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
Author: Chris Lattner
| #Reference | |
| #https://devnotcorp.wordpress.com/2012/08/21/usage-examples-of-rubys-openssl-lib/ | |
| #!/usr/bin/ruby | |
| require 'openssl' | |
| require 'date' | |
| require 'time' | |
| # Download latest archlinux bootstrap package, see https://www.archlinux.org/download/ | |
| wget 'ftp://ftp.nluug.nl/pub/os/Linux/distr/archlinux/iso/latest/archlinux-bootstrap-*-x86_64.tar.gz' | |
| # Make sure you'll have enough entropy for pacman-key later. | |
| apt-get install haveged | |
| # Install the arch bootstrap image in a tmpfs. | |
| mount -t tmpfs none /mnt | |
| cd /mnt | |
| tar xvf ~/archlinux-bootstrap-*-x86_64.tar.gz --strip-components=1 |
| #include <stdlib.h> | |
| #include <stdio.h> | |
| #include <unistd.h> | |
| #include <signal.h> | |
| #include <pthread.h> | |
| #include <sys/signalfd.h> | |
| #include <sys/time.h> | |
| #include <sys/types.h> | |
| #define handle_error(msg) \ |
| # Copyright © 2020 Nicky Peeters | |
| # Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: | |
| # The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. | |
| # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE |
| def defer(&block) | |
| def block.each ; yield call ; end | |
| block | |
| end | |
| app = | |
| lambda do |env| | |
| status = 200 | |
| headers = { 'Last-Modified' => exec_sql('SELECT MAX(updated_at) FROM foos').httpdate } | |
