Eric Avdey eiri

Drop it in ~/bin and use as following

vagrant@karas:~/git$ echo voluptatem%:doloribus | urlencode 
voluptatem%25%3Adoloribus

Erlang/OTP 17 [erts-6.4.1.2] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]

Eshell V6.4.1.2  (abort with ^G)
1> c(zombie_timer).
{ok,zombie_timer}
2> zombie_timer:main().
-. start timer {1458135323982793,#Ref<0.0.0.79>} from <0.40.0>
-. loop is <0.40.0>
1. &lt;0.40.0&gt;

Demonstrate Erlang's 'busy wait' effect on CPU utilization

How?

Just make Erlang to do some light-load task in a bunch of relatively short leaving processes. Calculating PI to 80th digit in batches per 10 procs with short, 8 ms, sleep in-between, to give schedulers a breath space, will do.

Running

Run erl with 8 schedulers and no busy waiting on schedulers at all.

Test CouchDB docs 'links'

Pre-req

Python with virtualenv, curl and jq in $PATH, running CouchDB available on http://localhost:5984

Prepare

git clone https://gist.github.com/f05328e7e24a1064c3ce.git test-linked

	$ curl $db/neato -XPUT
	{“ok”:true}

	$ curl $db/neato -XPOST -H’Content-Type: application/json’ -d’{“key”: 1}’
	{“ok”:true,”id”:”b24a8da105719f433651feabff001d5d”,”rev”:”1-c77eb5d5af83163c996ea42b61a9f0d8”}

	$ curl $db/neato/b24a8da105719f433651feabff001d5d -G -s \| jq .
	{
	“_id”: “b24a8da105719f433651feabff001d5d”,
	“_rev”: “1-c77eb5d5af83163c996ea42b61a9f0d8”,

	[core]
	editor = vim
	pager = less
	whitespace = fix,-indent-with-non-tab,trailing-space,cr-at-eolpager
	[color]
	status = auto
	branch = auto
	diff = auto
	interactive = auto
	pager = true

	# Build and slim Erlang
	# Author: Matthias Lang <matthias@corelatus.se>
	# Reference: http://erlang.org/pipermail/erlang-questions/2016-February/087935.html

	# Change the line below if you want to use a different version of Erlang
	# (Keep in mind that patches may not apply cleanly)
	erlang_version=otp_src_R14B03

	erlang_source_file:=$(PACKAGE_SOURCES)/$(erlang_version)/$(erlang_version).tar.gz
	erlang_root=$(GTH_ERLANG_ROOT)/$(erlang_version)

	#!/usr/bin/env escript
	%% -- erlang --

	%% * slurp in terms using inlined version of kernels file:consult/1
	%% * convert to abstract syntax tree
	%% * annotate all tuples
	%% * pretty print using a hook to prefix the annotated nodes with newline

	main([]) ->
	io:format("%% --erlang--~n"),


	make_random_ref_key() ->
	<<X:264/big-unsigned-integer>> = term_to_binary(make_ref()),
	[Key] = io_lib:format("~66.16.0b", [X]),
	{ok, Key}.

	make_random_md5_key() ->
	<<X:128/big-unsigned-integer>> = crypto:hash(md5, term_to_binary(make_ref())),
	[Key] = io_lib:format("~32.16.0b", [X]),
	{ok, Key}.

	#!/usr/bin/env escript
	% -- mode: erlang --

	main([BeamFile]) ->
	{ok,{_,[{abstract_code,{_,AC}}]}} = beam_lib:chunks(BeamFile,[abstract_code]),
	io:fwrite("~s~n", [erl_prettypr:format(erl_syntax:form_list(AC))]).