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AUP3: Put checkpointing in a separate thread

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This is highly experimental.  It's defers most checkpointing
to a separate thread to see if we get better throughput and
less choppiness when applying effects.
This commit is contained in:
Leland Lucius
2020-07-19 03:28:02 -05:00
parent e669b365f1
commit d2b4a0e488
4 changed files with 143 additions and 32 deletions
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25
src/ProjectFileIO.h
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@@ -11,8 +11,14 @@ Paul Licameli split from AudacityProject.h
#ifndef __AUDACITY_PROJECT_FILE_IO__
#define __AUDACITY_PROJECT_FILE_IO__
#include <atomic>
#include <condition_variable>
#include <deque>
#include <memory>
#include <mutex>
#include <thread>
#include <set>
#include "ClientData.h" // to inherit
#include "Prefs.h" // to inherit
#include "xml/XMLTagHandler.h" // to inherit
@@ -110,6 +116,10 @@ public:
// The last vacuum check found unused blocks in the project file
bool HadUnused();
bool TransactionStart(const wxString &name);
bool TransactionCommit(const wxString &name);
bool TransactionRollback(const wxString &name);
private:
void WriteXMLHeader(XMLWriter &xmlFile) const;
void WriteXML(XMLWriter &xmlFile, bool recording = false, const std::shared_ptr<TrackList> &tracks = nullptr) /* not override */;
@@ -155,10 +165,6 @@ private:
bool CloseDB();
bool DeleteDB();
bool TransactionStart(const wxString &name);
bool TransactionCommit(const wxString &name);
bool TransactionRollback(const wxString &name);
bool Query(const char *sql, ExecResult &result);
bool GetValue(const char *sql, wxString &value);
@@ -189,6 +195,9 @@ private:
bool ShouldVacuum(const std::shared_ptr<TrackList> &tracks);
void CheckpointThread();
static int CheckpointHook(void *that, sqlite3 *db, const char *schema, int pages);
private:
// non-static data members
std::weak_ptr<AudacityProject> mpProject;
@@ -221,8 +230,12 @@ private:
TranslatableString mLastError;
TranslatableString mLibraryError;
// Track the highest blockid while loading a project
int64_t mHighestBlockID;
std::deque<sqlite3 *> mCheckpointWork;
std::condition_variable mCheckpointCondition;
std::mutex mCheckpointMutex;
std::thread mCheckpointThread;
std::atomic_bool mCheckpointStop;
std::mutex mCheckpointActive;
friend SqliteSampleBlock;
friend AutoCommitTransaction;