Barton, Where can I find more details on the Toronto presentation?
- Alex Barton Robinson wrote: > > Yes, I do. > > >virtual machines method of measuring time does anybody know of a > >Linux utility for performance measurement that understands that > >it is working under VM. thanks > > TOP, SAR, VMSTAT, etc, that produce CPU numbers from Linux > on s/390 on either VM or on LPAR with undedicated processors > will have incorrect CPU times. The sampling technique used by Linux > to determine CPU times is very dependant on dedicated resources. > Which of course does not happen on VM. As load increases, TOP > and any other Linux based accounting will become MORE incorrect. > > The presentation I've just given at WAVV and SHARE actually > shows 10 linux servers, each thinking they were using 100% of > available resource. Thus all the CPU numbers provided by Linux > were off by a factor of 10 - what's an order of magnitude > between friends, eh? This presentation will be given at the > UK CMG May 21 for Clive and friends.... And Toronto May 10th. > and.... > > The simple solution: (Warning, vendor advertisement follows) ESALPS > (Linux Performance Suite) will take the process and Linux CPU > numbers, and if/when running in a virtual machine, will prorate > the Linux numbers to the VM numbers, thus able to report > accurate CPU utilizations by process and for each linux server. > You can see http://velocitysoftware.com/esalps.html > for more information. > Simply, you absolutely need the VM information integrated with > the Linux information to provide an accurate performance or > accounting picture. > > >From: "C Jordan (Clive)" <[EMAIL PROTECTED]> > > > >We are trying to measure performance of Linux guests under zVM > >using the tools available on Linux ( top vmstat sar ) along with > >monitor data from CP. In an unconstrained VM system the cpu > >usage as measured by VM and Linux is about the same . If we then > >start up a looping virtual machine to act as a cpu soak these > >figures diverge quite a lot . Rob van der Heij touched on this > >over two years ago in this forum " IMHO the BogoMips should at > >least be corrected for what PR/SM or CP say your unvoluntary > >wait was. I would not be surprised to find more areas in Linux > >where elapsed time is assumed to be equal to CPU time. ". > > > >Whilst accepting that this is probably a combination of the way > >the CP scheduler is handling the users and also the Linux > >virtual machines method of measuring time does anybody know of a > >Linux utility for performance measurement that understands that > >it is working under VM. thanks > > > >Clive Jordan > > "If you can't measure it, I'm Just NOT interested!"(tm) > > /************************************************************/ > Barton Robinson - CBW Internet: [EMAIL PROTECTED] > Velocity Software, Inc Mailing Address: > 196-D Castro Street P.O. Box 390640 > Mountain View, CA 94041 Mountain View, CA 94039-0640 > > VM Performance Hotline: 650-964-8867 > Fax: 650-964-9012 Web Page: WWW.VELOCITY-SOFTWARE.COM > /************************************************************/ > > "If you can't measure it, I'm Just NOT interested!"(tm) > > /************************************************************/ > Barton Robinson - CBW Internet: [EMAIL PROTECTED] > Velocity Software, Inc Mailing Address: > 196-D Castro Street P.O. Box 390640 > Mountain View, CA 94041 Mountain View, CA 94039-0640 > > VM Performance Hotline: 650-964-8867 > Fax: 650-964-9012 Web Page: WWW.VELOCITY-SOFTWARE.COM > /************************************************************/ -- Alex deVries, Principal Solutions Architect, The Puffins at Linuxcare 613.562.2759 tel [EMAIL PROTECTED], http://www.linuxcare.com/ Linuxcare, Putting open source to work.
