[zeromq-dev] Context ioThreads

Gary Davidson Gary.Davidson at interclick.com
Wed Aug 24 14:50:12 CEST 2011

So far 1 has worked but saturated a 100 meg card, I am working with Amazon to increase this. In production we have 1 Gig, FCOE and 10gigE. I do not have Dev environment to match this however I think I will be ok.

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Gary Davidson, Chief Software Architect
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From: zeromq-dev-bounces at lists.zeromq.org [mailto:zeromq-dev-bounces at lists.zeromq.org] On Behalf Of Ian Barber
Sent: Wednesday, August 24, 2011 2:14 AM
To: ZeroMQ development list
Subject: Re: [zeromq-dev] Context ioThreads

On Wed, Aug 24, 2011 at 7:09 AM, Martin Sustrik <sustrik at 250bpm.com<mailto:sustrik at 250bpm.com>> wrote:
On 08/24/2011 08:01 AM, Steven McCoy wrote:

> Doesn't sound useful on 10GigE adapters though.
More interesting metric would be I/O threads per open TCP connections.

However, I guess the number is going to vary significantly. The only
useful rule of thumb is "at most N I/O threads where N is number of CPU
cores on the box".


True and true. In general, could we say:

1. Most people will not need to modify the number of IO threads
2. At most there should be N I/O threads where N is the number of CPU cores on teh box
3. If you are managing a large (> ?) number of connections or amount of traffic ( > 1gb/s) then it may be worth experimenting with more than 1 IO thread.

Is there anything PGM specific we should add?

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