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Dual Processor SETI crunching question

T

TenaciousT

Member
I've always wanted a little dual processor machine to play with so I grabbed together my $20.00 and hit eBay and got a dual P-II 300 mhz board and processors.

Yes I know, it's just a P-II but I didn't want to jump headfirst into dual processing without some experience.

Anyway, I have the CLI SETI client running on it and I expected MUCH faster times than a regular P-II but they are virtually identical.

What gives?

Info:

2 P-II 300 mhz
Windows 2K
192 MB PC100 ram (boo!)
Seti CLI
Seti Driver
Seti Spy

I've fiddled around with a few of the settings but nothing seems to make a difference.

I can make two processes run at the same time but I'd like to see if I can get both CPUs crunching the same WU.

Processor affinity?

Thanks in advance.
 
You cant get both CPU's crunching the same wu, but if they are both crunching different wu's you should get a lil bit less than 2x 300mhz systems?

EDIT: I just checked my queue, my P3 500 duallie with 1 CPU does 1 WU every 9:45, with 2 CPU's does 2 every 11:30.
 
Yep, the folks here are pretty quick with the answers. 🙂

A large part of the slower times for dual cpus as compared to single chips, is the available memory bandwidth for the processors. Try it with more than two processors, like Pentium Pros(4-way or 6-way) and you'll really see slowdowns! :Q The RC5/OGR project client supports(ed) SMP configurations natively, so the 1 client could take advantage of more than one processor, but the client has to be written to do that - the S@H client isn't. Major bummer too. 🙁


 
Make sure you're running SETI DRIVER and the number of processes is set to 2. SETI is NOT SMP cabable so you have to simply run two processes....works well like that.
 
Dual PII 300s will take an extra hit on WU times due to 66MHz FSB.

To give you a vague idea of WU times for a single PII system (not 100MHz) my mate Dave has a PII 333@374 (75MHz FSB) & it does WUs in about 15hrs using CLI v3.03
 
When I had a dual P2 233 server it did two WU's per day with regularity.
Processes set to two, affinity checked.
 
Hehe ,I bet those dual Klamath cpus put out some heat😉
I remember running a PII 233@280 ,112FSB,CAS2 on a BX mbrd running CLI v2.4 ,it did WUs in a little over 10hrs!:Q
 
Update:

Two WUs take about 20hrs using SETI Driver and the CLI client.

Bleh! I was hoping for so much more!

I wonder if BOINC will do better...
 
Seti under BOINC is currently 50-80% slower...

Just to give another comparison, my dual p2-333 running NT4 crunches "normal" wu under v3.03 at 18h20m, and VLAR under v3.08 at 16h50m... 😀



 
"Bleh! I was hoping for so much more!"

If those were Xeon's with 2 megs cache you would be getting more.
Also if you could oc the memory to 100mhz you would get a good bump, not possible on most dual P2 mobo's tho & most of the P2's I've seen don't OC very well.
 
Though the Klamath PIIs didn't have their multipliers locked ,just limited to no higher than default.So you can set a lower 1,that's what I did with mine🙂
 
Has anyone else tried it with the new Hyper-threading Intels? I have a 2800 with HT at work that I'm currently running 2 SETI's (in different directories) and i seem to be getting about 3 hour completions. I noticed with only one client running, I was only using 50% of one of the CPU's (according to task manager), so I installed another and it's now using 100% of both. The OS is Windows Server 2003. I'll have to take SETI off when it starts acting like a server. =(

Anyone else have input?


http://www.closedsocket.com
 
Originally posted by: Xemus
Has anyone else tried it with the new Hyper-threading Intels? I have a 2800 with HT at work that I'm currently running 2 SETI's (in different directories) and i seem to be getting about 3 hour completions. I noticed with only one client running, I was only using 50% of one of the CPU's (according to task manager), so I installed another and it's now using 100% of both. The OS is Windows Server 2003. I'll have to take SETI off when it starts acting like a server. =(

Anyone else have input?


http://www.closedsocket.com[/q

The best way to run SETI on the HT's, is by running two processes like you have done 🙂
Click to expand...
 
If you're using setidriver you only need one install of seti, Setidriver will run two instances for hyper threaded P4's. I getting 12-13 a day on my 2.4 p4 dell at work and it also has the Rebel Alliance's work q on it.
 
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