Hello all, Node red newbie here. I have two flows that are working and control an esp8266 spa controller(client) and an esp32 fishtank/grow area aquaponic(client). This used to have very low latency.... dashboard has a few switch nodes for troubleshooting l turning on and off of pumps etc. So when I would use the dashboard switch to turn on or off a pump etc it would happen almost instantly.... I have been fiddling around with the flows to make some small changes and now I notice it takes almost 7 seconds for the client to make it happen after the . not sure if this is normal..... using raspberry pi 4 for node red and Mosquitto and the flows have a total of about 125 varying type nodes. Is this normal? or is something going astray? The clients are cycling every 10 seconds.... is this too much? Thanks for any help

By default it should be sorting the processes in the table with the highest CPU at the top. When it starts slowing down see how much CPU is being used by what tasks. A Pi 4 has 4 cores I think the total CPU available is actually 200%. Not sure why. But in your application I wouldn't expect anything much above 10%. [Edit] The processes are the list down the right hand side.

So then I should be fine with the highest use around 2% and the rest .3 and a bunch of 0%?

Absolutely. You should not see anything slow down unless you are getting readings around 80. You said earlier that when it slows down it can take several seconds for an event to be actioned. Is it still true that in those several seconds gap that the readings are still negligible?

Hi Colin, Well it is like it is being blocked..... last time I tested it without the rbe node after the function comparatore in the flow it took like 45 seconds or more for any of the switch nodes to take effect.... also the last time it almost seemed to be random..... like the item would turn off with out me doing anything to the switch node.

[image] Troypearce: Well it is like it is being blocked. The question is, though, what happens to the processor usage in that time?

Hi Colin, I know I dont know what I am doing with node red, linux and the like, But I am a reasonable logical person and have done a whole lot of troubleshooting on many things over the years.... too many hobies. So my idea of logic says it is not mqtt being looped, and it is not the raspberry pi being overwhelmed. so I am not sure but that seems to point to a node-red problem and with my lack of experiance it would seem like I may have a mistake in my flow??? Troy

so I should run those diagnostics you show above when the RBE node is removed to see what may be happening to the mqtt and to the Pi??? Troy

Hi Colin, Just did that and the numbers seem to show a little more cpu use but still under 2%. and the latency is again a problem.....

now it takes about 2 mins to get the action to happen

I think you are saying that during those two minutes the processor usage is still low. If so then add some debug nodes to the flow so you follow the button press (or whatever it is) through the flow and see where it is getting stuck. So for example add a debug on the output of the dashboard button, one on the output of the next node along (or a few nodes along if there are lots, and so on. Give all the debug nodes names so it is easier to follow. Then you should be able to see where along the line it gets stuck. By shrinking the windows a bit you should be able to get the dashboard and the editor on the screen at once.

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Node red flows seem to be slowing down

General

zenofmud 5 April 2020 18:52 43

Your flow can not be imported. Please read this thread and edit your post with a fixed import.

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Node red flows seem to be slowing down

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