[zeromq-dev] Is the ZMQ_IO_THREADS option implemented ?

Lindley French lindleyf at gmail.com
Tue Feb 18 17:40:42 CET 2014


It's possible the CPU isn't the bottleneck here?


On Tue, Feb 18, 2014 at 7:26 AM, Laurent Alebarde <l.alebarde at free.fr>wrote:

>  Hi Devs,
>
> Here are some tests on a 8 cores cpu.
> 500 client sockets sending 100 requests each with CURVE.
> The duration measured takes into account only the exchange phase (not the
> preparation like sockets creation, bind, connect).
> Clients sockets are polled and a new request is sent as soon as the
> previous one is back.
>
> Same ctx for client (1 thread, 500 sockets), workers (6 threads, 200
> sockets each), proxy (1 thread)
>
> I/O threads    Test duration (us)
> 1        58,220,570
> 2        62,541,507
> 3        61,411,154
> 4        58,612,643
> 5        58,752,070
> 6        53,754,941
> 7        56,311,634
> 8
> 9
> 10        58,363,975
> 20        53,909,971    52,686,884    53,027,835
> 40        56,675,445    54,128,019    54,111,137
> 100        52,951,096    53,056,814    53,100,007
> 1,000        53,791,720
>
>
> Separate ctx for client, workers, and proxy (and so different number of
> I/O threads for each):
>
> I/O threads    Test duration (us)
> 3/3/3        55,137,176    56,334,984    53,901,536
>
> All these figures are roughly the sames. Other than this test, my computer
> is quite idle, nothing stressing the cpu is running. The cpu graph is flat
> before running the test. When I run the test, I can see only one cpu
> significantly used, but I am not sure such graph is relevant.
>
> Furthermore, in the libzmq tests, there is no performance test that
> demonstrates the ZMQ_IO_THREADS option works. There is only
> tests/test_ctx_options.cpp that shows you can set the option, and
> tests/test_shutdown_stress.cpp that sets 7 I/O threads, but it does not
> demonstrate performances gains.
>
> This makes me raise the question: has someone used this ZMQ_IO_THREADS
> option succesfully ?
>
> All the test were run with the release build from Eclipse CDT. When run in
> a console directly, I can see a gain of 30%, but that's still far from what
> is expected.
>
> Cheers,
>
>
> Laurent
>
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