64 bit addressing

[lastgreatone]

Anyone know if 64 bit addressing is supported on a K9000/869 420 box? And what are, if any, the ramifications of running a 32 bit application on a 64 bit address system?

TIA

[James R. Ferguson · Accepted solution]

Hi Francoise:

Some, but not all, K-class systems support 64-bit 11.X. A K420 can only run 32-bit since it is a PA7200 style.

K-class (PA7x00) only support 32-bit.
K-class (PA8x00) support either 32- or 64-bit.

You can look at /usr/sam/lib/mo/sched.models on your current machine for which processor type your model represents.

Make sure you have the required minimum PDC revision and minimum firmware revision installed for your processor.

If you have the Diagnostic Support Tools loaded, you can obtain the values by doing the following:

# echo "selclass qualifier CPU;info;wait;infolog"|cstm > /tmp/procinfo

Match the PDC and firmware values to the table found in chapter-2 of "Installing HP-UX 11.0 and Updating HP-UX 10.x to 11.0":

http://docs.hp.com/hpux/onlinedocs/B2355-90679/B2355-90679.html

For information on running 32-bit applications on 64-bit operating systems, see this link:

http://devresource.hp.com/STK/index.html

...JRF...

[rick jones]

A K420 uses PA 1.1 CPUs and cannot run a 64-bit kernel.

As fara as running a 32-bit app on a 64-bit kernel goes, there should be no big issues.

[lastgreatone]

Hi Rick, what about a 32-bit application making a call to the 11-bit o.s., doesn't this create a memory overflow? Oracle8i is running in 32-bit mode on a 64-bit 11.0 o.s. There is only 512Mb of RAM, I was concerned that with memory overflow, this may take unnecessary resources and downgrade performance.

[Bill Hassell]

512 megs of RAM is woefully inadequate for Oracle unless you have a small database or not very many users, especially for a 64-bit kernel. There are no issues using 32 applications on HP-UX 64-bit as these programs are run within the 32-bit limits (3750 megs of addressing space max). The Oracle program doesn't know anything different about the 64-bit kernel.

BTW: The minimum recommended RAM for 64-bit HP-UX is 4000 megs.