eiri

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;

eiri

[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

eiri

# Build and slim Erlang
# Author: Matthias Lang <[email protected]>
# 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)

eiri

#!/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"),

eiri

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}.

eiri

#!/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))]).

eiri

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.

eiri

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

eiri

{ok, F} = escript:extract("cfcheck", []).
file:write_file("c.zip", proplists:get_value(archive, F)).

eiri

    var items = _.chain(this.state.docs)
      .slice(0, 10)
      .map(function(doc, idx) {
        return [
          React.createElement(ListDivider, {
            key: 'div' + idx,
            inset: false
          }),
          React.createElement(ListItem, {
            key: 'item' + idx,