CFD Online Logo CFD Online URL
Home > Forums > FLUENT


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

LinkBack Thread Tools Display Modes
Old   April 5, 2000, 03:55
Default IBM SP
Johan Larsson
Posts: n/a
Does anyone have any experience on running Fluent on IBM SP-machines? Are there any specific problems, is the performance satisfactory?
  Reply With Quote

Old   April 6, 2000, 02:40
Default Re: IBM SP / communication librayr vmpi
Volker Pawlik
Posts: n/a
One year ago I had some experience with Fluent on a SP-Cluster (256 Cpus) located at the Rechenzentrum ("center for calculations") of the university of Karlsruhe, Germany. (see e.g. Debis system house offers cpu-time on that cluster for industrial customers. Unfortunately the hardware is not really up to date. At first the results said that using more than 2 cpu made no sense. Later on we increased the reporting interval, which, even with a single processor, augments the performance. With a 61620 cells test-case (2eq. turbulent, isothermal) we observed a speedup of 1,75 form 1 to 2 cpus, rep interval=1 and 2,05 (2,66, 3,13) increasing the cpus from 2 to 4 (6, 8) with rep interval=5. This seems to be ok. (With a lower rep-interval the speedup decreases enormously)

Earlier version of fluent5 (UNS4.?) knew a special SP2 option for the parallel solver. I don't know why it is abandoned and what the advantage was. Maybe another communication library was used.

Conclusion: no special extraordinary problems. No extraordinary speedup compared with "normal" clustering of IBM-Workstations.

That leads me to question I: Do you know about the vmpi (vendor mpi) libraries for IBM? The users's guide says that the vmpi shall perform better than the standard ones. Unfortunately it is very difficult to get information on that vmpi for IBM (where and what must be installed, etc.) and definitely I cannot use it on my machine.

  Reply With Quote


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
Ppc64 IBM Power5 19 GHz SMP maka OpenFOAM Installation 3 November 2, 2007 17:34
Compiling and Running UDFs on an IBM Power3 S. Hollman FLUENT 0 January 6, 2005 12:23
STAR-CD, modeFRONTIER and IBM Design seminar JAN02 CD adapco Group Marketing CD-adapco 0 December 19, 2001 07:41
IBM and Fluent Volker Pawlik FLUENT 2 April 28, 2000 07:30
IBM OpenGL with GAMBIT 1.2 Volker Pawlik FLUENT 2 January 31, 2000 09:52

All times are GMT -4. The time now is 05:57.