RE: [Javaserver-perl] Re: JavaServer dies when under heavy load

[Shao M. <sha...@si...>]

Was looking round for JVM for linux and bump into this benchmarking report.
http://www.volano.com/report/index.html 
I was using blackdown 1.4.2. It seem that 1.4.x series seem to have network
scability performance issues. I believe the JavaServer falls under this
category, right? Can't recall whether it was actually using loopback. The
blackdown 1.3.x seem to have better performance.
/shaoming

-----Original Message-----
From: ma...@zz... [mailto:ma...@zz...] 
Sent: Tuesday, July 20, 2004 8:18 AM
To: Shao Ming
Cc: jav...@li...
Subject: Re: [Javaserver-perl] Re: JavaServer dies when under heavy load

Even if you don't need the stuff added in 1.4.x there were many bugfixes &
speed enhancements (& more of that in upcoming 1.5 whatever-the-heck it's
gonna be called)...
So unless you REALLY don't want to upgrade using 1.4.x is optimal.
    Mark

On Tue, Jul 20, 2004 at 08:13:39AM +0800, Shao Ming wrote:
>  
> Hi to all,
> 
> Haven't had time to troubleshoot the issue, will be doing in the next 
> few days.
> But one quick question came to mind, what are the preferred JVM you 
> guys are using for your linux box? And if I do not need the Java2 
> features ... Is 1.3.x series a better choice than 1.4.x?
> 
> Cheers!
> /shaoming
> 
> -----Original Message-----
> From: jav...@li...
> [mailto:jav...@li...] On Behalf Of 
> ma...@zz...
> Sent: Tuesday, July 13, 2004 12:21 PM
> To: Shao Ming
> Cc: jav...@li...
> Subject: [Javaserver-perl] Re: JavaServer dies when under heavy load
> 
> Hey Shao,
>     I would recommend running JavaServer under a profiler or debugger 
> to see better what's going on.  Does the JVM crash?  Does JavaServer 
> hang?  Is there a stack trace?
>     Of course you can create a simple shell watchdog script to restart 
> JavaServer if it goes away but better to find out the root cause - I 
> cannot think of a reason why JavaServer would crash under heavy load 
> from 24 users unless there's a memory leak or you run out of system
resources somewhere.
> Of course there could be a JVM bug or any number of things that causes
this.
>     & please write to the list 'jav...@li...'
> so everyone can benefit from this discussion - join @ 
> http://sourceforge.net/projects/javaserver/
>     thanks!
> 	Mark
> 
> On Tue, Jul 13, 2004 at 11:14:58AM +0800, Shao Ming wrote:
> > Hi Mark,
> >  
> > first of all, thanks again for the fine piece of work.
> >  
> > During our Performance testing, we discover that JavaServer will die 
> > under heavy load (when we simulate abt 24 virtual users).
> >  
> > Do you know of any particluar reason why JavaServer cannot handle 
> > the
> load?
> > Or alternatively, do you know of any 3rd party app that can monitor 
> > running instance of JavaServer and restart the daemon when its down?
> >  
> > this is just the last hurdle I need to rectify before rolling out 
> > the app for production.
> >  
> > thanks for your attention.
> >  
> > regards,
> > /shaoming
> 
> 
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