Add a simple timer class

1 files changed, 88 insertions, 0 deletions

diff --git a/checks/timer.cpp b/checks/timer.cpp
new file mode 100644
index 000000000..8b7a6d9be
--- /dev/null
+++ b/checks/timer.cpp
@@ -0,0 +1,88 @@
+#include "timer.h"
+#include <time.h>
+#include <iomanip>
+
+u64bit Timer::get_clock()
+   {
+   struct timespec tv;
+   clock_gettime(CLOCK_REALTIME, &tv);
+   return (tv.tv_sec * 1000000000ULL + tv.tv_nsec);
+   }
+
+Timer::Timer(const std::string& n) : name(n)
+   {
+   time_used = 0;
+   timer_start = 0;
+   event_count = 0;
+   }
+
+void Timer::start()
+   {
+   stop();
+   timer_start = get_clock();
+   }
+
+void Timer::stop()
+   {
+   if(timer_start)
+      {
+      u64bit now = get_clock();
+
+      if(now > timer_start)
+         time_used += (now - timer_start);
+
+      timer_start = 0;
+      ++event_count;
+      }
+   }
+
+u64bit Timer::value()
+   {
+   stop();
+   return time_used;
+   }
+
+double Timer::seconds()
+   {
+   return milliseconds() / 1000.0;
+   }
+
+double Timer::milliseconds()
+   {
+   return value() / 1000000.0;
+   }
+
+double Timer::ms_per_event()
+   {
+   return milliseconds() / events();
+   }
+
+double Timer::seconds_per_event()
+   {
+   return seconds() / events();
+   }
+
+std::ostream& operator<<(std::ostream& out, Timer& timer)
+   {
+   //out << timer.value() << " ";
+
+   int events_per_second = timer.events() / timer.seconds();
+
+   out << events_per_second << " " << timer.get_name() << " per second; ";
+
+   if(timer.seconds_per_event() < 10)
+      out << std::setprecision(2) << std::fixed
+          << timer.ms_per_event() << " ms/" << timer.get_name();
+   else
+      out << std::setprecision(4) << std::fixed
+          << timer.seconds_per_event() << " s/" << timer.get_name();
+
+   if(timer.seconds() < 10)
+      out << " (" << timer.events() << " ops in "
+          << timer.milliseconds() << " ms)";
+   else
+      out << " (" << timer.events() << " ops in "
+          << timer.seconds() << " s)";
+
+   return out;
+   }