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Re: When a hashed pathname is deleted, search PATH

From: Linda Walsh
Subject: Re: When a hashed pathname is deleted, search PATH
Date: Fri, 21 Mar 2014 18:48:21 -0700
User-agent: Thunderbird

Chris Down wrote:
You don't use heuristics when you have access to the underlying
mechanisms, that's an extremely poor way to program, and an extremely
good way to accrue technical debt.

Mike Frysinger wrote:
as soon as you talk about trying to time something, you're obviously looking at it wrong. having a system that only works when the cpu/disk is fast and idle is a waste of time and bad for everyone.

BTW -- as far as using heuristics and timing and whether or not that
is "bad", you might check to see how the the linux kernel is written.
As an example, I saw this today: http://oss.sgi.com/pipermail/xfs/2014-March/034977.html

It talks about using a speculative heuristic with a timing window
to trim speculation.  I've seen other similar algorithms in the kernel
as well.

Using heuristics and timing to adapt to external behaviors is an
advanced programming method -- the key is knowing when to use it.
It really is entering into the realm of AI programming.

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