Performance Sheriff Newsletter (November 2020)
In November there were 324 alerts generated, resulting in 54 regression bugs being filed on average 6.8 days after the regressing change landed. Welcome to the November 2020 edition of … 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
Performance Sheriff Newsletter (October 2020)
In October there were 202 alerts generated, resulting in 25 regression bugs being filed on average 4.4 days after the regressing change landed. Welcome to the second edition of the … 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
Performance Sheriff Newsletter (September 2020)
In September there were 153 alerts generated, resulting in 25 regression bugs being filed on average 7.8 days after the regressing change landed. Every time code is pushed to autoland … Read more
Four pillars of Android performance
This summer, I had the pleasure of interning at Mozilla with the Android Performance Team. Previously, I had some experience with Android, but not particularly with the performance aspect except … Read more
Improving Firefox Startup Time With The about:home Startup Cache
Don’t bury the lede We’re working on a thing to make Firefox start faster! It appears to work! Here’s a video showing off a before (left) and after (right): … Read more
What’s new in Perfherder?
Perfherder is one of the primary tools used by our performance sheriffs to triage and investigate regression (and improvement) alerts. It’s also a key part of the workflow any Firefox … Read more
Improving Firefox Page Load
Introduction Over the summer of 2018 we formed a new performance team at Mozilla. Our first objective was to better understand what performance means to our users.. We talked to … Read more
Profiling media workloads in Firefox
It will come as no surprise that playing video and audio in a web browser requires a certain attention to performance. Whether it is by getting the design right, using … 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