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@pc:/NORMAL/dir# echo 3 > /proc/sys/vm/drop_caches
root@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@pc:/BINDFS/dir# echo 3 > /proc/sys/vm/drop_caches
root@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@pc:/SSHFS/dir# echo 3 > /proc/sys/vm/drop_caches
root@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@pc:/NFS/dir# echo 3 > /proc/sys/vm/drop_caches
root@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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