Hi Alex, Those settings for the NumberOfBuffers and MaxDirtyBuffers are the recommended settings for a 2GB machine as detailed in the Virtuoso performance tuning guide at:
http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtRDFPerformanceTuning
Note also the use of the “swappiness” parameter on Linux systems which can be
used to control the amount of swapping and improve performance as detailed at:
http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtRDFPerformanceTuning#”swappiness”
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
10 Burlington Mall Road, Suite 265, Burlington MA 01803
Weblog -- http://www.openlinksw.com/blogs/
LinkedIn -- http://www.linkedin.com/company/openlink-software/
Twitter -- http://twitter.com/OpenLink
Google+ -- http://plus.google.com/100570109519069333827/
Facebook -- http://www.facebook.com/OpenLinkSoftware
Universal Data Access, Integration, and Management Technology Providers
On 10 Jun 2012, at 17:41, Alex wrote:
> Hi,
> Ok I have solved my problem. So the critical parameters are the
> NumberOfBuffers and the MaxDirtyBuffers.
>
> Lowering their values and the reserved memory of virtuoso server reduces as
> well.
>
> I had been trying with 170.000 and 130.000. I have not found the optimal ones
> for best performance since I do not have time.
>
> I think someone must be careful not to enable the swap file (i.e., not enough
> memory), because afterwards the performance
> becomes a lot worse!
>
>
>
>
>
>
>
>
smime.p7s
Description: S/MIME cryptographic signature
