On Fri, 07 Apr 2006 13:54:21 -0500 Scott Marlowe <smarlowe@xxxxxxxxxxxxxxxxx> wrote: > Are the same queries getting the same basic execution plan on both > boxes? Turn on logging for slow queries, and explain analyze them on > both machines to see if they are. See reply to Tom Lane :) > I'd put the old 4 way Xeon back in production and do some serious > testing of this pSeries machine. IBM should be willing to help you, I > hope. They probably would if this had been bought new - as it is, we have rented the machine for a month from a 2nd-user dealer to see if it's capable of taking the load. I'm now glad we did this. > My guess is that this is an OS issue. Maybe there are AIX tweaks that > will get it up to the same or higher level of performance as your four > way xeon. Maybe there aren't. The pSeries isn't much older than our Xeon machine, and I expected the performance level to be exemplary out of the box.. we've enabled the 64-bit kernel+userspace, and compiled pg for 64-bitness with the gcc flags as reccommended by Senica Cunningham on this very list.. > Myself, I'd throw a spare drive in for the OS, put some flavor of > linux on it Terrifying given I know nothing about the pSeries boot system, but at this stage I'm game for nearly anything. > http://www.asaservers.com/system_dept.asp?dept_id=SD-002 Multi-Opteron was the other thing we considered but decided to give 'Big Iron' UNIX a whirl... Cheers, Gavin.
