Max number of processes with -SMP nn

Slash_2CPU · Post by **Slash_2CPU** » Sat Aug 01, 2009 10:13 am

Can I run -smp 32 or -smp 48? Looking at building an 8-socket, quad-core Opteron that will likely get upgraded to 6-core eventually.

Post by **toTOW** » Sat Aug 01, 2009 10:15 am

Yes you can ... I think kasson mentioned once that the client and servers recognize up to 64 CPUs (and if you have a system with more CPU, feel free to contact him

).

Slash_2CPU · Post by **Slash_2CPU** » Sat Aug 01, 2009 2:22 pm

Good to know. Thanks.

7im · Post by **7im** » Tue Aug 04, 2009 6:29 am

Slash_2CPU wrote:Can I run -smp 32 or -smp 48? Looking at building an 8-socket, quad-core Opteron that will likely get upgraded to 6-core eventually.

Having enough memory tends to be more of a limiting factor when getting up this high in the thread count.

Slash_2CPU · Post by **Slash_2CPU** » Tue Aug 04, 2009 7:32 am

Hoping 16GB is adequate for the 32-way.

Post by **bruce** » Tue Aug 04, 2009 9:04 pm

toTOW wrote:Yes you can ... I think kasson mentioned once that the client and servers recognize up to 64 CPUs (and if you have a system with more CPU, feel free to contact him ).

In principle, this will work, but if you've got the hardware and you're ready to try it, you may find yourself running into an unexpected bug or two. I don't believe that very many people have tested FAH on home systems that large yet. As systems like that enter the mainstream I'm sure that there will be plenty of testing and, if necessary, some (hopefully minor) bug fixes. I'm confident that it will work shortly after donors start turning up with that sort of hardware.

7im · Post by **7im** » Tue Aug 04, 2009 11:43 pm

Slash_2CPU wrote:Hoping 16GB is adequate for the 32-way.

Should be enough. Also curious to see how well it scales up to more processors. 2 clients with 16 cores each might run better at this early stage in development.

Post by **bruce** » Wed Aug 05, 2009 3:42 am

When do you plan to have a 32-way processor on-line?

Slash_2CPU · Post by **Slash_2CPU** » Wed Aug 05, 2009 3:14 pm

Difficult question.

Was planning build around the Tyan S4985 4-cpu board with the 4985-SI 4 socket expansion, and 8 8374 HE Opterons. Tyan EOL'd the S4985, so now it's a matter of finding a replacement board....

lelliott731 · Post by **lelliott731** » Sat Aug 29, 2009 12:34 am

Where do you see that they EOL'd the board? They just released a new BIOS on the 13th of this month, supporting the Istanbul CPU. You may want to wait a bit and see what the pricing on the Nehalem-EP Xeon's are. They are 8 core/16 thread, large cache Xeon's, that should be pretty fast. So in a basic 4 socket system, you'll have 32 cores & 64 threads.

Slash_2CPU · Post by **Slash_2CPU** » Sat Aug 29, 2009 7:55 am

http://www.tyan.com/product_board_detail.aspx?pid=271

Says "EOL."

Fortunately, the -SI version is not that badly priced. It also supports 6-cores for later. The project is coming along, but finding a case that will hold all that plus 2PSU's and still look something like an ATX tower is tricky.

lelliott731 · Post by **lelliott731** » Sat Aug 29, 2009 3:50 pm

Ahh, I see what you're talking about now. I believe that is the older model, not the one that is compatible with the 6 core Opteron's or HT3. The new model, S4985-SI is located here:
http://www.tyan.com/product_board_detail.aspx?pid=638. This model does not have an EOL next to the name, and like I said, just had a new BIOS released a few days ago.

ParrLeyne · Post by **ParrLeyne** » Sat Aug 29, 2009 8:26 pm

Slash_2CPU wrote:The project is coming along, but finding a case that will hold all that plus 2PSU's and still look something like an ATX tower is tricky.

I agree, finding a tower case for that monster mobo (16" x 13" / 411mm x 330mm) and 2 PSUs will be a real problem! I have found some cases which could hold 2 ATX mobo's and up to 4 PSUs, but the units don't support the mobo form factor.

Are you looking to build an uber folding system (8 sockets x 6 cores... etc)? :mrgreen:

Because you could build a complete 2 socket x 6 core system for the price of the Tyan mobo and a single AMD 8000 series CPU. :egeek:

P.S. I am not critisizing, I have been thinking about the possibilities myself. :ewink:

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