quoracle/examples/plot_workload_distribution.py

# See https://stackoverflow.com/a/19521297/3187068
import matplotlib
matplotlib.use('pdf')
font = {'size': 8}
matplotlib.rc('font', **font)

from quoracle 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 (commands per second)')
    ax.set_xlabel('Read Fraction')
    ax.set_xticks([0, 0.25, 0.5, 0.75, 1])
    ax.grid()
    fig.tight_layout()
    fig.savefig(f'workload_distribution.pdf')


if __name__ == '__main__':
    main()