openssl-bench.sh

#!/bin/bash
#
# @file openssl-bench.sh
#
# Runs an OpenSSL SHA-256 benchmark and prints the time (in seconds)
# to process 1 terabyte.
#
# Usage:
#   openssl-bench.sh [NUM_CPUS]
#
set -euo pipefail

ncpu="${1:-1}"

if [[ "$ncpu" -eq 1 ]]; then
  opts=
else
  opts="-multi $ncpu"
fi

bytes_per_second=$(
  openssl speed -evp sha256 -bytes 16384 -seconds 10 -mr $opts 2>/dev/null \
  | grep '^+F' | tail -1 | awk -F: '{print $NF}'
)

time_per_tb=$(echo "10^12 / $bytes_per_second" | bc -l)

echo "$time_per_tb"