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#!/bin/bash
# ./benchcmp.sh branch1 branch2 [count]
function curbranch {
git rev-parse --abbrev-ref HEAD 2>/dev/null
}
function curcommit {
git log -n 1 --format=%H | cut -c 1-9
}
count=$3
if [[ -z "$count" ]]; then
count=5
fi
if [[ ! "$count" != ^[1-9][0-9]*$ ]]; then
echo "third argument must be a positive integer"
exit 1
fi
set -e
tmpdir=$(mktemp -d 2>/dev/null || mktemp -d -t 'jwxbench')
origbranch=$(git rev-parse --abbrev-ref HEAD)
outputfiles=()
commits=()
echo "# Going to run ${count} iterations of benchmarks against $1 and $2 branches"
for branch in $1 $2
do
cbranch=$(curbranch)
if [[ "$branch" != "$cbranch" ]]; then
git switch $branch
fi
echo "# Running benchmark against $branch..."
output="${tmpdir}/${branch/\//-}.bench.txt"
outputfiles+=($output)
commits+=($(curcommit))
pushd bench
set -x
go test -count=$count -bench . -benchmem | tee "$output"
set +x
popd
done
cbranch=$(curbranch)
if [[ "$cbranch" != "$origbranch" ]]; then
git switch "$origbranch"
fi
echo "Benchmark comparison for:"
echo " $1 (${commits[0]})"
echo " $2 (${commits[1]})"
echo ""
benchstat "${outputfiles[0]}" "${outputfiles[1]}"
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