Revised paper.

examples/paper.py

@@ -29,8 +29,13 @@ def main() -> None:
     print()
 
     # Workload distribution.
-    grid = QuorumSystem(reads=a*b + c*d)
-    print(grid.capacity(read_fraction={0.9: 75, 0.5: 25})) # 229
+    grid = QuorumSystem(reads=a*c + b*d)
+    fr = {0.00: 10 / 18,
+          0.25: 4 / 18,
+          0.50: 2 / 18,
+          0.75: 1 / 18,
+          1.00: 1 / 18}
+    print(grid.capacity(read_fraction=fr)) # 159
     print()
 
     # f-resilient strategies.

examples/plot_workload_distribution.py

@@ -0,0 +1,51 @@
+# See https://stackoverflow.com/a/19521297/3187068
+import matplotlib
+matplotlib.use('pdf')
+font = {'size': 8}
+matplotlib.rc('font', **font)
+
+from quorums import *
+import itertools
+import matplotlib
+import matplotlib.pyplot as plt
+import numpy as np
+
+
+def main():
+    a = Node('a', write_capacity=100, read_capacity=200)
+    b = Node('b', write_capacity=100, read_capacity=200)
+    c = Node('c', write_capacity=50, read_capacity=100)
+    d = Node('d', write_capacity=50, read_capacity=100)
+    dist = {
+        0.00: 10 / 18,
+        0.25: 4 / 18,
+        0.50: 2 / 18,
+        0.75: 1 / 18,
+        1.00: 1 / 18,
+    }
+    qs = QuorumSystem(reads=a*c + b*d)
+
+    xs = np.arange(0, 1.01, 0.01)
+    markers = itertools.cycle(['o', 'v', '^', 'p', '*'])
+    fig, ax = plt.subplots(figsize=(3.25, 2.5))
+    for fr in dist.keys():
+        sigma = qs.strategy(read_fraction=fr)
+        ys = [sigma.capacity(read_fraction=x) for x in xs]
+        ax.plot(xs, ys, '--', label=str(f'$\sigma_{{{fr}}}$'), linewidth=1,
+                marker=next(markers), markevery=25, markersize=4, alpha=0.75)
+
+    sigma = qs.strategy(read_fraction=dist)
+    ys = [sigma.capacity(read_fraction=x) for x in xs]
+    ax.plot(xs, ys, label='$\sigma$', linewidth=1.5,
+            marker=next(markers), markevery=25, markersize=4)
+
+    ax.legend(ncol=3, loc='lower center', bbox_to_anchor=(0.5, 1.0))
+    ax.set_ylabel('Capacity')
+    ax.set_xlabel('Read Fraction')
+    ax.set_xticks([0, 0.25, 0.5, 0.75, 1])
+    fig.tight_layout()
+    fig.savefig(f'workload_distribution.pdf')
+
+
+if __name__ == '__main__':
+    main()