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Showing posts from February, 2016

SSD reliability in the real world: Google's experience

http://www.zdnet.com/article/ssd-reliability-in-the-real-world-googles-experience/ SSDs are a new phenomenon in the datacenter. We have theories about how they should perform, but until now, little data . That's just changed. The FAST 2016 paper Flash Reliability in Production: The Expected and the Unexpected, (the paper is not available online until Friday) by Professor Bianca Schroeder of the University of Toronto, and Raghav Lagisetty and Arif Merchant of Google, covers: Millions of drive days over 6 years 10 different drive models 3 different flash types: MLC, eMLC and SLC Enterprise and consumer drives Key conclusions Ignore Uncorrectable Bit Error Rate (UBER) specs. A meaningless number. Good news: Raw Bit Error Rate (RBER) increases slower than expected from wearout and is not correlated with UBER or other failures. High-end SLC drives are no more reliable that MLC drives. Bad news: SSDs fail at a lower rate than disks, but UBER rate is higher (see be...
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Why there is no Hitchhiker’s Guide to Mathematics for Programmers

http://jeremykun.com/2013/02/08/why-there-is-no-hitchhikers-guide-to-mathematics-for-programmers/ Why there is no Hitchhiker’s Guide to Mathematics for Programmers Posted on February 8, 2013 by j2kun For those who aren’t regular readers: as a followup to this post, there are four posts detailing the basic four methods of proof, with intentions to detail some more advanced proof techniques in the future. You can find them on this blog’s primers page . Do you really want to get better at mathematics? Remember when you first learned how to program? I do. I spent two years experimenting with Java programs on my own in high school . Those two years collectively contain the worst and most embarrassing code I have ever written. My programs absolutely reeked of programming no-nos . Hundred-line functions and even thousand-line classes, magic numbers, unreachable blocks of code, ridiculous code comments, a complete disregard for sensible object orientation, neglige...
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Bilingual Kids Are Way Better At Thinking Outside The Rules

http://www.fastcoexist.com/3056328/bi-lingual-kids-are-way-better-at-thinking-outside-the-rules Bilingual Kids Are Way Better At Thinking Outside The Rules Switching between two languages builds brain flexibility skills. Want your kids to be creative problem solvers? Teach them another language early in life. Top Photo: Iain Masterton/Getty Images Charlie Sorrel 02.08.16 11:12 AM Toddlers that are learning two languages are also learning another skill: how to look at problems in creative new ways. If they have experience switching between languages, then they'll be even better. The key, says a new study , is this switching. Both bilingual and monolingual kids were studied at 24 months, and then again, seven months later, to asses their v...
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Manajemen Rapat

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Unobtainium

https://literaryreview.co.uk/unobtainium Unobtainium The Elements of Power: Gadgets, Guns, and the Struggle for a Sustainable Future in the Rare Metal Age By David S Abraham Yale University Press 319pp £20 order from our bookshop   Books on resource wars are ten a penny and usually focus on oil or water conflicts. David Abraham’s attractively written book is unusual because it deals with commodities lurking in plain sight within cars, planes, fibre-optic cables, structural steels, LED lights, cameras, computers, televisions, MRI scanners, military night-vision goggles, missile guidance systems and smart phones – the rare metals. Take niobium. When Gustave Eiffel built the tower that bears his name, he needed seven thousand tons of steel. With the addition of a pinch of niobium to each ton of steel, a modern replica could be built using five thousand tons fewer. A Boeing 747 has six million components per plane, in...
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