gem5/util/dram_sweep_plot.py

#!/usr/bin/env python

# Copyright (c) 2014 ARM Limited
# All rights reserved
#
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
# property including but not limited to intellectual property relating
# to a hardware implementation of the functionality of the software
# licensed hereunder.  You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
# unmodified and in its entirety in all distributions of the software,
# modified or unmodified, in source code or in binary form.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# Authors: Andreas Hansson

try:

    from mpl_toolkits.mplot3d import Axes3D
    from matplotlib import cm
    from matplotlib.ticker import LinearLocator, FormatStrFormatter
    import matplotlib.pyplot as plt
    import numpy as np
except ImportError:
    print "Failed to import matplotlib and numpy"
    exit(-1)

import sys
import re

# Determine the parameters of the sweep from the simout output, and
# then parse the stats and plot the 3D surface corresponding to the
# different combinations of parallel banks, and stride size, as
# generated by the config/dram/sweep.py script
def main():

    if len(sys.argv) != 2:
        print "Usage: ", sys.argv[0], " <simout directory>"
        exit(-1)

    try:
        stats = open(sys.argv[1] + '/stats.txt', 'r')
    except IOError:
        print "Failed to open ", sys.argv[1] + '/stats.txt', " for reading"
        exit(-1)

    try:
        simout = open(sys.argv[1] + '/simout', 'r')
    except IOError:
        print "Failed to open ", sys.argv[1] + '/simout', " for reading"
        exit(-1)

    # Get the burst size, number of banks and the maximum stride from
    # the simulation output
    got_sweep = False

    for line in simout:
        match = re.match("DRAM sweep with "
                         "burst: (\d+), banks: (\d+), max stride: (\d+)", line)
        if match:
            burst_size = int(match.groups(0)[0])
            banks = int(match.groups(0)[1])
            max_size = int(match.groups(0)[2])
            got_sweep = True

    simout.close()

    if not got_sweep:
        print "Failed to establish sweep details, ensure simout is up-to-date"
        exit(-1)


    # Collect the bus utilisation as our Z-axis, we do this in a 2D
    # grid corresponding to each iteration over the various stride
    # sizes.
    z = []
    zs = []
    i = 0

    # Now parse the stats
    for line in stats:
        match = re.match(".*busUtil\s+(\d+\.\d+)\s+#.*", line)
        if match:
            bus_util = float(match.groups(0)[0])
            z.append(bus_util)
            i += 1
            # If we have completed a sweep over the stride sizes,
            # start anew
            if i == max_size / burst_size:
                zs.append(z)
                z = []
                i = 0

    stats.close()

    # We should have a 2D grid with as many columns as banks
    if len(zs) != banks:
        print "Unexpected number of data points in stats output"
        exit(-1)

    fig = plt.figure()
    ax = fig.gca(projection='3d')
    X = np.arange(burst_size, max_size + 1, burst_size)
    Y = np.arange(1, banks + 1, 1)
    X, Y = np.meshgrid(X, Y)

    # the values in the util are banks major, so we see groups for each
    # stride size in order
    Z = np.array(zs)

    surf = ax.plot_surface(X, Y, Z, rstride=1, cstride=1, cmap=cm.coolwarm,
                           linewidth=0, antialiased=False)

    # Change the tick frequency to 64
    start, end = ax.get_xlim()
    ax.xaxis.set_ticks(np.arange(start, end + 1, 64))

    ax.set_xlabel('Bytes per activate')
    ax.set_ylabel('Banks')
    ax.set_zlabel('Efficiency (%)')

    # Add a colorbar
    fig.colorbar(surf, shrink=0.5, pad=.1, aspect=10)

    plt.show()

if __name__ == "__main__":
    main()