>Please correct me if I am wrong, but much of this discussion leads me to >believe that we are saying that there is essentially no reasonable way to >predict or model performance for a given application process.
I have been a performance/capacity analyst for 27 years, and worrying about CPU has become moot. Yes, there are some examples of sub-optimal algorithms; over the last 40+ years CPU reduction rarely impacts performance any more (IMO). I/O and resource contention are the biggest/heaviest hitters. Optimise those and you'll get a bigger bang for your effort. I'm constantly amazed at the number of files out there with 'bad' block-sizes, no buffering, etc. These will be a better place to spend your time. Resource contention is either caused by a mis-match of shared versus exclusive intent, or scheduling. Again, you can do better if you spend your effort here (again, imo). If you cannot show a CPU savings outside the band-width of the variance of measurement, then I posit that you are likely wasting time and effort. - Too busy driving to stop for gas! ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
