[Icecast-dev] icecast relay server performance testing

Popov, Zahar
Fri, 10 Jun 2016 05:28:37 -0000

Hi Alejandro,
Many thanks for your message.

I changed it to 4 (i have 4 cores), but it didn’t really help. I see that all 4
cores are now working, but the connections are still being dropped.

Which VM type are you using? Or it’s not running on AWS?

thanks!
—zahar

> On Jun 10, 2016, at 1:29 PM, Alejandro <cdgraff at gmail.com> wrote:
>
> Sorry, 35K concurrent with 8 workers at 60% cpu
>
> 2016-06-10 1:28 GMT-03:00 Alejandro <cdgraff at gmail.com
<mailto:cdgraff at gmail.com>>:
> Hi Zahar, what value has into
>
>     <workers>8</workers>
>
> This value is recommended to set at 1 by virtual core.
>
> I 'm using for some years, KH branch with 35 concurrent listeners into
8 core vm.
>
> Regards,
> Alejandro
>
> 2016-06-10 0:50 GMT-03:00 Zahar Popov <zahar.popov1978 at yandex.com
<mailto:zahar.popov1978 at yandex.com>>:
> Hello
> I'm trying to measure the performance of the icecast relay server on
64kbps streams.
>
> The server is running in AWS (i've tried various instance types) and
the test clients are running on other machines in AWS. The test client is a very
simple libuv application that sends a GET request and basically ignores
everything it receives in the response. I'm using the icecast-kh fork.
>
> I'm able to go up to around 9K simultaneous connections to the server
(from two machines). The CPU usage is low, about 15% or so (on one core).
However connections are starting to be dropped. Checking netstat i see many
frames being lost. Increasing the transmit queue length helped, but still i
can't go beyond around 9K connections. I have increased the file descriptor
limits and configured IRQ balancing (even though the problem doesn't seem to
be CPU bound)
>
> It doesn't matter if i run one or more instances of the relay server,
the limit seems to be OS global so when one instance is running with 5K
connections and the other instance is getting close to 4K connections they both
start dropping connections.
>
> I assume that there is some other setting of the stack that i didn't
configure so i was wondering if anybody was able to run a few dozens of
thousands of connections on one server.
>
> thanks!
> --zahar
>
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