HP-UX server-32 bit vs. 64 bit

[Mariel Gonzales Faylona]

Hello, I would to know what is the difference between 32bit and 64 bit server.Does this affect some applications?If this affect the application why can I run an oracle 7.3.4 32 bit on 64 bit server. Do you have any documentations on camparison between the 2?
If you have where I can find those docs.

Best Regards,
Maye

[Vibhor Kumar Agarwal · Accepted solution]

Not much,

Just how many bits cpu and bus process and carry at a time.
So will increase the speed.

Our application doesn't worry how its being processed.

[jayachandran.g]

Hi Mariel

If you load a 32-bit application on a 64-bit processor your application will be able to give only 32bit output for kernel so there will be no change in performance level.

And if you load 64bit application in 64bit processor then you will get good performance.


For details on 32 and 64 bit you can look at the following links

http://www.hp.com/workstations/white_papers/docs/64bitWSadvantage_finalV2.pdf


http://www.datadirect.com/developer/odbc/why_choose_64bit/index.ssp


Jayachandran.G

[vinod_25]

Hi maye

In HP-UX, the program address space is divided into 4 quadrants. In 32 bits,
the quadrants are always limited to 1000 megs and cannot be changed. Thus, the maximum addressable space that a 32 program
can have is 1000 megs (actually, 960megs). By changing a mapping option with chatr or with the compile and link programs, the first quadrant (text area) and the data quadrant can be combined forming about 1750megs of addressable space. In 11.11 with patches, a 32bit program can actually extend the space
to about 2500megs but with restrictions.

These 32bit programs run in either a 32bit or 64bit version of HP-UX. But a 32bit version of HP-UX cannot 'see' any RAM above 3.75Gb.

The world of Unix is 64bits. With HP-UX (not always true with other OS), 32bit programs run just fine on a 64bit processor with 64bit HP-UX.

Regards

Vinod

[Indira Aramandla]

Hi Maye,

Applications developed/compiled using 32-bit kernel mode, in most cases,will run fine with 64-bit kernel mode as well.

The only case where a 32-bit application will not run on the 64-bit kernel is if an application needs the use of a kernel extension (a program that extends the kernel and may, for example, provide a new system call for the application) that is only available in 32-bit mode.

attached is a note that discusses the advantages of the 64-bit Oracle architecture.

Indira A

[Indira Aramandla]

Another attachment dicussing memory windows.

[Mahesh Kumar Malik]

Hi

1.64bit servers can address more memory than 32 bits ones.

2. 64 bit servers are based on latest hardware technology so their performance is better.

3. 32 bit application will run 64 bit hardware and operating system, but as mentioned above 64 bit HW performance is better, thus 32 bit application throughput will be better on it

Regards
Mahesh