Looking at runqueue in topas is often a good predictor. Are you running nmon? I recommend that you do.
On thing to look at there is vmstat -v, and watch to see if the I/O's blocked because of various buffers being unavailable increases day to day (or even hour-to-hour). The other thing in UD is to be sure that the SBCS shared memory segment is large enough. As in Highlander, there can be only one. Well, there _should_ be only one, anyway. If you ever have more than one, it's too small. Perhaps run for a day or so with a cron job that counts those every minute or so. If you're right on the cusp, where you shmget another, then fall under the threshold, releasing it, then rise gain to need another, you'll see the system crawling to the point where you'll be typing in a field, and it won't even echo until 15 seconds later, when all of a sudden dozens of characters will appear. You may also want to capture user counts throughout the day; that would be a strong hint about memory configuration. I forget: at 7.1, can you run in 64-bit? In 32-bit UD, there's some memory addressing constraints, as I recall. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, January 27, 2010 2:46 PM To: U2 Users List Subject: [U2] Predicting application performance I haven't found anything in the archives and I don't remember seeing this specific question addressed by the group. Please forgive if this has already been discussed. This is a mystery upon which I'm hoping this list can shed some light. I'll sit and watch nmon display CPU stats and see *tons* of waits but the end users experience no slowdowns. At other times nmon may show waits more in the 30% - 40% range and users start complaining about bad response times. We've tried watching I/O and memory/paging space also and don't see any discernible patterns. Does anyone have thoughts on how to predict UD app performance based on CPU, I/O or other system stats? UD 7.1 AIX 5.3 Disk: SAN (EMC) U.S. BANCORP made the following annotations --------------------------------------------------------------------- Electronic Privacy Notice. This e-mail, and any attachments, contains information that is, or may be, covered by electronic communications privacy laws, and is also confidential and proprietary in nature. If you are not the intended recipient, please be advised that you are legally prohibited from retaining, using, copying, distributing, or otherwise disclosing this information in any manner. Instead, please reply to the sender that you have received this communication in error, and then immediately delete it. Thank you in advance for your cooperation. --------------------------------------------------------------------- _______________________________________________ U2-Users mailing list [email protected] http://listserver.u2ug.org/mailman/listinfo/u2-users _______________________________________________ U2-Users mailing list [email protected] http://listserver.u2ug.org/mailman/listinfo/u2-users
