SMP Scheduling Policy in HP-UX

[Michael Steele_2]

OK, I just got asked this on a preliminary HP-UX exam for an Ernst and Young job in Lynhurst, NJ, and I've never heard of it, nor can I readily find information about it on the ITRC. I can, however, find some articles via webcrawler pertaining to Linux and Aix. Multiple choice answers were specific to parallel CPU handling, system resources, threads and processes. Here was the first of five answers, A.) The child process initially is scheduled to the same CPU as the parent process...., approximate.

Thanks in advance.

[Ian Kidd_1]

From the context of the answer, I think you were asked about the symmetrical multiprocessor scheduling policy in HP-UX. There's not a lot of published info about this. I have heard that HP is seriously interested in a book about performance tuning, so I'd imagine this stuff would be in it ... If HP Press ever gets around to writing/publishing it.

If my notes are accurate (and if anyone follows this thread, please correct me if you see something inaccurate):
"A child process is set to run initally on the CPU as the parent process. One of the reasons for this is because the child inherits the same environment.."
[note: looking at my notes, I'm sure there's a more technical term for this]
"This data was already stored on that CPU's cache. Running the child process on the same processor as the parent process allows the system to utilize this cache. This design allows for better performance than creating the child on another CPU"

Unfortunately, y notes don't go in depth into this subject. Is there something more specific you were looking for?

[Michael Steele_2]

Any discussion or document explaning its usage in HP-UX especially as it pertains to system and process resources. For example, time slicing(??) in a multi CPU environment, or, will processes be reassigned other resources, i.e, CPUs, after wake up.

[Steven E. Protter]

http://docs.hp.com

Everything you want to know should be found there.

SEP

[T G Manikandan]

These are the process Management docs.
You have all the information in there,

http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000009491262

http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000062686729
http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000062686732

If you are unable to access the links

check /usr/share/doc/proc_mgt.txt on the system

Thanks