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Any HYIP is very funny, when you look at it from the side. Less funny when you find yourself involved in it directly. HYIP Go was somewhere on 2014iy year, when the authors of the application having the strength 1000RPM (requests per minute) suddenly decided that they urgently need the concurrency, because that's their 1000RPM to turn into 1000RPS (which is not much, really). the Result of hype was the fact that to Go joined lot of people used to the MVC architecture of the application, be it Spring, Django or Ruby on Rails. This architecture, as the owl on the globe, they began to pull on the Go. So there were cadavers like Beego and Revel. Revel died happily, although he was still trying to pump. But Beego like to talk separately. a significant...

Hello, harrowdene! I bring to your attention translation of the article "How a single PostgreSQL config change improved slow query performance by 50x" author Pavan Patibandla. She's helped me to improve the performance of PostgreSQL. Amplitude our goal is to provide easy to use interactive Analytics products that enable everyone to find the answers to your questions about the product. To ensure that Amplitude should quickly provide these answers. So when one of our clients complained about the time it took to download the drop-down list of event properties in the user interface Amplitude, we have begun a detailed study of the problem. the Tracking delay at different levels, we realized that one specific PostgreSQL query took 20 seconds to complete. For us...

The Formula Bailey — Borwein — Plaff that allows you to extract any specific hexadecimal or binary digit of PI without calculating the previous (the current record was set for the Chudnovsky algorithm, see under the cut) the Compute cluster in Google Compute Engine for 121 days 25 virtual machines calculated the greatest number of digits in the number PI, setting a new world record of 31.4 trillion decimal places. This is the first time to calculate the PI of this magnitude was used public cloud software. Record will be recorded in the name of Emma Haruka Iwao (Emma Haruka Iwao) division of high performance computing in Google. It used Google's infrastructure for Cloud computing. The previous world record was set by Peter TRUB in 2016, he calculated the...

Greetings to all readers of Habra! My name is Igor Rybakov and I'm the technical Director of the Kazakhstan IT companies DAR. Today I will share with you understanding and using the principles of parallel computing in modern information systems. To better understand this, I would like to argue in favor of the study and practical application of the concepts of parallel and distributed computing in the development of modern information systems. Parallel computing or what does the founder of Intel First, a little history. In 1965 Gordon Moore, cofounder of Intel, discovered a pattern: the emergence of new models of chips was observed after about a year of precursors, the number of transistors in them increased, each time by approximately half. It turns out...

On the Internet you can find a lot of articles about how to communicate with users and conduct usability testing. But, as often happens, drew on paper and forgot about the ravines. Not all and not always have the opportunity, time, money ... continue to list other reasons, which conduct research as necessary is not obtained. Does not work, and still need. Well, it is not necessary, but highly desirable to know their audience on the other side of the screen. what to do? Shrug, forget and score? Option so-so, to be honest. In my piggy Bank were two of the demonstrational project, which I made from scratch, researching and testing of a series: do as it will and can be turned out like. have concluded that it is better than nothing at all. Want to share the...

As you know, text editor Google Docs allows multi-user work, so several people can edit one document. Including at the same time. Maybe someone never thought, but this way you can send each other messages in real-time. If several people at the same time write in a single document, the result is something like a chat. In addition, there is regular chat. It's also handy to chat in the comments because they can be quickly removed (to take). it is not Surprising that Google Docs has become popular among American schoolchildren: "as in middle and high school students more and more laptops, teachers often suggest using Google Docs for collaboration exercises and help students to follow the lesson plan. However, pupils also use the text editor to organize...

The Company "Yandex" is planning to introduce a new method to remove from the search results, more links to pirated content reported by "Vedomosti". The company has created and has already launched a specialized program a robot that searches for network pages with content similar to those already in the "pirate registry". To improve efficiency the program uses principles of machine learning. In the past year, the largest Russian media companies, encouraged to fight piracy. So, media houses, online cinema and the producers had signed with Internet companies a Memorandum on the fight against piracy. One of the provisions of the Memorandum points to the need for a court order to remove from search results links to pages with pirated copies of films and TV...

