mirror_test.sh

#!/bin/bash

# mirror_test.sh
# benchmarks closest ubuntu mirrors and outputs them in speed order 
# bash -c "$(curl -fsSL https://gist.githubusercontent.com/lox/9152137/raw/mirror_test.sh)"

MIRRORS=$(curl -s http://mirrors.ubuntu.com/mirrors.txt)
TESTFILE="dists/$(lsb_release -c -s)/main/binary-amd64/Packages.bz2"
TIMEOUT=3
SAMPLES=3

usage() {
cat << EOF
usage: $0 options

Tests out close by mirrors and prints them in speed order

OPTIONS:
   -h      Show this message
   -s <n>  Number of samples to take (default $SAMPLES)
EOF
}

# tests the provided mirror, outputs times
function test_mirror() {
  for s in $(seq 1 $SAMPLES) ; do
    time=$(curl --max-time $TIMEOUT --silent --output /dev/null --write-out %{time_total} ${1}${TESTFILE})
    if [ "$TIME" == "0.000" ] ; then exit 1; fi
    echo $time
  done
}

# tests all the mirrors, outputs mirror and average time
function test_all_mirrors() {
  for MIRROR in $MIRRORS ; do
    mean=$(test_mirror $MIRROR | awk -vx=0 '{
      delta = $1 - avg; 
      avg += delta / NR; 
      mean2 += delta * ($1 - avg); 
      } END { printf ("%.5f\n",avg+sqrt(mean2 / NR)); }')
    if [ "$mean" != "-nan" ] ; then
      printf '%-60s %.5f\n' $MIRROR $mean
    else
      printf '%-60s failed, ignoring\n' $MIRROR 1>&2
    fi
  done;
}

# parse arguments
while getopts "hs:" OPTION
do
  case $OPTION in
    s) SAMPLES=$OPTARG ;;
    h) usage; exit 1 ;;
    ?) usage; exit ;;
  esac
done

# print mirrors in order of time
test_all_mirrors | sort -n -k 2 | grep http