Cypress crashes after getting around 2000mb of memory about cypress HOT 23 OPEN

I found a workaround, and it does work which has made me very happy.

All you need to do is run your tests in --headed and it seems to reduce the amount of memory used (I know crazy) but it works and my pipelines are back up and running.

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I also have the same problem, my test would run for 10 minutes and then crash. I have split it up into smaller 'it' blocks and there are 7 of them and it still crashes! This is crazy, I see so many people with the same issue and there is no fix. I have tried both experimentalMemoryManagement and numTestKeptInMemory and nothing works.

I've just joined a new job and created a full regression test suite and it was going so well and now this is happening.

We need a fix.

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I'm having this same issue on Cypress 13.6.4, 13.6.3 and 13.5.0 looks like could be something related to vite or node 20, the snapshots to keep tests in memory are storing an unusual amount of data and overflowing, if I set numTestsKeptInMemory to 1 and check the Memory consuming on Chrome I can see we are storing almost 4000mb, but if I set numTestsKeptInMemory to 0 we get just 150mb

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If anyone could provide a reproducible example, that would be helpful.

You can simulate it by running a simple test over and over.
You will see that in every run the memory grows.
I tested it with a simple "cy,visit("www.twitch.com") command
Open cypress > run the same test over and over > observe the memory grow
Eventually, the cypress crushed.

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Yah, that's unusual. Chrome headless browser has some differences. On Cypress's size, we change things so that it uses LESS memory when in headless for sure, so I wonder if it's some difference with how Chrome --headless runs vs --headed. And also whether it's related to their headless=new changes.

A reproducible example would still be helpful.

This is what I wrote above:
You can simulate it by running a simple test over and over.
You will see that in every run the memory grows.
I tested it with a simple "cy.visit("www.twitch.com") command
Open cypress > run the same test over and over > observe the memory grow
Eventually, the cypress crushed.

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@Tomerlev01 Did you try setting experimentalMemoryManagement to true?

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@Tomerlev01 Did you try setting experimentalMemoryManagement to true?

Yeah, I tried that also, doesn't work.
(This is my other account)

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I got the same problems... cant run a single test in a pipeline :(

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If anyone could provide a reproducible example, that would be helpful.

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Does someone have maybe information about how to solve it?
Maybe I need to provide more details?
Please let me know.

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You can try to add
"numTestsKeptInMemory": 0,
in config.json.
It works after I set.

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I tried it, but still, the crushing is reproduced.
It happened on the "run" mode as well. (the 'numTestsKeptInMemory' doesn't effect this mode)

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If anyone could provide a reproducible example, that would be helpful.

isn't using Windows with Electron browser enough?
I noticed with each spec rising memory and crushing around 4 GB, it might be that my test had a lot of within() clauses and iterating over some items causing to store excessive amount of info (?)
I tried to use a reasonable numTestsKeptInMemory considering my spec has 12 tests, but it did not really help
I seemed to have much less of those since I switched to test in Edge (Chrome seemed to work similar), somehow it splits processes to multiple threads and is separate from Cypress itself
Note I am running on v12.17 and old node

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As I said, this is happening to me when I'm using the headless mode (doing it by running the tests in the 'run' mode).

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I found a workaround, and it does work which has made me very happy.

All you need to do is run your tests in --headed and it seems to reduce the amount of memory used (I know crazy) but it works and my pipelines are back up and running.

Thanks a lot for the hint! You've saved my day! As soon as I switched to headed mode our pipeline came back to normal! Cypress team should invest their time to this issue as this is clearly a performance bug.

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Yah, that's unusual. Chrome headless browser has some differences. On Cypress's size, we change things so that it uses LESS memory when in headless for sure, so I wonder if it's some difference with how Chrome --headless runs vs --headed. And also whether it's related to their headless=new changes.

A reproducible example would still be helpful.

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Im actually having this same issue. Trying with --headed mode on CI seems to work. However Im not being able to reproduce it locally. What I can affirm with certain, however, is that I was not having this issue with v13.6.1. It started happening after I updated, and even by splitting down the tests alot, it still crashes.

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We were facing memory crashes a lot, for us running with CYPRESS_NO_COMMAND_LOG=1 set helped.

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We were facing memory crashes a lot, for us running with CYPRESS_NO_COMMAND_LOG=1 set helped.

Interesting.
I will try that command.
Thanks!

Shame that I will not see the command log for investigation.
But for a stable run, it could be worth it :)

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None of the above solutions worked for my team. We have just a few Cypress E2E tests running in a Github Actions CI pipeline. It would error out with that same message in the OP during the execution of the third or fourth test, without fail.

Turns out our problem had to do with Cypress Cloud. Test Replay was turned on by default when we created our Cypress Cloud project, and that was evidently causing major issues in CI.

Turning off Test Replay in our Cypress Cloud project solved the issue.

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@ndirig Could you provide a link to a URL of a Test Replay in the Cloud where you were facing this issue?

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@ndirig Could you provide a link to a URL of a Test Replay in the Cloud where you were facing this issue?

@jennifer-shehane I'm afraid not. All the CI runs in which I got the FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory error are showing up in Cypress Cloud as "incomplete". Test replay button is disabled with the message "Test Replay is not available. This test timed out."

Not sure if this will do you any good, but here's the URL to the run itself in Cypress Cloud. https://cloud.cypress.io/projects/sf3837/runs/12/test-results

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@ndirig Could you provide the full terminal output? Providing a run with DEBUG log would be ideal to track this down though.

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