Added node load plot script.

plot_node_loads.py

@@ -0,0 +1,37 @@
+from quorums import *
+import matplotlib
+import matplotlib.pyplot as plt
+import numpy as np
+
+def main():
+    a = Node('a', write_capacity=1000, read_capacity=10000)
+    b = Node('b', write_capacity=500, read_capacity=5000)
+    c = Node('c', write_capacity=1000, read_capacity=10000)
+    d = Node('d', write_capacity=500, read_capacity=5000)
+    e = Node('e', write_capacity=1000, read_capacity=10000)
+    f = Node('f', write_capacity=500, read_capacity=5000)
+    nodes = [a, b, c, d, e, f]
+
+    simple_majority = QuorumSystem(reads=majority([a, b, c, d, e]))
+    crumbling_walls = QuorumSystem(reads=a*b + c*d*e)
+    paths = QuorumSystem(reads=a*b + a*c*e + d*e + d*c*b)
+
+    fig, ax = plt.subplots(3, 3, figsize = (6.3 * 2, 4.8 * 2), sharey='row')
+    for i, qs in enumerate([simple_majority, crumbling_walls, paths]):
+        fr = 0.9
+        sigma = qs.strategy(read_fraction=fr)
+        sigma.plot_node_load_on(ax[0][i], nodes=nodes, read_fraction=fr)
+        sigma.plot_node_utilization_on(ax[1][i], nodes=nodes, read_fraction=fr)
+        sigma.plot_node_capacity_on(ax[2][i], nodes=nodes, read_fraction=fr)
+
+    ax[0][0].set_title('Simple Majority')
+    ax[0][1].set_title('Crumbling Walls')
+    ax[0][2].set_title('Paths')
+    ax[0][0].set_ylabel('Load')
+    ax[1][0].set_ylabel('Utilization at Peak Throughput')
+    ax[2][0].set_ylabel('Throughput at Peak Throughput')
+    fig.tight_layout()
+    fig.savefig('node_loads.pdf')
+
+if __name__ == '__main__':
+    main()