Sometimes those machines are just mysterious. Well, LDM_DIRECTX really
reduces ssh's CPU usage to zero. But still Maple was unusable. I
checked the gnome display settings and found a second display that was
activated with 640x480 that was right in the "real display". How come?
No idea.
Here's my lts.conf:
[default]
LDM_DIRECTX = True
NETWORK_COMPRESSION = False
XRANDR_DISABLE = "True"
CONFIGURE_X = "True"
USE_XFS = "True"
XFS_SERVER = "10.153.106.228"
SYSLOG_HOST = "10.153.106.236"
[S500-6]
X_MODE_0 = "1920x1200"
If xrandr is not disabled ldm comes up with 640x480.
I deactivated the second display manually in display settings and CPU
usage of xorg was reduced massively. Now Maple is at least usable,
still lagging a bit, but much better. How can I disable the second
display for all users or better get rid of it? Does xrandr work for
you with the correct screen resolution?
Peter
2009/8/12 Frank Bergmann <[email protected]>:
> Java should work quicker via NX-Connection.
> So you could install the freenx Server on your sever and a fat client
> that boots a small desktop und autostarts the nomachine client.
> Maybe you should test this first: Boot a client from cd, install
> nomachine client and see how it goes.
> Frank
>
> 2009/8/12 Peter Stein <[email protected]>
>>
>> Compiz is disabled. LDM_DIRECTX didn't help. Video drivers are ok, I
>> use the free radeon drivers, they are well tested.
>> How should I install such software as Maple, Mathematica locally ...
>> This software needs some kind of computer power. The programs are
>> huge. That's why we have our workstations and not a thin client.
>> Unfortunately this doesn't look like a good plan. So what is left?
>>
>> 2009/8/11 Gideon Romm <[email protected]>:
>> > Peter,
>> >
>> > You have several options available:
>> >
>> > 1. LDM_DIRECTX (set to True in lts.conf, video will not be tunneled
>> > through ssh and go back to the client directly)
>> >
>> > 2. LOCAL_APPS - install java and java programs in the chroot and run
>> > them as local apps rather than from the server - do the same with ff and
>> > plugins
>> >
>> > 3. See if you have the optimal video drivers for the thin client
>> >
>> > 4. Disable compiz if it is running on the server
>> >
>> > These are off the top of my head.
>> >
>> > -Gadi
>> >
>> >
>> > On Tue, 2009-08-11 at 18:34 +0200, Peter Stein wrote:
>> >> Dear LTSP users,
>> >>
>> >> when it comes to convince somebody of LTSP the usability and feeling
>> >> is crucial. After setting the chroot up we started testing. And here
>> >> the real problems begin. Our users are scientists, they work for hours
>> >> in front of their monitor and they are *sorry* pissed if the computer
>> >> is somewhat sluggish or unusable.
>> >> We have enormous problems using Java programs like xmaple and others.
>> >> Some are usable, some not. I am aware of the bug here
>> >> https://bugs.launchpad.net/ubuntu/+source/ia32-libs/+bug/277069 and
>> >> installed the libxcb package of Ubuntu karmic which improved the speed
>> >> a lot. But still it sucks to work with thin clients somehow.
>> >>
>> >> - moving windows is sometimes decelerated
>> >> - firefox dropdown menus still open slowly sometimes (not in konqueror)
>> >> - input in some java programs like xmaple lags - the program is not usable
>> >> - videos are not shown with enough fps
>> >>
>> >> I have analyzed the traffic a little bit. If you move a window like
>> >> gnome-terminal traffic jumps to 5-6 MB/s sometimes. CPU of xorg goes
>> >> up to 45%, ssh uses 20%. If one uses xmaple or other Java programs
>> >> load goes up to 1.15 which is too much for a single core terminal,
>> >> traffic jumps to 14-15 MB. This is more than maximum for a 100 MBit/s
>> >> connection, which is still kind of standard (but tested with GBit/s).
>> >>
>> >> We use:
>> >> Ubuntu Jaunty for servers and chroot
>> >> terminals have sempron 2100+ (that's not really slow for a terminal)
>> >> ATI X1200 with free radeon driver
>> >> the server I used for testing has more than enough power: 8 cores and
>> >> 16GB RAM
>> >>
>> >> I also tried hpn-ssh http://www.psc.edu/networking/projects/hpn-ssh/
>> >> with no sufficient result.
>> >> So the problem is:
>> >>
>> >> In many cases (like moving a window etc.) xorg and ssh use too much
>> >> cpu. We changed ssh encryption to blowfish which helped only a little.
>> >> What can I do to improve this situation. I ran out of ideas. One
>> >> important program which doesn't work, is enough to make this project
>> >> rubbish. All my work was for nothing and that would be very
>> >> disappointing.
>> >>
>> >> Thank you very much.
>> >>
>> >>
>> >>
>> >> Peter
>> >>
>> >> ------------------------------------------------------------------------------
>> >> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
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>> >> trial. Simplify your report design, integration and deployment - and
>> >> focus on
>> >> what you do best, core application coding. Discover what's new with
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>> >> _____________________________________________________________________
>> >> Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto:
>> >> https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
>> >> For additional LTSP help, try #ltsp channel on irc.freenode.net
>> > --
>> > --------------------------------------------------------
>> > Gideon Romm | Proud LTSP Developer
>> > [email protected]
>> >
>> > Support LTSP! Buy your hardware at:
>> >
>> > www.DisklessWorkstations.com
>> > www.DisklessThinClients.com
>> >
>> > (use coupon code: LTSP5P for 5% off thin clients from
>> > DisklessThinClients.com)
>> >
>> >
>> > ------------------------------------------------------------------------------
>> > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
>> > trial. Simplify your report design, integration and deployment - and focus
>> > on
>> > what you do best, core application coding. Discover what's new with
>> > Crystal Reports now. http://p.sf.net/sfu/bobj-july
>> > _____________________________________________________________________
>> > Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto:
>> > https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
>> > For additional LTSP help, try #ltsp channel on irc.freenode.net
>> >
>>
>>
>>
>> --
>> Agnes-Bernauer-Strasse 53b
>> 80687 Muenchen
>>
>> Mobile: +49-176-61576306
>>
>> ------------------------------------------------------------------------------
>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
>> trial. Simplify your report design, integration and deployment - and focus on
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>> _____________________________________________________________________
>> Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto:
>> https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
>> For additional LTSP help, try #ltsp channel on irc.freenode.net
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now. http://p.sf.net/sfu/bobj-july
> _____________________________________________________________________
> Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto:
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> For additional LTSP help, try #ltsp channel on irc.freenode.net
>
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