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perf: make CompareCacheBlockByKey constexpr (#5678)

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tearfur 2023-06-28 23:23:38 +08:00 • committed by GitHub
parent 6bbe6537cb
commit 7fa1498ed5
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 18 additions and 20 deletions
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14
libtransmission/cache.cc
View file

@ -148,7 +148,7 @@ int Cache::write_block(tr_torrent_id_t tor_id, tr_block_index_t block, std::uniq
}
auto const key = Key{ tor_id, block };
auto iter = std::lower_bound(std::begin(blocks_), std::end(blocks_), key, CompareCacheBlockByKey{});
auto iter = std::lower_bound(std::begin(blocks_), std::end(blocks_), key, CompareCacheBlockByKey);
if (iter == std::end(blocks_) || iter->key != key)
{
iter = blocks_.emplace(iter);
@ -169,7 +169,7 @@ Cache::CIter Cache::get_block(tr_torrent const* torrent, tr_block_info::Location
std::begin(blocks_),
std::end(blocks_),
make_key(torrent, loc),
CompareCacheBlockByKey{});
CompareCacheBlockByKey);
begin < end)
{
return begin;
@ -221,23 +221,21 @@ int Cache::flush_span(CIter const begin, CIter const end)
int Cache::flush_file(tr_torrent const* torrent, tr_file_index_t file)
{
auto const compare = CompareCacheBlockByKey{};
auto const tor_id = torrent->id();
auto const [block_begin, block_end] = tr_torGetFileBlockSpan(torrent, file);
return flush_span(
std::lower_bound(std::begin(blocks_), std::end(blocks_), std::make_pair(tor_id, block_begin), compare),
std::lower_bound(std::begin(blocks_), std::end(blocks_), std::make_pair(tor_id, block_end), compare));
std::lower_bound(std::begin(blocks_), std::end(blocks_), std::make_pair(tor_id, block_begin), CompareCacheBlockByKey),
std::lower_bound(std::begin(blocks_), std::end(blocks_), std::make_pair(tor_id, block_end), CompareCacheBlockByKey));
}
int Cache::flush_torrent(tr_torrent const* torrent)
{
auto const compare = CompareCacheBlockByKey{};
auto const tor_id = torrent->id();
return flush_span(
std::lower_bound(std::begin(blocks_), std::end(blocks_), std::make_pair(tor_id, 0), compare),
std::lower_bound(std::begin(blocks_), std::end(blocks_), std::make_pair(tor_id + 1, 0), compare));
std::lower_bound(std::begin(blocks_), std::end(blocks_), std::make_pair(tor_id, 0), CompareCacheBlockByKey),
std::lower_bound(std::begin(blocks_), std::end(blocks_), std::make_pair(tor_id + 1, 0), CompareCacheBlockByKey));
}
int Cache::flush_biggest()

24
libtransmission/cache.h
View file

@ -53,18 +53,6 @@ private:
using Blocks = std::vector<CacheBlock>;
using CIter = Blocks::const_iterator;
struct CompareCacheBlockByKey
{
[[nodiscard]] constexpr bool operator()(Key const& key, CacheBlock const& block)
{
return key < block.key;
}
[[nodiscard]] constexpr bool operator()(CacheBlock const& block, Key const& key)
{
return block.key < key;
}
};
[[nodiscard]] static Key make_key(tr_torrent const* torrent, tr_block_info::Location loc) noexcept;
[[nodiscard]] static std::pair<CIter, CIter> find_biggest_span(CIter begin, CIter end) noexcept;
@ -96,4 +84,16 @@ private:
mutable size_t disk_write_bytes_ = 0;
mutable size_t cache_writes_ = 0;
mutable size_t cache_write_bytes_ = 0;
static constexpr struct
{
[[nodiscard]] constexpr bool operator()(Key const& key, CacheBlock const& block)
{
return key < block.key;
}
[[nodiscard]] constexpr bool operator()(CacheBlock const& block, Key const& key)
{
return block.key < key;
}
} CompareCacheBlockByKey{};
};