Hi Roland, I assume you are referring to the setting of the “NumberOfBuffers” INI file param, which it is recommended be set to 2/3 to 3/5 of available memory as detailed in the Virtuoso performance tuning guide at:
https://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtRDFPerformanceTuning
which is the maximum memory Virtuoso would allocate for hosting the database
working set in memory, before it starts swapping to and from disk, which would
significantly degrade performance.
Virtuoso would need to allocate additional memory for query execution dependant
on the type of query being executed ie to compile, execute result set, which is
why the recommendation is to allocate 2/3 to 3/5 of available memory such that
memory is available for servicing requests.
Best Regards
Hugh Williams
Professional Services
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> On 9 Dec 2016, at 21:47, Roland Cornelissen <metamatter...@gmail.com> wrote:
>
> Hi,
>
> I like to check if I understood this fact right: When a server has a
> certain amount of memory, let's say 64GB, then the optimal memory
> allocation for VOS is half of all memory, f.e. 32GB .
>
> If true, then why is this? Does VOS need the additional memory above
> 32GB in certain cases?
>
> Thanks!
>
> Rioland
>
>
>
>
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