karma-runner/karma

Performance issue with serving files in Karma 1.4

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#2,538 创建于 2017年1月16日

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 (2 评论) (0 反应) (0 负责人)JavaScript (11,918 star) (1,703 fork)batch import
help wantedneeds: investigation

描述

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

贡献者指南

技术栈
javascriptnodejs
领域
testingperformance
议题类型
performance
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-2 days
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
Familiarity with Node.js streamsUnderstanding of Karma's middleware architecture
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
30
研究方向
Investigate the file serving middleware in Karma, particularly the changes between versions 1.3 and 1.4. Look at files like `lib/middleware/file.js` and `lib/middleware/source files.js`. Profile the serving process to identify bottlenecks. Check if any new dependencies or changes in file handling (e.g., streams, compression) caused the delay. Comments in the issue may hint at a known regression.
Performance issue with serving files in Karma 1.4 · karma-runner/karma#2538 | Good First Issue