Dashboard crashing - EMFILE error

Dashboard
1

Hello,

When I activate a loop (30 process of about 500 ms), that simulate a CAN network, I get the following error and my dashboard become inactive (connection lost):

27 Feb 12:38:06 - [info] [exec:40bcec03.751834] error:Error: spawn /bin/sh EMFILE
27 Feb 12:38:06 - [info] [exec:40bcec03.751834] error:Error: spawn /bin/sh EMFILE
27 Feb 12:38:15 - [info] [exec:40bcec03.751834] error:Error: spawn /bin/sh EMFILE

For information, I am subscribing to an MQTT broker.
Previously, I didn't have this behaviour but as I added more flows, the EMFILE error occured.

Research lead me to it being a node.js related issue about having "too many open file".
However when I ran:

lsof -i -n -P | grep node

I only find 4 to 5 process, well bellow the limit 1024

ulimit -a | grep files
open files                      (-n) 1024

What in my usage of node-red may lead to its issue?
How could I fix the issue?

2

What is the command in the exec node?

3

I don't know what exec node is a tthe origin of the error.
I got the id that is alocated to the node in the log. Yet I don't know how to find which node it refer to.

4

Have you got a lot of them in subflows?
If you put a debug node in parallel with each one logging something to the console then you may be able to work out out from looking in the log.

5

in the editor you should be able to use ctrl or cmd - f to search - in your case for the node id - 40bcec03.751834

6

I think I have got my threads crossed, I thought that had already failed due to it being in a subflow. I think that was a different thread though.

7

I could find the node causing the error. However the node in question work previously, it is the fact that I add more flow/node (all unrelated), which causes an error.

The error seems to be coming from my environment limitation. (an ubuntu VM in virtualBox)
I try the same project on a linux desktop (ubuntu too), and did not encounter any issue.

Somehow this issue is related to computer power. :sob:

8

What does the exec node do?

9

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