linux-ext4 - Re: [Jfs-discussion] benchmark results

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Date:	Fri, 15 Jan 2010 22:42:38 +0100
From:	Edward Shishkin <edward.shishkin@...il.com>
To:	Larry McVoy <lm@...mover.com>, tytso@....edu,
	Christian Kujau <lists@...dbynature.de>,
	jim owens <jowens@...com>,
	jfs-discussion@...ts.sourceforge.net, linux-nilfs@...r.kernel.org,
	xfs@....sgi.com, reiserfs-devel@...r.kernel.org,
	Peter Grandi <pg_jf2@....for.sabi.co.UK>,
	ext-users <ext3-users@...hat.com>, linux-ext4@...r.kernel.org,
	linux-btrfs@...r.kernel.org
Subject: Re: [Jfs-discussion] benchmark results

> When things didn't match up that was a clue that either
>
>     - the benchmark was broken
>     - the code was broken
>   
[...]

I would carry out an object-oriented dualism here.

[1] methods (kernel module) ---- [2] objects (formatted partition)

 |                                |
 |                                |

[3] benchmarks ----------------- [4] user-space utilities (fsck)

User-space utilities investigate "object corruptions",
whereas benchmarks investigate "software corruptions"
(including bugs in source code, broken design, etc, etc..)

It is clear that "software" can be "corrupted" by a larger
number of ways than "objects". Indeed, it is known that
dual space V* (of all linear functions over V) is a much
more complex object than V.

So benchmark is a process which takes a set of methods
(we consider only "software" benchmarks) and puts numerical
values populated with a special (the worst) value CRASH.

Three main categories of benchmarks using:

1) Internal testing

An engineer makes optimizations in a file system (e.g. for a
customer) via choosing functions or plugins as winners in
a set of internal (local) "nominations".

2) Business plans

A system administrator chooses a "winner" in some (global)
"nomination" of file systems in accordance with internal
business-plans.

3) Flame and politics

Someone presents a "nomination" (usually with the "winner"
among restricted number of nominated members) to the public
while nobody asked him to do it.
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