Expose new --mmap switch (use_mmap in NodeJS), and run test suite in this mode, as well as shared mem mode.

include/engine/engine.hpp

@@ -63,12 +63,16 @@ template <typename Algorithm> class Engine final : public EngineInterface
                                 << "\" with algorithm " << routing_algorithms::name<Algorithm>();
             facade_provider = std::make_unique<WatchingProvider<Algorithm>>(config.dataset_name);
         }
-        else if (!config.memory_file.empty())
+        else if (!config.memory_file.empty() || config.use_mmap)
         {
-            util::Log(logDEBUG) << "Using memory mapped filed at " << config.memory_file
-                                << " with algorithm " << routing_algorithms::name<Algorithm>();
-            facade_provider = std::make_unique<ExternalProvider<Algorithm>>(config.storage_config,
-                                                                            config.memory_file);
+            if (!config.memory_file.empty())
+            {
+                util::Log(logWARNING)
+                    << "The 'memory_file' option is DEPRECATED - using direct mmaping instead";
+            }
+            util::Log(logDEBUG) << "Using direct memory mapping with algorithm "
+                                << routing_algorithms::name<Algorithm>();
+            facade_provider = std::make_unique<ExternalProvider<Algorithm>>(config.storage_config);
         }
         else
         {
@@ -134,7 +138,7 @@ template <typename Algorithm> class Engine final : public EngineInterface
     const plugins::MatchPlugin match_plugin;
     const plugins::TilePlugin tile_plugin;
 };
-}
-}
+} // namespace engine
+} // namespace osrm
 
 #endif // OSRM_IMPL_HPP

include/engine/engine_config.hpp

@@ -89,11 +89,12 @@ struct EngineConfig final
     int max_alternatives = 3; // set an arbitrary upper bound; can be adjusted by user
     bool use_shared_memory = true;
     boost::filesystem::path memory_file;
+    bool use_mmap = true;
     Algorithm algorithm = Algorithm::CH;
     std::string verbosity;
     std::string dataset_name;
 };
-}
-}
+} // namespace engine
+} // namespace osrm
 
 #endif // SERVER_CONFIG_HPP

include/nodejs/node_osrm_support.hpp

@@ -142,6 +142,10 @@ inline engine_config_ptr argumentsToEngineConfig(const Nan::FunctionCallbackInfo
     if (shared_memory.IsEmpty())
         return engine_config_ptr();
 
+    auto mmap_memory = params->Get(Nan::New("mmap_memory").ToLocalChecked());
+    if (mmap_memory.IsEmpty())
+        return engine_config_ptr();
+
     if (!memory_file->IsUndefined())
     {
         if (path->IsUndefined())
@@ -190,6 +194,18 @@ inline engine_config_ptr argumentsToEngineConfig(const Nan::FunctionCallbackInfo
             return engine_config_ptr();
         }
     }
+    if (!mmap_memory->IsUndefined())
+    {
+        if (mmap_memory->IsBoolean())
+        {
+            engine_config->use_mmap = Nan::To<bool>(mmap_memory).FromJust();
+        }
+        else
+        {
+            Nan::ThrowError("mmap_memory option must be a boolean");
+            return engine_config_ptr();
+        }
+    }
 
     if (path->IsUndefined() && !engine_config->use_shared_memory)
     {