IRC chat logs for #ltsp on irc.freenode.net (webchat)


Channel log from 20 March 2011   (all times are UTC)

01:32komunista (~slavko@adsl-195-098-015-248.dynamic.nextra.sk) joined #ltsp.
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06:26
<markit>
hi ppl :)
06:27cyberorg (~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
06:27
all clients went abruptly disconnected
06:28
and every child stared at me with in a bad mood, lol
06:28
(fortunatly LibreOffice saves work times to times, but some work was neverless lost)
06:49
<alkisg>
That's why they're slowing trying to make X-windows run as a normal user, not as root
06:49
So that if X crashes, the rest of the system continues to work
06:50
BSODs on windows, X crashes, kernel panics... C'est la vie
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11:19
<Q-FUNK>
re
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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13:07dlezcano (~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.
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?
13:12
<alkisg>
Some apps like firefox or openoffice allocate local memory by some X server calls
13:12
I.e. x-pixmaps
13:12
You can see that memory with xrestop
13:13
To prevent those clients from crashing, you need either local or network swap
13:13
<roasted>
network swap = swap on server?
13:13
<alkisg>
Yes, NBD_SWAP=True in lts.conf
13:13
<roasted>
under default?
13:14
<alkisg>
If you want that for all clients, yes
13:14
You can also increase the default swap size, which is 64M
13:14
<roasted>
should I go crazy and give my server like 16gb of swap?
13:14
<alkisg>
Personally I use 512
13:14
No
13:14
<roasted>
oh
13:14
lol
13:14
<alkisg>
Those are sparse files created in /tmp
13:14
<roasted>
I don't know what I used, because I did the dummy option
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
13:15
<alkisg>
And that gave you what, 4 Gb swap?
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?
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.
13:15
<alkisg>
Server swap has *nothing* to do with nbd_swap
13:15
<roasted>
And my servers are at work, so...
13:16
I thought you just said network swap = server swap?
13:16
<alkisg>
It's a swap file created on the /tmp directory on the server
13:16
It's created when the client boots. It's not related to the server swap partittions
13:17
So e.g. if you have 10 clients, you'll get 10x64M files in /tmp
13:17
<roasted>
oh, so I don't have to do any special partitioning
13:17
I just enable NBD_SWAP=True in lts.conf
13:17
and we're done?
13:18
<alkisg>
Yes, unless you want to increase the default swap file for each client, which is 64m
13:19
See the docs on the topic
13:19dlezcano (~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?
13:19
<alkisg>
It's just swap.
13:19
Do you use swap for local installations?
13:20
Would you give swap to an ubuntu pc with 512M ram?
13:20
<roasted>
I give swap to ANY install...
13:20
<abeehc>
fat client doesn't mean you have a local swap partition neccesarily
13:20
<alkisg>
Right, that's what I do to
13:20
*too
13:20
So I give 512M swap to anything, be it thin or fat, unless they have local swap
13:22
<roasted>
so you adjust the 64 default setting too, I take it
13:22
or are you talking 512M swap total?
13:22
to clients
13:22
<abeehc>
adjusting the setting and 512 total to clients
13:22
same thing i think
13:22
if you client doesn't have a disk anyway
13:23
<alkisg>
$ cat /etc/ltsp/nbdswapd.conf
13:23
SIZE=512
13:23
That's per client
13:23
<roasted>
gotcha. so that would help out my 128 meg test bed at work then.
13:23
<alkisg>
So for 20 clients, that's 10 Gb (max, they're sparse files)
13:23
<roasted>
and this is all /tmp?
13:23
<alkisg>
Yes
13:25
<roasted>
good deal
13:25
I'll give that a shot at work
13:25
Do you think it's worthwhile to change the default 64 setting? Or is 64 a good chunk for clients?
13:26
<alkisg>
I've seen firefox use 400 mb of local memory on *thin* clients
13:26
<roasted>
hahaha
13:26
<alkisg>
So I don't think 64 is enough
13:26
<roasted>
so that's a yes...
13:26
I wonder if thin + a good chunk of swap would be a good test bed too
13:26
instead of fat clients
13:26
just a thought to compare
13:27
<alkisg>
When swap starts getting used, everything slows down to a crawl
13:27
<roasted>
ah, really?
13:27
It's just a backup to prevent crashing?
13:27
<alkisg>
It's just to prevent the client from crashing, and to store some of the tmpfs
13:27
<roasted>
It may still be a good thing for me to incorporate.
13:27
Even if we don't utilize it.
13:28
When swap is used with /tmp, that's on the server, right
13:28
the actual /tmp
13:28
It doesn't use that locally I take it
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)
13:28
Server /tmp
13:29
<roasted>
good deal
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