Use minimumSplitDepth = 5

snicolet · zamar · commit 2ca142a5b4ca · 2015-04-09T20:32:36.000+01:00
Using minimumSplitDepth = 5 seems to be the best compromise in the current SMP implementation STC, 11 threads: ELO: 14.87 +-4.1 (95%) LOS: 100.0% Total: 8509 W: 1497 L: 1133 D: 5879 STC, 4 threads: ELO: 0.30 +-2.8 (95%) LOS: 58.2% Total: 20000 W: 3365 L: 3348 D: 13287 STC, 2 threads: ELO: -1.02 +-2.0 (95%) LOS: 16.4% Total: 40000 W: 7087 L: 7204 D: 25709 Resolves #324
diff --git a/src/thread.cpp b/src/thread.cpp
@@ -323,7 +323,7 @@ void ThreadPool::read_uci_options() {
 
   // If zero (default) then set best minimum split depth automatically
   if (!minimumSplitDepth)
-      minimumSplitDepth = requested < 8 ? 4 * ONE_PLY : 7 * ONE_PLY;
+      minimumSplitDepth =  5 * ONE_PLY ;
 
   while (size() < requested)
       push_back(new_thread<Thread>());
