Memory

["Aigner, Thomas" <TA...@WescoDist.com>]

Hi all,
	Is anyone experiencing possible memory problems on LINUX with
Lucene search?  Here is our scenario, we have a service that lives on
LINUX that takes all incoming request through a port and does the
search.  Only 1 IndexSearcher is instantiated to do this from our
service.  When I run a ps and grep for java it shows only 1 java process
running.. however, when 4 users log into our program and start to search
at the same time, 4 java processes show up on TOP (and I can't see their
parent PID from the top command), but still only 1 java on ps.  
	My company fears that each process is being allocated 128M
memory and is running the box out of memory (when the service is started
we allocated 10 - 128M from the java call).  I am still in the process
of testing with our system guys and having the data analyzed with a 3rd
party, but was curious as to your findings..

Thanks ahead of time,
Tom  

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Re: Memory

[Paul Smith <ps...@aconex.com>]

If you look at the man page for 'ps' you'll see a switch that shows  
all the threads too (it's different on different unix flavours, so  
best to do look in the man page).

Once you've shown the threads in 'ps' you'll see that the process  
that is appearing in top, and I'll bet it's parent is your original  
java process.

I wouldn't panic, each thread is almost certainly sharing the same  
memory pool, so while top reports that the thread has X Mb of memory,  
it's really the same physical block as all the others.

You see this all the time in a Tomcat app server box, where each Http  
Connector is a thread, and appears as it's own process.

cheers,

Paul Smith

On 17/01/2006, at 7:11 AM, Aigner, Thomas wrote:

>
> Hi all,
> 	Is anyone experiencing possible memory problems on LINUX with
> Lucene search?  Here is our scenario, we have a service that lives on
> LINUX that takes all incoming request through a port and does the
> search.  Only 1 IndexSearcher is instantiated to do this from our
> service.  When I run a ps and grep for java it shows only 1 java  
> process
> running.. however, when 4 users log into our program and start to  
> search
> at the same time, 4 java processes show up on TOP (and I can't see  
> their
> parent PID from the top command), but still only 1 java on ps.
> 	My company fears that each process is being allocated 128M
> memory and is running the box out of memory (when the service is  
> started
> we allocated 10 - 128M from the java call).  I am still in the process
> of testing with our system guys and having the data analyzed with a  
> 3rd
> party, but was curious as to your findings..
>
> Thanks ahead of time,
> Tom
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
>


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