#!/bin/bash

#

# This script tests whether the output of a certain ACTS framework example is

# reproducible between single-threaded and multi-threaded runs. For example,

# "./testReproducibility.sh ActsExampleFatrasGeneric" will run the

# ActsExampleFatrasGeneric in single-threaded and multi-threaded mode and

# check whether the output is the same aside from threading-induced event reordering.

#

set -uo pipefail

# Check whether the user did specify the name of the example to be run

ARGC=$#

if [[ $ARGC -lt 2 ]]; then

echo ""

echo " Usage: "$0" <example> <flags> <output1> [<output2> ...]"

echo ""

echo " <example> is the executable name (e.g. ActsExampleFatrasGeneric)"

echo " <flags> is a string containing CLI flags (e.g. \"-n 5\")"

echo " <outputN> is the output name (which is the output file name without the trailing '.root')"

echo ""

exit 42

fi

# Compute the name of the example executable

executable="$1 $2 --output-root true"

echo ${executable}

# Compute the output file names

for ((i = 3; i <= $ARGC; i++)); do

eval output=\$${i}.root

eval outputs[$i]=$output

done

# Drop any remaining output file from previous runs of the example

for output in "${outputs[@]}"; do

rm -f $output ST$output MT$output

done

# Run the example in multi-threaded mode

eval "${executable}"

result=$?

if [[ result -ne 0 ]]; then

echo "Multi-threaded run failed!"

exit $result

fi

# Back up the multi-threaded results

for output in "${outputs[@]}"; do

mv $output MT$output

done

# Run the example in single-threaded mode

eval "${executable} -j 1"

result=$?

if [[ result -ne 0 ]]; then

echo "Single-threaded run failed!"

exit $result

fi

# Back up the single-threaded results

for output in "${outputs[@]}"; do

mv $output ST$output

done

# Check whether the results were identical (up to thread-induced reordering)

for output in "${outputs[@]}"; do

# Compare the active results files

cmd="root -b -q -l -x -e '.x compareRootFiles.C(\"ST$output\", \"MT$output\")'"

eval $cmd

result=$?

# If the results were different, abort and return the output status code

if [[ result -ne 0 ]]; then

exit $result

fi

# Otherwise clean up and continue

rm ST$output MT$output

done