This is a short post that explains how to write a high-performance matrix multiplication program on modern processors. In this tutorial I will use a single core of the Skylake-client CPU with AVX2, but the principles in this post also apply to other processors with different instruction sets (such as AVX512).
Matrix multiplication is a mathematical operation that defines the product of
| #!/usr/bin/env python | |
| # -*- coding: utf-8 -*- | |
| from __future__ import print_function | |
| from selenium import webdriver | |
| from selenium.webdriver.chrome.options import Options | |
| def create_proxyauth_extension(proxy_host, proxy_port, |
#How I built an audio book reader for my nearly blind grandfather
Last year, when visiting my family back home in Holland, I also stopped by my grand-parents. My grand-father, now 93 years old, had always been a very active man. However, during the presceding couple of months, he'd gone almost completely blind and now spent his days sitting in a chair. Trying to think of something for him to do, I suggested he try out audio books. After finally convincing him -- he said audio books were for sad old people -- that listening to a well performed recording is actually a wonderful experience, I realized the problem of this idea.
####The problem with audio devices and the newly blind. After my first impulse to jump up and go buy him an
(by @andrestaltz)
If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.
Test on single node, MacBook Pro, 16 GB RAM, 1TB SSD, OS X Maverick
ES 1.1.0 with Java 8, G1 GC, 12 GB heap
/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/bin/java -Xms12g -Xmx12g -Djava.awt.headless=true -XX:+UseG1GC -Delasticsearch -Des.foreground=yes -Des.path.home=/Users/es/elasticsearch-1.1.0 -cp :/Users/es/elasticsearch-1.1.0/lib/elasticsearch-1.1.0.jar:/Users/es/elasticsearch-1.1.0/lib/:/Users/es/elasticsearch-1.1.0/lib/sigar/ org.elasticsearch.bootstrap.Elasticsearch
Node
| rabbitmqctl list_connections pid port state user vhost recv_cnt send_cnt send_pend name | awk '{print "rabbitmqctl close_connection \"" $1 "\" \"manually closing idle connection\"" | "/bin/bash" }' |
| curl -X POST "http://localhost:9200/articles/article" -d '{"title" : "One", "tags" : ["foo"]}' | |
| curl -X POST "http://localhost:9200/articles/article" -d '{"title" : "Two", "tags" : ["foo", "bar"]}' | |
| curl -X POST "http://localhost:9200/articles/article" -d '{"title" : "Three", "tags" : ["foo", "bar", "baz"]}' | |
| curl -X POST articles/article/_search | |
| { | |
| "query": { | |
| "function_score": { | |
| "functions": [ | |
| { | |
| "script_score": { |
| { | |
| "title": "Tweets Search", | |
| "rows": [ | |
| { | |
| "title": "Options", | |
| "height": "50px", | |
| "editable": true, | |
| "collapse": false, | |
| "collapsable": true, | |
| "panels": [ |
| Decoding the data in /proc/net/tcp: | |
| Linux 5.x /proc/net/tcp | |
| Linux 6.x /proc/PID/net/tcp | |
| Given a socket: | |
| $ ls -l /proc/24784/fd/11 | |
| lrwx------ 1 jkstill dba 64 Dec 4 16:22 /proc/24784/fd/11 -> socket:[15907701] |
| # Installing CDH4 on a Single Linux Node in Pseudo-distributed Mode in MRv1 | |
| # https://ccp.cloudera.com/display/CDH4DOC/Installing+CDH4+on+a+Single+Linux+Node+in+Pseudo-distributed+Mode#InstallingCDH4onaSingleLinuxNodeinPseudo-distributedMode-InstallingCDH4withMRv1onaSingleLinuxNodeinPseudodistributedmode | |
| # Installing CDH4 with MRv1 on a Single Linux Node in Pseudo-distributed mode | |
| # On Ubuntu Precise | |
| tech@tech-VirtualBox:~$ wget -cv http://archive.cloudera.com/cdh4/one-click-install/precise/amd64/cdh4-repository_1.0_all.deb | |
| tech@tech-VirtualBox:~$ sudo dpkg -i cdh4-repository_1.0_all.deb # Adds /etc/apt/sources.list.d/cloudera-cdh4.list ?? | |
| tech@tech-VirtualBox:~$ dpkg -L cdh4-repository # To view the files on Ubuntu systems | |
| /. | |
| /etc |
