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Performance monitoring of PostgreSQL queries. Part 1 — Reporting

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Engineer — translated from Latin — means inspired. An engineer can do anything. (c) R.Diesel. Epigraphs. Or the story of why a database administrator should remember their programming past. Preface All names have been changed. Any resemblance is coincidental. This material represents solely the author's personal opinion. Disclaimer of warranties: the planned series of articles will not contain detailed and precise descriptions of the tables used […]

Xiaomi Mi ART TV: 65-inch picture frame TV with a thickness of 13.9 mm

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Xiaomi has introduced the first television in the new ART TV series (or Mural TV): a 65-inch 4K panel made with a Samsung display. The TV is only 13.9 mm thick. Thanks to its flat back, the panel can be pressed flush against the wall, mimicking a painting. In standby mode, the Mi ART TV can display artworks from 45 authors in 22 […]

Random oracle based on digital signature in blockchain

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From Idea to Implementation: Modifying the existing digital signature scheme based on elliptic curves to make it deterministic, and providing on its basis functions for obtaining verifiable pseudorandom numbers within the blockchain. Idea In the autumn of 2018, the first smart contracts were activated on the Waves blockchain, immediately raising the question of the possibility of obtaining trustworthy pseudorandom numbers. Pondering this issue, […]

Everything in-house: the first SSD controller based on the Chinese Godson architecture has been unveiled

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For China, mass production of SSD controllers is as crucial as establishing domestic production of NAND flash memory and DRAM. Limited production of 32-layer 3D NAND and DDR4 chips has already begun in the country. But what is the situation with controllers? According to EXPreview, about ten companies in China are developing SSD controllers. All of them utilize that or […]

Release of OpenBSD 6.5

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The release of the free, cross-platform UNIX-like operating system OpenBSD 6.5 has come to light. The OpenBSD project was founded by Theo de Raadt in 1995 after a conflict with developers of NetBSD, which resulted in Theo being denied access to the NetBSD CVS repository. After that, Theo de Raadt and a group of like-minded individuals created a fork based on the NetBSD source code tree […]

Steal: Who is stealing CPU time from virtual machines?

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Hello! I want to explain in simple terms how steal arises within virtual machines and some of the not-so-obvious artifacts we discovered during our investigation, which I delved into as the tech director of Mail.ru Cloud Solutions. The platform operates on KVM. CPU steal time is the time when a virtual machine does not receive CPU resources […]

«Medium» — the first decentralized internet provider in Russia

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It's hard to imagine that any of the local residents are unfamiliar with the rather controversial and already quite notorious bill regarding the 'sovereign Runet.' In this article, I would like to share with Habra readers information about an already functioning decentralized provider in Russia that allows access to resources on the I2P network, and also invite interested citizens to join the project and raise […]

The NetBeans development environment has achieved Apache top-level project status

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The Apache Software Foundation has announced the awarding of primary project status to the integrated development environment NetBeans. In the fall of 2016, Oracle decided to transfer the project under the auspices of the Apache Foundation, after which it handed over 4 million lines of code and rights to all related source texts for NetBeans, as well as the 'NetBeans' trademark, the domain 'netbeans.org,' and some elements […]

How We Built Monitoring with Prometheus, Clickhouse, and ELK

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My name is Anton Baderin. I work at the Center for High Technologies and specialize in system administration. A month ago, our corporate conference concluded, where we shared accumulated experiences with the IT community in our city. I talked about monitoring web applications. The material was intended for junior or middle levels, who had not built this process from scratch. The cornerstone of any monitoring system […]

Flexiant Cloud Orchestrator: what is it used for

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To provide IaaS (Virtual Data Center) services, we at Rusonyx use the commercial orchestrator Flexiant Cloud Orchestrator (FCO). This solution features a rather unique architecture that distinguishes it from the well-known OpenStack and CloudStack. For compute node hypervisors, KVM, VMware, Xen, Virtuozzo 6/7, and containers from Virtuozzo are supported. The supported storage options include local, NFS, […]

Introduction to Elasticsearch step by step

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Hello! Today we will discuss the full-text search engine Elasticsearch (hereafter ES), which is used by the Docsvision 5.5 platform. 1. Installation The latest version can be downloaded at the following link: www.elastic.co/downloads/elasticsearch The installer screenshot is below: 2. Checking functionality After completing the installation, navigate to http://localhost:9200/ The ES status page should be displayed, as shown below: If the page does not open, ensure that the Elasticsearch service […]

WebRTC and video surveillance: how we eliminated video latency with cameras

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From the very first days of working on the cloud video surveillance system, we encountered a problem that could have spelled disaster for Ivideon – it was our Everest, climbing which took immense effort, but now we have finally planted our ice pick at the summit of this cross-platform riddle. The system for transmitting sound and video over the Internet should not depend on hardware, Web clients […]

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