I am new to Node-RED. I found that all javascript codes written in the node are processed in sequence in a flow (even using async function like setTimeout etc). This is also the same case among flows. Is Node-RED single threaded? Is there any setting to make Node-RED multiple threaded? If Node-RED…

Hi @fangzhu Node.js is single-threaded so only executes one piece of code at any time. However it uses its event loop to handle multiple workloads at the "same" time; whenever one event fires off some async work the next event can be handled. Node-RED uses that same event loop to run the flows. If…

Hello knolleary, Thanks for your quick response. I am a beginner, I might have done things in a wrong way. I tried to simulate the scenario using 2 very simple flows: [image] When I triggered start1 then immediately triggered start2, I was expecting the nodes to be processed in a sequence of s…

The sleep function you have created stops node.js from doing anything else: function sleep(millis) { var date = new Date(); var curDate = null; do { curDate = new Date(); } while(curDate-date < millis); } This is because it is entirely synchronous code - it never gives control back to the node…

[image] knolleary: Also please read the post @ukmoose linked to - I had to manually repair your flow before I could import it to look. This comes up a lot, I certainly fell into the first time I tried to post a sample. I'm wondering why this forum doesn't have a "code" tag to use when pastin…

Rather than backticks, the other option is to use the code block format which achieves the same thing. It's right there in the toolbar and yet still gets ignored. [Can_node-red_node_flow_run_in_parallel__-General-_Node-RED_Forum] The disadvantage of that button is that it indents your content by 4…

I tried that, it didn't seem to work I'll try again: [ { "id": "6d1d25e2.4e534c", "type": "mqtt in", "z": "6d590249.a8763c", "name": "Garage Door Alert", "topic": "Alarm/GarageDoorAlert", "qos": "1", "broker": "fd073680.473468", "x": 130, "y": 1560, "wires": [ [ "b2d4636f.2287c" ] ] …

[image] wb666greene: Might I suggest changing the the "tool tip" to be "code insertion" or something even clearer? I'm sure you could suggest it to discourse who produce the forum software.

I suggest you to use the delay module in Node Red. Remember you can reset the message inside (in means after the delay will not be output) by sending an object containing only reset:1 I use only this on my flows, it saves me from code troubles

Thanks for the reply. I was just trying to evaluate Node-Red's behavior. sleep was not a thing that I wanted to do. Instead I tried to simulate the scenario that a "function node" needs to process a lot of logic using javascript and I found that will stop other flows (even using setTimeout, it can …

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Can node-red node/flow run in parallel?

General

ukmoose 7 February 2019 12:01 4

Unfortunately your flow isn't currently importable.Please read the following post How to share code or flow json and then edit the above message.

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Can node-red node/flow run in parallel?

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