Application startup timing script

startup-time.sh

#!/bin/bash

# This script allow you to test application startup times and compare them,
# including both native packaging (e.g. RPM or DEB) and snaps. You can test
# both cold startups (no data cached in memory) and hot startups (cached).

# If you have any suggestions for improvements, feel free to file a PR
# or email: snap-advocacy at canonical dot com.

# Version 1.0, Oct 2020

#########################
##### Configuration ##### 
#########################

# Application to install (may have different name for pkg and snap)
PTARGET="chromium-browser"
STARGET="chromium"

# Native package manager commands (change to match the target system)
# Example uses apt
PKGMGR="/usr/bin/apt"
PKGMGROPT="install -y"
SNAPCMD=`which snap`

# Snap commands (options can be empty)
# Example for SNAPOPTIONS="--channel=edge"
SNAPINST="$SNAPCMD install"
SNAPREFRESH="$SNAPCMD refresh"
SNAPOPTIONS="" 

# Where to backup browser profile so user data is not accidentally destroyed
BACKUP=~/snap-testing-backup

# Tool to detect application window and close it
TIMER="xdotool"

# Log to save data
LOGF=~/startup-time-results.txt

#####################
##### Functions #####
#####################

pkg_install()
{
    # If installed, the command will complete without changes
    sudo $PKGMGR $PKGMGROPT $PTARGET
}

snap_install()
{
    # If installed and/or does not refresh, the commands will complete without changes
    sudo $SNAPINST $SNAPOPTIONS $STARGET 
    sudo $SNAPREFRESH $SNAPOPTIONS $STARGET 
}

timer_install()
{
    # If installed, the command will complete without changes
    sudo $PKGMGR $PKGMGROPT $TIMER
}

drop_caches()
{
    for i in 1 2 3; do echo $i | sudo /usr/bin/tee /proc/sys/vm/drop_caches; done
    sleep 2
}

cp_profiles()
{
    /bin/cp -r ~/.config/chromium $BACKUP/bak-pkg-chromium-profile-`/bin/date +%x-%H-%M-%S`
    /bin/cp -r ~/snap/chromium $BACKUP/bak-snap-chromium-profile-`/bin/date +%x-%H-%M-%S`
    sleep 2
}

detect_app_window()
{
    TIMERBIN=`which $TIMER`
    
    id=$1
    for w in `$TIMERBIN search --sync --onlyvisible --class "$id"`; do $TIMERBIN getwindowpid $w | xargs kill; done
}

pkg_run()
{
    echo -e "Native package runtime results:\n" | /usr/bin/tee -a $LOGF
    # EXplicitly calling binary under /usr/bin and not via which if snap is preferred in the PATH
    detect_app_window $PTARGET & /usr/bin/time -a -o $LOGF /usr/bin/$PTARGET
    echo -e "\n" | /usr/bin/tee -a $LOGF
    sleep 2
}

snap_run()
{
    echo -e "Snap package runtime results:\n" | /usr/bin/tee -a $LOGF
    detect_app_window $STARGET & /usr/bin/time -a -o $LOGF $SNAPCMD run $STARGET
    echo -e "\n" | /usr/bin/tee -a $LOGF
    sleep 2
}

################
##### Main #####
################

# Uncomment the function below to run
#pkg_install
#snap_install
#timer_install

# Create log file
touch $LOGF

# Data backup (optional)
# Uncomment the function below to run
#cp_profiles

# Cold run
echo -e "Cold run:\n" | /usr/bin/tee -a $LOGF
# Uncomment the functions below to run
#drop_caches
#pkg_run
#snap_run

# Hot run
echo -e "Hot run:\n" | /usr/bin/tee -a $LOGF
# Uncomment the functions below to run
#pkg_run
#snap_run

exit 0