Profiling tools

.vscode/launch.json

@@ -172,6 +172,38 @@
                 }
             ]
         },
+        {
+            "name": "(gdb) profilePlugin Launch",
+            "type": "cppdbg",
+            "request": "launch",
+            // Resolved by CMake Tools:
+            "program": "${command:cmake.launchTargetPath}",
+
+            "args": [            "Nam_Profile", "--no-profile","-w" ],
+
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}",
+            "environment": [
+                {
+                    "name": "PATH",
+                    "value": "$PATH:${command:cmake.launchTargetDirectory}"
+                },
+                {
+                    "name": "OTHER_VALUE",
+                    "value": "Something something"
+                }
+            ],
+            "externalConsole": false,
+            "MIMode": "gdb",
+            "setupCommands": [
+                {
+                    "description": "Enable pretty-printing for gdb",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": true
+                }
+            ]
+        },
+
 
 
         {

docs/BuildPrerequisites.md

@@ -27,7 +27,7 @@ Run the following commands to install dependent libraries required by the PiPeda
     sudo apt install -y authbind
     sudo apt install -y libavahi-client-dev
     sudo apt install -y libnm-dev libicu-dev
-    sudo apt install -y libsdbus-c++-dev libzip-dev
+    sudo apt install -y libsdbus-c++-dev libzip-dev google-perftools
     
 
 ### Installing Sources

profiler_tools/ToobNam_profile

@@ -0,0 +1,3 @@
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+${SCRIPT_DIR}/../build/src/profilePlugin -w ToobNam_Profile -o /tmp/ToobNam.perf &&\
+google-pprof --text ${SCRIPT_DIR}/../build/src/profilePlugin --add_lib  /usr/lib/lv2/ToobAmp.lv2/ToobAmp.so  /tmp/ToobNam.perf >./ToobNam.txt

profiler_tools/nam_profile

@@ -0,0 +1,3 @@
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+${SCRIPT_DIR}/../build/src/profilePlugin -w Nam_Profile -o /tmp/nam.perf &&\
+google-pprof --text ${SCRIPT_DIR}/../build/src/profilePlugin --add_lib  /usr/lib/lv2/neural_amp_modeler.lv2/neural_amp_modeler.so  /tmp/nam.perf >./nam.txt

src/CMakeLists.txt

@@ -310,6 +310,14 @@ target_link_libraries(pipedaltest PRIVATE PiPedalCommon)
 target_include_directories(pipedaltest PRIVATE ${PIPEDAL_INCLUDES}
 ) 
 
+add_executable(profilePlugin
+    profilePluginMain.cpp
+    )
+target_link_libraries(profilePlugin PRIVATE profiler  ${PIPEDAL_LIBS}) 
+
+target_include_directories(profilePlugin PRIVATE ${PIPEDAL_INCLUDES}
+    )
+
 add_executable(jsonTest
      testMain.cpp
      jsonTest.cpp

src/CommandLineParser.hpp

@@ -162,7 +162,7 @@ namespace pipedal
         {
             if (shortOption.length() != 0)
             {
-                auto option = "-" + longOption;
+                auto option = "-" + shortOption;
                 options.push_back(new BooleanOption(option, pResult, true));
                 options.push_back(new BooleanOption(option + "+", pResult, true));
                 options.push_back(new BooleanOption(option + "-", pResult, false));

src/PiPedalModel.cpp

@@ -492,7 +492,7 @@ void PiPedalModel::FirePedalboardChanged(int64_t clientId, bool loadAudioThread)
     if (loadAudioThread)
     {
         // notify the audio thread.
-        if (audioHost->IsOpen())
+        if (audioHost && audioHost->IsOpen())
         {
             LoadCurrentPedalboard();
 
@@ -2070,6 +2070,21 @@ void PiPedalModel::CheckForResourceInitialization(Pedalboard &pedalboard)
         }
     }
 }
+Pedalboard &PiPedalModel::GetPedalboard()
+{
+    return this->pedalboard;
+}
+std::shared_ptr<Lv2Pedalboard> PiPedalModel::GetLv2Pedalboard()
+{
+    // test only.
+    Lv2PedalboardErrorList errorMessages;
+    std::shared_ptr<Lv2Pedalboard> lv2Pedalboard{this->pluginHost.CreateLv2Pedalboard(this->pedalboard, errorMessages)};
+    if (errorMessages.size() != 0)
+    {
+        throw std::runtime_error(errorMessages[0].message);
+    }
+    return lv2Pedalboard;
+}
 bool PiPedalModel::LoadCurrentPedalboard()
 {
     Lv2PedalboardErrorList errorMessages;

src/PiPedalModel.hpp

@@ -251,6 +251,9 @@ namespace pipedal
 
 
         void SetPedalboard(int64_t clientId, Pedalboard &pedalboard);
+        Pedalboard&GetPedalboard();
+        std::shared_ptr<Lv2Pedalboard> GetLv2Pedalboard();
+
         void UpdateCurrentPedalboard(int64_t clientId, Pedalboard &pedalboard);
 
