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feat: download first and last piece first in sequential mode (#6893)

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* feat: download first and last piece first in sequential mode

* test: fix tests
This commit is contained in:
Yat Ho 2024-12-14 09:32:03 +08:00 committed by GitHub
parent b4bbc8744e
commit b3912fa1a5
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2 changed files with 27 additions and 6 deletions
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21
libtransmission/peer-mgr-wishlist.cc
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@ -351,7 +351,26 @@ private:
continue;
}
auto const salt = is_sequential ? piece : salter();
auto const salt = [&]()
{
if (!is_sequential)
{
return salter();
}
// Download first and last piece first
if (piece == 0U)
{
return 0U;
}
if (piece == n_pieces - 1U)
{
return 1U;
}
return piece + 1U;
}();
candidates_.emplace_back(piece, salt, &mediator_);
}
std::sort(std::begin(candidates_), std::end(candidates_));

12
tests/libtransmission/peer-mgr-wishlist-test.cc
View file

@ -1511,7 +1511,8 @@ TEST_F(PeerMgrWishlistTest, settingSequentialDownloadRebuildsWishlist)
return wishlist.next(n_wanted, PeerHasAllPieces, ClientHasNoActiveRequests);
};
// we should get pieces in order when we ask for blocks
// we should get pieces in sequential order when we ask for blocks,
// except the last piece should follow immediately after the first piece
// NB: when all other things are equal in the wishlist, pieces are
// picked at random so this test -could- pass even if there's a bug.
// So test several times to shake out any randomness
@ -1526,8 +1527,8 @@ TEST_F(PeerMgrWishlistTest, settingSequentialDownloadRebuildsWishlist)
}
EXPECT_EQ(150U, requested.count());
EXPECT_EQ(100U, requested.count(0, 100));
EXPECT_EQ(50U, requested.count(100, 200));
EXPECT_EQ(0U, requested.count(200, 300));
EXPECT_EQ(0U, requested.count(100, 200));
EXPECT_EQ(50U, requested.count(200, 300));
}
// Same premise as previous test, but ask for more blocks.
@ -1540,7 +1541,8 @@ TEST_F(PeerMgrWishlistTest, settingSequentialDownloadRebuildsWishlist)
requested.set_span(span.begin, span.end);
}
EXPECT_EQ(250U, requested.count());
EXPECT_EQ(200U, requested.count(0, 200));
EXPECT_EQ(50U, requested.count(200, 300));
EXPECT_EQ(100U, requested.count(0, 100));
EXPECT_EQ(50U, requested.count(100, 200));
EXPECT_EQ(100U, requested.count(200, 300));
}
}