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

Clusters on linux: PVM vs. HP MPI

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 2, 2006, 11:09
Default Clusters on linux: PVM vs. HP MPI
  #1
Alexey
Guest
 
Posts: n/a
In last volume of "ansys solutions" there is the article about advantages of HP MPI. Ansys CFX-10.0 (for linux) includs HP MPI support. Are there any test results or recomendations?
  Reply With Quote

Old   February 2, 2006, 11:23
Default Re: Clusters on linux: PVM vs. HP MPI
  #2
Stevie Wonder
Guest
 
Posts: n/a
You can use HP-MPI on CFX-10. It works pretty well. But I'm not sure if it's already faster than PVM.

Regards, S. W.
  Reply With Quote

Old   February 3, 2006, 10:26
Default Re: Clusters on linux: PVM vs. HP MPI
  #3
Jeff
Guest
 
Posts: n/a
The advantage of HP-MPI is that it uses the Myrinet connection between nodes (1Gb) rather than standard TCP (100 Mb). Parallel runs have to communicate between the partitions and using Myrinet speeds up that communication.

That being said, I have found that if the problem is not already communication limited, HP-MPI using Myrinet is slightly slower than standard MPI over TCP. I believe the benefit will come when you subdivide beyond 1 partition per 500K nodes. Normally MPI will start to "tail off" in efficiency beyond this point. HP-MPI should delay the tail-off effect until a much higher partition level. I haven't verified this however.

Jeff
  Reply With Quote

Old   February 3, 2006, 11:11
Default Re: Clusters on linux: PVM vs. HP MPI
  #4
Pete
Guest
 
Posts: n/a
Hi Jeff.... Is your comment valid for SGI-Altix-MPI as well?
  Reply With Quote

Old   February 8, 2006, 11:33
Default Re: Clusters on linux: PVM vs. HP MPI
  #5
Steve
Guest
 
Posts: n/a
Jeff- First, use of Myrinet requires Myrinet hardware. HP-MPI isn't magically going to use Myrinet if all you have is an ethernet connection between the nodes in your cluster. Whether you have 100Mb "fast" ethernet or 1Gb Gigabit ethernet, you still have to use TCP because its ethernet. You are mixing up hardware (Myrinet vs ethernet) with software (HP-MPI vs PVM).
  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
Sgimpi pere OpenFOAM 27 September 24, 2011 07:57
Dual Boot Windows and Linux and Go Open Source andyj Main CFD Forum 2 October 21, 2010 16:49
Error using LaunderGibsonRSTM on SGI ALTIX 4700 jaswi OpenFOAM 2 April 29, 2008 10:54
Is Testsuite on the way or not lakeat OpenFOAM Installation 6 April 28, 2008 11:12
Parallel Fluent on Linux clusters Chengwang Lei FLUENT 3 November 24, 2004 03:05


All times are GMT -4. The time now is 03:38.