Date: Wed, 10 Apr 2002 03:09:18 -0700 From: Benjamin Krueger <benjamin@macguire.net> To: Patrick Thomas <root@utility.clubscholarship.com> Cc: dnelson@allantgroup.com, freebsd-questions@freebsd.org Subject: Re: overhead: sshd x 5 or screen ? Message-ID: <20020410030918.B4277@rain.macguire.net> In-Reply-To: <20020410005847.A4277@rain.macguire.net>; from benjamin@macguire.net on Wed, Apr 10, 2002 at 12:58:47AM -0700 References: <20020409151352.R59130-100000@utility.clubscholarship.com> <20020409225208.GF84522@dan.emsphone.com> <20020410005847.A4277@rain.macguire.net>
next in thread | previous in thread | raw e-mail | index | archive | help
* Dan Nelson (dnelson@allantgroup.com) [020409 15:53]: > In the last episode (Apr 09), Patrick Thomas said: > > I am wondering what causes more overhead (disk, memory, and processor > > utilization): > > > > - running 5 concurrent ssh connections into a FreeBSD server > > > > - running 1 ssh connection into a FreeBSD server, and using `screen` to > > create 5 windows ? > > 5 sshs, because any output from session is encrypted and sent over the > wire, where with screen only output to the visisble window is sent. I'm not sure I follow the logic you're using here. How does being encrypted and sent over the wire reduce overhead? He did not mention whether this was a concern for the client or server, but assumably its server. I should say that all things being equal, a single ssh session with a single screen session is going to cause less load on the server. Consider that each network connection uses additional resources. 5 connections rather than 1. Each individual connection does utilize unique resources. Consider also that you need to encrypt 5 unique sshd sessions, rather than 1. Using a shared library will help reduce the memory footprint, but not the cpu usage. What you get are 4 extra network connections, and 4 extra sshd instances to replace 1 instance of screen. Somehow, I think screen is going to come out the winner. :) -- Benjamin Krueger "Life is far too important a thing ever to talk seriously about." - Oscar Wilde (1854 - 1900) ---------------------------------------------------------------- Send mail w/ subject 'send public key' or query for (0x251A4B18) Fingerprint = A642 F299 C1C1 C828 F186 A851 CFF0 7711 251A 4B18 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20020410030918.B4277>