POISSON_BAND2 - Master process:
  A FORTRAN 90 program to solve the Poisson equation.
  The MPI message passing library is used.
 
  This version used NONBLOCKING communication
  with MPI_Isend and MPI_Irecv.
 
  The number of interior X grid lines is      9
  The number of interior Y grid lines is      9
 
  The number of processes is   4
 
  Process   0 is active
  Process   1 is active
  Process   3 is active
  Process   2 is active
 
INIT_BAND - Master Cartesian process:
  The X grid spacing is   0.100000    
  The Y grid spacing is   0.100000    
 
INIT_BAND - Master Cartesian process:
  Max norm of boundary values =   0.841471    
 
POISSON_BAND2 - Master Cartesian process:
  Max norm of right hand side F at interior nodes =    1.17335    
 
Step    ||U||         ||Unew||     ||Unew-U||
 
     1  0.403397      0.497847      0.144939    
     2  0.570316      0.604994      0.631442E-01
     3  0.634317      0.651963      0.422323E-01
     4  0.667575      0.678126      0.308531E-01
     5  0.687708      0.694657      0.230252E-01
     6  0.701077      0.705958      0.185731E-01
     7  0.710522      0.714112      0.154310E-01
     8  0.717499      0.720232      0.131014E-01
     9  0.722829      0.724966      0.111637E-01
    10  0.727009      0.728716      0.955927E-02
    11  0.730356      0.731745      0.825886E-02
    12  0.733083      0.734229      0.726876E-02
    13  0.735336      0.736293      0.641227E-02
    14  0.737221      0.738029      0.574046E-02
    15  0.738814      0.739502      0.514485E-02
    16  0.740172      0.740762      0.461456E-02
    17  0.741339      0.741849      0.414240E-02
    18  0.742348      0.742791      0.372159E-02
    19  0.743225      0.743613      0.334623E-02
    20  0.743993      0.744333      0.301093E-02
    21  0.744667      0.744967      0.271106E-02
    22  0.745261      0.745526      0.244254E-02
    23  0.745787      0.746022      0.220177E-02
    24  0.746254      0.746463      0.198561E-02
    25  0.746669      0.746855      0.179145E-02
    26  0.747039      0.747205      0.161681E-02
    27  0.747369      0.747518      0.145966E-02
    28  0.747665      0.747799      0.131977E-02
    29  0.747930      0.748050      0.119373E-02
    30  0.748168      0.748276      0.107974E-02
    31  0.748382      0.748479      0.976652E-03
 
POISSON_BAND2 - Master process:
  The iteration has converged
 
POISSON_BAND2 - Master process:
  Normal end of execution.