[CLUE-Cert] (no subject)

[Dave Anselmi]

Jef Barnhart wrote:

> Hey folks,
>
> I was talking about compile time optimizations here is an article showing the stuff. This is the cool stuff that you can do when you are installing distros such as LFS or Gentoo. I have tried some of the optimizations to some success.
>
> http://www.linuxjournal.com//article.php?sid=5886

Perhaps I should read the book they reference as I've been looking for a good description of what the optimizations do (the gcc docs are not good, IMO--but I'm not a compiler writer).  For example, why the difference between -O9 for i686
and -O3 for i586?  How do you know whether you have a 686 or a 586?  gcc 3 has a athlon march and mcpu, but gcc 2 does not.  So for an athlon, is i686 better, or is k7?  I don't know.  This is pretty arcane, so I'm not sure anyone knows.

Also, when doing LFS, I had some stability problems with optimizations.  IIRC, it was doing -O3 on the kernel.  I think the kernel make files set -O2, and make it hard to change which is a good thing.

Dave



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Date: Sat, 09 Mar 2002 08:39:39 -0700
From: Lynn Danielson <lynnd at techangle>
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Subject: Re: [CLUE-Cert] UnixReview article
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Jef Barnhart wrote:

>Here is an article that is worth reading. It goes over the LPI 202 exam.
>
>http://www.unixreview.com/documents/s=2425/uni1015360112902/0203a.htm
>
>Since we are going over networking it may be of our best interest to make sure that we understand, "grok" the very fine points.
>
I agree, this looks like a good article to study from.  Nicely laid out 
with references.
I believe we all agreed to continue using the Sair study guide materials 
for now, but
let's plan to use this document as well.  I'll try to make several 
printouts of it and
perhaps printout a couple of the documents it references as well.

Is anyone familiar with the "nc" command which is mentioned in section 
2.205.2?

Lynn