[zeromq-dev] Odd numbers with zeromq

Andrew Hume andrew at research.att.com
Wed Sep 19 05:26:21 CEST 2012


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> 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> wrote:
> Hi Maninder,
> 
> On Tue, Sep 18, 2012 at 10:21 PM, Maninder Batth
> <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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> 
> 
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Andrew Hume  (best -> Telework) +1 623-551-2845
andrew at research.att.com  (Work) +1 973-236-2014
AT&T Labs - Research; member of USENIX and LOPSA




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