How to check the JVM bits ?

[henryz]

Hi,

I have a JVM installed on a Linux box, can someone tell, how to find if this is a 32 or 64 bits of JVM? How to check it? Where can I find/and download 64 bits 1.3.1 JRE?

Thanks,
Henry

 

[Mag0007]

On Linux, most likely you are running 32bit.

There is only 64bit version of Java on Itanium processors (last I checked).

For Sparc and RS6k there are 64bit versions.

HTH

 

[henryz]

That's what you guess, can you check somewhere, do you know any commands to confirm this?

 

[SamBones]

Try this...

getconf WORD_BIT

Hope this helps.

 

[Mag0007]

try adding the -d64 bit flag...if it does not error out you are using 64bit JVM, if not 32bit it is...

 

[henryz]

Thanks SamBones, your command is checking the Linux kernel bits, not sure if it checks the JVM bits. Maybe it's easy to have a scenario, say two versions of JVM installed on a Linux server, one is 32 bits JVM, another is 64bits JVM. How can you differentiate them?

 

[sedj]

The 1.3.1 JRE is not available in 64 bit version.

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http://www.primrose.org.uk

 

[SamBones]

If the OS is 32 bit only, it doesn't matter if the JVM is 32 or 64 bits. If the OS is 32 bits, you're living in a 32 bit world.

Hope this helps.

 

[henryz]

Hi SamBones,

The server I use is an Itanium (64bits) processor, so it's definitely in a 64 bits world.

Tried the command on my server box: getconf WORD_BIT

Interesting it returned with 32, which I think it's wrong. Maybe there is a bug there.

Thanks,
Henry

 

[sedj]

As I said before, the 1.3.1 JRE is only available in 32-bit - so this whole discussion is pointless !!!

--------------------------------------------------
Free Java/J2EE Database Connection Pooling Software

http://www.primrose.org.uk

 

[SamBones]

Oh come on sedj, some of the best arguments/conversation are on pointless topics!

 

[stefanwagner]

jinfo might underline the things we know so far...

seeking a job as java-programmer in Berlin:

http://home.arcor.de/hirnstrom/bewerbung