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

Knutson, Stanley sknutson at
Fri Sep 3 12:35:47 PDT 2010

How much physical memory do you have?   You can allocate more than
exits, so it just swaps pages in/out.
Disk light on all time after you get to that point is a clear indicator.
I would guess you have only 4gb real memory, so windows can only give
the process about 2.5 to 3gb before it has to swap

- Stanley

-----Original Message-----
From: protege-discussion-bounces at
[mailto:protege-discussion-bounces at] On Behalf Of Len
Sent: Friday, September 03, 2010 12:12 PM
To: User support for Core Protege and the Protege-Frames editor
Subject: Re: [protege-discussion] Protege 3.4.4 (579) 64-bit max heap

Yes, I tried all variations and seems to corrently allocate memory.

I have this code running inside my tab plugin:

public static long test = Runtime.getRuntime().maxMemory()/1014;
    static {
    	System.out.println("Total memory : " +test+ " KB");

It results in: Total memory : 5515235 KB

Windows 7 task manager show java.exe quickly climing to about 2G and
stays there. What could explain this? Do I need a specialy compiled

>Had you tried -Xmx6000M?
>Specify the initial size, in bytes, of the memory allocation pool. This

>value must be a multiple of 1024 greater than 1MB. Append the letter k 
>or K to indicate kilobytes, or m or M to indicate megabytes. The
>value is chosen at runtime based on system configuration.
>On 9/3/2010 10:57 AM, Len Yabloko 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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