(collectively) opens an X Windows display


#include "mpe.h" 
int MPE_Open_graphics( handle, comm, display, x, y, w, h, is_collective )
MPE_XGraph *handle;
MPI_Comm   comm;
char       display[MPI_MAX_PROCESSOR_NAME+4];
int        x, y;
int        w, h;
int        is_collective;

Input Parameters

comm Communicator of participating processes
display Name of X window display. If null, display will be taken from the DISPLAY variable on the process with rank 0 in comm. If that is either undefined, or starts with w ":", then the value of display is `hostname`:0
x,y position of the window. If (-1,-1), then the user should be asked to position the window (this is a window manager issue).
w,h width and height of the window, in pixels.
is_collective true if the graphics operations are collective; this allows the MPE graphics operations to make fewer connections to the display. If false, then all processes in the communicator comm will open the display; this could exceed the number of connections that your X window server allows. Not yet implemented.

Output Parameter

Graphics handle to be given to other MPE graphics routines.


This is a collective routine. All processes in the given communicator must call it, and it has the same semantics as MPI_Barrier (that is, other collective operations can not cross this routine).

Notes For Fortran Interface

The Fortran interface to this routine is different from its C counterpart and it has an additional argument, ierr, at the end of the argument list, i.e. the returned function value (the error code) in C interface is returned as the additional argument in Fortran interface. The Fortran interface is invoked with the CALL statement.

All MPI and MPE objects, MPI_Comm, MPE_XGraph and MPE_Color, are of type INTEGER in Fortran.

Additional Notes for Fortran Interface

If Fortran display argument is an empty string, "", display will be taken from the DISPLAY variable on the process with rank 0 in comm. The trailing blanks in Fortran CHARACTER string argument will be ignored.