use chrono in vbench

2 files changed, 8 insertions, 8 deletions

diff --git a/vbench/src/vbench/core/timer.cpp b/vbench/src/vbench/core/timer.cpp
index 9eda0fdf7ce..5e934f59275 100644
--- a/vbench/src/vbench/core/timer.cpp
+++ b/vbench/src/vbench/core/timer.cpp
@@ -5,21 +5,22 @@
 namespace vbench {
 
 Timer::Timer()
-    : _time()
+    : _zero(clock::now())
 {
-    reset();
 }
 
 void
 Timer::reset()
 {
-    _time.SetNow();
+    _zero = clock::now();
 }
 
 double
 Timer::sample() const
 {
-    return (_time.MilliSecsToNow() / 1000.0);
+    using seconds = std::chrono::duration<double>;
+    seconds seconds_since_zero = (clock::now() - _zero);
+    return seconds_since_zero.count();
 }
 
 } // namespace vbench
diff --git a/vbench/src/vbench/core/timer.h b/vbench/src/vbench/core/timer.h
index 19ddbc9db99..fbb7b6f10ef 100644
--- a/vbench/src/vbench/core/timer.h
+++ b/vbench/src/vbench/core/timer.h
@@ -2,7 +2,7 @@
 
 #pragma once
 
-#include <vespa/fastos/time.h>
+#include <chrono>
 
 namespace vbench {
 
@@ -12,8 +12,8 @@ namespace vbench {
 class Timer
 {
 private:
-    FastOS_Time _time;
-
+    using clock = std::chrono::steady_clock;
+    clock::time_point _zero;
 public:
     Timer();
     void reset();
@@ -21,4 +21,3 @@ public:
 };
 
 } // namespace vbench
-