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Newsgroups: comp.lang.java.programmer
Date: Mon, 17 Dec 2012 15:38:16 -0800 (PST)
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Subject: Re: 32G ram
From: Lew <lewbloch@gmail.com>
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Xref: csiph.com comp.lang.java.programmer:20401

Arne Vajh=F8j wrote:
> Donkey Hottie wrote:
>> Arne Vajh=F8j 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 a=
llocate=20
per process with a 32-bit Java.

Assuming the other posters are correct and you're using a 32-bit system. Ar=
e 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      11=
906
>>>> -/+ 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?
>=20
>> Apparently 32 bit, as the i686 OS is 32 bit PAE too.
>=20
> Then that explains it.
>=20
> 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 pro=
cess*, not=20
just the heap. If you allocate the whole amount for heap, that leaves nothi=
ng for stack=20
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?

--=20
Lew