Parallel processing with FLUENT 13 and 14

msth · June 26, 2012, 22:59

I newly installed Fluent 14 but it is very slow in parallel processing.
I used Fluent 13 for running on a multicore processor but when I use same case/data files on FLUENT 14 take much longer cpu time on same processor. I run transient simulation and everything is same. Any idea what wrong is? thanks

villager · July 4, 2012, 06:01

Maybe it's some problem with mpi version or interconnect option you use? (in ansys14 by default - "mpi local parallel" instead of "mpi-hp")
Check latency between threads (cores) in 13 and 14 versions (in "parallel" menu).

msth · July 12, 2012, 15:52

You are right villager.
The mpi default version for Fluent14 is pcmpi but for Fluent13 is hp-mpi. Fluent14 doesn't have hp mpi. I checked other options for mpi in Fluernt14 but all give me much longer processing time. Does anybody know how to get hp-mpi in Fluent 14 or how to do to resolve this problem? I appreciate any help.

June 26, 2012, 22:59	Parallel processing with FLUENT 13 and 14	#1
msth New Member Join Date: Mar 2009 Posts: 7 Rep Power: 17	I newly installed Fluent 14 but it is very slow in parallel processing. I used Fluent 13 for running on a multicore processor but when I use same case/data files on FLUENT 14 take much longer cpu time on same processor. I run transient simulation and everything is same. Any idea what wrong is? thanks

July 4, 2012, 06:01		#2
villager Member vlg Join Date: Jul 2011 Location: My home :) Posts: 81 Rep Power: 18	Maybe it's some problem with mpi version or interconnect option you use? (in ansys14 by default - "mpi local parallel" instead of "mpi-hp") Check latency between threads (cores) in 13 and 14 versions (in "parallel" menu).

July 12, 2012, 15:52		#3
msth New Member Join Date: Mar 2009 Posts: 7 Rep Power: 17	You are right villager. The mpi default version for Fluent14 is pcmpi but for Fluent13 is hp-mpi. Fluent14 doesn't have hp mpi. I checked other options for mpi in Fluernt14 but all give me much longer processing time. Does anybody know how to get hp-mpi in Fluent 14 or how to do to resolve this problem? I appreciate any help.