I am trying to benchmark I/O performance on a number of embedded platforms (Arduino, Pi, Beaglebone). Currently Node-RED on the Pi 4 is giving me very low numbers (under 2,000 transitions per second) and I am not sure if it is my flow or that Node-RED is not really built to do this sort of thing wel…

Picture of my flow [Flow digial IO on Pi4 benchmark]

[image] dpnsw: JSON for my flow is: [{"id":"1ae67599.25720a","type":"function","z":"82f1d13f.bdbbc","name":"Measure Test","func":"var MTEndTime = new Date().getTime();\nflow.set("EndTime",MTEndTime)\nvar Duration = MTEndTime - flow.get("StartTime");\nmsg.payload = Duration;\nmsg.speed = 5000 / …

When you say you are trying to measure I/O performance, what you are actually measuring is the overheads in the code used to read the I/O, not the I/O itself. Node red will always be vastly slower than Python code reading the pin directly. So I am not sure exactly what you are trying to measure wi…

Attached actual flow.My Mistake Node-RED-Pi4-IO-Benchmark.json (2.9 KB)

Hi Colin, I am trying to determine the fastest possible response time under Node-RED so I can understand what it can be used for and what it cannot. I plan to run the same flow on a number of BeagleBones as well. Most specifically I want to understand how quickly I can expect Node-RED to query a s…

[image] dpnsw: Attached actual flow.My Mistake That isn't what the linked post said to do to share your post.

I see you are using a non-standard node (the counter loop node), is that a good idea if you are benchmarking? What is it? node-red-contrib-something probably.

@Colin it is node-red-contrib-loop-processing

[image] dpnsw: doing the same thing under python [image] Colin: what you are actually measuring is the overheads I suspect that @Colin is right, but it could be worth trying to make a more direct comparison. Your python program may well be using the same library to communicate with the…

I followed the link read the thread and went with the 2nd post in that thread by Paul-Reed. I now see you wanted only the first option so sorry about that.

I/O switching performance on a Raspberry Pi 4

General

afelix 25 April 2020 12:58 3

Please read How to share code or flow json first, then select all nodes on your flow that you would like to share, and export it. The code you've here is only the function node named 'Measure Test'.

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I/O switching performance on a Raspberry Pi 4

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