[prev in list] [next in list] [prev in thread] [next in thread] 

List:       fedora-devel-list
Subject:    Re: Btrfs by default, the compression option
From:       Matthew Miller <mattdm () fedoraproject ! org>
Date:       2020-07-08 15:50:36
Message-ID: 20200708155036.GA18258 () mattdm ! org
[Download RAW message or body]

On Wed, Jul 08, 2020 at 12:24:27AM -0600, Chris Murphy wrote:
> 2. Benchmarking: this is hard. A simple tool for doing comparisons
> among algorithms on a specific bit of hardware is lzbench.
> https://github.com/inikep/lzbench
> How to compile on F32.
> https://github.com/inikep/lzbench/issues/69
> But is that adequate? How do we confirm/deny on a wide variety of
> hardware that this meets the goal? And how is this test going to
> account for parallelization, and read ahead? Do we need a lot of data
> or is it adequate to get a sample "around the edges" (e.g. slow cpu
> fast drive; fast cpu slow drive; fast cpu fast drive; slow cpu slow
> drive). What algorithm?

More data is always better. I like qualifying the situations in that way. I
think we should make our decision based on the "center" rather than the
edges, though.

For I hope obvious reasons, I'd love to see this tested on a Lenovo X1
Carbon Gen 8 with the default SSD options.

And, for benchmarks, I'm thinking more application benchmarks than a
benchmark of the compression itself. How much does compressed /usr affect
boot times for GNOME and KDE? What about startup time for LibreOffice,
Firefox, etc? Any impact on run-time usage?


[...]
> D. Which directories? Some may be outside of the installer's scope.

As I noted in the bugzilla entry, the /var/log on this system compresses to
3.6% of its original size.

(Methodology: I tarred up the dir and then ran zstd -1 on the tar file. If I
use -19, it's unsurprisingly slow and saves another whole one percent of the
original.)

-- 
Matthew Miller
<mattdm@fedoraproject.org>
Fedora Project Leader
_______________________________________________
devel mailing list -- devel@lists.fedoraproject.org
To unsubscribe send an email to devel-leave@lists.fedoraproject.org
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org

[prev in list] [next in list] [prev in thread] [next in thread]