Escali 4.4 사용자 설명서

Section: 3.3 Running Scali MPI Connect programs

The Power series processors (PowerPC, POWER4 and POWER5)  are both 32 and 64 bit capable. 
There are only 64 bit versions of Linux provided by SUSE and RedHat, and only a 64 bit OS is 
supported by Scali. However the Power families are capable of running 32 bit programs at full 
speed while running a 64 bit OS. For this reason Scali supports running both 32 bit and 64 bit 
MPI programs.

Note that gcc default compiles 32 bit on Power, use the the gcc/g77 flags -m32 and -m64 to 
explicitly select code generation.

The PowerPC and POWER4/5 have a common core instruction set but different extensions, be 
sure to read the specifics in the documentation on the compilers code generations flags for 
optimal performance.

It is not possible to link 32 and 64 bit object code into one executable, (no cross dynamic linking 
either) so there must be double set of libraries. It is common convention on ppc64 systems 
that all 32 bit libraries are placed in lib directories  and all 64 bit libraries in lib64. This means 

that when linking a 64 bit application with Scali MPI, you must use the -L$MPI_HOME/lib64 

argument instead of the normal -L$MPI_HOME/lib.

To compile and link with the Scali MPI-IO features you need to do the following depending on 
whether it is a C or a Fortran program:

For C programs mpio.h must be included in your program and you must link with the libmpio 

shared library in addition to the Scali MPI 1.2 C shared library (libmpi):

<CC> <program>.o -I/opt/scali/inlude -L/opt/scali/lib -lmpio -lmpi -o <program>

For Fortran programs you will need to include mpiof.h in your program and link with the 
libmpio shared library in addition to the Scali MPI 1.2 C and Fortran shared libraries:

<F77> <program>.o -I/opt/scali/include -L/opt/scali/lib -lmpio -lmpif -lmpi -o 
<program>

Note that executables issuing SMC calls cannot be started directly from a shell prompt. SMC 
programs can either be started using the MPI monitor program mpimon, the wrapper script 
mpirun, or from the Scali Manage GUI [See Scali Manage User Guide for details]. 

When an application program is started, Scali MPI Connect is modifying the program name 
argv[0] to help in identifying the instances. The following convention is used for the 
executable, reported on the command line using the Unix utility ps: 

<userprogram>-<rank number>(mpi:<pid>@<nodename>)

where:

<userprogram> 

is the name of the application program.

<rank number> 

is the application’s MPI-process rank number.