GraphIt is an actively used programming language created in 2017. GraphIt is a new DSL for graph computations that generates fast implementations for algorithms with different performance characteristics running on graphs with different sizes and structures. GraphIt separates what is computed (algorithm) from how it is computed (schedule). Programmers specify the algorithm using an algorithm language, and performance optimizations are specified using a separate scheduling language. The scheduling language enables programmers to easily search through this complicated tradeoff space by composing together a large set of edge traversal and vertex data layout optimizations.

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### Example code from the web:

```element Vertex end
element Edge end
const edges : edgeset{Edge}(Vertex,Vertex) = load (argv);
const vertices : vertexset{Vertex} = edges.getVertices();
const old_rank : vector{Vertex}(double) = 1.0/vertices.size();
const new_rank : vector{Vertex}(double) = 0.0;
const out_degree : vector {Vertex}(int) = edges.getOutDegrees();
const contrib : vector{Vertex}(double) = 0.0;
const error : vector{Vertex}(double) = 0.0;
const damp : double = 0.85;
const beta_score : double = (1.0 - damp) / vertices.size();

func computeContrib(v : Vertex)
contrib[v] = old_rank[v] / out_degree[v];
end

func updateEdge(src : Vertex, dst : Vertex)
new_rank[dst] += contrib[src];
end

func updateVertex(v : Vertex)
var old_score : double = old_rank[v];
new_rank[v] = beta_score + damp*(new_rank[v]);
error[v] = fabs(new_rank[v] - old_rank[v]);
old_rank[v] = new_rank[v];
new_rank[v] = 0.0;
end

func printRank(v : Vertex)
print old_rank[v];
end

func reset(v: Vertex)
old_rank[v] = 1.0/vertices.size();
new_rank[v] = 0.0;
end

func main()
for trail in 0:10
startTimer();
vertices.apply(reset);
for i in 0:20
vertices.apply(computeContrib);
#s1# edges.apply(updateEdge);
vertices.apply(updateVertex);
end

var elapsed_time : double = stopTimer();
print "elapsed time: ";
print elapsed_time;
end
end

% specify schedules here or use a separate schedule file```

Last updated January 25th, 2020

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