Another book that any Solaris user should have in the library is this one<http://www.pearsonhighered.com/educator/product/Solaris-Performance-and-Tools-DTrace-and-MDB-Techniques-for-Solaris-10-and-OpenSolaris/9780131568198.page>. Richard McDougall is one of the authors. He is a scheduled speaker at the Hotsos Symposium <http://www.hotsos.com/sym10.html> in Dallas this March 7–11 (as is Kerry), which *you should not miss*. Cary Millsap Method R Corporation http://method-r.com On Wed, Dec 2, 2009 at 8:47 PM, Kerry Osborne <kerry.osborne@xxxxxxxxxxx>wrote: > I'm not too familiar with aix but Solaris has several scheduling algorithms > (Real Time, Fair Share, Time Share, etc...) These have different ranges of > priorities. Do a man on ps. It probably has options to show priority and > scheduling class (i.e. the algorithm). Mixing different algorithms in a > single VM can cause problems. > > Here's the command in solaris that shows that info: > > ps -ef -o user,pid,project,class,zone,pset,pri,nlwp,psr,time,args > > As already mentioned, vmstats/sar should also give you a good clue as to > whether processes are struggling to get on the CPU. > > There is a great Solris Internals book that describes all the scheduling > algorithms among other things. I presume there is a similar reference for > AIX. Also, I'd recommend Millsap's book for a better understanding of > how/why unaccounted for time occurs. > > Kerry Osborne > Enkitec > blog: kerryosborne.oracle-guy.com > > > > > > > > On Dec 2, 2009, at 2:13 PM, Larry G. Elkins wrote: > > Listers, >> >> SA's asking for assistance on how to tell if a process is being impacted >> and >> to what degree by processor pre-emption. AIX 5.3. Asked in the context of >> trouble-shooting some significant unaccounted for time issues in 10046 >> trace >> files (e.g. 14 of 16 seconds unaccounted for vendor process, 300 of 700 >> seconds unaccounted for vendor batch job, etc). SA's have "ruled out" >> overhead of writing the trace file so now looking at the pre-emption >> aspect. >> A bit out of my league, and I find plenty of approaches in IBM docs, and >> from people on this list (but geared more towards Solaris and other >> flavors, >> not Aix). 9.2.0.8 EE and 10.2.0.4 EE, "static" and dynamic LPAR's, seen on >> various boxes and databases. >> >> Larry G. Elkins >> >> >> -- >> //www.freelists.org/webpage/oracle-l >> >> >> > -- > //www.freelists.org/webpage/oracle-l > > >