Disappointing AMD 64 SETI Speeds

Anyone run 64-bit SETI on a 64-bit OS? I gave it a shot and was quite disappointed.

I’m running an Athlon 64 3200+ under SUSE Linux 64-bit.
I’ve loaded the x86_64 version of SETI and have it running from the command line.
It’s completed 18% in the last hour! At that rate it will take over 5 hours to complete one unit! Just to give you an idea, an Athlon XP 2400+ running 32-bit Linux completes a unit in about 3 hours. This same Athlon 64 computer running standard 32-bit Windows completes a unit in about two hours.

What’s up with the Athlon 64, running 64-bit code?

I don't know why it's so much worse, but I can tell you why it's not any better. SETI doesn't have a 64 bit optimized version out right now. So software wise, your 64 bit OS is running a 32 bit program. Think running a program written for a 486 under Win95. It still shouldn't crush performance that bad, but maybe it does-dual boot for you?

Mobile P4 1.6 @ 2.4 - Gigabyte 8ipe-1000 Pro - 4x256 Corsair Value PC3200 - MSI 128 MB 9800Pro @ 435/730 - 80Gb WD 8Mb Cache -

No, I'm going to run SETI a bit longer. I'm going for the 25,000 mark. I'm ranked 7486th out of the 5.3million+ so far. I'm now geekishly obsessed with my stats!

From what I read, the x86-64 version is a straight compile from C, where as the 32 bit clients have been hand tuned. I've seen some tests somewhere sometime where they compared C compiled Seti clients in 32 and 64 bit mode, and the 64 bit one was like 10% faster. 10% is nothing compared to what hand tuning can do. Until someone builds a better 64 bit client, I'm afraid you're out of luck.

= The views stated herein are my personal views, and not necessarily the views of my wife. =

Ya, it's a group for my website. I'm the only one with serious numbers though...
http://setiathome2.ssl.berkeley.ed [...] 13209.html