Ansys Fluent 32 Bit
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ANSYS FLUENT 12.0 User's Guide - 32.4.1 Starting Parallel ANSYS FLUENT on a Linux/UNIX System Using Command Line Options To start the parallel version of ANSYS FLUENT using command line options, you can use the following syntax in a command prompt window: fluent version -t nprocs -p interconnect -mpi= mpitype -cnf= hostsfile where. version must be replaced by the version of ANSYS FLUENT you want to run ( 2d, 3d, 2ddp, or 3ddp).p interconnect (optional) specifies the type of interconnect. The ethernet interconnect is used by default if the option is not explicitly specified. See Table, Table, and Table for more information.mpi= mpitype (optional) specifies the type of MPI. If the option is not specified, the default MPI for the given interconnect will be used (the use of the default MPI is recommended).
The available MPIs for Linux/UNIX are shown in Table.cnf= hostsfile specifies the hosts file, which contains a list of the computers on which you want to run the parallel job. If the hosts file is not located in the directory where you are typing the startup command, you will need to supply the full pathname to the file. You can use a plain text editor to create the hosts file. The only restriction on the filename is that there should be no spaces in it.
For example, hosts.txt is an acceptable hosts file name, but my hosts.txt is not. Your hosts file (e.g., hosts.txt) might contain the following entries: computer1 computer2 The last entry must be followed by a blank line.
If a computer in the network is a multiprocessor, you can list it more than once. For example, if computer1 has 2 CPUs, then, to take advantage of both CPUs, the hosts.txt file should list computer1 twice: computer1 computer1 computer2.t nprocs specifies the number of processes to use. When the -cnf option is present, the hostsfile argument is used to determine which computers to use for the parallel job. For example, if there are 10 computers listed in the hosts file and you want to run a job with 5 processes, set nprocs to 5 (i.e., -t5) and ANSYS FLUENT will use the first 5 machines listed in the hosts file. For example, to use the Infiniband interconnect, and to start the 3D solver with 4 compute nodes on the machines defined in the text file called fluent.hosts, you can enter the following in the command prompt: fluent 3d -t4 -pinfiniband -cnf=fluent.hosts Note that if the optional -cnf= hostsfile is specified, a compute node will be spawned on each machine listed in the file hostsfile.
(If you enter this optional argument, do not include the square brackets.) Also, ANSYS FLUENT provides a fault-tolerance feature on Infiniband Linux clusters running OFED. To invoke this feature, use the command line flag -pinfiniband.ofedft (or -pib.ofedft) which enables transparent port fail-over and high-availability features using HP-MPI.
Note that while the simulations proceed more robustly with this option, there may be some degradation in performance. The supported interconnects for parallel Linux/UNIX machines are listed below (Table, Table, and Table ), along with their associated communication libraries, the corresponding syntax, and the supported architectures.
64-bit
Table 32.4.1: Supported Interconnects for Linux/UNIX Platforms (Per Platform) Platform Processor Architecture Interconnects/Systems. Linux 32-bit 64-bit 64-bit Itanium lnx86 lnamd64 lnia64 ethernet, infiniband, myrinet ethernet, infiniband, myrinet ethernet, infiniband, myrinet, altix Sun 64-bit ultra64 vendor. (default), ethernet HP 64-bit Itanium hpux11ia64 vendor. (default), ethernet IBM 64-bit aix5164 vendor.
(default), ethernet (.) Node processes on the same machine communicate by shared memory. ANSYS FLUENT lets the MPI autoselect the best interconnect available on the system. Users can specify an interconnect to override that selection. Ethernet is the fallback choice. (.) vendor indicates a proprietary vendor interconnect.
The specific proprietary interconnects that are supported are dictated by those that the vendor's MPI supports. Table 32.4.2: Available MPIs for Linux/UNIX Platforms MPI Syntax (flag) Communication Library Notes hp -mpi=hp HP MPI General purpose for SMPs and clusters intel -mpi=intel Intel MPI General purpose for SMPs and clusters mpich2 -mpi=mpich2 MPICH2 For both SMPs and Ethernet clusters (UNIX only) sgi -mpi=sgi SGI MPI for Altix Only for SGI Altix systems (SMP); must start ANSYS FLUENT on a system where parallel node processes are to run vendor -mpi=vendor Vendor MPI openmpi -mpi=openmpi Open MPI Open source MPI-2 implementation.
For both SMPs and clusters. Table 32.4.3: Supported MPIs for Linux/UNIX Architectures (Per Interconnect) Architecture Ethernet Myrinet. Infiniband Proprietary Systems lnx86 hp (default), mpich2 hp hp - lnamd64 hp (default), intel hp (default), openmpi hp (default), intel, and openmpi - lnia64 hp (default), intel hp hp (default), intel sgi aix5164 vendor (default), openmpi -vendor hpux11ia64 vendor (default) -vendor ultra64 vendor (default) -vendor (.) Both MX and GM Myrinet protocols are supported. ANSYS FLUENT will automatically detect which type is running on the system and will use that particular protocol. You only have to supply the -pmyrinet option. If the hardware supports it, the installation and usage of Myrinet MX is recommended (please consult your Myrinet vendor for applicability). Previous: Up: Next: Release 12.0 © 2009-01-29.