%% demo2.pl -- Stasinos Konstantopoulos
%% konstant@let.rug.nl, Tue Feb 12 2002
%%
%% This the calculation that needs to be performed, in this case
%% the sum of [From..To]
calc( From, From, Acc, Res ) :- !,
Res is Acc + From.
calc( From, To, Acc, Res ) :- !,
Acc1 is Acc + To,
To1 is To - 1,
calc( From, To1, Acc1, Res ).
%% We'll pretend the preprocessing was more complicated, and have the
%% root broadcast how many numbers each processor should do.
%% Each processor must then figure out which ones to do and call calc/4.
do(0, Num) :-
!,
mpe_create_event(Ev1),
mpe_create_event(Ev2),
format( "Ev1 == ~q, Ev2 == ~q~n", [Ev1,Ev2] ),
mpe_create_state(Ev1,Ev2,state1,red),
format( "1 AA~n", [] ),
mpe_log(Ev1,0,event1),
format( "2 AA~n", [] ),
mpi_bcast( Num, 0, 100 ),
format( 'Proc 0: broadcast ~q.~n', [Num] ),
mpe_log(Ev2,0,event2).
do(Rank, _) :-
format( 'Proc ~q: had ~q broadcast from 0.~n', [Rank, Num] ),
%% This is the entry point
start(Msg) :-
mpi_open( Rank, NumProc, ProcName ),
format( 'Rank: ~q NumProc: ~q, ProcName: ~q~n', [Rank,NumProc,ProcName] ),
mpe_open,
do(Rank, Msg),
format( 'Rank ~q finished!~n', [Rank] ),
mpe_close( demo2 ).
