[Edubuntu] For shared (project team) folder, ACLs change group of moved-in files?

[John Hupp]

On 1/24/2013 2:45 AM, Alkis Georgopoulos wrote:
> Στις 24/01/2013 03:00 πμ, ο/η John Hupp έγραψε:
>> So with the experience in the Greek schools, can more be said about
>> performance?
>
> You don't need other people's advice on something you can easily 
> measure yourself.
> Here's a comparison between NORMAL, BINDFS, SSHFS and NFS for copying 
> an .iso:
>
> ================================================================
> root at pc:/NORMAL/dir# echo 3 > /proc/sys/vm/drop_caches
> root at pc:/NORMAL/dir# time cp ubuntu-12.04.1-desktop-i386.iso \
>                              ubuntu-12.04.1-desktop-i386.iso.bak
> real    0m29.371s
> user    0m0.020s
> sys    0m2.048s
> CPU (via top): 50% idle, 40% wait
> ----------------------------------------------------------------
> root at pc:/BINDFS/dir# echo 3 > /proc/sys/vm/drop_caches
> root at pc:/BINDFS/dir# time cp ubuntu-12.04.1-desktop-i386.iso \
>                              ubuntu-12.04.1-desktop-i386.iso.bak
> real    0m30.852s
> user    0m0.020s
> sys    0m2.320s
> CPU (via top): 40% idle, 45% wait
> ----------------------------------------------------------------
> root at pc:/SSHFS/dir# echo 3 > /proc/sys/vm/drop_caches
> root at pc:/SSHFS/dir# time cp ubuntu-12.04.1-desktop-i386.iso \
>                             ubuntu-12.04.1-desktop-i386.iso.bak
> real    0m50.056s
> user    0m0.020s
> sys    0m1.620s
> CPU (via top): 5% idle, 15% wait
> ----------------------------------------------------------------
> root at pc:/NFS/dir# echo 3 > /proc/sys/vm/drop_caches
> root at pc:/NFS/dir# time cp ubuntu-12.04.1-desktop-i386.iso \
>                           ubuntu-12.04.1-desktop-i386.iso.bak
> real    0m34.249s
> user    0m0.000s
> sys    0m1.532s
> CPU (via top): 5% idle, 80% wait
> ================================================================
>
> So that's a 5% drop in performance with bindfs, negligible.
> NFS is pretty light too.
> On the other hand SSHFS (fat clients, localapps...) takes a heavy toll 
> on the server CPU and that reflects on the time needed to perform file 
> operations as well.
>
>
Thanks for a very nice analysis.  (And I only found out about the time 
command as a result of reading this post!)

After installing and configuring bindfs with the upstart method (created 
/etc/init/mount-bindfs.conf), the first reboot was perceptibly slower. 
Initial setup of the overlay I suppose. But after that boot time seemed 
normal once again.

Per one suggestion, I had initially configured with:

     bindfs -o perms=0700,mirror-only=user1:user2 /home/user1/Shared 
/home/user1/Shared

But I found that double-clicking on an AbiWord file prompted an offer to 
run the file as an executable script.

I solved that problem with modified permissions:

     bindfs -o perms=0600,a+X,mirror-only=user1:user2 /home/user1/Shared 
/home/user1/Shared

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