Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Snapshotting still occurs when numTestsKeptInMemory is 0

See original GitHub issue

Current behavior:

When running cypress in GUI mode with numTestsKeptInMemory set to 0, snapshotting still occurs even though none of them should be kept in memory. This has a negative impact on performance and memory consumption.

In this screenshot, you can see that `numTestsKeptInMemory` is `0`, but 5 seconds is spent taking snapshots that will not be used.

Screen Shot 2019-05-03 at 12 35 28 PM

In this screenshot you can see where the majority of the snapshot execution took place, 3.4s converting rules from large stylesheets into a string, and 0.4s replacing URLs in those strings with absolute paths.

Desired behavior:

When running with numTestsKeptInMemory set to 0, snapshotting should be avoided in the same way that occurs while running in headless mode.

https://github.com/cypress-io/cypress/blob/develop/packages/driver/src/cypress/log.coffee#L262-L266

Steps to reproduce:

Set numTestsKeptInMemory to 0.
Run cypress GUI mode.

Versions

Cypress: 3.2.0 Chrome: Chrome 74

Issue Analytics

State:
Created 4 years ago
Comments:6 (4 by maintainers)

Top GitHub Comments

1reaction

brian-manncommented, May 17, 2019

I’ll take this PR from here and we’ll get it out in the next patch release or so.

1reaction

jennifer-shehanecommented, May 3, 2019

Hey @CoryDanielson, can you take a look at your resolved configuration and confirm that the numTestsKeptInMemory configuration is being read as set to 0? https://on.cypress.io/configuration#Resolved-Configuration

Top Results From Across the Web

cypress-io/cypress - Gitter

well setting numTestsKeptInMemory to 0 will prevent the snapshot from being stored... but there could be many other things that consume memory. sun-stream....

Cypress long automation script crashes the Chrome browser ...

At 0 you will not get any DOM snapshots. The memory usage will still climb, but it will climb at a much slower...

Configurations in Cypress and How to Disable Default ...

numTestsKeptInMemory, 50, This configuration specifies the number of tests for which we keep the snapshots and the command data in memory.

Configuration - Cypress Documentation

numTestsKeptInMemory, 50, The number of tests for which snapshots and command ... between 0 and 51 , where a lower value results in...

Scheduled & distributed Cypress tests for multiple ... - habx

baseUrl}} numTestsKeptInMemory=0 ... We still had bugs that did occur in production, mostly because of a different set of data, ...