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Groups > comp.lang.java.programmer > #20401

Re: 32G ram

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Arne Vajhøj wrote:
> Donkey Hottie wrote:
>> Arne Vajhøj kirjoitti:
>>> mcheung63 wrote:
>>>>      i [sic] got 32GB ram, why i [sic] can't -Xmx2G, it got an error "Could not
>>>> create the Java Virtual Machine"

Because you allocated all the available memory to the heap, and none to the JVM
or class space, stack, ... .

How much RAM you have is irrelevant; it's how much RAM you are allowed to allocate 
per process with a 32-bit Java.

Assuming the other posters are correct and you're using a 32-bit system. Are you?

That might have been good to tell us in the beginning.

>>>> /root>free -m
>>>>                total       used       free     shared    buffers
>>>> cached
>>>> Mem:         32387      16973      15413          0        243      11906
>>>> -/+ buffers/cache:       4823      27563
>>>> Swap:         1906          0       1906
>>>> /root>uname -a
>>>> Linux localhost.localdomain 3.6.9-2.fc17.i686.PAE #1 SMP Tue Dec 4
>>>> 14:15:28 UTC 2012 i686 i686 i386 GNU/Linux
>>>
>>> 32 bit or 64 bit Java?
> 
>> Apparently 32 bit, as the i686 OS is 32 bit PAE too.
> 
> Then that explains it.
> 
> 32 bit Java on x86 usually only allows for around 1.7 GB
> of heap space.

Bear in mind, OP, that "2 GB" is the maximum allocation for the *entire process*, not 
just the heap. If you allocate the whole amount for heap, that leaves nothing for stack 
or the interpreter. That's why it fails.

So the 1.7 GB or so is all you can get and still leave room for Java itself.

But why, pray tell, are you using a 32-bit system?

-- 
Lew

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Thread

32G ram mcheung63@gmail.com - 2012-12-16 19:05 -0800
  Re: 32G ram Arne Vajhøj <arne@vajhoej.dk> - 2012-12-16 22:09 -0500
    Re: 32G ram Donkey Hottie <donkey@fredriksson.dy.fi> - 2012-12-17 10:39 +0200
      Re: 32G ram Arne Vajhøj <arne@vajhoej.dk> - 2012-12-17 17:37 -0500
        Re: 32G ram Lew <lewbloch@gmail.com> - 2012-12-17 15:38 -0800
      Re: 32G ram Nigel Wade <nmw@ion.le.ac.uk> - 2012-12-18 09:19 +0000
        Re: 32G ram BGB <cr88192@hotmail.com> - 2012-12-18 14:57 -0600
        Re: 32G ram Arne Vajhøj <arne@vajhoej.dk> - 2012-12-18 20:22 -0500
          Re: 32G ram Nigel Wade <nmw@ion.le.ac.uk> - 2012-12-19 11:28 +0000
            Re: 32G ram BGB <cr88192@hotmail.com> - 2012-12-19 07:19 -0600
            Re: 32G ram Arne Vajhøj <arne@vajhoej.dk> - 2012-12-19 09:17 -0500
              Re: 32G ram Tim Slattery <Slattery_T@bls.gov> - 2012-12-19 12:51 -0500
                Re: 32G ram Arne Vajhøj <arne@vajhoej.dk> - 2012-12-19 13:20 -0500
                Re: 32G ram BGB <cr88192@hotmail.com> - 2012-12-19 12:40 -0600
                Re: 32G ram Arne Vajhøj <arne@vajhoej.dk> - 2012-12-19 13:56 -0500
  Re: 32G ram Roedy Green <see_website@mindprod.com.invalid> - 2012-12-17 00:31 -0800
    Re: 32G ram Arne Vajhøj <arne@vajhoej.dk> - 2012-12-17 20:37 -0500
  Re: 32G ram Sven Köhler <remove-sven.koehler@gmail.com> - 2012-12-19 20:40 +0100

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