Skip site navigation (1)Skip section navigation (2)
Date:      Mon, 27 Feb 2017 09:36:56 +0800
From:      Sepherosa Ziehau <sepherosa@gmail.com>
To:        Slawa Olhovchenkov <slw@zxy.spb.ru>
Cc:        "freebsd-net@freebsd.org" <net@freebsd.org>
Subject:   Re: listening sockets as non sockets
Message-ID:  <CAMOc5cyVKkGMPm840DG7m0eiMjkshzjAvxMgQzPvR0VjQnh4Gg@mail.gmail.com>
In-Reply-To: <20170225155628.GB6035@zxy.spb.ru>
References:  <20170127005251.GM2611@FreeBSD.org> <20170210063024.GE1973@FreeBSD.org> <20170216184903.GF58829@FreeBSD.org> <0858647a-ec3c-1a78-053f-d04397a82d8a@freebsd.org> <20170222232704.GJ8899@FreeBSD.org> <CAMOc5cw7fkrS6LVCwo1hXY459O9p5VdgyfcE4Apkc-kAgQWu7A@mail.gmail.com> <20170223153636.GI15630@zxy.spb.ru> <20170224131349.GJ15630@zxy.spb.ru> <CAMOc5cwcMtHr15dQdaC1DARH2HUXSdHgHA2LOJH-J0YEZk7gww@mail.gmail.com> <20170225155628.GB6035@zxy.spb.ru>

next in thread | previous in thread | raw e-mail | index | archive | help
On Sat, Feb 25, 2017 at 11:56 PM, Slawa Olhovchenkov <slw@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.

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



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAMOc5cyVKkGMPm840DG7m0eiMjkshzjAvxMgQzPvR0VjQnh4Gg>