IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 12 November 2011 (all times are UTC)
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| 00:19 | <jvin> alkisg, I agree ltsp is more than X, but I remember having a lot of fiddling with X at times when I was working with it more regularly ~2005/6. I figured that ltsp would be involved closely with whatever new solution that was replacing X.
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| 00:21 | and probably already seeing what's on the horizon a lot earlier than everyone else .. so thought I'd ask.
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| 06:03 | <vagrantc> !seen sbalneav
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| 06:03 | <ltsp> vagrantc: sbalneav was last seen in #ltsp 1 day, 1 hour, 34 minutes, and 25 seconds ago: <sbalneav> night all
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| 21:34 | <alkisg> Case study... epoptes is asking thin client to send screen thumbnails to the teacher.
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| 21:34 | We experienced rare crashes under heavy load, and were trying to troubleshoot it for a couple of days now.
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| 21:34 | It turns out that it was asking the whole screen from the X server (=LTSP client) to the X client (=LTSP server) and *then* it did the resize operation.
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| 21:34 | On extreme load, with video playing + iperf stressing the network, that sometimes took even more than 10 secs, as opposed to the usual few msec!
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| 21:34 | We'll switch to using pixmaps to do x-server-side scaling with cairo, but it was educating to see why thin clients crawl when xvideo plays, even if the video itself plays fine.
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| 21:35 | * vagrantc waves to alkisg | |
| 21:35 | <alkisg> Hey
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| 21:42 | * alkisg is dizzy after 2 days of trying to troubleshoot python/amp/network related problems, to find out it was just X taking toooooo long over the network :) | |
| 21:45 | * vagrantc hasn't had a chance to test ssvnc | |
| 21:46 | <alkisg> For the next adventure, I'd like to try gstreamer for screen grabbing as a video stream, and then multicasting, either with gstreamer or vlc
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| 21:46 | If we can do that, we'll be able to show descent FPS on even 100mbps lans
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| 21:47 | Not for video broadcasting; just for teacher screen broadcasting. Ximagesrc: http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good-plugins/html/gst-plugins-good-plugins-ximagesrc.html
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| 21:48 | <vagrantc> libnss-sshsock only seems to work with UIDs/GIDs above 500 ... not sure how we'll plug it into LDM or lightdm or whatever ... and how will we get the groups a person is a member of
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| 21:49 | <alkisg> vagrantc: aren't the low-level GIDs supposed to be created by the system?
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| 21:49 | E.g. for access to sockets and stuff? If they don't already exist in the client, what good would it do to create them?
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| 21:50 | E.g. if I'm a member of vboxusers, why would I want to get that on a thin client if I don't have vbox installed + the group already there?
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| 21:50 | <vagrantc> alkisg: you'll have inconsistant group info for sshfs and maybe NFS mounts, then.
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| 21:50 | and if you do install the group locally, the user won't be a member of it.
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| 21:51 | <alkisg> True. I wonder if those support sockets though
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| 21:51 | <vagrantc> so we're close ... just need to keep scotty excited to keep cranking on it :)
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| 21:51 | i haven't been very sucessful using libpam-sshauth either :(
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| 21:52 | i should've uploaded that to experimental, too.
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| 21:52 | <alkisg> Gadi said that he got it working?
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| 21:53 | <vagrantc> dunno. i just don't quite understand how to set it up, given the docs.
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| 22:16 | <alkisg> vagrantc: I'm pondering rewritting the "screenshot" tool in C... that would mean we'd have compiled code, different .debs for different architectures etc... is that bad somehow?
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| 22:17 | <vagrantc> alkisg: only a little
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| 22:32 | <alkisg> $ time sh -c 'i=0; while [ $i -lt 100 ]; do ./python-screenshot 200 150 > /dev/null; i=$(($i+1)); done'
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| 22:32 | real 0m17.564s
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| 22:32 | $ time sh -c 'i=0; while [ $i -lt 100 ]; do ./c-screenshot; i=$(($i+1)); done'
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| 22:32 | real 0m2.293s
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| 22:32 | vagrantc: I'm tempted to switch to C.... ^
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| 22:47 | <matrix3000> alkisg: about that z stuff i was doing
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| 22:47 | now have all thin clients running the main part on themselves, taking load off the main server
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| 22:48 | very nice
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| 23:47 | <alkisg> Phiew. Finally managed to do x-server-side scaling, in python, in 0.07 secs, not bad, not worth the C switch
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| 23:57 | <vagrantc> alkisg: well, arch-dependent aren't a big deal
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| 23:57 | alkisg: if you did decide to go with C
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| 23:57 | <alkisg> It's 0.02 secs there
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| 23:58 | So for a server with 50 clients it would make a difference
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| 23:58 | I'll keep the C implementation in case we need it in the future
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| 23:58 | For standalone clients it won't make a difference, as it's just 1 thumbnail per 5 seconds
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| 23:58 | <vagrantc> alkisg: could make it possible to use either
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| 23:59 | alkisg: and ship both
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| 23:59 | <alkisg> Well if we're going to have C in the package, no need to have python there
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| 23:59 | <vagrantc> in a separate package
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| 23:59 | <alkisg> I think we can switch when we write the whole client in C
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| 23:59 | <vagrantc> makes sense
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| 23:59 | <alkisg> With SSL + reconnections + inside the X session etc
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