git status pref script

benchmark_git_status_pref.sh

#!/bin/bash

command -v gtime >/dev/null 2>&1 || { echo >&2 "GNU time is required. Install it through 'brew install gnu-time'.  Aborting."; exit 1; }

command -v rs-git-fsmonitor >/dev/null 2>&1 || { echo >&2 "rs-git-fsmonitor is required. Read https://github.com/jgavris/rs-git-fsmonitor#installation for how to install.  Aborting."; exit 1; }

if [[ "${USER}" != "root" ]]; then
    echo "Run this script as root, since we need to call dtruss during the script."
    exit 1
fi

if [[ ! -d "$1" ]]; then
    echo "First argument must point to a git repo folder to benchmark on"
    exit 1
fi

pushd $1

function timing_dtruss() {
    echo "dtruss $1"

    git clean -fd && git reset --hard HEAD
    echo "No changes timing"
    dtruss git status 2>&1 | grep stat64 | wc -l
    dtruss git status 2>&1 | grep stat64 | wc -l
    touch just_one_empty_file
    echo "One file timing"
    dtruss git status 2>&1 | grep stat64 | wc -l
    dtruss git status 2>&1 | grep stat64 | wc -l
    for i in `seq 1 50`;
    do
            echo "data $i" > temp_file_$i
    done 
    echo "Many files timing"
    dtruss git status 2>&1 | grep stat64 | wc -l
    dtruss git status 2>&1 | grep stat64 | wc -l
    echo "Staged many files"
    dtruss git add . 2>&1 | grep stat64 | wc -l
    echo "Staged many timing"
    dtruss git status 2>&1 | grep stat64 | wc -l
    dtruss git status 2>&1 | grep stat64 | wc -l
}

function timing_gtime() {
    echo "gtime $1"

    git clean -fd && git reset --hard HEAD
    echo "No changes timing"
    gtime --format="%E" git status > /dev/null
    gtime --format="%E" git status > /dev/null
    touch just_one_empty_file
    echo "One file timing"
    gtime --format="%E" git status > /dev/null
    gtime --format="%E" git status > /dev/null
    for i in `seq 1 50`;
    do
            echo "data $i" > temp_file_$i
    done 
    echo "Many files timing"
    gtime --format="%E" git status > /dev/null
    gtime --format="%E" git status > /dev/null
    echo "Staged many files"
    gtime --format="%E" git add .
    echo "Staged many timing"
    gtime --format="%E" git status > /dev/null
    gtime --format="%E" git status > /dev/null
}

git config --unset core.fsmonitor
timing_dtruss "No fs-notifier" 
timing_gtime "No fs-notifier" 

git config core.fsmonitor rs-git-fsmonitor
timing_dtruss "rs-git-notifier"
timing_gtime "rs-git-notifier"

popd