On March 6, 2015 11:32:01 PM Tom van der Woerdt info@tvdw.eu wrote:
Hi Tom,
Sebastian Urbach schreef op 06/03/15 om 21:52:
Dear list members,
I hope that some of you compared 0.2.5.10 with 0.2.6.x regarding the performance (ticket 9682). How big/small is the difference in the wild ? I would appreciate it if someone with Linux / BSD could say a few words ;-)
Hi Sebastian,
As far as I can tell the change happened between 0.2.6.2 and 0.2.6.3 so I'll describe the performance difference between those.
You're right, got 0.2.5.10 stuck in my head because it's the last stable release ;-) The patch came up with 0.2.6.3, indeed.
Just had a look on a server of mine that is bottlenecked by the CPU. I noticed that there was indeed a big drop in CPU usage. However, there was also a similar drop in network usage, most likely caused by the restart. It took about a week to fully recover to normal levels.
It is incredibly hard to tell from the data whether there was a big performance difference as a direct result of the 0.2.6.2->0.2.6.3 upgrade. It's definitely not going to be a 10% improvement, as far as I can tell.
Hard to tell pretty much says it all :-( Not much of a change. Now the multithread feature becomes the last hope :-)
Despite my nodes all running with 'NumCPUs 2', none of the worker queues seem to be doing much :
$ ps H -o etime,time,args -u toranon | grep node2 3-01:46:17 1-20:35:33 /usr/bin/tor -f /etc/tor/torrc-node2 3-01:46:13 00:17:09 /usr/bin/tor -f /etc/tor/torrc-node2 3-01:46:13 00:17:09 /usr/bin/tor -f /etc/tor/torrc-node2
If those threads are what the patch addressed, I'm afraid it's not going to have a massive impact.
In case it's relevant: these measurements are taken from an exit relay with two processes each doing ~150Mbit/s (x2 if you count up+down).
Upgrade was done at 2015-02-24 21:26, relevant graphs : * cpu: http://www.imgdumper.nl/uploads8/54fa2a823bc62/54fa2a823434f-cpu.png * network: http://www.imgdumper.nl/uploads8/54fa2a8ce3db5/54fa2a8cdd05c-if_eth1.png
Thanks gor your reply, domehow i expected it zo be more of a boost after reading Nick's text:
https://blog.torproject.org/blog/coming-tor-026