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

Distributed Parallel on dual core remote machine

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 1, 2008, 00:05
Default Distributed Parallel on dual core remote machine
  #1
Justin
Guest
 
Posts: n/a
Hi, can someone tell me how to setup the situation where I can use 1 core as a master control machine and utilise both cores on a remote machine, BUT, instead of maxing out the cores by saying I have 2 processors on it, say I have 1 processor on it, but to max out both cores during the solve?

This is that rationale, I have found that if I use distributed MPICH and select a machine this has 2 cores, it actually send 2 packets of info to that machine, the cores process the current step, send the info back and so fourth. There is a lot of communication over the network. If however I could somehow setup the run to send 1 packet of info to the remote machine, have that machine divide it up and run it on the two cores and then send the info back, this would be much fatser. How can this be done?

I have a 100 MB network and running my main machine on 2 cores (it is a 4 core CPU) and 5 remote machines on 2 cores uses upto 65% of available network overhead using Distributed MPICH. I think it would be much faster if I had to only talk to each machine once, instead of twice ( once per core )

Thanks Justin
  Reply With Quote

Old   February 3, 2008, 18:23
Default Re: Distributed Parallel on dual core remote machi
  #2
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

You cannot do what you propose.

I think you will find that for small clusters (less than 8 or 16 processors) the network does not affect the simulation speed greatly. Even if you could do what you propose, I would estimate the speedup resulting from it at around 1%-2% so it is not really worth it.

Glenn Horrocks
  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
solving a conduction problem in FLUENT using UDF Avin2407 Fluent UDF and Scheme Programming 1 March 13, 2015 03:02
Superlinear speedup in OpenFOAM 13 msrinath80 OpenFOAM Running, Solving & CFD 18 March 3, 2015 06:36
Selecting cores independently in a dual quad core machine jalarron FLUENT 1 September 7, 2009 17:06
Parallel computing on dual core Fabio FLUENT 3 July 8, 2008 05:28
Questions about CPU's: quad core, dual core, etc. Tim FLUENT 0 February 26, 2007 15:02


All times are GMT -4. The time now is 16:59.