         void GetPresets(PresetIndex *pResult);

src/PluginHost.hpp

@@ -740,9 +740,9 @@ namespace pipedal
         size_t maxBufferSize = 1024;
         size_t maxAtomBufferSize = 16 * 1024;
         bool hasMidiInputChannel;
-        int numberOfAudioInputChannels = 2;
-        int numberOfAudioOutputChannels = 2;
-        double sampleRate = 0;
+        int numberOfAudioInputChannels = 1;
+        int numberOfAudioOutputChannels = 1;
+        double sampleRate = 48000;
 
         std::string vst3CachePath;
 

src/profilePluginMain.cpp

@@ -0,0 +1,255 @@
+#include "PiPedalModel.hpp"
+#include "PiPedalConfiguration.hpp"
+#include "Pedalboard.hpp"
+#include "Lv2Log.hpp"
+#include "RingBufferReader.hpp"
+#include "CommandLineParser.hpp"
+#include <thread>
+#include <chrono>
+
+// apt install google-perftools
+#include <gperftools/profiler.h>
+
+using namespace pipedal;
+using namespace std;
+namespace fs = std::filesystem;
+
+// discards data from the ring buffer without discarding it.
+
+using WriterRingbuffer = RingBuffer<false, true>;
+
+class RingBufferSink
+{
+public:
+    RingBufferSink(WriterRingbuffer &writerRingBuffer)
+        : writerRingbuffer(writerRingBuffer)
+    {
+        thread = std::make_unique<std::thread>(
+            [this]()
+            {
+                ThreadProc();
+            });
+    }
+    void Close()
+    {
+        if (!closed)
+        {
+            closed = true;
+            writerRingbuffer.close();
+            terminateThread = true;
+            thread->join();
+            thread = nullptr;
+        }
+    }
+    ~RingBufferSink()
+    {
+        Close();
+    }
+
+private:
+    void ThreadProc()
+    {
+        std::vector<uint8_t> dataVector(1024);
+        uint8_t *data = dataVector.data();
+        while (true)
+        {
+            RingBufferStatus status = writerRingbuffer.readWait_for(std::chrono::milliseconds(10));
+            if (status == RingBufferStatus::Closed)
+            {
+                break;
+            }
+            if (status == RingBufferStatus::Ready)
+            {
+                size_t available = writerRingbuffer.readSpace();
+                while (available != 0)
+                {
+                    size_t thisTime = std::min(dataVector.size(), available);
+                    writerRingbuffer.read(thisTime, data);
+                    available -= thisTime;
+                }
+            }
+        }
+    }
+    bool closed = false;
+    std::atomic<bool> terminateThread{false};
+
+    std::unique_ptr<std::thread> thread;
+    WriterRingbuffer &writerRingbuffer;
+};
+struct ProfileOptions
+{
+    std::string presetName;
+    float benchmark_seconds = 20;
+    std::string outputFilename = "/tmp/profilePlugin.perf";
+    bool noProfile = false;
+    bool waitForWork = false;
+    size_t frameSize = 64;
+};
+
+void profilePlugin(const ProfileOptions &profileOptions)
+{
+    size_t nFrames = profileOptions.frameSize;
+    Lv2Log::log_level(LogLevel::Info);
+
+    /*** Initialize the model */
+    PiPedalModel model;
+    fs::path doc_root = "/etc/pipedal/config";
+    PiPedalConfiguration configuration;
+    try
+    {
+        configuration.Load(doc_root, "");
+    }
+    catch (const std::exception &e)
+    {
+        std::stringstream s;
+        s << "Unable to read configuration from '" << (doc_root / "config.json") << "'. (" << e.what() << ")";
+        throw std::runtime_error(s.str());
+    }
+
+    model.Init(configuration);
+
+    model.LoadLv2PluginInfo();
+
+    // model.Load(); don't start audio.
+
+    /* *** Load the preset.  */
+    PresetIndex presetIndex;
+    model.GetPresets(&presetIndex);
+
+    int64_t presetIndexId = 0;
+    bool presetIndexFound = false;
+    for (const auto &preset : presetIndex.presets())
+    {
+        if (preset.name() == profileOptions.presetName)
+        {
+            presetIndexId = preset.instanceId();
+            presetIndexFound = true;
+            break;
+        }
+    }
+    if (!presetIndexFound)
+    {
+        throw std::runtime_error("Preset not found.");
+    }
+    model.LoadPreset(-1, presetIndexId);
+
+    auto pedalboard = model.GetCurrentPedalboardCopy();
+    cout << "uri: " << pedalboard.items()[0].uri() << endl;
+    /* *** Get and prepare the audio thread pedalboard. */
+    auto lv2Pedalboard = model.GetLv2Pedalboard();
+
+    lv2Pedalboard->Activate();
+
+    std::vector<float> inputBufferVector;
+    std::vector<float> outputBufferVector;
