#!/bin/sh
# set -x

if [ $# -lt 4 ]; then
  echo "usage: perf_diff_gc iterations options1 options2 [conf-name1] [conf-name2]"
  echo "example: perf_diff_gc 100 \"-bm=default\" \"-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"
BENCHMARK=""
WARMUP="-warmup"

DATE=`date +%m-%d`


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

OLD_RUBY_HEAP_MIN_SLOTS=$RUBY_HEAP_MIN_SLOTS
OLD_RUBY_GC_MALLOC_LIMIT=$RUBY_GC_MALLOC_LIMIT
OLD_RUBY_HEAP_FREE_MIN=$RUBY_HEAP_FREE_MIN

PERF_OPTIONS="$ITER $WARMUP $COMMON $OPT1"

use_patched_gc="no"
for opt in $COMMON $OPT1; do
  case $opt in
  -patched_gc) use_patched_gc="yes";;
  esac
done

if [ "${use_patched_gc}" = "yes" ]; then
  RUBY_HEAP_MIN_SLOTS=$OLD_RUBY_HEAP_MIN_SLOTS
  RUBY_GC_MALLOC_LIMIT=$OLD_RUBY_GC_MALLOC_LIMIT
  RUBY_HEAP_FREE_MIN=$OLD_RUBY_HEAP_FREE_MIN
  export RUBY_HEAP_MIN_SLOTS RUBY_GC_MALLOC_LIMIT RUBY_HEAP_FREE_MIN
else
  unset RUBY_HEAP_MIN_SLOTS RUBY_GC_MALLOC_LIMIT RUBY_HEAP_FREE_MIN
fi

echo "benchmarking GC performance with options $PERF_OPTIONS"
echo

(RUBY_GC_STATS=1 RUBY_GC_DATA_FILE=$FILE1 ruby $BINDIR/run_urls $PERF_OPTIONS >/dev/null) \
 && ruby $BINDIR/perf_times_gc $FILE1
echo;echo

PERF_OPTIONS="$ITER $WARMUP $COMMON $OPT2"

use_patched_gc="no"
for opt in $COMMON $OPT2; do
  case $opt in
  -patched_gc) use_patched_gc="yes";;
  esac
done

if [ "${use_patched_gc}" = "yes" ]; then
  RUBY_HEAP_MIN_SLOTS=$OLD_RUBY_HEAP_MIN_SLOTS
  RUBY_GC_MALLOC_LIMIT=$OLD_RUBY_GC_MALLOC_LIMIT
  RUBY_HEAP_FREE_MIN=$OLD_RUBY_HEAP_FREE_MIN
  export RUBY_HEAP_MIN_SLOTS RUBY_GC_MALLOC_LIMIT RUBY_HEAP_FREE_MIN
else
  unset RUBY_HEAP_MIN_SLOTS RUBY_GC_MALLOC_LIMIT RUBY_HEAP_FREE_MIN
fi

echo "benchmarking GC performance with options $PERF_OPTIONS"
echo

(RUBY_GC_STATS=1 RUBY_GC_DATA_FILE=$FILE2 ruby $BINDIR/run_urls $PERF_OPTIONS >/dev/null) \
 && ruby $BINDIR/perf_times_gc $FILE2
echo;echo

echo "benchmark comparison data"
echo

ruby $BINDIR/perf_comp_gc $FILE1 $FILE2