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perf: faster Cache::write_contiguous() (#5715)

This commit is contained in:
Charles Kerr 2023-07-02 15:23:32 -05:00
parent 2941005e34
commit 14e31babbb
1 changed files with 5 additions and 4 deletions
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9
libtransmission/cache.cc
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@ -72,20 +72,21 @@ int Cache::write_contiguous(CIter const begin, CIter const end) const
if (end - begin > 1) if (end - begin > 1)
{ {
// Yes, there are. // copy blocks into contiguous memory
auto const buflen = std::accumulate( auto const buflen = std::accumulate(
begin, begin,
end, end,
size_t{}, size_t{},
[](size_t sum, auto const& block) { return sum + std::size(*block.buf); }); [](size_t sum, auto const& block) { return sum + std::size(*block.buf); });
buf.reserve(buflen); buf.resize(buflen);
auto* walk = std::data(buf);
for (auto iter = begin; iter != end; ++iter) for (auto iter = begin; iter != end; ++iter)
{ {
TR_ASSERT(begin->key.first == iter->key.first); TR_ASSERT(begin->key.first == iter->key.first);
TR_ASSERT(begin->key.second + std::distance(begin, iter) == iter->key.second); TR_ASSERT(begin->key.second + std::distance(begin, iter) == iter->key.second);
buf.insert(std::end(buf), std::begin(*iter->buf), std::end(*iter->buf)); walk = std::copy_n(std::data(*iter->buf), std::size(*iter->buf), walk);
} }
TR_ASSERT(std::size(buf) == buflen); TR_ASSERT(std::data(buf) + std::size(buf) == walk);
towrite = &buf; towrite = &buf;
} }