z5ottu

Hydrate ETS from DETS using an init GenServer

Mix.install([
  {:kino, "~> 0.6.2"},
  {:telemetry, "~> 1.2.1"}
])

This is a free sample from the Elixir Patterns book

z5ottu

From http://www.darkcoding.net/software/memcached-list-all-keys/

Telnet into memcached

telnet 127.0.0.1 11211

List items

stats items

STAT items:3:number 1

z5ottu

Script

set your locale:

add these lines to /etc/environment

LANG=en_US.utf-8
LC_ALL=en_US.utf-8

z5ottu

<?xml version="1.0"?>
<!DOCTYPE tsung SYSTEM "/usr/local/share/tsung/tsung-1.0.dtd">
<tsung loglevel="error" version="1.0">
  <!-- t1 and t2 host record should be in /etc/hosts file (on t1,t2 machnines too) -->
	<clients>
		<client host="t1" weight="1" cpu="4" maxusers="51000">
		</client>
		<client host="t2" weight="1" cpu="4" maxusers="51000">
		</client>
	</clients>

z5ottu

include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>
#include "BLE2902.h"
#include "BLEHIDDevice.h"
#include "HIDTypes.h"
#include "HIDKeyboardTypes.h"
#include <driver/adc.h>

BLEHIDDevice* hid;

z5ottu

defmodule Utils.Cowboy do
  use Bitwise

  #
  # ipv4 cowboy string example: "0.0.0.0.0.65535.20060.31747"
  # ipv6 cowboy string example: "10754.43916.45826.36224.35230.44219.15941.63302"

  def erlangCowboyIpv6StringToString(string) do
      if String.starts_with?(string, "0.0.0.0.0.65535") do
          String.split(string,".") |> Enum.take(-2) |> Enum.map(fn(x)-> String.to_integer x end) |> Enum.map(fn(x)-> [x >>> 8,x &&& 255] end) |> List.flatten |> Enum.join(".")

z5ottu

Top 10 DTrace scripts for Mac OS X
Since version 10.5 “Leopard”, Mac OS X has had DTrace, a tool used for performance analysis and troubleshooting. It provides data for Apple’s Instruments tool, as well as a collection of command line tools that are implemented as DTrace scripts. I’m familiar with the latter as I wrote the originals for the DTraceToolkit, which Apple then customized and enhanced for Mac OS X where they are shipped by default (great!). I use them regularly to answer this question:

why is my MacBook slow?

I work in an office where everyone has MacBook Pros, and “why is my MacBook slow?” is a common question. Applications can become slow or unresponsive while waiting for CPU work, memory requests or disk I/O to complete.

For people who try to ignore the slowdown, the question can become:

why is my MacBook fan so loud?

z5ottu

%% -------------------------------------------------------------------
%%
%% riak_mapreduce_map_for_groupby:
%%      Map phase for reduce_plist_sum.
%%      Together is like sql "count" - "group by" functionality)
%%
%% Copyright (c)2018, Szloboda Zsolt, [email protected] All Rights Reserved.
%%
%% This file is provided to you under the Apache License,
%% Version 2.0 (the "License"); you may not use this file

z5ottu

-module(riak_postcommit_hook_example).
-export([postcommitcounter/1, postcommitmapcounter/1]).

%% Refreshing counters from commithook is very expensive!
%%
%% requirements: bucket-type: maps(Type::map), bucket-type: counters(Type::counters)
%%
%% riak-admin bucket-type create maps '{"props":{"datatype":"map"}}'
%% riak-admin bucket-type activate maps
%% riak-admin bucket-type create counters '{"props":{"datatype":"counter"}}'

z5ottu

% Update Counter
increment
decrement
{increment, 4}
{decrement, 9}
% Update Set
{add, <<"Value">>}
{add_all, [<<"Value">>]}
{remove, <<"Value">>}
{remove_all, <<"Value">>}