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Mozilla: SpiderMonkey and Filter Treeherder Development

Submitted by Roy Schestowitz on Friday 3rd of July 2020 09:45:14 PM Filed under
Moz/FF
  • SpiderMonkey Newsletter 5 (Firefox 78-79)

    SpiderMonkey is the JavaScript engine used in Mozilla Firefox. This newsletter gives an overview of the JavaScript and WebAssembly work we’ve done as part of the Firefox 78 and 79 Nightly release cycles.

    If you like these newsletters, you may also enjoy Yulia’s weekly Compiler Compiler live stream, a guided tour of what it is like to work on SpiderMonkey and improve spec compliance.

  • In Filter Treeherder jobs by test or manifest path I describe the feature.

    In Filter Treeherder jobs by test or manifest path I describe the feature. In this post I will explain how it came about.
    I want to highlight the process between a conversation and a deployed feature. Many times, it is an unseen part of the development process that can be useful for contributors and junior developers who are trying to grow as developers.
    Back in the Fall of 2019 I started inquiring into developers’ satisfaction with Treeherder. This is one of the reasons I used to go to the office once in a while. One of these casual face-to-face conversations led to this feature. Mike Conley explained to me how he would look through various logs to find a test path that had failed on another platform (see referenced post for further details).
    After I understood the idea, I tried to determine what options we had to implement it. I wrote a Google Doc with various alternative implementations and with information about what pieces were needed for a prototype. I requested feedback from various co-workers to help discover blind spots in my plans.
    Once I had some feedback from immediate co-workers, I made my idea available in a Google group (increasing the circle of people giving feedback). I described my intent to implement the idea and was curious to see if anyone else was already working on it or had better ideas on how to implement it. I did this to raise awareness in larger circles, reduce duplicate efforts and learn from prior work.
    I also filed a bug to drive further technical discussions and for interested parties to follow up on the work. Fortunately, around the same time Andrew Halberstadt started working on defining explicitly what manifests each task executes before the tasks are scheduled (see bug). This is a major component to make the whole feature on Treeherder functional. In some cases, talking enough about the need can enlist others from their domains of expertise to help with your project.

  • Filter Treeherder jobs by test or manifest path

    This feature is useful for developers and code sheriffs because it permits them to determine whether or not a test that fails in one platform configuration also fails in other ones. Previously, this was difficult because certain test suites are split into multiple tasks (aka “chunks”). In the screenshot below, you can see that the manifest path devtools/client/framework/browser-toolbox/test/browser.ini is executed in different chunks.

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