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From "Lance Norskog" <>
Subject RE: Help optimizing
Date Tue, 06 May 2008 17:26:28 GMT
One cause of out-of-memory is multiple simultaneous requests. If you limit
the query stream to one or two simultaneous requests, you might fix this.
No, Solr does not have an option for this. The servlet containers have
controls for this that you have to dig very deep to find.

Lance Norskog 

-----Original Message-----
From: Grant Ingersoll [] 
Sent: Tuesday, May 06, 2008 5:19 AM
Subject: Re: Help optimizing

On May 3, 2008, at 1:06 PM, Daniel Andersson wrote:

> Hi (again) people
> We've now invested in a server with 8 GB of RAM after too many 
> OutOfMemory-errors.
> Our database/index is 3.5 GB and contains 4,352,471 documents. Most 
> documents are less than 1 kb. When performing a search, the results 
> vary between 1.5 seconds up to 60 seconds.
> I don't have a big problem with 1.5 seconds (even though below 1 would 
> be nice), but 60 seconds it just.. well, scary.

Is this pure Solr time or overall application time?  I ask, b/c it is often
the case that people are measuring application time and the problem lies in
the application, so I just want to clarify.

Also, have you done any profiling to see where the hotspots are?


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