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Distinct iteration paths for Lazy SMP threads

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STC 5+0.1, threads 7
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 6026 W: 1047 L: 901 D: 4078

LTC: 20+0.2, threads 7
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 19739 W: 2910 L: 2721 D: 14108

STC 5+0.1, threads 20
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 2493 W: 462 L: 331 D: 1700

LTC 30+0.3, threads 20
ELO: 8.86 +-3.7 (95%) LOS: 100.0%
Total: 8000 W: 1076 L: 872 D: 6052

Bench: 8012530

Resolves #525
This commit is contained in:
Guenther Demetz 2015-12-18 21:55:07 +00:00 • committed by Joona Kiiski
parent 2c1797ab81
commit 38adb487ca
1 changed files with 22 additions and 2 deletions
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24
src/search.cpp
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@ -387,9 +387,29 @@ void Thread::search() {
// Iterative deepening loop until requested to stop or target depth reached
while (++rootDepth < DEPTH_MAX && !Signals.stop && (!Limits.depth || rootDepth <= Limits.depth))
{
// Set up the new depth for the helper threads
// Set up the new depth for the helper threads skipping in average each
// 2nd ply (using a half density map similar to a Hadamard matrix).
if (!isMainThread)
rootDepth = std::min(DEPTH_MAX - ONE_PLY, Threads.main()->rootDepth + Depth(int(2.2 * log(1 + this->idx))));
{
int d = rootDepth + rootPos.game_ply();
if (idx <= 6 || idx > 24)
{
if (((d + idx) >> (msb(idx + 1) - 1)) % 2)
continue;
}
else
{
// Table of values of 6 bits with 3 of them set
static const int HalfDensityMap[] = {
0x07, 0x0b, 0x0d, 0x0e, 0x13, 0x16, 0x19, 0x1a, 0x1c,
0x23, 0x25, 0x26, 0x29, 0x2c, 0x31, 0x32, 0x34, 0x38
};
if ((HalfDensityMap[idx - 7] >> (d % 6)) & 1)
continue;
}
}
// Age out PV variability metric
if (isMainThread)