scripts/assumptions_check.py

import sys

import texttable as TT

import numpy as np
import matplotlib.pyplot as plt
from numpy.polynomial.chebyshev import chebfit, chebval

from .io_results_loader import load_data, filter_data
from .statistic import approximate_line, difference


def linearity_table(data, types, vals):
    """ create table by pyplot with diferences
        between original and approximated
        vals - values to make line"""
    fields = 'blocksize_b', 'iops_mediana'
    for tp in types:
        filtered_data = filter_data('linearity_test_' + tp, fields)
        # all values
        x = []
        y = []
        # values to make line
        ax = []
        ay = []

        for sz, med in sorted(filtered_data(data)):
            iotime_ms = 1000. // med
            x.append(sz / 1024.0)
            y.append(iotime_ms)
            if sz in vals:
                ax.append(sz / 1024.0)
                ay.append(iotime_ms)

        ynew = approximate_line(ax, ay, x, True)

        dif, _, _ = difference(y, ynew)
        table_data = []
        for i, d in zip(x, dif):
            row = ["{0:.1f}".format(i), "{0:.1f}".format(d[0]), "{0:.0f}".format(d[1]*100)]
            table_data.append(row)

        tab = TT.Texttable()
        tab.set_deco(tab.VLINES)

        header = ["BlockSize, kB", "Absolute difference (ms)", "Relative difference (%)"]
        tab.add_row(header)
        tab.header = header

        for row in table_data:
            tab.add_row(row)

        # uncomment to get table in pretty pictures :)
        # colLabels = ("BlockSize, kB", "Absolute difference (ms)", "Relative difference (%)")
        # fig = plt.figure()
        # ax = fig.add_subplot(111)
        # ax.axis('off')
        # #do the table
        # the_table = ax.table(cellText=table_data,
        #           colLabels=colLabels,
        #           loc='center')
        # plt.savefig(tp+".png")


def th_plot(data, tt):
    fields = 'concurence', 'iops_mediana', 'lat_mediana'
    conc_4k = filter_data('concurrence_test_' + tt, fields, blocksize='4k')
    filtered_data = sorted(list(conc_4k(data)))

    x, iops, lat = zip(*filtered_data)

    _, ax1 = plt.subplots()

    xnew = np.linspace(min(x), max(x), 50)
    # plt.plot(xnew, power_smooth, 'b-', label='iops')
    ax1.plot(x, iops, 'b*')

    for degree in (3,):
        c = chebfit(x, iops, degree)
        vals = chebval(xnew, c)
        ax1.plot(xnew, vals, 'g--')

    # ax1.set_xlabel('thread count')
    # ax1.set_ylabel('iops')

    # ax2 = ax1.twinx()
    # lat = [i / 1000 for i in lat]
    # ax2.plot(x, lat, 'r*')

    # tck = splrep(x, lat, s=0.0)
    # power_smooth = splev(xnew, tck)
    # ax2.plot(xnew, power_smooth, 'r-', label='lat')

    # xp = xnew[0]
    # yp = power_smooth[0]
    # for _x, _y in zip(xnew[1:], power_smooth[1:]):
    #     if _y >= 100:
    #         xres = (_y - 100.) / (_y - yp) * (_x - xp) + xp
    #         ax2.plot([xres, xres], [min(power_smooth), max(power_smooth)], 'g--')
    #         break
    #     xp = _x
    #     yp = _y

    # ax2.plot([min(x), max(x)], [20, 20], 'g--')
    # ax2.plot([min(x), max(x)], [100, 100], 'g--')

    # ax2.set_ylabel("lat ms")
    # plt.legend(loc=2)


def main(argv):
    data = list(load_data(open(argv[1]).read()))
    linearity_table(data, ["rwd", "rws", "rrd"], [4096, 4096*1024])
    # linearity_plot(data, ["rwd", "rws", "rrd"])#, [4096, 4096*1024])
    # linearity_plot(data, ["rws", "rwd"])
    # th_plot(data, 'rws')
    # th_plot(data, 'rrs')
    plt.show()


if __name__ == "__main__":
    exit(main(sys.argv))