Editing Test Day:2020-07-06 Swap on ZRAM

{{Infobox_group
| name = Fedora Test Day
| image = [[File:Echo-testing-48px.png|link=QA/Test Days]]
| caption = [[SwapOnZRAM]]
| date = TBD
| time = all week
| website = [[QA/Test Days]]
| irc = [irc://irc.freenode.net/#fedora-test-day #fedora-test-day] ([http://webchat.freenode.net/?channels=fedora-test-day webirc])
| fedora_mailing_list = test
}}

{{admon/note | Can't make the date? | If you come to this page before or after the test day is completed, your testing is still valuable, and you can use the information on this page to test, file any bugs you find at [http://bugzilla.redhat.com Bugzilla], and add your results to the results section. If this page is more than a month old when you arrive here, please check the [[QA/Test_Days|current schedule]] and see if a similar but more recent Test Day is planned or has already happened.}}

== What to test? ==

Today's installment of Fedora Test Day will focus on testing '''[[Changes/SwapOnZRAM]]'''. 

== Who's available? ==

The following cast of characters will be available for testing, workarounds, bug fixes, and general discussion ...
* Development - [[User:chrismurphy|chrismurphy]] (cmurf), [[User:zbyszek|zbyszek]]
* Quality Assurance - [[User:Sumantrom|Sumantro Mukherjee]] (sumantrom), [[User:kparal|Kamil Paral]] (kparal), [[User:coremodule|Geoff]] (coremodule), [[User:adamw|Adam Williamson]] (adamw)

== Prerequisites for Test Day == 

<ol>
<li> A virtual machine or a bare metal machine. Using low-memory machines like ARM boards, netbooks or old PCs is very helpful, because it's much easier to run out of available memory on them. But this feature can also be tested on high-performance workstations and servers with lots of RAM.
<li> Any Fedora Edition or Spin in version 31, 32 or Rawhide.
<li> Install `zram-generator`:
<pre>sudo dnf install zram-generator
sudo cp /usr/share/doc/zram-generator/zram-generator.conf.example /etc/systemd/zram-generator.conf</pre>
<li> Edit `/etc/systemd/zram-generator.conf` and set these values:
<pre>[zram0]
memory-limit = none
zram-fraction = 0.5</pre>
<li> Optionally remove the following packages. The swap-on-zram implementations in those packages have minor conflicts with `zram-generator`, but mostly they'll just contribute to user confusion.
<pre>sudo dnf remove anaconda zram</pre>
</ol>


== How to test? ==

Simple memory hogging test: Open dozens of Firefox tabs, until memory and swap fill up.

Optional: [https://github.com/sergey-senozhatsky/zram-perf-test zram performance testing toolset] This is a bit more complex to get setup and understand the results. But could be useful to confirm/deny the default compression algorithm: lzo-rle is a good default across many architectures and general purpose workloads.

=== Run the tests ===


== Reporting bugs ==

If you have problems with any of the tests, have a look in the [http://testdays.fedorainfracloud.org/events/86 results page]. Please include the vulnerability output at the end of the test suite in the comments. 

If you don't see it, please file a new bug to [https://bugzilla.redhat.com Bugzilla], probably against <code>rust-zram-generator</code> component.  If you are unsure about exactly how to file the report or what other information to include, just ask on IRC #fedora-test-day or #fedora-qa and we will help you.

[[Category:Fedora 33 Test Days]]