gem5/util/dram_sweep_plot.py
Andreas Hansson 0756406739 mem: Add utility script to plot DRAM efficiency sweep
This patch adds basic functionality to quickly visualise the output
from the DRAM efficiency script. There are some unfortunate hacks
needed to communicate the needed information from one script to the
other, and we fall back on (ab)using the simout to do this.

As part of this patch we also trim the efficiency sweep to stop at 512
bytes as this should be sufficient for all forseeable DRAMs.
2014-09-03 07:42:29 -04:00

151 lines
5.2 KiB
Python
Executable file

#!/usr/bin/env python
# Copyright (c) 2014 ARM Limited
# All rights reserved
#
# The license below extends only to copyright in the software and shall
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# 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.
#
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# 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
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# neither the name of the copyright holders nor the names of its
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# this software without specific prior written permission.
#
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# "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,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# 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()