Fixing how time is measured

lemire · Dec 9, 2013 · 44509bf · 44509bf
1 parent 0963a32
commit 44509bf
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Showing 19 changed files with 19 additions and 36 deletions.
diff --git a/2010/07/19/is-multiplication-slower-than-addition/sillybenchmark.cpp b/2010/07/19/is-multiplication-slower-than-addition/sillybenchmark.cpp
@@ -21,8 +21,7 @@ class ZTimer
 public:
     ZTimer() { gettimeofday(&t1,0); t2 = t1; }
     void reset() {gettimeofday(&t1,0); t2 = t1;}
-    int elapsed() { return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1.
-tv_usec) / 1000); }
+    int elapsed() { return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000); }
     int split() { gettimeofday(&t2,0); return elapsed(); }
 };
 

diff --git a/2011/06/14/the-language-interpreters-are-the-new-machines/timingargmax.cpp b/2011/06/14/the-language-interpreters-are-the-new-machines/timingargmax.cpp
@@ -19,8 +19,7 @@ class ZTimer
 public:
     ZTimer() :  t1(), t2() { gettimeofday(&t1,0); t2 = t1; }
     void reset() {gettimeofday(&t1,0); t2 = t1;}
-    int elapsed() { return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1.
-tv_usec) / 1000); }
+    int elapsed() { return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000); }
     int split() { gettimeofday(&t2,0); return elapsed(); }
 };
 using namespace std;

diff --git a/2012/02/17/bitmaps-are-surprisingly-efficient/bitmapslow.cpp b/2012/02/17/bitmaps-are-surprisingly-efficient/bitmapslow.cpp
@@ -40,8 +40,7 @@ class ZTimer
 public:
     ZTimer() :  t1(), t2() { gettimeofday(&t1,0); t2 = t1; }
     void reset() {gettimeofday(&t1,0); t2 = t1;}
-    int elapsed() { return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1.
-tv_usec) / 1000); }
+    int elapsed() { return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000); }
     int split() { gettimeofday(&t2,0); return elapsed(); }
 };
 

diff --git a/2012/03/06/how-fast-is-bit-packing/bitpacking.cpp b/2012/03/06/how-fast-is-bit-packing/bitpacking.cpp
@@ -78,8 +78,7 @@ class ZTimer
 public:
     ZTimer() :  t1(), t2() { gettimeofday(&t1,0); t2 = t1; }
     void reset() {gettimeofday(&t1,0); t2 = t1;}
-    int elapsed() { return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1.
-tv_usec) / 1000); }
+    int elapsed() { return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000); }
     int split() { gettimeofday(&t2,0); return elapsed(); }
 };
 

diff --git a/2012/04/05/bit-packing-is-fast-but-integer-logarithm-is-slow/blogbitdetect.cpp b/2012/04/05/bit-packing-is-fast-but-integer-logarithm-is-slow/blogbitdetect.cpp
@@ -76,8 +76,7 @@ class ZTimer {
 		t2 = t1;
 	}
 	int elapsed() {
-		return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-				/ 1000);
+		return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
 	}
 	int split() {
 		gettimeofday(&t2, 0);

diff --git a/2012/05/31/test.cpp b/2012/05/31/test.cpp
@@ -23,8 +23,7 @@ class WallClockTimer {
         t2 = t1;
     }
     int elapsed() {
-        return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-                / 1000);
+        return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
     }
     int split() {
         gettimeofday(&t2, 0);

diff --git a/2012/07/23/cumulsum.cpp b/2012/07/23/cumulsum.cpp
@@ -39,8 +39,7 @@ class WallClockTimer {
         t2 = t1;
     }
     int elapsed() {
-        return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-                / 1000);
+        return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
     }
     int split() {
         gettimeofday(&t2, 0);

diff --git a/2012/07/23/cumulsums.cpp b/2012/07/23/cumulsums.cpp
@@ -39,8 +39,7 @@ class WallClockTimer {
         t2 = t1;
     }
     int elapsed() {
-        return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-                / 1000);
+        return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
     }
     int split() {
         gettimeofday(&t2, 0);

