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#!/usr/bin/env sh
cat <<EOF
This script is for painlessly finding min and max allocations of T12545 based on
playing with -dunique-increment (see #19414) to diagnose if a metric increase is
a false positive.
A ratio of about 4.8% (48 per mille) is expected.
EOF
# https://stackoverflow.com/a/4774063/388010
TOP="$( cd -- "$(dirname "$0")/../../../../" >/dev/null 2>&1 ; pwd -P )"
GHC=${GHC:-$TOP/_validate/stage1/bin/ghc}
echo "Using GHC=$GHC. Feel free to override via env var"
function measure() {
$GHC -fforce-recomp -v0 -dunique-increment=$1 T12545.hs +RTS -t 2>&1 | cut -f1 -d',' | grep -o -P '\d+'
}
min=999999999999
max=-999999999999
while true; do
inc=$((1 + $RANDOM % 1000000))
n=$(measure $inc)
any_change=false
if [ $n -lt $min ]; then
min=$n
any_change=true
echo "New min: $min (on $inc)"
fi
if [ $n -gt $max ]; then
max=$n
any_change=true
echo "New max: $max (on $inc)"
fi
if [ "$any_change" = true ]; then
echo "New ratio: $(($max*1000/$min - 1000)) per mille"
fi
done
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