"Barbara Nitz" <nitz-...@gmx.net> wrote in message news:<listserv%201107060532590661.0...@bama.ua.edu>... > >In your note below you left out the number of engines as part of the equation > >for hardware MSU. > > Ah, the MSU is for one processor only, then! Only when I multiply the 74MSU > by the 6 processors that we have I arrive at 444 (instead of the quoted > 339)., i.e. almost 31% more 'hardware MSU' than 'software MSU'. > > > It also sounds as if you want to compute the hardware MSU for a series of > > models and show then as bars on the same chart as your actual data. The > > best way to do that, in my opinion, is to use service units all the way > around. > > You can do that by converting time back to service units and going forward. > > This might be an interesting exercise. At this point I am mainly interested > in showing the maximum 'capacity' of our basic model. > > On the other hand, my management knows that we have 339 MSU - if I start > using 444, nobody will have a clue what's what. Which might mean that I > would have to somehow convert the 444 to relate back to the 339 that are the > official MSU rating. > > As in: We are actually only getting 76% of the full capacity. I could use > *that* percentage as 76% of 3600s, meaning the maximum achievable cpu time > per 10 minute interval is 2736s. > > How's that for being convoluted? > > >Please note that this will not give good numbers or anything close to them if > > you change model families, such as from a z10 to a z196. It is only good > > within a single family. > Agreed. But so far we had been staying in the same family :-) > > Best regards, Barbara >
Consider 2 other things to make it more complicated: - Software MSUs are in really Marketing MSU's, in fact any other name than MSU would make the situation more clear. - Hardware MSUs are really hardware configuration denpendent, which means that any variation in hardware will change the SU conversion factor. Vary a CPU online and you have a different amount of MP overhead and therefor a different SU factor, which is indeed per processor as you discovered above. We even noticed similar 'hardware' adjustements when we had a problem with 1 cooling unit and the machine decided to slow down the processor frequency to produce less heat. The SU factor was adjusted accordingly at the same moment. Usually I am happy with the figure "% CPU Utilization", ranging from 0% to 100%. It is the number of CPU seconds used versus the number of CPU seconds available, which is clock seconds multiplied by the number of processors online. Kees. ******************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ******************************************************** ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
