OnExecutionUpdate() Timing Clarification

[caveat_lector]

I have thought that OnExecutionUpdate() is called immediately after each broker confirmation of order execution. However, while testing an unmanaged strategy that I have developed using the Playback Historical capability and with the Primary Data Series being 15-second bars and the Secondary 1-tick data OnExecutionUpdate() is called only at 15-second intervals. Is that due to a Playback Historical testing limitation or have I misunderstood when OnExecutionUpdate() is called? There obviously is no way to know how long order confirmations would have taken, but I had assumed that the test system would either immediately confirm following the crossing of a limit price level, for example, or would confirm after a short random delay period to approximate reality.

[caveat_lector]

I just noticed the OnExecutionUpdate() Help states:

"Playback connection triggers executions immediately, for the sake of consistency in backtesting. Because of this, OnExecutionUpdate() can appear to be triggered earlier than it would in live trading, or when simulation trading on a live connection."

That isn't what I am seeing. OnExecutionUpdate() is always called 15-seconds after the close of a bar that crosses an order limit price, so order execution confirmations are always 15 to 30 seconds later than would have occurred real-time, depending on exactly when during a 15-second bar a price limit was crossed.

[NinjaTrader_ChrisL]

Hi caveat_lector, thanks for your post.

I wanted to let you know I'm testing code behavior and will reply when I have an answer.

Thanks in advance for your patience.

[NinjaTrader_ChrisL]

Hi caveat_lector, thanks for your patience.

I'm not seeing the same thing on my side. Heres a video and I also attached my test script.

https://clauber.tinytake.com/tt/NDE4ODM1MV8xMzAxMzc4NA

Please let me know if this does not resolve your inquiry.

[caveat_lector]

Thanks very much for the time you spent on that. I will compare your script and video to what I am doing and seeing.

[caveat_lector]

Sorry, my mistake. I was using:

Print(execution.Name + " " + Time[0] + "." + Time[0].Millisecond + " Time Series");

Instead of:

Print(execution.Name + " " + Times[1][0] + "." + Times[1][0].Millisecond + " Time Series");