Ben Albrecht ben-albrecht

/*
  Holder for test result information.
  Test results are automatically managed by the TestRunner, and do not 
  need to be explicitly manipulated by writers of tests.  
  Each instance holds the total number of tests run, and collections of 
  failures and errors that occurred among those test runs. The collections
  contain tuples of (testcase, exceptioninfo), where exceptioninfo is the
  formatted traceback of the error that occurred.
*/

High-Performance Matrix Multiplication

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).

Intro

Matrix multiplication is a mathematical operation that defines the product of

Chapel Lightning Demo

2017 Workshop on Open Source Supercomputing

0 - Building and Installing Chapel
- OS X (Homebrew)
- Building from source
1 - Basics & Task Parallelism
2 - Locality & Task Parallelism
3 - Data Parallelism

GSoC 2017: Improve LLVM Backend

The Chapel compiler can compile both to C or LLVM. The main idea behind this project was to improve code generated by LLVM backend of compiler. Part of the project was to do as many tasks as possible in this github issue. Initially, this list contained only couple of introductory tasks (the first few), but it grew as the project progressed.

The biggest accomplishment of this summer was improving vectorization in LLVM IR. Here is a

GSoC 2016: Incremental Compilation in Chapel

Organization: Chapel

Project: Incremental Compilation

Student: Kushal Singh

Mentors: Lydia Duncan, Ben Harshbarger

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime and ffmpeg.

Forked from https://gist.github.com/dergachev/4627207. Updated to use a palette to improve quality and skip gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

	import os
	from pathlib import Path
	import logging
	import argparse
	from concurrent.futures import ThreadPoolExecutor, as_completed
	import pathspec
	from collections import defaultdict

	# Configure logging
	logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')

	# FastHTML docs

	## Map

	~~~
	├── mds/
	├── CNAME
	├── codebase.md
	├── index.html
	├── index.html.md

	"
	" Add this to your vimrc to get a warning before opening files that will take a while to load in vim.
	" This includes: binary (non-ascii, non-utf) files and certain filetypes (csv, tsv)
	"

	augroup bigfiles
	" Clear the bigfiles group in case defined elsewhere
	autocmd!
	" Set autocommand to run before reading buffer
	autocmd BufReadCmd * silent call PromptFileEdit()

	bind -T root F12 \
	set prefix None \;\
	set key-table off \;\
	set status-style "fg=$color_status_text,bg=$color_window_off_status_bg" \;\
	set window-status-current-format "#[fg=$color_window_off_status_bg,bg=$color_window_off_status_current_bg]$separator_powerline_right#[default] #I:#W# #[fg=$color_window_off_status_current_bg,bg=$color_window_off_status_bg]$separator_powerline_right#[default]" \;\
	set window-status-current-style "fg=$color_dark,bold,bg=$color_window_off_status_current_bg" \;\
	if -F '#{pane_in_mode}' 'send-keys -X cancel' \;\
	refresh-client -S \;\

	bind -T off F12 \