[zeromq-dev] CPU load while polling 0mq sockets

Joshua Foster jhawk28 at gmail.com
Fri Feb 3 23:01:22 CET 2012

Polling is supposed to be a non-busy wait so there should not be any CPU 
usage while waiting on the sockets. I know this works on the Java version.


On 2/3/2012 4:25 PM, Sergey Malov wrote:
> I've checked it with different version of Scala 0mq binding, and it behaves as expected: setting polling time to 0.5sec decrease CPU usage to almost zero.
> It seems version I used before (0.0.4) has a polling bug.
> On 2012-02-03, at 2:40 PM, Chuck Remes wrote:
>> On Feb 3, 2012, at 1:36 PM, Sergey Malov wrote:
>>> Hi,
>>> I have an application using three different 0mq socket types:
>>> - PULL, to receive protocol buffer messages from outside for further processing,
>>> - PUB, to publish results (in protocol buffer format as well)
>>> - REPLY, to occasionally answer on status query, etc
>>> All sockets are being polled in single cycle. It's a Scala application, using scala zeromq binding, and 2.1.11 0mq library.
>>> What I observe, being idle this app still utilizes more than 100-120% CPU on 4-cores linux box (using top utility). Under "idle" I mean that it is started and polling sockets, but notching is there to pull/publish.
>>> I played with setting timeout (using setTimeout on poller), latest I've set was to 2000000 microseconds, with no obvious effect on CPU usage. I know that most of the time it spends polling, since I monitor it with profiler.
>>> Is it normal, such a high CPU utilization? Is there anything wrong with what I'm doing? Something I should check/set ?
>> Try setting the timeout period to 1 second. If you still see high CPU then it's likely a bug in the Scala or Java binding. With a 1s timeout, cpu utilization should be 0.
>> cr
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