static async Task Main(string[] args)
{
RuntimeHelper.PrintConfiguration();
int numTasks = int.Parse(args[0]);
TimeSpan sleepDelay = TimeSpan.FromSeconds(double.Parse(args[1]));
long maxHits = long.Parse(args[2]);
// NB: This sets the "start time" of the first scoreboard message.
var scoreboard = new Scoreboard();
// Warning: This fires off a ton of tasks and they will start doing work
// while we are still constructing other tasks. This is non-deterministic
// and in theory produces "thundering herds". Isn't benchmarking
// parallel code fun?
//
// However, we are not as concerned with wall-clock time as we are about
// measuring total memory usage and CPU time.
//
// But you probably don't want to run this test with a sleepDelay
// too low and completely saturate your CPU cores, and thus starve
// this creation loop. You should verify that the first scoreboard message
// shows a reasonable "elapsed" time.
//
for (var i = 0; i < numTasks; i++)
{
// Note: We used to add this to a list, but that is not necessary.
// Note: We assign to a variable just to supress a compiler warning
// that we aren't using await here.
#if USE_TASK_RUN_LAMBDA
// Warning: Task.Run() with a lambda closure adds mem/cpu overhead
// (+10% CPU, +20% memory on a short 10 second test)
var task = Task.Run(() => WorkTask(scoreboard, sleepDelay));
#else
var task = WorkTask(scoreboard, sleepDelay);
#endif
}
await scoreboard.PollScores(maxHits);
}
public async Task PollScores(long maxHits)
{
while (true)
{
DateTime currentTime = DateTime.UtcNow;
TimeSpan elapsed = currentTime - lastDumpTime;
long totalHits = Interlocked.Read(ref hitCount);
Console.WriteLine($"elapsed={elapsed} totalHits={totalHits}");
RuntimeHelper.PrintMemoryInfo();
lastDumpTime = currentTime;
if (totalHits >= maxHits)
{
Environment.Exit(0);
}
// Sleep for 1/10 of a second to keep precision reasonable
await Task.Delay(TimeSpan.FromSeconds(0.1));
}
}