+    inputBufferVector.resize(nFrames);
+    outputBufferVector.resize(nFrames);
+
+    float *inputBuffers[2]{inputBufferVector.data(), nullptr};
+    float *outputBuffers[2] = {inputBufferVector.data(), nullptr};
+
+    WriterRingbuffer writerRingbuffer;
+    RealtimeRingBufferWriter ringBufferWriter(&writerRingbuffer);
+
+    RingBufferSink ringBufferSink(writerRingbuffer);
+
+    /* *** Pump the plugin for a bit if it is expected to do work on the scheduler  thread when initializing */
+    if (profileOptions.waitForWork)
+    {
+        using clock = std::chrono::steady_clock;
+
+        // idle, pumping the plugin occasionally to allow inital scheduler work to complete.
+        auto waitStart = clock::now();
+        auto waitDuration = std::chrono::duration_cast<clock::duration>(std::chrono::seconds(3));
+
+        while (true)
+        {
+            lv2Pedalboard->Run(inputBuffers, outputBuffers, nFrames, &ringBufferWriter);
+
+            auto elapsed = clock::now() - waitStart;
+            if (elapsed >= waitDuration)
+            {
+                break;
+            }
+            std::this_thread::sleep_for(std::chrono::milliseconds(100)); // the scheduler thread runs.
+        }
+    }
+
+    /* *** Run the benchmark */
+    if (!profileOptions.noProfile)
+    {
+        ProfilerStart(profileOptions.outputFilename.c_str());
+    }
+    auto startTime = std::chrono::system_clock::now();
+
+    size_t repetitions = static_cast<size_t>(48000 * profileOptions.benchmark_seconds / nFrames);
+    for (size_t i = 0; i < repetitions; ++i)
+    {
+        lv2Pedalboard->Run(inputBuffers, outputBuffers, nFrames, &ringBufferWriter);
+    }
+
+    auto elapsedTime = std::chrono::high_resolution_clock::now() - startTime;
+    if (!profileOptions.noProfile)
+    {
+        ProfilerStop();
+    }
+    std::chrono::milliseconds us = std::chrono::duration_cast<chrono::milliseconds>(elapsedTime);
+    std::cout << "Ellapsed time: " << (us.count() / 1000.0) << "s" << endl;
+
+    ringBufferSink.Close();
+
+    lv2Pedalboard->Deactivate();
+}
+
+int main(int argc, char **argv)
+{
+    try
+    {
+        ProfileOptions profileOptions;
+        bool help = false;
+        CommandLineParser commandLineParser;
+        commandLineParser.AddOption("w", "wait-for-work", &profileOptions.waitForWork);
+        commandLineParser.AddOption("", "no-profile", &profileOptions.noProfile);
+        commandLineParser.AddOption("o", "output", &profileOptions.outputFilename);
+        commandLineParser.AddOption("s", "seconds", &profileOptions.benchmark_seconds);
+        commandLineParser.AddOption("h", "help", &help);
+
+        commandLineParser.Parse(argc, (const char **)argv);
+
+        if (commandLineParser.Arguments().size() != 1 || help)
+        {
+            cout << "profilePlugin - Generate profiling data for LV2 Plugins" << endl;
+            cout << "Copyright (c) 2024 Robin E. R. Davies" << endl;
+            cout << endl;
+            cout << "Syntax:  profilePlugin preset_name [options...]" << endl;
+            cout << "         where preset_name is the name of a PiPedal preset." << endl;
+            cout << endl;
+            cout << "          A google-perf profile capture will be written to " << endl;
+            cout << "          /tmp/profilePlugin.perf" << endl;
+            cout << endl;
+            cout << "Options:" << endl;
+            cout << "    --no-profile:" << endl;
+            cout << "          do NOT generate a perf file." << endl;
+            cout << "    -o, --output filename:" << endl;
+            cout << "          The file to which profiler data is written. " << endl;
+            cout << "          Defaults to /tmp/profilePlugin.perf" << endl;
+            cout << "    -w, --wait-for-work: " << endl;
+            cout << "          Assume that the plugin will load data on the LV2 scheduler thread." << endl;
+            cout << "    -s, --seconds time_in_seconds: " << endl;
+            cout << "          The number of seconds of audio to process." << endl;
+            cout << "     -h, --help:  display this message." << endl;
+            cout << endl;
+            return help ? EXIT_SUCCESS : EXIT_FAILURE;
+        }
+
+        profileOptions.presetName = commandLineParser.Arguments()[0];
+
+        profilePlugin(profileOptions);
+    }
+    catch (const std::exception &e)
+    {
+        cerr << "Error: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+    return EXIT_SUCCESS;
+}