bwtest.sh

#!/usr/bin/env bash
# simple network I/O bandwidth test with ssh and pv
# Author: Jaeho Shin <[email protected]>
# Created: circa 2013

host=${1:?ssh-able host name}; shift
maxbytes=${1:-$((2 ** 29))}; shift
bs=${1:-$((2 ** 16))}; shift
# rest are ssh options
set -- ssh -S none -o Compression=no -o ControlMaster=no "$@" $host

# disable pv unless stderr is a terminal and not inside Jupyter Notebook
[[ -t 2 && -z "${JPY_PARENT_PID:-}" ]] || pv() { cat; }

normalizeSize() {
    {
        echo "k=2^10;m=2^20;g=2^30;t=2^40;"
        tr A-Z a-z | sed 's/[kmgt]/* &/g'
    } <<<"$1" | bc
}
bs=$(normalizeSize "$bs")
maxbytes=$(normalizeSize "$maxbytes")

echo "## Bandwidth in-bound from $host"; {
    "$@" \
    dd if=/dev/zero bs=$bs count=$(($maxbytes / $bs)) |
    pv --average-rate --bytes --progress --timer --size $maxbytes --buffer-size $bs |
    dd of=/dev/null
}
echo

echo "## Bandwidth out-bound to $host"; {
    dd if=/dev/zero bs=$bs count=$(($maxbytes / $bs)) |
    pv --average-rate --bytes --progress --timer --size $maxbytes --buffer-size $bs |
    "$@" \
    dd of=/dev/null
}
echo