On 29 Aug 2003 at 0:05, William Yu wrote: > Shridhar Daithankar wrote: > >> Be careful here, we've seen that with the P4 Xeon's that are > >>hyper-threaded and a system that has very high disk I/O causes the > >>system to be sluggish and slow. But after disabling the hyper-threading > >>itself, our system flew.. > > > > Anybody has opteron working? Hows' the performance? > > Yes. I'm using an 2x 1.8GHz Opteron system w/ 8GB of RAM. Right now, I'm > still using 32-bit Linux -- I'm letting others be the 64-bit guinea > pigs. :) I probably will get a cheapie 1x Opteron machine first and test > the 64-bit kernel/libraries thoroughly before rolling it out to production.
Just a guess here but does a precompiled postgresql for x86 and a x86-64 optimized one makes difference? Opteron is one place on earth you can watch difference between 32/64 bit on same machine. Can be handy at times.. > > As for performance, the scaling is magnificient -- even when just using > PAE instead of 64-bit addressing. At low transaction counts, it's only > ~75% faster than the 2x Athlon 1800+ MP it replaced. But once the > transactions start coming in, the gap is as high as 5x. My w-a-g: since > each CPU has an integrated memory controller, you avoid memory bus > contention which is probably the major bottleneck as transaction load > increases. (I've seen Opteron several vs Xeon comparisons where > single-connection tests are par for both CPUs but heavy-load tests favor > the Opteron by a wide margin.) I suspect the 4X comparisons would tilt > even more towards AMD's favor. I am sure. But is 64 bit environment, Xeon is not the compitition. It's PA-RSC- 8700, ultraSparcs, Power series and if possible itanium. I would still expect AMD to compete comfortably given high clock speed. But chipset need to be competent as well.. I still remember the product I work on, a single CPU PA-RISC 8700 with single SCSI disc, edged out a quad CPU Xeon with SCSI RAID controller running windows in terms of scalability while running oracle. I am not sure if it was windows v/s HP-UX issue but at the end HP machine was lot better than windows machine. Windows machine shooted ahead for light load and drooeed dead equally fast with rise in load.. > We should see a boost when we move to 64-bit Linux and hopefully another > one when NUMA for Linux is production-stable. Getting a 2.6 running now is the answer to make it stable fast..:-) Of course if you have spare hardware.. Bye Shridhar -- briefcase, n: A trial where the jury gets together and forms a lynching party. ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings
