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From gou...@osmosis.gr
Subject Re: AW: Cocoon performance results
Date Tue, 27 Jan 2004 11:34:14 GMT

btw 

for a typical system (server) with 1Gbyte ram
which are the perfect settings?

or there is not one-only answer ?

if here are people that have setup production servers at the  past it will 
be good to publish some configuration as examples for other people 

we use the default values because we dont know what will hapned otherwise



--stavros


On Tue, 27 Jan 2004, Vadim Gritsenko wrote:

> Rottmann, Lars wrote:
> 
> >Hi Vadim,
> >
> >sorry, I don't see it. Where is the problem if I set the JVM memory to 2536M
> >= 2,536,000,000 and heapsize and freememory to 80,000,000 and 20,000,000?
> >Can you give me a hint?
> >  
> >
> 
> http://cvs.apache.org/viewcvs.cgi/cocoon-2.1/src/webapp/WEB-INF/cocoon.xconf?rev=1.36&view=auto
> 
>   <!--+
>       | Store Janitor: the store garbage collector and memory usage controller.
>       |
>       | WARNING: Be careful with the heapsize and freememory parameters.
>       |           Wrong values can cause high cpu usage.
>       |
>       | Example configuration:
>       | Jvm settings:
>       |    -Xmx200000000
>       | store-janitor settings:
>       |    <parameter name="freememory" value="5000000"/>
>       |    <parameter name="heapsize" value="196000000"/>
>       |
>       | It is recommended to have heapsize equal to -Xmx, especially on Sun's
>       | JVM which are unable to shrink its heap once it grows above minimum.
>       | Freememory should be greater than amount of memory necessary for normal
>       | application operation.
>       | BUT: The heap size of the memory of the JVM is a little bit less than
>       |      the value you specify for -Xmx, so you have to set the heapsize
>       |      for the store janitor to a value which is lower (2% less seems
>       |      to be a working value).
>       +-->
> 
> 
> 
> It advises to have heapsize set to the -Xmx value. In your particular 
> situation (-Xms has same vaue as -Xmx) it might not cause any problem, 
> but I it is not generally advised to have conflicting values.
> 
> Actually, it is more hazardous to specify heapsize which is just one 
> byte more than really possible heapsize - this could turn off janitor.
> 
> Vadim
> 
> 
> >Lars
> >
> >
> >-----Urspr¤îngliche Nachricht-----
> >Von: Vadim Gritsenko [mailto:vadim@reverycodes.com] 
> >
> >You know that you've got conflicting settings, right?
> >
> > From the page:
> >    -Xms2536M -Xmx2536M
> >    store-janitor's /heapsize/ set to 80,000,000, /freememory/ set to 
> >20,000,000 (cocoon.xconf)
> >
> >
> >Vadim
> >  
> >
> 
> 


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