A very basic, but rather exact profiler. It uses QueryPerformanceCounter. Perhaps I shouldn’t even call this profiler, because a profiler typically keeps track of the parts of code it measures. So let’s call it a precise stopwatch. Well, anyways, here’s the code:

using System.Runtime.InteropServices;

namespace SimpleProfiler
{
    public class Profiler
    {
        long mFrequency;

        long mAccumulatedTime;
        long mStartTime;
        long mEndTime;

        long mLastTime;

        bool mInitialized = false;
        bool mRunning = false;

        public Profiler()
        {
            mInitialized = QueryPerformanceFrequency(out mFrequency);
        }

        public bool StartMeasure()
        {
            if (mInitialized && !mRunning)
            {
                mRunning = true;
                return QueryPerformanceCounter(out mStartTime);
            }

            return false;
        }

        public bool StopMeasure()
        {
            if (mInitialized && mRunning)
            {
                mRunning = false;
                bool bSuccess = QueryPerformanceCounter(out mEndTime);

                if (bSuccess)
                {
                    mLastTime = mEndTime - mStartTime;
                    mAccumulatedTime += mLastTime;
                    return true;
                }
            }

            return false;
        }

        public double GetLastTime()
        {
            return (double)((double)mLastTime / (double)mFrequency);
        }

        public double GetAccumulatedTime()
        {
            return (double)((double)mAccumulatedTime / (double)mFrequency);
        }

        [DllImport("kernel32.dll")]
        private static extern bool QueryPerformanceCounter(out long count);

        [DllImport("kernel32.dll")]
        private static extern bool QueryPerformanceFrequency(out long frequency);
    }
}

which is also contained in the source code for the previous article.