Benchmark script

benchmark.sh

#!/usr/bin/env bash

set -euo pipefail

REPEATS=100
OUTPUT_FILE='results.csv'

run_tests() {
  echo "Benchmarking  ${COMMAND[@]}"

  [ -f "${OUTPUT_FILE}" ] || echo "command,exit status of command,elapsed real time (wall clock) in seconds,user time (seconds),system (kernel) time in seconds" > "${OUTPUT_FILE}"

  escaped_command='"'
  for i in "${!COMMAND[@]}"; do
    ((i != 0)) && escaped_command="$escaped_command "
    escaped_command="$escaped_command${COMMAND[i]//\"/\"\"}"
  done
  escaped_command="$escaped_command\""

  for ((i = 1; i <= REPEATS; i++)); do
    printf '\x1b[1000D'
    printf '%0.s ' {1..1000}
    printf '\x1b[1000D'
    printf 'running test %i out of %i' "${i}" "${REPEATS}"

    #/usr/bin/time -f "%E,%U,%S" -o ${OUTPUT_FILE} -a ${COMMAND[*]} > /dev/null 2>&1
    gtime -f "${escaped_command},%x,%e,%U,%S" -o ${OUTPUT_FILE} -a "${COMMAND[@]}" >/dev/null 2>&1

    # Clear the HDD cache (I hope?)
    #sync && echo 3 > /proc/sys/vm/drop_caches
  done
}

while [[ $# -gt 0 ]]; do
  key="$1"
  case $key in
  -o | --output-file)
    OUTPUT_FILE="$2"
    shift # past argument
    shift # past value
    ;;
  -n | --repeats)
    REPEATS="$2"
    shift # past argument
    shift # past value
    ;;
  *) # unknown option
    break
    ;;
  esac
done

COMMAND=("$@")

run_tests