DragonFly On-Line Manual Pages

Search: Section:  

MPE_Open_graphics(4)                  MPE                 MPE_Open_graphics(4)


MPE_Open_graphics - (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;


comm - Communicator of participating processes display - Name of X window display. If NULL, display will be taken from the local DISPLAY variable on each process. If the local DISPLAY is undefined, the DISPLAY variable of the process with rank 0 in 'comm' will be used. If that is either undefined then the value of display is ``hostname``:0, or if it starts with w ":xy", then the value of display is ``hostname``:xy. 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.


handle - 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).


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.


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.


4/2/2012 MPE_Open_graphics(4)

Search: Section: