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Code Issues Releases Wiki Activity

Further simplify skipping of plies with threads

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No functional change

Closes #1020
This commit is contained in:
pb00068 2017-03-08 18:01:16 -08:00 • committed by Joona Kiiski
parent 3627348e2b
commit cc76524c2e
1 changed files with 7 additions and 15 deletions
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22
src/search.cpp
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@ -132,19 +132,6 @@ namespace {
Move pv[3];
};
// skip half of the plies in blocks depending on the helper thread idx.
bool skip_ply(int idx, int ply) {
idx = (idx - 1) % 20 + 1; // cycle after 20 threads.
// number of successive plies to skip, depending on idx.
int ones = 1;
while (ones * (ones + 1) < idx)
ones++;
return ((ply + idx - 1) / ones - ones) % 2 == 0;
}
EasyMoveManager EasyMove;
Value DrawValue[COLOR_NB];
@ -321,6 +308,9 @@ void MainThread::search() {
std::cout << sync_endl;
}
// Sizes and phases of the skip-blocks, used for distributing search depths across the threads.
static int skipsize[20] = {1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4};
static int phase [20] = {0, 1, 0, 1, 2, 3, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 6, 7};
// Thread::search() is the main iterative deepening loop. It calls search()
// repeatedly with increasing depth until the allocated thinking time has been
@ -358,13 +348,15 @@ void Thread::search() {
multiPV = std::min(multiPV, rootMoves.size());
int hIdx = (idx - 1) % 20; // helper index, cycle after 20 threads
// Iterative deepening loop until requested to stop or the target depth is reached
while ( (rootDepth += ONE_PLY) < DEPTH_MAX
&& !Signals.stop
&& (!Limits.depth || Threads.main()->rootDepth / ONE_PLY <= Limits.depth))
{
// skip plies for helper threads
if (idx && skip_ply(idx, rootDepth / ONE_PLY + rootPos.game_ply()))
// skip half of the plies in blocks depending on game ply and helper index.
if (idx && ((rootDepth / ONE_PLY + rootPos.game_ply() + phase[hIdx]) / skipsize[hIdx]) % 2)
continue;
// Age out PV variability metric