Re: Max of two connections per client?

[Peter Johnson]

Joe,
What I am saying is that from memory I believe that it is a 
specification of the HTTP protocol that no more than two concurrent 
connections are opened to any one host. The purpose is to limit the 
potential load on the server and it's network socket pool.

I.e. Given a server has about 65000 free sockets at it's disposal and 
someone poorly designed a page which had 100 images and the server came 
under the Slashdot effect of >650 concurrent users then the server would 
exhaust all it's available sockets if each browser was allowed to make a 
connection per image.
(Yes: these figures are rough as no CSS or HTML content requests have 
been taken into account and a page with 100 images is quite unlikely)

However, I could be going down completely the wrong path here. You might 
want to do a little research on it yourself.

PJ
Hunt, Joseph (OVBU- Ft.Collins) wrote:
PJ,
        I'm not sure what you are suggesting, but I did try turning off
HTTP 1.1 in IE and still get the same behavior.
Thanks,
Joe Hunt 

 

-----Original Message-----
From: Peter Johnson [mailto:[EMAIL PROTECTED] 
Sent: Tuesday, January 11, 2005 2:48 PM
To: Tomcat Users List
Subject: Re: Max of two connections per client?

I think that is HTTP/1.1 for you ... but the details are a 
little foggy

PJ
Hunt, Joseph (OVBU- Ft.Collins) wrote:
   

Ladies and Gentlemen,
	I have created an html document that contains several 
     

<Iframe>s that 
   

all refer to the same JSP page.  The JSP simply
waits(Thread.sleep()) 5 seconds and then returns some text.  When I 
open the html document in either IE or Mozilla after 5 seconds I see 
the first two iframes load, then 5 seconds later, I see the 
     

next two, etc.
   

	I am using the default config params on tomcat 5.0.28 
     

on Win XP Pro.  
   

If I understand them correctly, I should have between 25
(minSpareThreads) and 150(maxSpareTreads) threads available.  Why do 
the requests wait for the previous to complete as if there 
     

are only two 
   

threads handling the requests?
	In my research, I have noticed that connecting from 
     

other machines, I 
   

get two concurrent requests per machine.  For example, if I open the 
html page on three machines simultaneously, it appears that I have 6 
threads in tomcat working.  But I am always restricted to two 
concurrent requests per client.  I have also noticed that if 
     

I use both 
   

IE and Mozilla on the same machine, I am able to get at most 4 
consecutive requests.  Again 2 requests from each browser.  
     

If I open 3 
   

IE browsers on the same machine I see the updates happen two 
     

at a time 
   

across all the browsers.
	Is there some piece of configuration that I am missing? 
     

Where is this 
   

two concurrent requests coming from?
BTW it does not appear to be the browser that is dispatching 
     

only two 
   

requests.  I can add any number of additional Iframes pointing to 
non-tomcat sites and they seem to begin loading immediately.

Thanks,
Joe Hunt
HP OpenView
(970)898-6402
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