It is so popular that more than one in three people in the U.S. use it monthly, according to Facebook. Flipping for Profit: Meet the Couple Making Six Figures by Reselling Ryan and Allison Roots are full-time resellers -- they take new and used items, mark them up, and sell them online for a profit. Because Facebook started as a platform for people who knew each other, its Marketplace—at least in theory—operates on the notion that on the other side of every online deal is a real person with a network of friends and...
Software Engineer, Android To help personalize content, tailor and measure ads, and provide a safer experience, we use cookies. The Facebook apps for Android and iOS are used by billions of people across the world. LONDON, UNITED KINGDOM We’re very excited to see where we can take these ideas and tools with the help of the community and make mobile performance a much more tractable problem. TEL AVIV, ISRAEL While we had a pretty good idea of how long different subsections within it took (along with a solid set of secondary, related metrics), regressions took a long time to root-cause and triage and often remained unsolved for months. By collecting rich streams of telemetry, it also enables new types of causality analyses, as well as a much more precise understanding of metrics such as “scroll fluidity” and “app responsiveness.”Before Profilo, our cold app startup was a very difficult metric to understand and maintain. Together, these mean that, among other things, we need to quickly and efficiently investigate performance problems.Every engineering team at Facebook is encouraged to monitor app performance using common tools and frameworks within our family of apps. Android Software Engineer
The focus on high throughput has allowed us to collect telemetry at rates of 3000 events per second or more, with minimal disruption or distortion of the underlying interaction.It also provides us with a powerful configuration system we use to enable telemetry collection from specific devices, without overburdening the apps of all users.
When we first developed tools that allowed us to view performance changes over time, we discovered many low-hanging opportunities: cases where we gathered new insight on how our app behaved in practice, as well as other “easy” issues. BELLEVUE, US Profilo: Understanding app performance in the wild. Other telemetry streams allow us to tackle different types of common regressions such as more code being loaded or slow paths becoming more frequent.One of the unique features of Profilo is its custom Java stack unwinder. We often knew the overall metric regressed, but we couldn’t pinpoint why.Further, the variation of performance conditions and system behaviors we find “out in the wild” of real-world deployment made app performance investigations one of our most difficult and time-consuming engineering challenges.Early on, regression management followed a simple workflow. In practice, this means that with a few lines of code we can collect telemetry information from a new feature, along with centralized reporting, data pipeline management, and tools to work with aggregate data.The ability to monitor for regressions and explore changes over time has been an important part of our mobile performance efforts. We’ve created in-depth telemetry to explain a large chunk of our resource usage (CPU time), gained a much deeper understanding of our relationship with the VM, and enabled new, more intricate analyses of hard performance metrics like “app responsiveness.”As part of the open source release, we’re also releasing basic tooling to work with traces and some example analyses to give you a feel for the workflow. Android Software Engineer
Must win.....I would say so. The change is mostly in frequency, not duration, but on average results in a ~15ms shift from “partial” to “sticky” collection.These and other telemetry streams have changed how we think about regression detection and performance analysis for our mobile apps. Through reselling, mentoring aspiring resellers, and growing a YouTube following, the couple says they’re bringing in six figures.
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