The News is tinged with subjectivity How many times have you thought something like: I wish I had wheels from Toyota, drive, and maneuverability of the hunter, the exterior of the X3, and the size of the Tundra would be the perfect car? And Yandex have thought — and he did. Anyway, first impressions of his social service "Aura" — wow, wow, fly, walk, convenient and easy. But the devil, as you know, in the details. While this is a beta and I hope that I do not shoot for the screenshots. So, Habr — meet Aura lit up. The lions had one more platform to conquer the world :-) Read more →

Reflections on the technological singularity outside, in fact, attempts to advance in the understanding of the processes behind this term are hidden — that is, in fact, thinking about the attitude towards a technological singularity is a kind of real Kobayashi Maru test for the people the beginning of XXI century, the meaning of which is to understand what it means to the idea of the unknowable, the idea of loss of control and the idea of the inevitability of this, in the scale of all mankind. the idea is simple psychotherapeutic practice: find the inside point where the conscious recognition of the rules of the game to catch the balance with the adoption of the subconscious — without stalling in the denial, anger, bargaining and despair. this test, which...

Consider in practice using Windows Active Directory + NPS (2 server for failover) + 802.1 x standard for access control and user authentication – domain computers devices. To see the theory according to the standard in Wikipedia, the link: IEEE 802.1 X as the “laboratory” I have limited resources, working the role of NPS and the domain controller, but I recommend such critical services still divided. the Standard way to synchronize the configurations (policies) Windows NPS I don't know, so we can use the PowerShell script triggered by task scheduler (the author is a former colleague of mine). To authenticate domain computers, and for devices not able to 802.1 x (phones, printers, etc.), you will set up a group policy and created security groups. At the end...

Services research information technology are now free. Sounds unbelievable but true. Overview of the platform (in translation from English — “Review Platforms”), accumulate in their directories the most popular content about software, services, hardware and collect feedback real users of these information technology solutions. Now the CIO in the selection of it products not only interested in experts, but scans the web pages of these independent sources of information. Read more →

"With experience comes standard, scientific approach to calculating the correct size of the stack: take a random number and hope for the best" — Jack Ganssle, "The Art of Designing Embedded Systems" hi, Habr! oddly enough, but the vast majority I've seen "books for beginners" at the STM32 in particular, and microcontrollers do not, as a rule, nothing at all about such a thing as allocating memory, placing the stack and, most importantly, to prevent memory overflow resulting in the one area frays the other and everything falls apart, usually with magical effects. this is Partly due to the simplicity of the training projects carried out at the same time on debugging boards with a relatively fatty microcontrollers, which fly into a shortage of memory, blinking...

Robotic operating system ROS is a pretty powerful platform for creating robotic systems that includes everything you need to develop your projects from the simplest of software components called “nodes”, and data exchange Protocol to simulate the real environment of the robotic platform of the Gazebo. Basically, ROS is used in conjunction with such microcontrollers using the Arduino platform. The Internet is full of all sorts of tutorials about a bunch of ROS and Arduino. At the moment there is no information on the use of robotic operating system ROS in conjunction with a microcontroller STM32. The Internet is full of only questions. Read more →

A Few days ago, Microsoft has decided to open the source code is known to all program — "Calculator" of Windows. This app is included in all distributions of OS from Microsoft since 1985, when the world saw Windows 1.0. Microsoft uses the MIT license for your software. This is the same type of license that is used .Net Core Visual Studio Code, and MS-DOS. According to representatives of the Corporation, now they open up the development process for the open source community. Third-party developers can offer new features and to cooperate with engineers from Microsoft to add these features. Read more →

Neuroprocessor STC "Module" Russian scientific and technical centre "Module" has developed a new neuroprocessor NM6408, and creating a chip cost of 480 million rubles. Now he launched into serial production. "Several thousand processors are already in our warehouse, ready for shipment, we plan to order more as necessary," the company said. 21-core chip designed for 28 nm topology, as reported by Cnews. It was created as a computational accelerator for servers with a peak performance of 512 GFlops. It is designed to handle large streams of data in real time, allowing you, the assurance of developers, to solve a variety of tasks, not only of the neural network. Read more →