Russell Brown russelldb

Try it live: http://engelsanchez.net/riak-vis/put_path_trace/

Source code: https://github.com/engelsanchez/riak_perf_analysis/tree/master/put_path_trace

Erlang Tracing links:

Scott's tracing talk: video | slides
My tracing guide: https://github.com/basho/internal_wiki/wiki/Erlang-Tracing-Guide
erlang:trace BIF: http://www.erlang.org/doc/man/erlang.html#trace-3
Match spec language: http://www.erlang.org/doc/apps/erts/match_spec.html
dbg tracing helper module: http://www.erlang.org/doc/man/dbg.html

compile ffmpeg for arm https://github.com/fiorix/ffmpeg-arm
create youtube 'live event'. get rtmp url + session id
run this:

raspivid -o - -t 0 -vf -hf -fps 30 -b 6000000 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/<SESSION>

you can tweak -b and -fps to your liking. the settings above work well for 1080p. by not specifying width or height we get the full 1920x1080 resolution from the raspi camera

Covering more with unit tests

Unit tests are quick to run, quick to write in bulk, target a small area of code, are not prone to timing issues and other intermittent failures and have excellent reporting tools.

However, actual usage is often prevented by side effects which require resources such as processes, ports and ets tables to exist or will crash the test.

Separating code into pure and impure functions can help and is typically beneficial. It can also harm readability, and even then not enable full coverage using unit testing. For example:

receive_message(Msg) -&gt;

This list has moved to the following page:

http://anonymoushash.vmbrasseur.com/resources/negotiation/

It's joining a number of other lists of resources (management, telecommuting, etc.):

http://anonymoushash.vmbrasseur.com/resources/

Keeping them all together like this makes it much more likely I'll maintain them (as a group they'll have a larger mindshare in my cluttered & busy brain) rather than fire & forget a list which is never updated again.

tl;dr You should watch this.

It's interesting to me that a significant number of talks in this year's Strange Loop conference referenced a 1966 paper by Peter Landin called (somewhat tongue in cheek) "The Next 700 Programming Languages". In this paper, Landin describes a programming language which he says in a footnote might be aptly called "Church without the lambda" - but which in the paper is called "If You See What I Mean" (ISWIM).

Alvaro's talk delved deeply into the question of "What is the semantics or meaning of a program?" Alvaro's thesis is that the meaning of a program is to produce desired outcomes from a computing system but that current languages focus on

	-module(client_eqc).
	-compile(export_all).

	-include_lib("eqc/include/eqc.hrl").
	-include_lib("eqc/include/eqc_component.hrl").

	api_spec() ->
	#api_spec {
	language = erlang,
	modules = [

	%% @doc A VERY EVIL parse_transform that allows two things:
	%%
	%% 1) The use of 'else' instead of 'true' in the final clause of an if
	%% expression.
	%%
	%% 2) Automatic extraction of non-guard expressions into
	%% anonymous variables that can then be used directly in the clause
	%% guards.
	%%
	%% Until Erlang actually implements the 'cond' construct, this is a

	Write a program that does what it’s supposed to do
	Write idiomatic code
	Debug a program that you wrote
	Debug a program someone else wrote
	Debug the interaction between a system you wrote and one you didn’t
	File a good bug report
	Modify a program you didn’t write
	Test a program you wrote
	Test a program you didn’t write
	Learn a new programming language

	;; Use org-babel to load config
	(require 'org)
	(org-babel-load-file (expand-file-name "seancribbs.org" user-emacs-directory))