listening sockets as non sockets

[Sepherosa Ziehau]

On Mon, Feb 27, 2017 at 9:36 AM, Sepherosa Ziehau <sepherosa at gmail.com> wrote:
> On Sat, Feb 25, 2017 at 11:56 PM, Slawa Olhovchenkov <slw at zxy.spb.ru> wrote:
>> On Sat, Feb 25, 2017 at 11:09:29PM +0800, Sepherosa Ziehau wrote:
>>
>>> > Can I use per-connection Lua script (for delays and url generation)?
>>> > Not per-thread. I am need to emulate many client connections (about
>>> > 10K-40K).
>>> > Currently I am have some trouble w/ >20K connections.
>>>
>>> I didn't try the Lua script.  Make sure to low the MSL on the box
>>> running wrk, e.g. 10ms.  Well, I'd recommend you to run 15K concurrent
>>> connections on one testing box.
>>
>> Thanks!
>> Can you explain some more this recomendations?
>
> If you don't lower MSL, too many sockets will sit in TIMED_WAIT state
> on the testing client, which consumes local port space.  Local port
> space depletion == wrk can do more requests.

Hmm, I meant 'wrk cannot do more requests' :)

>
> 15K concurrent connection on each client box is a heuristic to make
> sure local ports can be recycled timely.  You need to figure out your
> value on the testing box.  But, normally, 15K ~ 10K is doable on each
> client machine for a given server.
>
>>
>> PS: I am run wrk w/ '--connreqs 600'
>
> Well, nginx's default setting is 100 requests/connection :).  I use
> --connreqs 1 to generate "short-lived" connection bomb.
>
> Thanks,
> sephe
>
> --
> Tomorrow Will Never Die



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Tomorrow Will Never Die