Re: question/problem about forking in expect
From: Cameron Laird (claird_at_lairds.com)
Date: 04/30/03
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Date: Wed, 30 Apr 2003 11:55:44 -0000
In article <3EADABC0.B3AB7FB6@gmx.de>,
Marco Horner <Marco.Horner@gmx.de> wrote:
>Hi,
>
>translating from german to english what i want to say is hard business ...
>
>
>i know that telnet from H0 to H1 and then to get a config from server
>F1 per ftp
>is a very, very stupid example.
>
>but this is not my focus.
>(for the test i've made few minutes ago i decided to telnet to a host and then
>send a "uname -a" on this host. ;-))
>
>my focus is on the fork-> Maybe somebody can say due to his/her
>experience if my
>code is right or false?
>
>
>i've never tested this script with forking with 500 routers. it's only in my
>testlab with the 3 suns.
>i ve tested a similar script with 30 machines but the load of the
>machine where
>expect runs on increases much.
>
>page 446: i will think about it. i can't understand it not yet.
.
.
.
To my shame, I don't read German.
I see a couple of issues. One is how to fork. Another
is how to manage network monitoring of hundreds of hosts.
All my experience is that [fork]ing is NOT part of the
solution of the latter. Yes, you need some sort of con-
currency to monitor all your hosts satisfyingly; forking,
though, or even a thread-based concurrency model, will
NOT give the performance and reliability you're after.
You need an event-based model, or, in Unix programming
terms, one founded on select().
That's the subject of page 446.
A couple of tasks remain. One is to analyze your source
code, and explain why [fork] gives you results that
surprise you. More urgent than that is to write an
[expect_background] example or two to help you make good
use of this interface in your development work.
It might be a week before Don, I, or someone else can help
you more with these items.
-- Cameron Laird <Cameron@Lairds.com> Business: http://www.Phaseit.net Personal: http://phaseit.net/claird/home.html
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