From: Marco Costalba <mcostalba@gmail.com>
Date: Sun, 8 Jun 2014 19:56:31 +0000 (+0900)
Subject: Check for an available slave early on
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=ce1c260ea97c14eea996d0a2638f4876ccbc412b;ds=sidebyside

Check for an available slave early on

Don't take the split lock if we don't have
available slaves (about 30-40% of times).

This new condition allows to retire the now
redundant one on number of threads.

No functional change.
---

diff --git a/src/search.cpp b/src/search.cpp
index 5cdc0169..e24d264d 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -980,8 +980,8 @@ moves_loop: // When in check and at SpNode search starts from here
 
       // Step 19. Check for splitting the search
       if (   !SpNode
-          &&  Threads.size() >= 2
           &&  depth >= Threads.minimumSplitDepth
+          &&  Threads.available_slave(thisThread)
           &&  (   !thisThread->activeSplitPoint
                || !thisThread->activeSplitPoint->allSlavesSearching)
           &&  thisThread->splitPointsSize < MAX_SPLITPOINTS_PER_THREAD)