            ->default_value(std::thread::hardware_concurrency()),
         "Number of threads to use")(
         "core,k",
         boost::program_options::value<double>(&contractor_config.core_factor)->default_value(1.0),
@@ -171,7 +170,7 @@ int main(int argc, char *argv[]) try
         return EXIT_FAILURE;
     }
 
-    const unsigned recommended_num_threads = tbb::task_scheduler_init::default_num_threads();
+    const unsigned recommended_num_threads = std::thread::hardware_concurrency();
 
     if (recommended_num_threads != contractor_config.requested_num_threads)
     {

src/tools/customize.cpp

@@ -5,12 +5,11 @@
 #include "util/meminfo.hpp"
 #include "util/version.hpp"
 
-#include <tbb/task_scheduler_init.h>
-
 #include <boost/filesystem.hpp>
 #include <boost/program_options.hpp>
 
 #include <iostream>
+#include <thread>
 
 using namespace osrm;
 
@@ -39,7 +38,7 @@ return_code parseArguments(int argc,
         //
         ("threads,t",
          boost::program_options::value<unsigned int>(&customization_config.requested_num_threads)
-             ->default_value(tbb::task_scheduler_init::default_num_threads()),
+             ->default_value(std::thread::hardware_concurrency()),
          "Number of threads to use")(
             "segment-speed-file",
             boost::program_options::value<std::vector<std::string>>(

src/tools/extract.cpp

@@ -4,14 +4,13 @@
 #include "util/log.hpp"
 #include "util/version.hpp"
 
-#include <tbb/task_scheduler_init.h>
-
 #include <boost/filesystem.hpp>
 #include <boost/program_options.hpp>
 
 #include <cstdlib>
 #include <exception>
 #include <new>
+#include <thread>
 
 #include "util/meminfo.hpp"
 
@@ -49,7 +48,7 @@ return_code parseArguments(int argc,
         "Data version. Leave blank to avoid. osmosis - to get timestamp from file")(
         "threads,t",
         boost::program_options::value<unsigned int>(&extractor_config.requested_num_threads)
-            ->default_value(tbb::task_scheduler_init::default_num_threads()),
+            ->default_value(std::thread::hardware_concurrency()),
         "Number of threads to use")(
         "small-component-size",
         boost::program_options::value<unsigned int>(&extractor_config.small_component_size)

src/tools/partition.cpp

@@ -7,8 +7,6 @@
 #include "util/timing_util.hpp"
 #include "util/version.hpp"
 
-#include <tbb/task_scheduler_init.h>
-
 #include <boost/algorithm/string/join.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/program_options.hpp>
@@ -17,6 +15,7 @@
 #include <iostream>
 #include <iterator>
 #include <regex>
+#include <thread>
 
 using namespace osrm;
 
@@ -86,7 +85,7 @@ return_code parseArguments(int argc,
         //
         ("threads,t",
          boost::program_options::value<unsigned int>(&config.requested_num_threads)
-             ->default_value(tbb::task_scheduler_init::default_num_threads()),
+             ->default_value(std::thread::hardware_concurrency()),
          "Number of threads to use")
         //
         ("balance",