Dryad Graph

[theodore5]

Good morning.

I have this graph code in dryad:

GraphBuilder XSet = moduleX^N;
GraphBuilder DSet = moduleD^N;
GraphBuilder MSet = moduleM^(N_4) ;
GraphBuilder SSet = moduleS ^(N_4) ;
GraphBuilder YSet = moduleY^N;
GraphBuilder HSet = moduleH ^ 1 ;
GraphBuilder XInput s = ( u g r i z 1 >= XSet ) || ( n e i g h b o r >= XSet ) ;
GraphBuilder YInput s = u g r i z 2 >= YSet ;
GraphBuilder XToY = XSet >= DSet >> MSet >= SSet ;
f r ( i = 0 ; i < N*4; ++i )

XToY = XToY || ( SSet . Ge tVe r t e x ( i ) >= YSet . Ge tVe r t e x ( i /4) ) ;

GraphBuilder YToH = YSet >= HSet ;
GraphBuilder HOutputs = HSet >= output ;
GraphBuilder final = XInput s || YInput s || XToY || YToH ||HOutputs ;

Also, in the paper http://research.microsoft.com/en-us/projects/dryadlinq/eurosys07.pdf there is the graph in page 4 that corresponds to the code. In all presentations that exist for DryadLinQ, I see this code but none of them says exactly what "module" is exactly and where it is defined. I would like a further explanation on this. Also,

1. I cannot find documentation on dryad Graph API, something that describes explicitly what VP base class is, where to write programs with the above kind of operators and all the commands and operators inside this C++ library to construct a dryad graph. I suppose "module" exists there and there is a further explanation for this datatype.

2. I cannot find a presentation where a dryadLinq code is explicitly mapped to the graph. I want an example in dryadLINQ code that maps every variable or every step of the code to the graph execution, in order to understand completely how dryadLINQ transforms the code into graph.

3. I would like a presentation concerning how to write parallel programs with Dryad but not DryadLINQ