mazurkin

Latency Comparison Numbers
--------------------------
L1 cache reference                            0.5 ns
Branch mispredict                             5   ns
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
Send 1K bytes over 1 Gbps network        10,000   ns    0.01 ms
Read 4K randomly from SSD*              150,000   ns    0.15 ms

mazurkin

#!/ffp/bin/bash

SOURCES=(
  "http://ns0.multikabel.net/100mb.nul"
  "http://servermars.nl/100mb.bin"
  "http://speedtest.tweak.nl/100mb.bin"
  "http://cachefly.cachefly.net/100mb.test"
  "http://mirror.leaseweb.com/speedtest/100mb.bin"
  "http://mirror.de.leaseweb.net/speedtest/100mb.bin"
  "http://178.238.129.83/bigtest.tgz"

mazurkin

System

• atop
• vmstat
• dstat - Combines vmstat, iostat, ifstat, netstat information and more
• speedometer - ASCII graphs

Network

• iftop - Amazing network bandwidth utility to analyse what is really happening on your eth

mazurkin

#!/bin/bash

set -o errexit
set -o nounset
set -o pipefail
set -o monitor
set -o noglob

# https://ffmpeg.org/ffmpeg-devices.html#x11grab
# https://ffmpeg.org/ffmpeg-filters.html#eq

mazurkin

package fizzbuzz;

package com.pulsepoint.datascience.avails;

import java.io.EOFException;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;