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From Peter Lin <wool...@gmail.com>
Subject Re: How many connections can be made to Tomcat on Windows?
Date Wed, 15 Sep 2004 13:35:28 GMT
are you using a single system as the client or multiple?  I've been
able to simulate upward of 100 threads in jmeter against tomcat for a
static file using my Gateway laptop which is a 1.4ghz PentiumM with
1Gb RAM. beyond 100 threads, the throughput tends to go down. I don't
remember the exact settings I used, but it was roughly

max 150
min 100
spare 50

since your webpage hits the database, I would suggest using JMeter to
test your database first and figure out the peak queries/second.  Even
if you have 4 tomcat servers on the front end, if your database can
only handle 400 queries/sec, it only going to kill the database. at
that point, tomcat is just tell the user internal server error.

I hope that helps

peter


On Wed, 15 Sep 2004 11:11:07 +0200, Jorge Sopena <jsopena@sidsa.es> wrote:
> 
> My case is teh first one, there will be peaks of requests.
> I mean it's quite likely that in any moment I could receive this
> quantity of requests.
> For example, I very likely scenario is to receive in 2-3 minutes around
> 100000 requests, what is in average 500req/second
> 
> I know I will need more hardware for the final environment.
> But my current problem is that I can't get connections with Tomcat in a
> quickly way unless I send them separately.
> I can send 15 requests concurrently, then I get
> java.net.ConnectionException.
> I knew I wouldn´t reach my goal in my machine (Pentimu IV, 2.4GHz,
> 512MB) but I find the results very poor.
> 
> So I wondered if Tomcat can reach to this numbers in another environment?
> 
> Thanks
> 
> Jorge
> 
> 
> 
> 
> Elmar Haneke wrote:
> 
> >> Thanks for the calculations, but more exactly I want the server to
> >>  attend 1000 requests/second. I mean I don't want any of those
> >> requests to be rejected. It's probably the response time were
> >> several seconds, but with better hardware I could manage that.
> >
> >
> > Is it your intention to handle the (perhaps rare) case where 1000
> > requests are coming within the same second or are you planning to
> > manage 1000 Requests every second (60000 requests per minute)?
> >
> > In the second case it won't help if each request remains active
> > several seconds - this would cause to have several thousand
> > connections open simultaneously - an very hard job for any kernel.
> >
> > Elmar
> >
> > ---------------------------------------------------------------------
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> >
> 
> --
> ==============================================================
> Jorge Sopena Torres
> SIDSA
> (Semiconductores Investigación y Diseño, S.A.)
> 
> Parque Tecnológico de Madrid
> c/ Torres Quevedo, nº 1
> 28760 TRES CANTOS (Madrid) (SPAIN)
> 
> Phone : +34 91 803 5052
> Fax:    +34 91 803 9557
> 
> e-mail: jsopena@sidsa.es
> URL: http://www.sidsa.com
> 
> ==============================================================
> 
> 
> 
> 
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