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Linux Forum Index » Linux Hardware » single core high performance computing/max memory?...
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| Anton Ertl... |
 Posted: Tue Jul 01, 2008 8:05 am |
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Aragorn <aragorn at (no spam) chatfactory.invalid> writes:
Quote: On Monday 30 June 2008 18:15, someone who identifies as *Anton Ertl* wrote
in /comp.os.linux.hardware:/
[About Opterons:]
[...] Also, if you want 32GB, it may be cheaper to equip both sockets of a
dual-core board to get two additional memory channels than to try to do it
with one Opteron (and forget about single-socket Opteron boards, they
don't have enough memory slots).
Sorry Anton, but the current batch[1] of Intel processors still uses a
Northbridge and a single on-motherboard memory controller.
Sorry if it was not clear that I meant Opterons with the statement above.
Quote: It'll support
dual-channel memory access, yes, but it won't add another memory channel if
you have two or more sockets.
Actually, you can buy dual-socket Xeon boards with four (FB-DIMM)
channels; I don't think anybody builds single-socket boards with these
memory controllers. But of course with Xeons you don't get additional
memory controllers by equiping both sockets, so if you need only one
core, there is no reason to equip both sockets.
- anton
--
M. Anton Ertl Some things have to be seen to be believed
anton at (no spam) mips.complang.tuwien.ac.at Most things have to be believed to be seen
http://www.complang.tuwien.ac.at/anton/home.html |
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| Gary Seven... |
| Posted: Tue Jul 01, 2008 12:07 pm |
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Chris <me at (no spam) privacy.net> wrote:
: Hi,
: I'm looking for a high performance computing environment for
: genetic analysis. As far as I understood, as well Opterons as
: Xeons can only address 4GB of main memory per core. Is this
: right?
: Looking for alternate platfoms, I came across the IBM Power
: 520 Express
: (http://www-03.ibm.com/systems/power/hardware/520/), which is
: capable of addressing up to 16GB as a single core system.
: Furthermore, it runs linux, and should therefore be able to
: compile and run common gentic analysis software such as plink
: (http://pngu.mgh.harvard.edu/~purcell/plink/) or birdsuite
: (http://www.broad.mit.edu/mpg/birdsuite/).
: Did anyone ever try this before?
: Recommedations, please!
: Thx,
: Chris
This would be a great question to post over at "comp.arch".
G7 |
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| Robert Redelmeier... |
| Posted: Sun Jul 06, 2008 12:12 am |
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In comp.sys.ibm.pc.hardware.chips Chris <me at (no spam) privacy.net> wrote in part:
Quote: I'm looking for a high performance computing environment
for genetic analysis. As far as I understood, as
well Opterons as Xeons can only address 4GB of main
memory per core. Is this right?
No, it is very dated. For about 10 years, x86 CPUs have
had the capability of addressing far more than 4 GB. 64 GB
at least with PAE and 1 TB with x86_64. The problem is most
motherboards have much smaller capabilities.
The 4 GB limit applies per _process_ on a 32-bit OS.
A good 32 bit OS can handle multiple 4 GB processes.
But for your app (presumably some sort of pattern search),
you are probably best going with x86_64 where you get 48
bit virtual addresses and ~40 bit physical as well as the
64 bit ops. Linux is very available for x86_64, and it is
getting difficult to find any PC without x86_64 capabilities.
-- Robert |
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