[zeromq-dev] 10 seconds delay on a PUB/SUB

Doron Somech somdoron at gmail.com
Fri Mar 14 18:31:28 CET 2014


Also what is latency between client and server? Can you make code that
reproduce?
On Mar 14, 2014 5:17 PM, "Pieter Hintjens" <ph at imatix.com> wrote:

> How large are these messages, and how many clients do you actually have?
>
> On Fri, Mar 14, 2014 at 4:06 PM, Giacomo Tesio <giacomo at tesio.it> wrote:
> > Hi, I'm getting 5 to 10 seconds delay in on a pub/sub socket with low
> load
> > (in a context with heavy load on other sockets).
> >
> > I'm using NetMQ on Windows 7, with tcp transport on 127.0.0.1 (indeed it
> > should be ipc, but it's not supported on Windows AFAIK).
> >
> > This is the topology:
> >
> > We have Server A, Client B and Client C.
> >
> > Server binds a PUB with heavy load (let's call it PUB1), publishing
> 50-100
> > msg/s with few daily peaks at 1000 msg/s.
> >
> > Server binds a PUB with small load (let's call it PUB2). publishing
> 50-500
> > msg each day. Note however that these messages are sent in groups of 1
> to 5
> > in a few milliseconds.
> >
> > Client B connect with a SUB socket to PUB1,
> > Client C connects with two SUB socket to PUB1 and PUB2.
> >
> > My issue is that when a group of messages is sent in PUB2, the first is
> > received almost instantly from Client C, but the others are received
> seconds
> > after, at seconds of distances.
> >
> > For example, here are a few times from today problems.
> >
> > Sent from Server A  -> Received from Client C
> > 09:00:59.608 -> 09:01:05.643
> > 09:01:00.055 -> 09:01:05.64
> > 09:01:00.117 -> 09:01:10.928
> > 09:01:02.883 -> 09:01:16.172
> > 09:01:05.541 -> 09:01:18.754
> >
> >
> > How can I reduce this delay?
> > I tried to increase the ThreadPoolSize up to the number of CPUs, but
> without
> > success.
> > Note that I (must) have HighWaterMark = 0 on every socket (I can't loose
> > messages), but the machine is full of free memory (4 GB are always free)
> and
> > never use more than 40% of each cpu.
> >
> >
> > Giacomo
> >
> >
> > _______________________________________________
> > zeromq-dev mailing list
> > zeromq-dev at lists.zeromq.org
> > http://lists.zeromq.org/mailman/listinfo/zeromq-dev
> >
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