localapps

[rmcdaniel at indata.us]

Robert,

I have firefox running as a local app and it is working great.  I am
trying to setup an icon that the kids can click on to take them to a
specific site, www.kclogin.com.  This is a flash based program that we
have been testing.  I can't simply make a shotcut to the site like I
would typically do with Firefox (drag and drop the address from the
toolbar to the desktop).  I have tried several switches from the command
line to start localapp firefox with a specific URL.  The switches don't
seem to work.  The exact command that I was trying is
/usr/bin/ltsp-localapps  /usr/bin/firefox -url http://www.kclogin.com. 
Do you know of any way that this can be accomplished.  This is for the
young kids, the older kids can just simply type the site in the address
bar.

Thanks,

Ron


-------- Original Message --------
Subject: RE: very slow login times
From: <rmcdaniel at indata.us>
Date: Thu, November 06, 2008 1:13 pm
To: "Development discussion of K12Linux"
<k12linux-devel-list at redhat.com>

I found one of your post addressing this! Thanks.

http://www.mail-archive.com/ltsp-discuss@lists.sourceforge.net/msg35351.html

-------- Original Message --------
Subject: Re: very slow login times
From: "Robert Arkiletian" <robark at gmail.com>
Date: Thu, November 06, 2008 12:13 pm
To: "Development discussion of K12Linux"
<k12linux-devel-list at redhat.com>

On 11/6/08, rmcdaniel at indata.us <rmcdaniel at indata.us> wrote:
> Here's the scoop this morning. I have run all updates on the server and
> rebuilt the client /opt/ltsp/i386 to make sure that I had all current
> updates applied. I am still seeing excessive bandwidth used on the
> switch with just 1 thin client attached and booting off of the server.
> To eliminate any network suspicion, I have a regular pc with XP running
> off of the same switch in the lab. When I access a youtube video with
> the thin client, I max my switch port at 100% utilization with 100%
> unicast packets. When I access the same youtube video with the pc, the
> switch utilization is very low 2%. It seems like some great
> inefficiencies in the networking protocols on the thin clients. I can

Ron this is normal. Youtube is not a good test to see if your setup is
over utilizing network bandwidth. Youtube will saturate a 100Mbps
connection. I have tried running a youtube video as a local app and
the network usage drops dramatically. Here's why.

Flash is a highly compressed video format. The SERVER decompresses it
and THEN pushes the decompressed stream to the X server on the client.
This is inefficient for 2 reasons.

1) the server is taking the cpu load to do the decompression
2) your lan is being saturated with decompressed video image data

Try running firefox as a local app and watch the network utilization
on gnome-system-monitor

This is a big reason why local apps is so important.

-- 
Robert Arkiletian
Eric Hamber Secondary, Vancouver, Canada
Fl_TeacherTool http://www3.telus.net/public/robark/Fl_TeacherTool/
C++ GUI tutorial http://www3.telus.net/public/robark/

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