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[Cluster] Move IO to the root.

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Fixes one TODO, by moving the IO related to bestmove to the root, even if this move is found by a different rank.

This is needed to make sure IO from different ranks is ordered properly. If this is not done it is possible that e.g. a bestmove arrives before all info lines have been received, leading to output that confuses tools and humans alike (see e.g. https://github.com/cutechess/cutechess/issues/472)
This commit is contained in:
Joost VandeVondele
2019-01-04 14:56:04 +01:00
committed by Stéphane Nicolet
parent 267ca781cd
commit 8a3f8e21ae
3 changed files with 54 additions and 17 deletions
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src/cluster.h
+3 -2
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@@ -34,6 +34,7 @@ namespace Cluster {
struct MoveInfo {
int move;
int ponder;
int depth;
int score;
int rank;
@@ -73,7 +74,7 @@ int size();
int rank();
inline bool is_root() { return rank() == 0; }
void save(Thread* thread, TTEntry* tte, Key k, Value v, Bound b, Depth d, Move m, Value ev);
void pick_moves(MoveInfo& mi);
void pick_moves(MoveInfo& mi, std::string& PVLine);
void ttRecvBuff_resize(size_t nThreads);
uint64_t nodes_searched();
uint64_t tb_hits();
@@ -90,7 +91,7 @@ constexpr int size() { return 1; }
constexpr int rank() { return 0; }
constexpr bool is_root() { return true; }
inline void save(Thread*, TTEntry* tte, Key k, Value v, Bound b, Depth d, Move m, Value ev) { tte->save(k, v, b, d, m, ev); }
inline void pick_moves(MoveInfo&) { }
inline void pick_moves(MoveInfo&, std::string&) { }
inline void ttRecvBuff_resize(size_t) { }
uint64_t nodes_searched();
uint64_t tb_hits();