Hi Karel,
> Forgot to mention the machine details:
>
> 24GB RAM
> 2x quadcore Xeon E5540 2.5GHz
> Virtuoso data is on SSD disks
Your parameters look ok, but you may want to try adding the following:
[Parameters]
...
DefaultIsolation = 2
...
which sets a different transaction isolation level which is more
suitable for situation where updates/deletes and queries are done on
the same server.
Did you also set your linux kernel swappiness parameter as per the
following Tips and Tricks article:
http://www.openlinksw.com/dataspace/dav/wiki/Main/VirtTipsAndTricksGuideRDFPerformanceTuning
If not than your Linux kernel may start swapping out parts of your
virtuoso process pages in favor of filesystem cache which will
seriously hurt virtuoso's performance.
In general you should make sure your system never starts swapping.
Can you tell me the exact version of VOS you are using on your system
and whether you are using the OS supplied version or if you compiled
and installed it yourself. Note that the current version of Virtuoso
OpenSource is 6.1.3 from:
http://sourceforge.net/projects/virtuoso/files/
However if you are running an older version and are not afraid to do a
build yourself, i would like to give you access to a prerelease of the
upcoming 6.1.4 which has a number of new optimisations and fixes that
maybe of benefit.
Lastly on the subject of this dbpintegrator part, can you tell me the
content of the file:
lastDownloadDate.dat
Patrick
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