#!/bin/sh
# set -x

if [ $# -lt 4 ]; then
  echo "usage: perf_diff iterations common-options options1 options4 [conf-name1] [conf-name2]"
  echo "example: perf_diff 100 \"-bm=all\"  \"-log\" \"-nocache\" c1 c2"
  exit 1
fi

BINDIR=`dirname $0`
test -z "$RAILS_PERF_DATA" && RAILS_PERF_DATA=$HOME

ITER="$1"
COMMON="$2"
OPT1="$3"
OPT2="$4"
DATE=`date +%m-%d`
BENCHMARK=""
for opt in $COMMON; do
  case $opt in
  -bm=*) BENCHMARK=${opt#-bm=};;
  esac
done

if [ $# -gt 4 ]; then
  FILE1="$RAILS_PERF_DATA/${DATE}.${BENCHMARK}.$5.txt"
else
  FILE1="$RAILS_PERF_DATA/perf_run1.${BENCHMARK}.txt"
fi
if [ $# -gt 5 ]; then
  FILE2="$RAILS_PERF_DATA/${DATE}.${BENCHMARK}.$6.txt"
else
  FILE2="$RAILS_PERF_DATA/perf_run2.${BENCHMARK}.txt"
fi

unset RUBY_GC_STATS

PERF_OPTIONS="$ITER $COMMON $OPT1"
RAILS_BENCHMARK_FILE=$FILE1 $BINDIR/perf_loop $PERF_OPTIONS || exit 1
ruby $BINDIR/perf_times $FILE1
echo;echo

PERF_OPTIONS="$ITER $COMMON $OPT2"
RAILS_BENCHMARK_FILE=$FILE2 $BINDIR/perf_loop $PERF_OPTIONS || exit 1
ruby $BINDIR/perf_times $FILE2
echo;echo

ruby $BINDIR/perf_comp -narrow -skip_urls $FILE1 $FILE2