Ancient Bug Discovered in the Visual Metrics Processing Script
Recently, we had an odd regression in our page load tests. You can find that bug here. The regression was quite large, but when a developer investigated, they found that … Read more
Gregory Mierzwinski
Improving the Test Selection Experience with Mach Try Perf
If you’ve ever tried to figure out what performance tests you should run to target some component, and got lost in the nomenclature of our CI task names, then you’re … Read more
Migrating to Browsertime for Performance Testing
Originally, we used a Web Extension for doing performance testing on Firefox in our Raptor test harness. But, we needed to add new features such as visual metrics, so in … Read more
Reworking our Visual Metrics Processing System
Our visual metrics processing system used to use two separate machines to produce visual metrics from our pageload tests. In this post, I’ll describe how we moved to a single-machine … Read more
Using the Mach Perftest Notebook
In my previous blog post, I discussed an ETL (Extract-Transform-Load) implementation for doing local data analysis within Mozilla in a standardized way. That work provided us with a straightforward way of … Read more
Dynamic Test Documentation with PerfDocs
After over twenty years, Mozilla is still going strong. But over that amount of time, there’s bound to be changes in responsibilities. This brings unique challenges with it to test … Read more
Mach Perftest Notebook
Today at Mozilla, we constantly run “one-off” tests whose data always requires further analysis. The techniques used to analyze the data from these tests are quite similar to each other … Read more
Greg Mierzwinski [:sparky]
I’m Greg Mierzwinski ([:sparky] on Riot), and I am a Performance Test Engineer working on the Performance Testing (perftest) team led by Dave Hunt. I work on various components, but … Read more