[zeromq-dev] Odd numbers with zeromq

Christian Martinez chmar at microsoft.com
Wed Sep 19 19:25:31 CEST 2012


Maybe I'm missing something here, but are people asserting here that one can't do a request reply MEP with various RPC technologies and exceed 1000 1KB messages a second?

--CM

From: zeromq-dev-bounces at lists.zeromq.org [mailto:zeromq-dev-bounces at lists.zeromq.org] On Behalf Of Andrew Hume
Sent: Tuesday, September 18, 2012 10:03 PM
To: ZeroMQ development list
Subject: Re: [zeromq-dev] Odd numbers with zeromq

excessive?
you are going from a scheme where packets go out in bulk asynchronously,
to a scheme where a single packet goes out, a process needs to woken up,
processes a single packet, and then send a single packet, and then wake up the sending process.
i think you're lucky to get 1k/s.

a. no. it seems silly from a programming perspective.

b. if you want efficiency, then do bulk asynchronous acknowledgements via another socket.

On Sep 18, 2012, at 9:57 PM, Maninder Batth wrote:


A difference of 110K to 1k a second seems excessive. But i am not saying it is wrong or right. I am just wondering

a. Am i doing something silly from api usage perspective

b. If someone has similar experience, (one way burst, vs send, recieve ack and then send next message), maybe they can share their numbers or validate similar behavior.

On Tue, Sep 18, 2012 at 10:26 PM, Andrew Hume <andrew at research.att.com<mailto:andrew at research.att.com>> wrote:
why would you expect different?
REQ/REP involves a synchronous repsonse so there is no opportunity to do anything fast.

On Sep 18, 2012, at 8:21 PM, Maninder Batth wrote:

Paul,
With messages being sent one way, via pub and sub sockets, i am getting a very decent performance. About 80% of our network gets saturated.
The code is zserver.cpp and zclient.cpp

But if i configure the software such that client only sends the next message, after it has received a response from the server, the throughput  is really bad.
The code is zserver-ack1.cpp  and zclient-ack1.cpp
The difference is that in the former case, i can get 110k messages per second , whereas in the latter case,  i can only get 1k messages per second.
The sockets that i use in latter case are of type REQ and REP. Am i using wrong sockets type ?


On Tue, Sep 18, 2012 at 9:38 PM, Maninder Batth <whatpuzzlesme at gmail.com<mailto:whatpuzzlesme at gmail.com>> wrote:
Paul,
Thank you again for your help. Now with message copying, i am getting a throughput of .8Gb, which is what i would have expected on a 1Gb network.

On Tue, Sep 18, 2012 at 4:20 PM, Paul Colomiets <paul at colomiets.name<mailto:paul at colomiets.name>> wrote:
Hi Maninder,

On Tue, Sep 18, 2012 at 10:21 PM, Maninder Batth
<whatpuzzlesme at gmail.com<mailto:whatpuzzlesme at gmail.com>> wrote:
> Paul,
> Here is number of messages as seen by the server in one second. Each message
> is 1024 byte excluding tcp/ip and zmq headers. Based on these numbers and i
> am getting a throughput of 1.4 Gb/sec.
> Enclosed is the source code for the server and the client.
>
Zeromq closes the message after sending. So you effectively send
messages of the zero length after first one. You should use
zmq_msg_copy (or whatever C++ API is there) before  doing send() in
case you want to reuse message.

--
Paul
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AT&T Labs - Research; member of USENIX and LOPSA




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