When a timer/interval is set with a specific expiration period, it does not guarantee that the callback will be called exactly after the expiration period. If there are more than one timer which were expired (set with the same expiration period), they will be executed in the order they were set. At the timers phase of the event loop, Node will check the timers heap for expired timers/intervals and will call their callbacks respectively. When you add a timer using setTimeout or an interval using setInterval, Node will add the timer to the timers heap, which is a data structure accessed through libuv. Therefore, for newer Node versions, repeatedly adding events to next tick queue is only discouraged. But this has been removed since Node v0.12 for some reason. This could be manually set by the developers so that Node will process no more than maxTickDepth callbacks from the next tick queue at a given point. You can try setting a finite value as the parameter to addNextTickRecurs and see that setTimeout, setImmediate and fs.readFile callbacks will be called at the end of the process.nextTick call * log messages.īefore Node v0.12, there has been a property called process.maxTickDepth which is used as a threshold to the process.nextTick queue length. In your settings file.You can see the output is an infinite loop of nextTick callback calls, and the setTimeout, setImmediate and fs.readFile callbacks were never called because any of the ‘ omg!…’ messages were printed in the console. Static file name either as a command-line argument or using the flowsFile option You are running on may change its hostname, then you should ensure you provide a Node-RED uses flows_.json as the default flows file. If the Projects feature is enabled, this identifies which project should be started. If the Projects feature is not enabled, this sets the flow file you want to work with. When you deploy your changes, the flows are then started. This allows you to open the flows in the editor and make changes without the flows running. Starts Node-RED without starting the flows. Sets the TCP port the runtime listens on. Node-RED can be started using the command node-red. This by providing the flow file name as argument to the node-red command. The name of the flows file it is using.The location of your Settings file and User Directory.
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