CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

require info on Itanium processor

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   September 24, 2009, 01:56
Default require info on Itanium processor
  #1
jai
Member
 
jaikrishna
Join Date: Mar 2009
Location: chennai
Posts: 56
Rep Power: 8
jai is on a distinguished road
how Itanium processor differ from other processor for solving cfd problem?

if suppose my processor is intel xeon/AMD, i need 4 processor to solve the problem of 5 million elements..

if suppose my processor is intel Itanium i need only 2 processor to solve the problem of 5 million elements..

Is these correct? how many no of processor require to solve the same problem with Itanium processor?
jai is offline   Reply With Quote

Old   September 24, 2009, 06:45
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,805
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
If you are using a 64 bit operating system then the things which limit the size problem you can do is:
1) Memory - you need enough memory to fit it in. This can be either in one machine or distributed across a cluster, either is OK.
2) Patience - big problems take longer to run. Faster CPUs help but when you start approaching mesh convergence for most engineering simulations you are frequently looking at runs taking days to weeks to complete. Again clusters help here by speeding the solution time.
ghorrocks is offline   Reply With Quote

Old   September 25, 2009, 06:24
Default
  #3
jai
Member
 
jaikrishna
Join Date: Mar 2009
Location: chennai
Posts: 56
Rep Power: 8
jai is on a distinguished road
dear sir
for solving 10 million elements Ansys suguessted to have 16 processor and 64GB of RAM.
now i'm looking for a server and i came to know that deploying cluster computing is more convenient instead of buying a single server.
Is it true? i hope this true from your above statement.
if i'm going for cluster computing means i have to buy 2 server (each consists of 8 processors) and i've more doubt on this netwoking...
1. whether i've to install cfx in all machines or not...
Is i have to buy any other software for clustering and solving..
pls explain the cluster setup in details
jai is offline   Reply With Quote

Old   September 25, 2009, 06:42
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,805
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
The recommendation for ANSYS is for FEA structural analysis. This has very little in common with CFD so cannot be used as a basis for sizing your computing requirements.

Clusters have better performance than single server/multi CPU/multi-core systems. This is because you get better parallel speedup in distributed parallel than local parallel.

If you are looking at performance versus dollars then the best option is to get a cluster of the W55xx CPUs, with only one CPU per machine and only running about 2 processes per machine. This means half the CPU cores are sitting idle. As the cost of the machines is small compared to the cost of the licenses the best return on investment is to do this, even though it seems wasteful.

Regardless as to whether you do local parallel or distributed parallel the licensing cost is the same. There is a little more setup in distributed parallel but it is well documented and support (and the forum!) can help you up and running.
ghorrocks is offline   Reply With Quote

Old   October 1, 2009, 02:58
Default
  #5
jai
Member
 
jaikrishna
Join Date: Mar 2009
Location: chennai
Posts: 56
Rep Power: 8
jai is on a distinguished road
Dear sir
i plan to buy 4 nodes, each consists of 8 processors and 2GB RAM per processor.
therefore my cluster has 32 processors and 64 GB of RAM.
so i plan to run only on 16 processors out of 32 processor to obtain best performance...
for these things, how many number of parallel licenses i have to buy?

if i'll get 16 licenses from ansys means, whether i've provision in CFX or windows server 2008 or HPC server to use only 4 processors out of 8 processors in a node ?
jai is offline   Reply With Quote

Old   October 1, 2009, 07:03
Default
  #6
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,805
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
You will need 16 parallel licenses. You can tell each process which machine to go to so you can split the job up as you describe.

You are proposing quite a significant investment. I recommend you organise some trial licenses from ANSYS and some test hardware from your computer supplier so you can benchmark these systems for yourself. This way you can optimise the system before you spend cash - and also make sure you don't buy a lemon.

I was fortunate enough a few years ago to hire a system as a trial before I purchased it. It turned out the system only ran half as fast as expected because the system had a poor quality PCI controller chip on the motherboard. I would never have guessed it would have been a problem from the specifications or benchmarks. The trial saved me buying a lemon (4 of them in a mini-cluster actually). So for any reasonable sized purchase I recommend you benchmark the system before purchase.
ghorrocks is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Superlinear speedup in OpenFOAM 13 msrinath80 OpenFOAM Running, Solving & CFD 18 March 3, 2015 06:36
CFX11 + Fortran compiler ? Mohan CFX 20 March 30, 2011 18:56
DecomposePar unequal number of shared faces maka OpenFOAM Pre-Processing 6 August 12, 2010 09:01
Unaligned accesses on IA64 andre OpenFOAM 5 June 23, 2008 10:37
OpenFOAM with Cygwin kitchener OpenFOAM Installation 6 April 24, 2006 23:09


All times are GMT -4. The time now is 20:16.