A simple benchmark runner with a date parser

benchmark.sh

#!/bin/bash

if [ -z "$1" ] || [ -z "$2" ] || [ -z "$3" ] ; then
  echo 'Usage : $0 [PRE-COMMAND] [COMMAND] [RESULT FILE]'
  exit 1
fi

if [ ! -f $3 ] ; then
  echo "Creating result file : $3"
  touch $3
fi

PRECOMMAND=$1
COMMAND=$2
RES_FILE=$3

for i in {0..20}
do
  echo "Preparing benchmark ..."
  $PRECOMMAND

  echo "Running benchmark ($i) ..."
  START=$(date +%s%N);
  $COMMAND
  END=$(date +%s%N);

  echo "Registering benchmark ..."
  echo $((END-START)) | awk -f date-parser.awk >> $RES_FILE
done

date-parser.awk

# Usage eg. :
# START=$(date +%s%N);
# END=$(date +%s%N);
# echo $((END-START)) | awk -f date-parser.awk
{
  printf("Raw : %d nanoseconds\n", ($1 / 1000))

  nanoseconds=$1 % 1000
  microseconds=($1 / 1000) % 1000
  milliseconds=($1 / (1000 * 1000)) % 1000
  seconds=($1 / (1000 * 1000 * 1000)) % 60
  minutes=($1 / (60 * 1000 * 1000 * 1000)) % 60
  hours=($1 / (60 * 60 * 1000 * 1000 * 1000)) % 24
  days=($1 / (24 * 60 * 60 * 1000 * 1000 * 1000)) % 7
  weeks=($1 / (7 * 24 * 60 * 60 * 1000 * 1000 * 1000))

  printf("Parsed : %d weeks %01d days %02d:%02d:%02d %03d.%03d.%03d\n", weeks, days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds)
}