Guard against 'divide by zero' in bench

[stockfish] / src / benchmark.cpp

diff --git a/src/benchmark.cpp b/src/benchmark.cpp
index 9b2e81e1a1f335aaf2cc83ed65894ed9c60b7204..5800a37bb10484526c0aeb923d24c20bd2b0a0d8 100644 (file)
--- a/src/benchmark.cpp
+++ b/src/benchmark.cpp
@@ -26,6 +26,7 @@
 #include "position.h"
 #include "search.h"
 #include "thread.h"
+#include "tt.h"
 #include "ucioption.h"
 
 using namespace std;
@@ -73,6 +74,7 @@ void benchmark(const Position& current, istream& is) {
 
   Options["Hash"]    = ttSize;
   Options["Threads"] = threads;
+  TT.clear();
 
   if (limitType == "time")
       limits.movetime = 1000 * atoi(limit.c_str()); // movetime is in ms
@@ -130,10 +132,10 @@ void benchmark(const Position& current, istream& is) {
       }
   }
 
-  int e = time.elapsed();
+  int e = time.elapsed() + 1; // Assure positive to avoid a 'divide by zero'
 
   cerr << "\n==========================="
        << "\nTotal time (ms) : " << e
        << "\nNodes searched  : " << nodes
-       << "\nNodes/second    : " << int(nodes / (e / 1000.0)) << endl;
+       << "\nNodes/second    : " << 1000 * nodes / e << endl;
 }