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What is the ftable_hash_locks kernel param on HPUX 11iv1? What does it do?

 
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Craig A. Sharp
Super Advisor

What is the ftable_hash_locks kernel param on HPUX 11iv1? What does it do?

We are being told that our setting for this param is too small for our nfile setting. I need to know what this parameter does and what it will effect.

I understand that this is the file table spinlock pool size but I need a better understanding.

Thanks!

Craig
3 REPLIES 3
Steven E. Protter
Exalted Contributor
Solution

Re: What is the ftable_hash_locks kernel param on HPUX 11iv1? What does it do?

Shalom Craig,

Reading project.

http://docs.hp.com/en/939/KCParms/KCparam.SpinLockParms.html

The doc explains it better than I can.

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=825603

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Pete Randall
Outstanding Contributor

Re: What is the ftable_hash_locks kernel param on HPUX 11iv1? What does it do?

Craig,

You might want to take a look at SAM's Help on Configurable Paramters:

" These parameters are for use by advanced users only who have a
thorough understanding of how spinlocks are used by multiple
processors and how the number of spinlocks needed are related to
system size and complexity. Do not change these from their default
value unless you understand the consequences of any changes. In
general, these values should not be altered without the advice of HP
support engineers who are thoroughly familiar with their use.

Setting these parameters to inappropriate values can result in severe
performance problems in multi-processor systems."

-and-

"In simple terms, spinlocks are a mechanism used in multiple-processor
systems to control the interaction of processors that must be held off
while waiting for another processor to finish a task so the results can
be passed to the waiting processor. Spinlocks control access to file-
system vnodes, I/O ports, buffer cache, and various other resources. "

There's more - too much to list here - check it out.


Pete

Pete
Craig A. Sharp
Super Advisor

Re: What is the ftable_hash_locks kernel param on HPUX 11iv1? What does it do?

Thanks for your quick answers...I think I better understand now.