wankdanker

#!/bin/bash

if [ "$1" != "" ]; then


echo "
----------------------------------------------------------------------------
http://www.kernel.org/doc/Documentation/vm/ksm.txt :

The effectiveness of KSM and MADV_MERGEABLE is shown in /sys/kernel/mm/ksm/:

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self: 0x7f16b4000ba0  hdbc: 0x16cff40   stmt: (nil)
self: 0x16a9050  hdbc: 0x16b5d20   stmt: 0x2f00c208053e0f2f
self: 0x16a94f0  hdbc: 0x7f16b40011d0   stmt: 0x3f077ba918000000
self: 0x7f16ac000d00  hdbc: 0x178c770   stmt: (nil)
self: 0x7f16ac000ba0  hdbc: 0x7f16b4047f90   stmt: (nil)
self: 0x16a76b0  hdbc: 0x16d13c0   stmt: 0x6c6975622f636264
self: 0x7f16ac000e60  hdbc: 0x17f31c0   stmt: (nil)
self: 0x7f16ac001120  hdbc: 0x16e02d0   stmt: (nil)
self: 0x7f16ac000fc0  hdbc: 0x7f16ac0762e0   stmt: (nil)
self: 0x7f16ac001280  hdbc: 0x182f400   stmt: (nil)

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var dgram = require('dgram');
var socket = dgram.createSocket('udp4');

var testMessage = "[hello world] pid: " + process.pid;
var broadcastAddress = '255.255.255.255';
var broadcastPort = 5555;

socket.setBroadcast(true);
socket.bind(broadcastPort, '0.0.0.0');

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/*
 * Copyright (c) 2011, Ben Noordhuis <[email protected]>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

wankdanker

From 8ebf3363017dc223da153e69b372749ace222244 Mon Sep 17 00:00:00 2001
From: Dan VerWeire <[email protected]>
Date: Thu, 27 Oct 2011 10:48:10 -0400
Subject: [PATCH 1/2] Add support for uv_udp_set_broadcast

---
 deps/uv/include/uv.h   |   12 ++++++++++++
 deps/uv/src/unix/udp.c |   16 ++++++++++++++++
 2 files changed, 28 insertions(+), 0 deletions(-)

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####Linux inspection09 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 22:02:19 UTC 2010 i686 GNU/Linux

[23:28|% 100|+ 623|-   9]: Done

Notes: Head @ 5213c390, bare metal

---

DEST_OS: linux

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user@inspection09:/tmp$ uname -a
Linux inspection09 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 22:02:19 UTC 2010 i686 GNU/Linux


user@inspection09:/tmp$ netstat -plun
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
udp        0      0 0.0.0.0:12345           0.0.0.0:*                           7853/udp-bind-twice
udp        0      0 0.0.0.0:12345           0.0.0.0:*                           7776/udp-bind-twice

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var http = require('http'),
	fs = require('fs'),
	cwd = process.cwd();

http.createServer()
	.on('request', function (request, response) {
		var url = unescape(request.url);
		var path = cwd + url;
		
		console.log(request.socket.remoteAddress, path);

wankdanker

=== debug test-c-ares ===
Path: simple/test-c-ares
C:\node\test\simple\test-c-ares.js:46
  if (error) throw error;
                   ^
Error: getaddrinfo ENOENT
    at errnoException (dns.js:31:11)
    at Object.onanswer [as oncomplete] (dns.js:140:16)
Command: C:\node\Debug\node.exe C:\node\test\simple\test-c-ares.js
=== debug test-child-process-double-pipe ===

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http://www-personal.umich.edu/~bdr/et/mcast-windows.html

This page has Windows tools that can send and receive test multicast messages. With this tool, I have been able to run multiple instances of mcreceive.exe on the same machine. The both instances receive all messages sent by mcsend.exe.

https://gist.github.com/1336326

This page has code which can be compiled on Linux (and other Unix?). Multiple instances can be run and they will not argue about listening on the same UDP port.