Tag: engineering

How Disqus Went Realtime with 165K Messages Per Second and Less than .2 Seconds Latency

How do you add realtime functionality to a web scale application? That’s what Adam Hitchcock, a Software Engineer at Disqus talks about in an excellent talk: Making DISQUS Realtime (slides). Disqus had to take their commenting system and add realtime capabilities to it. Not something that’s easy to do when at the time of the talk (2013) they had had just hit a billion unique visitors a month. What Disqus developed is a realtime commenting system called “realertime” that was tested to handle 1.5 million concurrently connected users, 45,000 new connections per second, 165,000 messages/second, with less than .2 seconds latency end-to-end. The nature of a commenting system is that it is IO bound and has a high fanout, that is a …

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How Disqus Went Realtime with 165K Messages Per Second and Less than .2 Seconds Latency

Moonviews

The Hackers Who Recovered NASA’s Lost Lunar Photos, Wired “Sitting incongruously among the hangars and laboratories of NASA’s Ames Research Center in Silicon Valley is the squat facade of an old McDonald’s. You won’t get a burger there, though-its cash registers and soft-serve machines have given way to old tape drives and modern computers run by a rogue team of hacker engineers who’ve rechristened the place McMoon’s. These self-described techno-archaeologists have been on a mission to recover and digitize forgotten photos taken in the ’60s by a quintet of scuttled lunar satellites. The Lunar Orbiter Image Recovery Progject has since 2007 brought some 2,000 pictures back from 1,500 analog data tapes. They contain the first high-resolution photographs ever taken from behind the lunar horizon…

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Moonviews

Paul Parisi’s Biography

Paul Parisi’s Biography

I was born into a family of engineers and entrepreneurs. Being exposed to that kind of stuff growing up really makes an impact. In 1968, when I was only four, one of my brothers built a television camera and transmitter and put little old me on TV. Our family basement was a playground for all things technology. From making sand cast molds and making parts out of molten metals to bending Plexiglas and flame grinding it to perfection to drawing plans for our next project on a real drawing board using mechanical pencils and protractors to developing a small audio electronics company while in junior high school, building a graphic equalizer and audio noise reduction systems including full metal cases and front panels with professional labeling and high-tech finishes to photography, making our own chemicals and experimenting with new imaging technologies, to running a manufacturing plant in our garage making tools for injection molding machines. To be able to try to do anything you could think of and most of the time actually succeeding! Cool!

And then along came computers, less physical and more virtual. My first program in 9th grade was a BASIC program to help design audio amplifiers. It was run on the teletype of school systems connection to a shared regional mini-computer. My second was an AI like system on top of the audio amplifier program which would interview the user and interactively design the amplifier circuit. I remember running a Timex Sinclair ZX-80 until in melted calculating various mathematical functions for weeks at a time. Computers were cool.

As the years have raged on I have been there from the first Macs and PCs and getting them to talk to each other right down to today where computing is becoming so ubiquitous, I have a computer in my car that helps me manage my life proactively.

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