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[protege-discussion] Protege 3.4.4 (579) 64-bit max heap size

Len Yabloko protege at
Fri Sep 3 18:47:03 PDT 2010

Thank you for all responces. I spent much of the day trying to use all available memory for loading Protege frames. The best result I got was with 
-XX:MaxPermSize=3000M, although I am not sure that was it. Here is the screenshot of Windows 7 task manager showing the big plato and then sudden jump at the end. Can someone explain it?

>I would try setting the initial heap size, as well (-Xms6g).  Otherwise, the
>heap must be grown over the runtime in possibly many smaller chunks, which
>can slow performance.
>On Fri, Sep 3, 2010 at 12:57 PM, Len Yabloko <protege at> wrote:
>> Hello everyone,
>> I am running latest Protege Frames version on Windows 7 64-bit and trying
>> to generate a very large frame ontology by loading data from MySQL database
>> using frame API. I have allocated 6G to jvm and checked Runtime.maxMemory()
>> to verify that is was correctly allocated. But for some reason when memory
>> reaches about 2.5G (according to Windows task manager) it stops allocating
>> and loading slows after about 15,000 frames loaded. I tried launching
>> Protege with -vmargs -Xmx6g using 64-bit jvm, but no luck so far.
>> Can someone suggest what may be a cause of such behavior?
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