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Category: Electronics Engineering

Qualcomm vs. Intel CPU comparison

One of the nicer perks I have here at Cloudflare is access to the latest hardware, long before it even reaches the market. Until recently I mostly played with Intel hardware. For example Intel supplied us with an engineering sample of their Skylake based Purley platform back in August 2016, to give us time to evaluate it and optimize our software. As a former Intel Architect, who did a lot of work on Skylake (as well as Sandy Bridge, Ivy…

Research could ‘untangle’ vexing problem in computer-simulation technology

Untangling quadrilateral meshes using locally injective mappings. Credit: Krishnan Suresh The computer simulations used to design, optimize, test or control a vast range of objects and products in our daily lives are underpinned by finite element methods. Finite element simulations use a mesh of geometric shapes—triangles, tetrahedra, quadrilaterals or hexahedra, for instance. These shapes can be combined to form a mesh that approximates the geometry of a model. For example, meshes can be used to model the human knee in…

Adding card on file details with Python – Square Corner Blog – Medium

Attaching a customer’s card on file to their Square profile is an important part of setting up recurring payments. Here’s how to do it with Python. In this post we’ll be using the CustomerCard endpoints to add a card on file to a customer that you could then use for subscription billing online or in-person. But remember, you should not link a card on file to a customer without the customer’s express permission. For example, you can include a checkbox in…

Convert Website Traffic into Leads with these 5 Tips

Digital marketing is one of the best ways to advertise and market your company in today’s world. With the growing popularity of the internet and then using it as a platform to showcase your company, digital marketers are finding it easy to create a presence on the internet. But at the same time due to the constant use of the internet as a channel for promoting a company, it is growing increasingly difficult to create a lot of hype for…

Perfect locality and three epic SystemTap scripts

In a recent blog post we discussed epoll behavior causing uneven load among NGINX worker processes. We suggested a work around – the REUSEPORT socket option. It changes the queuing from “combined queue model” aka Waitrose (formally: M/M/s), to a dedicated accept queue per worker aka “the Tesco superstore model” (formally: M/M/1). With this setup the load is spread more evenly, but in certain conditions the latency distribution might suffer. After reading that piece, a colleague of mine, John, said:…

FRP at Kickstarter and Kotlin – Kickstarter Engineering

If you’ve browsed the code for our open source iOS or Android apps, you may have noticed that we try to follow Functional Reactive Programming (FRP) patterns wherever possible. For an introduction to FRP, I recommend this explainer from Dan Lew. It’s a paradigm that we have followed in our mobile apps for years now and has helped us write clear code with minimal bugs. One of the main benefits of this pattern is it allows us to push all…

Upgrading Kickstarter to Rails 5 – Kickstarter Engineering

Fall is here! Change is in the air. And as of last month, Kickstarter runs its two biggest applications on Rails 5: our payments app, Rosie, and our main app, Kickstarter. In this post, we’ll concentrate on the Kickstarter Rails 5 upgrade. We update our apps because we want to ensure the security and performance of our site — but getting to the next major Rails version on a nine-year-old legacy application was no easy feat. We’d like to share some of…

The principle of optical illusions technically imitated in electronic circuit

Marina Ignatov, a doctoral researcher in electrical engineering and lead author of the publication, shows an electronic circuit with which the perception processes of the human brain can be imitated. Electrical oscillators assume the function of the neurons. Memristive components are able to store electrical states, and to simulate synapses in the brain which link the nerve cells together. Credit: Julia Siekmann, CAU The human brain must cope with a large variety of information simultaneously so we can orientate ourselves…