| Author |
Message |
Bjorn Ljungdahl
*nix forums beginner
Joined: 16 May 2005
Posts: 43
|
 Posted: Sat Feb 11, 2006 8:03 am Post subject:
Re: Does Origin2K memory placement matter?
|
|
|
roberson@hushmail.com (Walter Roberson) wrote:
| Quote: | In article <ut2nu1d0j03fm0hdo3aptdbsm5ug93i79n@4ax.com>,
Bjorn Ljungdahl <z.cochrane@hotmail.com> wrote:
Is it important to balance the amount of memory
in each nodeboard in an O2K?
Could there for example be any difference in an
1+1+1+1Gb config compared to 2+1+0.5+0.5Gb,
or is 4Gb always 4Gb?
Can there be any noticeble performance gain/loss
if the memory is not equally distributed.
You always want your memory to be as close as possible to the
CPU that is using it. Balancing memory is not necessarily
the best, as memory access is not necessarily balanced.
|
Your replies both make sense. As usuall it is pretty much
depending on the application.
Thanks
/Bjorn |
|
| Back to top |
|
 |
Walter Roberson
*nix forums Guru
Joined: 19 Feb 2005
Posts: 1300
|
| Posted: Fri Feb 10, 2006 1:49 am Post subject:
Re: Does Origin2K memory placement matter?
|
|
|
In article <ut2nu1d0j03fm0hdo3aptdbsm5ug93i79n@4ax.com>,
Bjorn Ljungdahl <z.cochrane@hotmail.com> wrote:
| Quote: | Is it important to balance the amount of memory
in each nodeboard in an O2K?
Could there for example be any difference in an
1+1+1+1Gb config compared to 2+1+0.5+0.5Gb,
or is 4Gb always 4Gb?
Can there be any noticeble performance gain/loss
if the memory is not equally distributed.
|
You always want your memory to be as close as possible to the
CPU that is using it. Balancing memory is not necessarily
the best, as memory access is not necessarily balanced. |
|
| Back to top |
|
|
Robert Ramsey
*nix forums beginner
Joined: 27 Mar 2005
Posts: 20
|
| Posted: Fri Feb 10, 2006 1:34 am Post subject:
Re: Does Origin2K memory placement matter?
|
|
|
Hello,
It's my understanding that having the memory evenly distributed across all
node boards gives you best performance. It's my impression that this would
reduce traffic on the mid/backplane.
-Rob
"Bjorn Ljungdahl" <bjorn.ljungdahl@telia.nospam.com> wrote in message
news:ut2nu1d0j03fm0hdo3aptdbsm5ug93i79n@4ax.com...
| Quote: | Hi,
This probably mostly teoretical but still :-)
Is it important to balance the amount of memory
in each nodeboard in an O2K?
Could there for example be any difference in an
1+1+1+1Gb config compared to 2+1+0.5+0.5Gb,
or is 4Gb always 4Gb?
Can there be any noticeble performance gain/loss
if the memory is not equally distributed.
Then there is also the question if 4x256Mb is better
than 16x64Mb...except for future expansion...
/Bjorn |
|
|
| Back to top |
|
|
Bjorn Ljungdahl
*nix forums beginner
Joined: 16 May 2005
Posts: 43
|
| Posted: Thu Feb 09, 2006 6:45 pm Post subject:
Does Origin2K memory placement matter?
|
|
|
Hi,
This probably mostly teoretical but still :-)
Is it important to balance the amount of memory
in each nodeboard in an O2K?
Could there for example be any difference in an
1+1+1+1Gb config compared to 2+1+0.5+0.5Gb,
or is 4Gb always 4Gb?
Can there be any noticeble performance gain/loss
if the memory is not equally distributed.
Then there is also the question if 4x256Mb is better
than 16x64Mb...except for future expansion...
/Bjorn |
|
| Back to top |
|
|
Google
|
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
Forum index
»
*nix
»
SGI/IRIX
»
hardware
