eldritchideen

"**************************************************************************
 * Allowable characters:                                                  *
 *    - a-z                                                               *
 *    - A-Z                                                               *
 *    - 0-9                                                               *
 *    - .+/\*~<>@%|&?                                                     *
 *    - blank, tab, cr, ff, lf                                            *
 *                                                                        *
 * Variables:                                                             *
 *    - variables must be declared before use                             *

eldritchideen

package main

import (
	"html/template"
	"log"
	"net/http"
	"net/url"
	"time"
)

eldritchideen

package main

import (
	"fmt"
	"math"
	"math/rand"

	"github.com/gonum/matrix/mat64"
)

eldritchideen

package main

import (
	"fmt"
	"github.com/gorilla/mux"
	"github.com/gorilla/securecookie"
	"net/http"
)

// cookie handling

eldritchideen

def take_while(fn, coll):
    """Yield values from coll until fn is False"""
    for e in coll:
        if fn(e):
            yield e
        else:
            return

def partition(n, coll, step=None):
    return take_while(lambda e: len(e) == n,

eldritchideen

HTTP Server Micro-Benchmarks

Here are the results of testing returning a small text string from a HTTP request implemented in various languages all, tested under the same conditions. The command used to test the server implementations was:

wrk -c 40 -d 60s -t 2 --latency http://localhost:3000

Python3

This test used the new async support in python 3.5.

eldritchideen

Golang Job Queue

A running example of the code from:

• http://marcio.io/2015/07/handling-1-million-requests-per-minute-with-golang
• http://nesv.github.io/golang/2014/02/25/worker-queues-in-go.html

Step 1

Small refactorings made to original code:

eldritchideen

const request = require('request'),
      cheerio = require('cheerio'),
           fs = require('fs');

request('http://www.marketindex.com.au/all-ordinaries', function (error, response, body) {
    if (!error && response.statusCode === 200) {
        let stocks = [];
        let $ = cheerio.load(body);
        $('#asx_sp_table > tbody > tr > td:nth-child(2)').each((i,elem) => {
          stocks[i] = elem.children[0].data;

eldritchideen

If you are seeing Mongo soft rlimits warnings in your logs, or a WARNING: soft rlimits too low. Number of files is 256, should be at least 1000 when you login to mongo shell via mongo from the commandline, or any mysterious/unexplained mongo connection errors... follow this how-to exactly and it will resolve the issue for you.

(Source of this how to found at basho/basho_docs#1402)

First file: sudo vi /Library/LaunchDaemons/limit.maxfiles.plist

...containing:

eldritchideen

function Vector(x,y) {
  this.x = x
  this.y = y
}
Vector.prototype.plus = function(other) {
  return new Vector(this.x + other.x, this.y + other.y)
};
Vector.prototype.minus = function(other) {
  return new Vector(this.x - other.x, this.y - other.y)
};