[protege-discussion] Undelivered Mail Returned to Sender

[Tania Tudorache]

Congmin,

I did receive your email. Indeed this is a problem, that you have to 
first load the OWL file in memory and then to export it to an OWL 
database. We are looking at ways on how to do a streaming writing to the 
database directly.

Until then, you need to increase the heap size, if you need to 
accomodate very large ontologies.

Tania

Congmin min wrote:

> Hi, Tania:
>
>       I am attaching three files for your testing:
>       The .tar.gz contains three owl files I generated. Both are very 
> simple owl files, only containing one class and a number of instances 
> of this class. This is just for testing purpose. And three files are 
> quite small: about 8 MB, 5 MB and 3 MB.
>      
>      test.200000.owl: one 'Concept' class and 120000 instances of it
>       test.120000.owl: one 'Concept' class and 120000 instances of it
>       test.50000.owl: one 'Concept' class and 50000 instances of it
>
>    On my computer I can load test.50000.owl within 2 minutes, 
> test.120000 within 5 minutes, but can't load test.200000.owl (I waited 
> for 30 minutes). My computer has about 1GB memory.
>
>    If your computer is more powerful than mine, you can use the little 
> test.cc to generate an ontology with more than 200000 instances of a 
> class, (you only need to pass a 'number'  you want at the command line 
> when executing 'a.out' ) and then test agin.
>
>    If I am not doing something wrong, it looks like Protege doen't 
> allow a class to have a certain number of instances; otherwise, it 
> would have difficluty in loading the file. This is true to database 
> option.
>
>  If you received this email, please kindly let me know.
> Thank you
>
>     
>
>   
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>     ---------- Forwarded message ----------
>     From: "Congmin min" < marlonmin at gmail.com
>     <mailto:marlonmin at gmail.com>>
>     To: protege-discussion at lists.Stanford.EDU
>     <mailto:protege-discussion at lists.Stanford.EDU>
>     Date: Wed, 6 Sep 2006 14:54:26 -0500
>     Subject: [protege-discussion] Number of Instances of one class can
>     not be large??
>     I am doing some experiments and seems to find another BUG. To
>     officially
>     report that, I want to ask:
>
>     Is there any restrictions on the number of instances of one class? The
>     problem I have now is that once the number of instances of one
>     class exceeds
>     a certain number, Protege failed to load the OWL File, although
>     the file is
>     pretty small, just several MBs. It is not a memory issue.
>
>     Thanks for any info.
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