retrieve OS architecture

[jitheshmenon]

Hi All,

How do I know whether a machine is a 32 bit one or a 64 bit one using java code?

I tried using System.getProperties(os.arch)
But it actually gives the JRE's one rather than the machine's actual one.

i.e. in my 64-bit machine I have 32-bit JRE installed
The os arch value obtained is x86.

Is there a way to do this?

I thought of checking the size of integer?How do we do this in java and will it help?

Thanks in advance
Jith

[crikey]

Well, you could use set a String to equal the property, and check if it contains a value:

String s = System.getProperty("os.arch");
if (s.contains("86") || s.contains("64")){
//This is a 64 bit OS
}
else if (s.contains("i")){
//this is 32 bit. I have it search for 'i' because it could be i386, i586 or i686 
}
else {
//Unknown or other arch
}

cheers,
Crikey

[jitheshmenon]

Hi Crikey..

I used the same technique which you mentioned..

May be you didnot read my question completely..

When we use System.getpropertes(Os.arch), it actually gives the JRE's bitness.. This is not what i want

I need the actual processor's "bitness" value

Hope that clear my question

Jith

[Prajin]

hi,
System.getProperty("os.arch");
this code always return OS architecture and from your 1st post your OS is x86(32-bit). it didn't mean you PC is 32-bit.

64-bit PC can have 32-bit OS, like you have 32-bit jdk in ur 64-bit PC.

How do I know whether a machine is a 32 bit one or a 64 bit one using java code?

I can't be done by System.getProperty(); and probably not by Java.

-regards

[travishein]

os.arch.data.model property ?
Properties : Java Glossary

but that probably is not going to hint if 64 bit machine when running a 32 bit os.

Kind of platform specific, for example, on linux if you look in the file "/proc/cpuinfo", maybe open it and parse the flags : value, there will be "lm" flag to mean long mode, to mean the CPU is working in 64 bit mode. But that does nothing for you on Windows. Perhaps, try to detect the "C:\Program Files" and separate "C:\Program Files (x86)" folders to infer 64 bit OS.