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Merge pull request #6286 from JosJuice/game-list-cache-vector

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DolphinWX: Speed up in-memory operations on game list cache
This commit is contained in:
Markus Wick 2018-01-05 23:37:41 +01:00 committed by GitHub
commit 1cf1e7cde0
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 35 additions and 31 deletions
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64
Source/Core/DolphinWX/GameListCtrl.cpp
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@ -10,7 +10,7 @@
#include <cstring>
#include <memory>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include <wx/app.h>
@ -760,27 +760,20 @@ void GameListCtrl::RescanList()
const std::vector<std::string> search_extensions = {".gcm", ".tgc", ".iso", ".ciso", ".gcz",
".wbfs", ".wad", ".dol", ".elf"};
// TODO This could process paths iteratively as they are found
auto search_results = Common::DoFileSearch(SConfig::GetInstance().m_ISOFolder, search_extensions,
SConfig::GetInstance().m_RecursiveISOFolder);
const std::vector<std::string> search_results_vector =
Common::DoFileSearch(SConfig::GetInstance().m_ISOFolder, search_extensions,
SConfig::GetInstance().m_RecursiveISOFolder);
// Copy search results into a set, except ones that match DiscIO::ShouldHideFromGameList.
// TODO Prevent DoFileSearch from looking inside /files/ directories of DirectoryBlobs at all?
// TODO Make DoFileSearch support filter predicates so we don't have remove things afterwards?
search_results.erase(
std::remove_if(search_results.begin(), search_results.end(), DiscIO::ShouldHideFromGameList),
search_results.end());
std::vector<std::string> cached_paths;
for (const auto& file : m_cached_files)
cached_paths.emplace_back(file->GetFileName());
std::sort(cached_paths.begin(), cached_paths.end());
std::list<std::string> removed_paths;
std::set_difference(cached_paths.cbegin(), cached_paths.cend(), search_results.cbegin(),
search_results.cend(), std::back_inserter(removed_paths));
std::vector<std::string> new_paths;
std::set_difference(search_results.cbegin(), search_results.cend(), cached_paths.cbegin(),
cached_paths.cend(), std::back_inserter(new_paths));
std::unordered_set<std::string> search_results;
search_results.reserve(search_results_vector.size());
for (const std::string& path : search_results_vector)
{
if (!DiscIO::ShouldHideFromGameList(path))
search_results.insert(path);
}
// Reload the TitleDatabase
{
@ -788,24 +781,35 @@ void GameListCtrl::RescanList()
m_title_database = {};
}
// For now, only scan new_paths. This could cause false negatives (file actively being written),
// but otherwise should be fine.
bool cache_changed = false;
{
std::unique_lock<std::mutex> lk(m_cache_mutex);
for (const auto& path : removed_paths)
// Delete paths that aren't in search_results from m_cached_files,
// while simultaneously deleting paths that aren't in m_cached_files from search_results.
// For the sake of speed, we don't care about maintaining the order of m_cached_files.
{
auto it = std::find_if(m_cached_files.cbegin(), m_cached_files.cend(),
[&path](const std::shared_ptr<GameListItem>& file) {
return file->GetFileName() == path;
});
if (it != m_cached_files.cend())
auto it = m_cached_files.begin();
auto end = m_cached_files.end();
while (it != end)
{
cache_changed = true;
m_cached_files.erase(it);
if (search_results.erase((*it)->GetFileName()))
{
++it;
}
else
{
cache_changed = true;
--end;
*it = std::move(*end);
}
}
m_cached_files.erase(it, m_cached_files.end());
}
for (const auto& path : new_paths)
// Now that the previous loop has run, search_results only contains paths that
// aren't in m_cached_files, so we simply add all of them to m_cached_files.
for (const auto& path : search_results)
{
auto file = std::make_shared<GameListItem>(path);
if (file->IsValid())

2
Source/Core/DolphinWX/GameListCtrl.h
View File

@ -125,7 +125,7 @@ private:
} m_image_indexes;
// Actual backing GameListItems are maintained in a background thread and cached to file
std::list<std::shared_ptr<GameListItem>> m_cached_files;
std::vector<std::shared_ptr<GameListItem>> m_cached_files;
// Locks the list, not the contents
std::mutex m_cache_mutex;
Core::TitleDatabase m_title_database;