ericychoi

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns                     on recent CPU
L2 cache reference ........................... 7 ns                     14x L1 cache
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns                     20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs 4X memory

ericychoi

var http = require('http');
http.createServer(function(request,response){
    var body = "";
    request.on('data', function(chunk) { body += chunk; });
    request.on('end', function() {
        console.log('POST: ' + body + "\n");
        response.writeHead(200);
        response.end();
    });
}).listen(8000);

ericychoi

use MP3::Tag;
use Encode qw/encode decode/;
use Data::Dumper;
use strict;
use warnings;

# run it in the same directory as mp3s
# sets mp3v2 tags based on file names (assumes filenames are encoded UTF-8, which should be)
#
# filename example: 085. 2PM-01-우리집.mp3

ericychoi

#!/opt/perl/bin/perl

use MIME::Parser;

use strict;
use warnings;

my $parser = MIME::Parser->new();
$parser->output_to_core(1);
$parser->decode_bodies(1);

ericychoi

package base64Benchmark

import (
	"bytes"
	"encoding/base64"
	"flag"
	"io/ioutil"
	"os"
	"regexp"
	"testing"

ericychoi

curl -s -X GET "apidendpointp1mdw1.sendgrid.net:8082/api/swimlane/user/delete.json?userid=1886158"
curl -s -X GET "apidendpointp1mdw1.sendgrid.net:8082/api/swimlane/user/delete.json?userid=1886162"
curl -s -X GET "apidendpointp1mdw1.sendgrid.net:8082/api/swimlane/user/delete.json?userid=1886163"
curl -s -X GET "apidendpointp1mdw1.sendgrid.net:8082/api/swimlane/user/delete.json?userid=1886179"
curl -s -X GET "apidendpointp1mdw1.sendgrid.net:8082/api/swimlane/user/delete.json?userid=1886184"
curl -s -X GET "apidendpointp1mdw1.sendgrid.net:8082/api/swimlane/user/delete.json?userid=1886205"
curl -s -X GET "apidendpointp1mdw1.sendgrid.net:8082/api/swimlane/user/delete.json?userid=1886207"
curl -s -X GET "apidendpointp1mdw1.sendgrid.net:8082/api/swimlane/user/delete.json?userid=1886208"
curl -s -X GET "apidendpointp1mdw1.sendgrid.net:8082/api/swimlane/user/delete.json?userid=1886209"
curl -s -X GET "apidendpointp1mdw1.sendgrid.net:8082/api/swimlane/user/delete.json?userid=1886211"

ericychoi

package main

import "fmt"

const MaxUint = ^uint(0)
const MinUint = 0
const MaxInt = int(MaxUint >> 1)
const MinInt = -MaxInt - 1

func main() {

ericychoi

# use git clone to clone the go repo to the right location in your gopath
function goget() {
  # github.com/foo/bar
  GIT_PATH="$@"
	# git@github.com:foo/bar.git
  GIT_CLONE_PATH=`echo "$GIT_PATH"  | perl -lape 's!(.+?)/!git\@$1:!'`
  mkdir -p "$GOPATH/src/$GIT_PATH" && git clone "$GIT_CLONE_PATH" "$GOPATH/src/$GIT_PATH"
}

ericychoi

var http = require('http');
var jsonResp = {
  "type": "free"
};
var jsonRespPaid = {
  "type": "Paid"
}

var port = process.argv[2];

ericychoi

#!/usr/bin/env perl

use strict;
use warnings;

use Getopt::Long;
use Term::ANSIColor;

# usage:
#