diff --git a/2012/10/29/benchmem.cpp b/2012/10/29/benchmem.cpp
@@ -25,8 +25,7 @@ class WallClockTimer {
         t2 = t1;
     }
     int elapsed() {
-        return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-                / 1000);
+        return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
     }
     int split() {
         gettimeofday(&t2, 0);

diff --git a/2012/10/29/storeload.cpp b/2012/10/29/storeload.cpp
@@ -33,8 +33,7 @@ class WallClockTimer {
         t2 = t1;
     }
     int elapsed() {
-        return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-                / 1000);
+        return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
     }
     int split() {
         gettimeofday(&t2, 0);

diff --git a/2013/01/31/dynarray.cpp b/2013/01/31/dynarray.cpp
@@ -24,8 +24,7 @@ class WallClockTimer {
         t2 = t1;
     }
     int elapsed() {
-        return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-                / 1000);
+        return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
     }
     int split() {
         gettimeofday(&t2, 0);

diff --git a/extra/benchmem.cpp b/extra/benchmem.cpp
@@ -37,8 +37,7 @@ class WallClockTimer {
         t2 = t1;
     }
     int elapsed() {
-        return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-                / 1000);
+        return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
     }
     int split() {
         gettimeofday(&t2, 0);

diff --git a/extra/costmod.cpp b/extra/costmod.cpp
@@ -26,7 +26,7 @@ using namespace std;
   public:
       WallClockTimer() : t1(), t2(){ gettimeofday(&t1,0); t2 = t1; }
       void reset() {gettimeofday(&t1,0); t2 = t1;}
-      int elapsed() { return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1.tv_usec) / 1000); }
+      int elapsed() { return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000); }
       int split() { gettimeofday(&t2,0); return elapsed(); }
   };
 

diff --git a/extra/fastsum.cpp b/extra/fastsum.cpp
@@ -24,8 +24,7 @@ class WallClockTimer {
         t2 = t1;
     }
     int elapsed() {
-        return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-                / 1000);
+        return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
     }
     int split() {
         gettimeofday(&t2, 0);

diff --git a/extra/floatvsint.cpp b/extra/floatvsint.cpp
@@ -35,8 +35,7 @@ class WallClockTimer {
         t2 = t1;
     }
     int elapsed() {
-        return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-                / 1000);
+        return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
     }
     int split() {
         gettimeofday(&t2, 0);

diff --git a/extra/integerlog.cpp b/extra/integerlog.cpp
@@ -23,8 +23,7 @@ class WallClockTimer {
         t2 = t1;
     }
     int elapsed() {
-        return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-                / 1000);
+        return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
     }
     int split() {
         gettimeofday(&t2, 0);

diff --git a/extra/simdspeed.cpp b/extra/simdspeed.cpp
@@ -27,7 +27,7 @@ using namespace std;
       struct timeval t1, t2;
       WallClockTimer() : t1(), t2(){ gettimeofday(&t1,0); t2 = t1; }
       void reset() {gettimeofday(&t1,0); t2 = t1;}
-      int elapsed() { return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1.tv_usec) / 1000); }
+      int elapsed() { return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000); }
       int split() { gettimeofday(&t2,0); return elapsed(); }
   };
 

diff --git a/extra/unrolldeltas.cpp b/extra/unrolldeltas.cpp
@@ -37,8 +37,7 @@ class WallClockTimer {
         t2 = t1;
     }
     int elapsed() {
-        return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-                / 1000);
+        return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
     }
     int split() {
         gettimeofday(&t2, 0);

diff --git a/extra/unrolldeltasSIMD.cpp b/extra/unrolldeltasSIMD.cpp
@@ -42,8 +42,7 @@ class WallClockTimer {
         t2 = t1;
     }
     int elapsed() {
-        return ((t2.tv_sec - t1.tv_sec) * 1000) + ((t2.tv_usec - t1. tv_usec)
-                / 1000);
+        return (t2.tv_sec * 1000 + t2.tv_usec / 1000) - (t1.tv_sec * 1000 + t1.tv_usec / 1000);
     }
     int split() {
         gettimeofday(&t2, 0);