Further increase reductions with increasing number of threads

Vizvezdenec · vondele · commit 85bcf4741e27 · 2020-04-05T08:44:25.000+02:00
This patch doubles the reduction increase with thread count. passed STC https://tests.stockfishchess.org/tests/view/5e874f5a4411759d9d098696 LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 9162 W: 1558 L: 1385 D: 6219 Ptnml(0-2): 90, 958, 2343, 1069, 121 passed LTC https://tests.stockfishchess.org/tests/view/5e8762804411759d9d09869f LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 79364 W: 9541 L: 9159 D: 60664 Ptnml(0-2): 462, 6880, 24661, 7172, 507 closes #2615 bench 4831963
diff --git a/src/search.cpp b/src/search.cpp
@@ -194,7 +194,7 @@ namespace {
 void Search::init() {
 
   for (int i = 1; i < MAX_MOVES; ++i)
-      Reductions[i] = int((24.8 + std::log(Threads.size()) / 2) * std::log(i));
+      Reductions[i] = int((24.8 + std::log(Threads.size())) * std::log(i));
 }
 
 

Original file line number	Diff line number	Diff line change
`@@ -194,7 +194,7 @@ namespace {`
`194`	`194`	`void Search::init() {`
`195`	`195`
`196`	`196`	`for (int i = 1; i < MAX_MOVES; ++i)`
`197`		`- Reductions[i] = int((24.8 + std::log(Threads.size()) / 2) * std::log(i));`
	`197`	`+ Reductions[i] = int((24.8 + std::log(Threads.size())) * std::log(i));`
`198`	`198`	`}`
`199`	`199`
`200`	`200`