[zeromq-dev] taskvent/taskwork2/tasksink2 performance degredation

John D. Mitchell jdmitchell at gmail.com
Wed May 18 08:43:21 CEST 2011

On May 17, 2011, at 23:17 , Martin Sustrik wrote:

> On 05/18/2011 01:36 AM, John D. Mitchell wrote:
>> Howdy, just installed latest zeromq from git (2.1.7) on OS X 10.6.7.
>> This is a 2011 MBP with lots of free RAM and an SSD. Running into few
>> problems that don't seem to show up in irc or mailing list logs...
> Such decrease in performance is often seen when OS starts swapping. Can that be the case?

Doesn't seem to be the case here. It's an 8GB RAM box and I've run the tests when it has anywhere between 2GB and ~6GB free and there doesn't seem to be any noticeable change.

I've also run it after rebooting, reset limits, etc. to higher values (as per the tuning page), and now I'm getting a more widely varied behavior than before. I.e., some runs it will complete at what looks to be full speed and other runs will have the slow down (but not as drastic as earlier ~2 secs to ~9.5 seconds).

>> Ian wrote: 
> Is it possible there are old sockets still handing around from previous runs when you do the later ones?

I've run the tests quite a few times now with different numbers of workers, etc. and with variety of pauses between tests. I haven't noticed any oddly lingering sockets. All of the workers and the ventilator and sink all exit correctly -- just the performance oddity.


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