IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 28 January 2015 (all times are UTC)
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| 00:55 | <map7> muppis, Found the issue was the fact I use zsh and zsh doesn't exist in my chroot. Adding it now.
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| 06:02 | <alkisg> map7: file an upstream bug about that
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| 06:02 | !ltsp-bug
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| 06:02 | <ltsp`> ltsp-bug: To file a bug report for upstream LTSP, go to https://bugs.launchpad.net/ltsp
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| 21:50 | <championofcyrodi> damn gnome keyring still dumping millions of temp keyrings in my user's .local keyring folder for chrome :(
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| 21:52 | https://bugzilla.gnome.org/show_bug.cgi?id=730587
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| 22:13 | <map7> work_alkisg, The bug has already been submitted. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=747178
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| 22:14 | <vagrantc> oh, that bug.
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| 23:06 | <championofcyrodi> it's official. ramdisk hosted nbd image is much faster for reading from multiple clients
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| 23:07 | <vagrantc> reading?
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| 23:07 | <championofcyrodi> well it's read only for the root image
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| 23:07 | let me rephrase...
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| 23:07 | * vagrantc is curious | |
| 23:07 | <championofcyrodi> on the server... copied the amd64.img to a ramdisk.
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| 23:08 | modded /etc/nbd-server/conf.d to point to the ramdisk
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| 23:08 | <vagrantc> raw device?
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| 23:08 | <championofcyrodi> tmpfs
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| 23:08 | <vagrantc> just put /opt/ltsp/images on tmpfs :)
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| 23:09 | <championofcyrodi> but then the image will be gone on reboot
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| 23:09 | and will have to be rebuilt
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| 23:09 | <vagrantc> make a backup and restore from it on reboot
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| 23:09 | <championofcyrodi> in /etc/fstab, i added an entry to create a 2GB fstab @ /mnt/ramdisk
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| 23:10 | then w/ nbd-server 'start', cp from images to ramdisk
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| 23:10 | similar
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| 23:10 | <vagrantc> right
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| 23:10 | might be worth integrating something like that upstream...
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| 23:10 | <championofcyrodi> getting ~ 96-100MB/sec for reads from /dev/nbd0 on the clients
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| 23:10 | on 1.0Gbps
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| 23:11 | which is the bottleneck (network)
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| 23:11 | the ram speed is around 6 GB/sec
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| 23:11 | * vagrantc also experimented with loading the nbd device into tmpfs on the client-side | |
| 23:11 | <championofcyrodi> i'm thinking about doing some link aggregation on my NFS server to get ~3.0Gbps with 3 NICs...
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| 23:11 | then switch from SSHFS to NFS
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| 23:12 | <vagrantc> how many clients you working with?
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| 23:12 | <championofcyrodi> currently we have 19 workstations
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| 23:12 | we bought 20, but i keep 1 for testing
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| 23:12 | <vagrantc> thin or fat clients?
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| 23:12 | <championofcyrodi> fat
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| 23:13 | we have a lot of development on apps like this : http://aperturetiles.com/twitter-heatmap/
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| 23:13 | so we need very fast X rendering
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| 23:14 | <vagrantc> and then NBD speed would also matter a fair amount
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| 23:16 | <championofcyrodi> hdparm showed about 100MB/sec.. vs. my desktop which shows 120MB/sec
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| 23:16 | desktop is SATA II
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| 23:16 | i believe that if we were on 10Gbps, NBD would crush SATA
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| 23:16 | if the image was in ramdisk on server side
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| 23:17 | RAM -> 10Gbps Ether -> RAM
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| 23:17 | for the app development, we forward the IDE and development tools from baremetal servers.
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| 23:17 | to the fat client's X
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| 23:18 | so the huge maven jobs that parse 4GB of JAR files runs acceptable.
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| 23:19 | the fat client is literally just for jumping off into a development server. Or running chrome, thunderbird, pidgin, pithos/spotify.
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| 23:19 | most of the data is hosted on distributed 'cloud' servers. aka apache hadoop
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| 23:20 | the developers are learning more about networking then they ever wanted to. :)
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| 23:21 | gotta run. night!
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| 23:23 | <vagrantc> championofcyrodi: thanks for sharing some info about your install!
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