Re: IBM AIX Kernel parameter limitations [HP issues]

In further researching this, it looks like the behavior of IBM AIX and HP-UX is similar, only the number of segments per process that will get you into trouble is different. With HP/HP-UX, if a process references > 2 shared segments in rapid fire order (ie the rate of change of the last 2 sseg references within a process' time quantum is high...) then the process slows way down. With IBM/AIX, the magic number is apparently 10. Much less obnoxious I think. Thanks for sharing your observations. Please post on the results of the KAIO investigation, I've heard others say they've had a hard time with HP-UX KAIO, but have never heard a definitive conclusion. Greg Rudy Fernandes wrote: snip...... > I don't know about the theory, but I've tested the performance impact > of having multiple Virtual segments as against a single large one of > the same size - under 10.20, in my tests, the 'single large' was over > twice as fast as the '5 small'. > > We are also finding KAIO slowing, yes slowing, us down significantly > (takes 50 to 150% more time depending on the type of task). We're > still investigating the cause. > > Rudy Fernandes > Purolator Courier > Rudy Fernandes > Purolator Courier, Canada > Off : rfernand@purolator.com > Res : rferdy@pathway.com