IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 20 March 2011 (all times are UTC)
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| 06:26 | markit (~marco@88-149-177-66.staticnet.ngi.it) joined #ltsp. | |
| 06:26 | <markit> hi ppl :)
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| 06:27 | cyberorg (~cyberorg@opensuse/member/Cyberorg) joined #ltsp. | |
| 06:27 | <markit> 3 days ago something happend to my ltsp server that has damaged my faith on GNU/Linux reliability. I was on the server and opened a .jpg, then zoomed out to 25% with kolourpaint, and everything FROZE
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| 06:27 | all clients went abruptly disconnected
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| 06:28 | and every child stared at me with in a bad mood, lol
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| 06:28 | (fortunatly LibreOffice saves work times to times, but some work was neverless lost)
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| 06:49 | <alkisg> That's why they're slowing trying to make X-windows run as a normal user, not as root
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| 06:49 | So that if X crashes, the rest of the system continues to work
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| 06:50 | BSODs on windows, X crashes, kernel panics... C'est la vie
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| 11:19 | Q-FUNK (~q-funk@ubuntu/member/q-funk) joined #ltsp. | |
| 11:19 | <Q-FUNK> re
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| 11:20 | stgraber: in case that rings a bell, the xf86-video-nsc driver builds again, so older Geodes can be supported once more.
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| 11:53 | * highvoltage doesn't think that stgraber cares about geodes anymore :p | |
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| 13:07 | dlezcano (~dlezcano@AToulouse-159-1-50-19.w92-134.abo.wanadoo.fr) left irc: Ping timeout: 252 seconds | |
| 13:10 | <roasted> I just got this random question in my head.
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| 13:10 | If my test thin client with 128mb ram uses server resources due to it being the thin image, how is it that it crashed when I opened too much on it with only 128mb of ram?
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| 13:12 | <alkisg> Some apps like firefox or openoffice allocate local memory by some X server calls
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| 13:12 | I.e. x-pixmaps
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| 13:12 | You can see that memory with xrestop
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| 13:13 | To prevent those clients from crashing, you need either local or network swap
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| 13:13 | <roasted> network swap = swap on server?
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| 13:13 | <alkisg> Yes, NBD_SWAP=True in lts.conf
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| 13:13 | <roasted> under default?
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| 13:14 | <alkisg> If you want that for all clients, yes
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| 13:14 | You can also increase the default swap size, which is 64M
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| 13:14 | <roasted> should I go crazy and give my server like 16gb of swap?
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| 13:14 | <alkisg> Personally I use 512
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| 13:14 | No
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| 13:14 | <roasted> oh
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| 13:14 | lol
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| 13:14 | <alkisg> Those are sparse files created in /tmp
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| 13:14 | <roasted> I don't know what I used, because I did the dummy option
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| 13:15 | I normally do advanced partitioning since I almost always set up dual boot or split home/root setups, but this time I just used the dummy "erase entire disk and install" option
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| 13:15 | <alkisg> And that gave you what, 4 Gb swap?
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| 13:15 | <roasted> so if I have 2gb swap already allocated on the server I just add the NBD option and blam, good to go?
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| 13:15 | I'm not sure to be honest. I don't know how much swap that option allocates, as I so rarely use it.
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| 13:15 | <alkisg> Server swap has *nothing* to do with nbd_swap
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| 13:15 | <roasted> And my servers are at work, so...
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| 13:16 | I thought you just said network swap = server swap?
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| 13:16 | <alkisg> It's a swap file created on the /tmp directory on the server
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| 13:16 | It's created when the client boots. It's not related to the server swap partittions
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| 13:17 | So e.g. if you have 10 clients, you'll get 10x64M files in /tmp
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| 13:17 | <roasted> oh, so I don't have to do any special partitioning
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| 13:17 | I just enable NBD_SWAP=True in lts.conf
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| 13:17 | and we're done?
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| 13:18 | <alkisg> Yes, unless you want to increase the default swap file for each client, which is 64m
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| 13:19 | See the docs on the topic
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| 13:19 | dlezcano (~dlezcano@AToulouse-159-1-83-102.w92-136.abo.wanadoo.fr) joined #ltsp. | |
| 13:19 | <roasted> does NBD Swap have any benefits to fat clients, or just thin?
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| 13:19 | <alkisg> It's just swap.
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| 13:19 | Do you use swap for local installations?
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| 13:20 | Would you give swap to an ubuntu pc with 512M ram?
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| 13:20 | <roasted> I give swap to ANY install...
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| 13:20 | <abeehc> fat client doesn't mean you have a local swap partition neccesarily
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| 13:20 | <alkisg> Right, that's what I do to
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| 13:20 | *too
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| 13:20 | So I give 512M swap to anything, be it thin or fat, unless they have local swap
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| 13:22 | <roasted> so you adjust the 64 default setting too, I take it
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| 13:22 | or are you talking 512M swap total?
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| 13:22 | to clients
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| 13:22 | <abeehc> adjusting the setting and 512 total to clients
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| 13:22 | same thing i think
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| 13:22 | if you client doesn't have a disk anyway
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| 13:23 | <alkisg> $ cat /etc/ltsp/nbdswapd.conf
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| 13:23 | SIZE=512
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| 13:23 | That's per client
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| 13:23 | <roasted> gotcha. so that would help out my 128 meg test bed at work then.
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| 13:23 | <alkisg> So for 20 clients, that's 10 Gb (max, they're sparse files)
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| 13:23 | <roasted> and this is all /tmp?
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| 13:23 | <alkisg> Yes
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| 13:25 | <roasted> good deal
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| 13:25 | I'll give that a shot at work
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| 13:25 | Do you think it's worthwhile to change the default 64 setting? Or is 64 a good chunk for clients?
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| 13:26 | <alkisg> I've seen firefox use 400 mb of local memory on *thin* clients
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| 13:26 | <roasted> hahaha
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| 13:26 | <alkisg> So I don't think 64 is enough
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| 13:26 | <roasted> so that's a yes...
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| 13:26 | I wonder if thin + a good chunk of swap would be a good test bed too
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| 13:26 | instead of fat clients
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| 13:26 | just a thought to compare
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| 13:27 | <alkisg> When swap starts getting used, everything slows down to a crawl
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| 13:27 | <roasted> ah, really?
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| 13:27 | It's just a backup to prevent crashing?
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| 13:27 | <alkisg> It's just to prevent the client from crashing, and to store some of the tmpfs
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| 13:27 | <roasted> It may still be a good thing for me to incorporate.
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| 13:27 | Even if we don't utilize it.
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| 13:28 | When swap is used with /tmp, that's on the server, right
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| 13:28 | the actual /tmp
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| 13:28 | It doesn't use that locally I take it
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| 13:28 | <alkisg> So for sites with very large images, you'll see thin clients pausing for 1-2 secs (while swap is heavily used), and then they'll continue normally (x memory freed)
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| 13:28 | Server /tmp
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| 13:29 | <roasted> good deal
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| 13:30 | there's so many notes I've taken. It's amazing how easy it is to get LTSP running but how much you can do with it after that.
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| 00:00 | --- Mon Mar 21 2011 | |