Diffrence between code complied on 32, 64 bit JDK?

[anna anhc]

Hi,

Just wanted to know if there will be any difference in terms of performance between code complied on 32, 64 bit JDK, while running on 32, 64 bit JDK?

Therotically there should not be any difference , but the .class files are in binary format and are created using specific jdk's. Thus there might be difference according to which JDK is used for compiling them.

Is there any documentation from sun/ oracle which confirms that there is no difference/ there is a difference?

[Pramod P Deore]

The space an object takes in the heap in 64-bit mode is 39.3% larger on average than in 32-bit mode. You may find more information here

[Henry Wong]

anna anhc wrote:
Therotically there should not be any difference , but the .class files are in binary format and are created using specific jdk's. Thus there might be difference according to which JDK is used for compiling them.

There are *no* class files differences between code compiled with the 32 bit and 64 bit versions of the same revision of Java. The class files should be the same.

Henry

[Campbell Ritchie]

Pramod P Deore wrote: . . . You may find more information here

They used Jikes and an IBM JVM for jdk1.4; things might have changed since then, and the Sun JVM might behave differently.

[Henry Wong]

Pramod P Deore wrote:The space an object takes in the heap in 64-bit mode is 39.3% larger on average than in 32-bit mode.

Having "ported" a lot of applications from a 32 bit environment to a 64 bit environment, I can say that I have never seen an increase of the memory footprint, average or otherwise, as large as 40 percent. Larger? yes. Forty percent larger? no.

Henry

[Jayavardhan geepi]

Can some one please explain the difference between 32 bit jdk and 64 bit jdk?

Jay

[Anayonkar Shivalkar]

Jayavardhan geepi wrote:Can some one please explain the difference between 32 bit jdk and 64 bit jdk?

Jay

Well, 32 bit jdk is meant to run on 32 bit platform, whereas 64 bit jdk is meant to run on 64 bit platform. However, class file is exactly same, not matter on which type of Oracle jdk it is compiled (i.e. class file created by 32 bit jdk on Windows is same as that created by 64 bit jdk on Linux)

I hope this helps.