karma-runner/karma

Performance issue with serving files in Karma 1.4

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#2,538 opened on Jan 16, 2017

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help wantedneeds: investigation

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Description

Expected behaviour

I have an Ext JS project with over 500 files. With karma 1.3, it was serving all these files in around 3-5s.

karma13

Actual behaviour

With Karma 1.4 and the exact same files, it was taking over 80 seconds to serve these files, which results in a timeout before the tests can even run.

karma14

Environment Details

  • Karma version (output of karma --version): 1.4

Steps to reproduce the behaviour

  1. Simply run npm test with Karma 1.3 and 1.4

Contributor guide

Research direction
Profile the file serving process to identify the bottleneck introduced in version 1.4.
Tech stack
javascript
Domain
testing
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitNode.js
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65