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---
title: Pause all userspace processes
snippets_root_directory: snippets/gdb_sleep_all
snippets_language: bash
snippets:
main:
- gdb_sleep_all.sh
gdb:
- sleep.gdb
---
If you need to debug some kind of monitoring system (or just have some fun),
you might want to pause all userspace processes for a certain number of seconds
(to measure delays, etc.).
You can easily do this using GDB like this:
{% include jekyll-theme/snippets/section.html section_id='main' %}
sleep.gdb is a very simple GDB script; it basically sleeps for a determined
amount of seconds:
{% include jekyll-theme/snippets/section.html section_id='gdb' %}
You can simply run
sudo ./gdb_sleep_all.sh
and all of your userspace processes should be frozen for 30 seconds.
On a couple of servers, this worked quite well; not so well on my laptop with
Xfce installed.
Obviously, this would require a bit of work to adapt for containers as well.
Otherwise, pretty neat, huh?
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