Hi there, I have the issue with empty feeder when running my simulations. So, the file has headers and one simulation writes into that file, and another one reads those info and uses during simulation. So I don’t want to use child. I’m using circular mode in the feeder, so I am not sure why I’m ge…

Hi @evalalos , Did you try with batch + circular? And when there is at least some data in the csv? (the header should be present at the Simulation instanciation, and data should be present before the first call to feed) Can you create a SCCE and share it with us? Cheers!

Hello! Indeed batch + circular fixed the issue. I don’t know why it won’t work with circular only, I’ll try to explain as best as I can: So the simulation1 starts with 1 virtual user and creates some data and writes that data into csv file, simulation2 waits for 10 minutes and after that starts w…

Yes, I met all suggestions from the answer, but after some time, it stopped working.

[image] evalalos: I don’t know why it won’t work with circular only, I’ll try to explain as best as I can: Please read the documentation: Gatling - Feeders Without batch, when the file is small, it’s loaded once in memory on boot so Gatling doesn’t have to perform slow filesystem access duri…

And that being said, honestly, I think it’s a bad solution to use a file as a buffer for communicating between virtual users in 2 different scenarios, in particular when the data fits in memory. What I would do (assuming the consumer scenario starts only once the producer scenario terminates, using…

Hey, really appreciate your help! No, the simulation2 should start after 10 minutes, not after the simulation1 finishes, thats why I cannot use andThen method. This is the use case, so I have to follow it :slight_smile: Thanks a lot once again.

My suggestion is still valid. It’s just that you might have to deal with the possibility that your consumer is faster than your producer and might end up with an empty buffer at some point.

[image] slandelle: It’s just that you might have to deal with the possibility that your consumer is faster than your producer and might end up with an empty buffer at some point. Yes, I agree. I will think about reimplementing and using andThen

Feeder csv(code.csv) is now empty, stopping engine

Gatling (Open-Source)

slandelle November 28, 2023, 4:26pm 3

@evalalos Isn’t that the same question you’ve asked and got an answer for a few months ago? Requirement failed: Feeder source is empty - #2 by sbrevet

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Use single feeder file for multiple feeder objects. Gatling (Open-Source)	1	258	April 11, 2019
Feeder is empty while running the Child Simulation Gatling (Open-Source)	2	198	December 30, 2021
Gating Feeder circular strategy not working on 3.9 gatling version Gatling (Open-Source)	8	995	January 3, 2023
Feeder Gatling (Open-Source)	2	232	November 28, 2020
Requirement failed: Feeder source is empty Gatling (Open-Source)	2	598	May 8, 2023

Feeder csv(code.csv) is now empty, stopping engine

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