Automatically suspend inactive X11 applications.
When an application window loses focus, XSuspender tries to match it to one of the rules in its configuration. If a match is found, the application is sent a SIGSTOP signal (preventing the process from obtaining further CPU time). Upon windows regaining focus, the process is seamlessly continued where it had left off.
- Reduce battery use (increase battery run-time).
Make your laptop run on battery for as long as your mobile phone does, using roughly the same technique. - Reduce interaction latency on low-end CPUs.
With fewer clients requesting processing power, there's more of it to go around where it's needed. - Reduce CPU fan noise.
Save the tinnitus for old age. - Avoid apps plotting stuff behind your back.
That Kali you're running in a VM is perfectly fine, but god only knows what Microsoft Windos is doing. - Suspend processes using well-known Unix signals SIGSTOP & SIGCONT ...
... or custom shell scripts. Decades of portable operating systems engineering at its finest. - Preconfigured for recent versions of popular software.
Chromium, Firefox, JetBrains IDEs, qBittorrent, VirtualBox ...
- Quirky. See Notes below.
- May prevent suspended windows from redrawing until re-gaining focus.
- May make your web downloads stall and your in-browser media playback stop if you configure it thus.
- Prevents pasting from clipboard while the selection source process is suspended (explanation).
- Relies on windows having their
_NET_WM_PID
hint set correctly. - Won't work in remote X sessions.
- Won't work with Wayland.
See section BUGS in the manual for the full, updated list.
Install binary package for your GNU/Linux distribution:
# Install dependencies, namely GLib, Libwnck, procps
# on Debian / Ubuntu / Mint:
sudo apt install libglib2.0-dev \
libwnck-3-dev \
procps \
make cmake gcc pkg-config
# on Fedora / RHEL / openSUSE / Solus:
sudo dnf install glib2-devel \
libwnck3-devel \
procps-ng \
make cmake gcc pkg-config
# Fetch a copy of the source code
git clone https://github.com/kernc/xsuspender
cd xsuspender
# Move to build directory for an out-of-tree build
cd build
# Configure and make
cmake -DCMAKE_INSTALL_PREFIX=/usr/local ..
make
make test
# Install within chosen prefix
sudo make install
For brief usage instructions, run:
xsuspender --help
Upon installation there will be a /etc/xdg/autostart/xsuspender.dektop
file which allows you to autostart xsuspender on the start of your
desktop. You need to explicitly enable autostarting xsuspender in your
desktop's session management settings - this amounts to the same as copying
/etc/xdg/autostart/xsuspender.dektop
to ~/.config/autostart/
and setting
Hidden=false
.
If you let xsuspender autostart, then you need to be aware of spurious suspended app lock-ups such as in GH-11 and be ready to mitigate them.
To have it print verbose debug messages about what it is doing, run the
program with environmental variable G_MESSAGES_DEBUG=xsuspender
set:
G_MESSAGES_DEBUG=xsuspender xsuspender
This is strongly recommended to confirm your customized configuration rules indeed work as you expect.
If xsuspender is autostarted by your X session manager, you might find clues
to its unexpected behavior in ~/.xsession-errors
.
- Processes that take a long time to shut down after their window already
disappears may be stopped in the middle of their termination routines.
Avoid with reasonably generous
suspend_delay
. - Windows that minimize to system tray need to be awaken frequently to respond to click events in a seamless manner.
- Don't configure xsuspender for software you want to keep continuously alive in the background, such as music players, daemons, IM clients ... If you frequently stream music from YouTube, you might give Clementine, Minitube, YouTube Viewer or SMTube a try.