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Posted to server-dev@james.apache.org by Eric Weaver <we...@sigma.net> on 2001/10/16 21:17:24 UTC
Number of SMTP connections in James SMTPServer
I'm looking at using James for a massive number (tens of thousands) of SMTP
connections. I notice that James only accepts about 30 connections to the
SMPTServer at present. Can anybody help me locate where this limitation lies
and give any clues how to scale it up?
I have the recent sources from CVS.
THanks...
--
Eric C. Weaver weav@sigma.net
"Wire telegraph is a kind of a very, very long cat... and radio operates
exactly the same way... the only difference is that there is no cat."
-- Albert Einstein
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Re: Number of SMTP connections in James SMTPServer
Posted by Serge Knystautas <se...@lokitech.com>.
Once you're approach a thousand threads/connections, I'd seriously guess
you're hitting JVM/OS issues. I regularly check
http://www.volano.com/report.html to see how well various JVM/OS's handle
high thread/connection conditions. I'd need to hear what OS and JVM
implementation you're using, and what if any changes you've made to the OS
to support a large number of threads.
With the JDK 1.4 there's support for asynchronous IO, and in theory Avalon
could retool so the # of threads doesn't increase with the number of
connections.
Incidentally, why do you need so many concurrent connections?
Serge Knystautas
Loki Technologies - Unstoppable Websites
http://www.lokitech.com/
----- Original Message -----
From: "Eric Weaver" <we...@sigma.net>
To: <ja...@jakarta.apache.org>
Sent: Tuesday, October 16, 2001 6:05 PM
Subject: Re: Number of SMTP connections in James SMTPServer
> Serge Knystautas wrote:
> >
> > Eric,
> >
> > I'm not sure what the limitation is at this point... what are you using
to
> > simulate that many connections?
>
> My apologies; I have been an idiot.
>
> My preceding tests were done on the released version. I couldnt' make the
> recent version run because (!) I hadn't changed the port numbers in the
config
> file. Running the new version, it handles up to 945 and then chokes and
has to
> be restarted - the threads apparently hang and it won't answer the SMTP
port
> after that.
>
> C10k.pl 4 will try 1000 clients - it opens 10**(n/2) connections.
>
> Any more thoughts?
>
> --
> Eric C. Weaver weav@sigma.net
> "Wire telegraph is a kind of a very, very long cat... and radio operates
> exactly the same way... the only difference is that there is no cat."
> -- Albert Einstein
>
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>
>
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Re: Number of SMTP connections in James SMTPServer
Posted by Oki DZ <ok...@pindad.com>.
On Tue, 16 Oct 2001, Eric Weaver wrote:
...
> file. Running the new version, it handles up to 945 and then chokes and
> has to be restarted - the threads apparently hang and it won't answer
> the SMTP port after that.
Have you tried to tune the JVM?
Maybe it's just a matter of having a larger heap/stack space.
Oki
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Re: Number of SMTP connections in James SMTPServer
Posted by Eric Weaver <we...@sigma.net>.
Serge Knystautas wrote:
>
> Eric,
>
> I'm not sure what the limitation is at this point... what are you using to
> simulate that many connections?
My apologies; I have been an idiot.
My preceding tests were done on the released version. I couldnt' make the
recent version run because (!) I hadn't changed the port numbers in the config
file. Running the new version, it handles up to 945 and then chokes and has to
be restarted - the threads apparently hang and it won't answer the SMTP port
after that.
C10k.pl 4 will try 1000 clients - it opens 10**(n/2) connections.
Any more thoughts?
--
Eric C. Weaver weav@sigma.net
"Wire telegraph is a kind of a very, very long cat... and radio operates
exactly the same way... the only difference is that there is no cat."
-- Albert Einstein
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Re: Number of SMTP connections in James SMTPServer
Posted by Serge Knystautas <se...@lokitech.com>.
Eric,
I'm not sure what the limitation is at this point... what are you using to
simulate that many connections? If it's Java code, can you submit it so I
can add it to our testing directory and try it myself? Or if it's a tool I
can try for free, I'd like to explore the limitation.
Serge Knystautas
Loki Technologies - Unstoppable Websites
http://www.lokitech.com/
----- Original Message -----
From: "Eric Weaver" <we...@sigma.net>
To: <ja...@jakarta.apache.org>
Sent: Tuesday, October 16, 2001 3:17 PM
Subject: Number of SMTP connections in James SMTPServer
>
> I'm looking at using James for a massive number (tens of thousands) of
SMTP
> connections. I notice that James only accepts about 30 connections to the
> SMPTServer at present. Can anybody help me locate where this limitation
lies
> and give any clues how to scale it up?
>
> I have the recent sources from CVS.
>
> THanks...
>
> --
> Eric C. Weaver weav@sigma.net
> "Wire telegraph is a kind of a very, very long cat... and radio operates
> exactly the same way... the only difference is that there is no cat."
> -- Albert Einstein
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RE: Number of SMTP connections in James SMTPServer
Posted by Danny Angus <da...@thought.co.uk>.
Have you tried the thread manager conf at the bottom of
dist/apps/james/conf/config.xml, and the spool threads at the top?
> -----Original Message-----
> From: weav@WhoWhere.Com [mailto:weav@WhoWhere.Com]On Behalf Of Eric
> Weaver
> Subject: Number of SMTP connections in James SMTPServer
> I notice that James only accepts about 30 connections to the
> SMPTServer at present. Can anybody help me locate where this
> limitation lies
> and give any clues how to scale it up?
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