Re: memory limit and the 64-bit era
Posted by
Volker Baecker on
Apr 04, 2007; 2:45pm
URL: http://imagej.273.s1.nabble.com/memory-limit-and-the-64-bit-era-tp3699808p3699812.html
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When I use the vm option -XX:+AggressiveHeap I get the out of memory at
5718Mb
Volker
Volker Bäcker a écrit :
> Hello,
> I wasn't aware of this. I just tried it and you are right.
> I run ImageJ on a 64bit winxp with 8GB memory.
> I allocated 6GB for ImageJ. I get the out of memory error when 4261Mb
> are used.
> I thought only the jvm would be concerned with memory access.
> Volker
>
> Michael Held a écrit :
>> hi,
>
>> I want to start the often discussed "memory limit" discussion in the
>> light of 64-bit processors again.
>
>> we have tested ImageJ on a 64-bit Intel P4 with Windows XP 64-bit
>> (Windows 2003 Server) on board and after an *extremely* painful search
>> we found the Java 64-bit for Windows (search the web for
>> 'jre-1_5_0_11-windows-amd64.exe' which perfectly works for Intel's P4
>> 64-bit and should for Core(2)Duo as well).
>> we used the latest ImageJ 1.38n and modified ImageJ.cfg to run under the
>> new 64-bit JVM.
>
>> so far we could allocate 3GB (-Xmx3000m) on a machine with 2GB
>> physically (which will be upgraded soon), but ImageJ file import crashed
>> after 1.85GB (instead of 1.7GB) with the "out of memory" exception (both
>> 'About ImageJ' and TaskManager showed an allocation about 3GB).
>
>> we will test and report further.
>
>> does anybody know why ImageJ has a general 4GB limit? I just guess that
>> any memory offset used in ImageJ is a good old 32-bit unsigned integer.
>> if so, are there plans to upgrade ImageJ for the 64-bit era?
>> (browsing of *large* datasets acquired by 5D microscopy is still one of
>> the major limitations in the life-sciences)
>
>> hope to start a discussion here...
>> cheers,
>> michael
>
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