topic Re: Programming KAIOs in Operating System - HP-UX

Programming KAIOs

Christof Schoeman — Mon, 17 Jul 2006 09:46:21 GMT

Hi there

I've been looking all over for information about kernelized async I/Os on HP-UX. What I found is how to set the system up so that kaio is available, and how to make Oracle use kaio.

However, now that my system (HP-UX 11.23) is prep'ed for kaio, I want to write my own programs to use kaio.

Where do I start? What system calls do I make?

Hope you can help, or point me in the right direction.

Ciao

Re: Programming KAIOs

Steven E. Protter — Mon, 17 Jul 2006 09:51:41 GMT

Shalom,

Perhaps a consultation with Dr. Google.

http://www.dbtalk.net/comp-databases-informix/kaio-vs-aio-2cpu-itanium-38613.html

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=995102
http://www.google.com/url?sa=t&ct=res&cd=2&url=http%3A%2F%2Fforums1.itrc.hp.com%2Fservice%2Fforums%2Fquestionanswer.do%3FthreadId%3D992511&ei=0aO7RO2KMIXC2gKd6pDRDQ&sig2=jJwo7XBW7HQ2QbrAeqGdjQ

SEP

Re: Programming KAIOs

Christof Schoeman — Mon, 17 Jul 2006 10:14:20 GMT

Thanks, SEP. I have already spent a long time at Dr. Google's office.

You'll notice that the last link you gave, points to forum post made by yours truly :-) So, I basically understand where kaio fits into the picture and the internal mechanisms involved.

However, the last time I programmed async I/Os was on OpenVMS, and I remember that there was a seperate set of system function calls that facilitated it.

Is it the same on HP-UX? Which functions do I use to do a kaio? Do I poll for I/O completion? Do I wait for the interrupt?

Oh yes, I want to do my kaio to raw volumes.