Howdy!
Gus Correa wrote:
Hi Chris
Chris Samuel wrote:
- "Gus Correa" wrote:
This is about the same number I've got for an atmospheric model
in a dual-socket dual-core Xeon computer.
Somehow the memory path/bus on these systems is not very efficient,
and saturates when more than two proc
> > The older Woodcrest/Clovertown type CPUs had the
> > standard Intel bottleneck of a single memory
> > controller for both sockets.
>
> Yes, that is for fact, but didn't the
> Harpertown generation still have a similar problem?
Yes.
>
> Amjad's Xeon small cluster machines are dual socket dua
Hi Chris
Chris Samuel wrote:
- "Gus Correa" wrote:
This is about the same number I've got for an atmospheric model
in a dual-socket dual-core Xeon computer.
Somehow the memory path/bus on these systems is not very efficient,
and saturates when more than two processes do
intensive work con
- "Gus Correa" wrote:
> This is about the same number I've got for an atmospheric model
> in a dual-socket dual-core Xeon computer.
> Somehow the memory path/bus on these systems is not very efficient,
> and saturates when more than two processes do
> intensive work concurrently.
> A similar
Hi Amjad
amjad ali wrote:
Hi Gus,
your nice reply; as usual.
I ran my code on single socket xeon node having two cores; It ran linear
97+% efficient.
Then I ran my code on single socket xeon node having four cores ( Xeon
3220 -which really not a good quad core) I got the efficiency of aroun
The performance of GigE can vary widely based on several
issues:
- chipset
- driver
- driver settings (interrupt coalescing etc.)
- switch performance under load
- switch manufacturer
A well tuned GigE network is never as good as
IB or Myrinet, but it can work well for some codes.
You can a
Hi Gus,
your nice reply; as usual.
I ran my code on single socket xeon node having two cores; It ran linear
97+% efficient.
Then I ran my code on single socket xeon node having four cores ( Xeon 3220
-which really not a good quad core) I got the efficiency of around 85%.
But on four single socke
Hi Amjad
There is relatively inexpensive Infiniband SDR:
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http://www.colfaxdirect.com/store/pc/viewPrd.asp?idproduct=12
http://www.colfaxdirect.com/store/pc/viewCategories.asp?SFID=12&SFNAME=Brand&SFVID=50&SFV
Hi all,
I have, with my group, a small cluster of about 16 nodes (each one with
single socket Xeon 3085 or 3110; And I face problem of poor scalability. Its
network is quite ordinary GiGE (perhaps DLink DGS-1024D 24-Port
10/100/1000), store and forward switch, of price about $250 only.
ftp://ftp10
