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#!/usr/bin/env python2.6
# Copyright (c) 2010, Neville-Neil Consulting
# All rights reserved.
#
# 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 Neville-Neil Consulting 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,
# 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.
#
# Author: George V. Neville-Neil
#
# Description: This program reads a pair of PTPd quality files,
# generated with the -R option, correlates and graphs the differences
# between the time each host saw a SYNC which is an easy way to
# measure the quality of time synchronization between two clients
# a timing service.
import sys
from numpy import *
import Gnuplot, Gnuplot.funcutils
import gzip
import os
def main():
from optparse import OptionParser
parser = OptionParser()
parser.add_option("-y", "--ymin", dest="ymin", default=0,
help="minimum y value")
parser.add_option("-Y", "--ymax", dest="ymax", default=1000000,
help="maximum y value")
parser.add_option("-N", "--Names", dest="hosts", nargs=2, default=None,
help="host list for sync graph")
parser.add_option("-s", "--start", dest="start", type="int", default=0,
help="starting sequence number")
parser.add_option("-p", "--print", dest="png", default=None,
help="print the graph to a file")
parser.add_option("-o", "--output", dest="output", default=None,
help="save the correlated data to a file.")
parser.add_option("-d", "--debug", dest="debug", type="int", default=0,
help="print debugging info (verbose)")
(options, args) = parser.parse_args()
if (options.output != None):
try:
outfile = open(options.output, "w")
except:
print "cannot open %s for writing" % options.output
files = []
for filename in options.hosts:
if (os.path.splitext(filename)[1] == '.gz'):
file = gzip.open(filename)
else:
file = open(filename)
trace = {}
done = False
while not done:
try:
(seq, ts) = file.readline().split()
sequence = int(seq)
timestamp = long(ts)
except StopIteration:
done = True
except:
break
trace[sequence] = timestamp
files.append(trace)
sequences = []
sequences.append(sorted(files[0].keys()))
sequences.append(sorted(files[1].keys()))
if ((min(sequences[0]) > max(sequences[1])) or
(min(sequences[1]) > max(sequences[1]))):
print "sequences do not overlap"
sys.exit(1)
# Trim the dictionaries of non overlapping elements
index = 0
if ((min(sequences[0]) < min(sequences[1]))):
start = min(sequences[0])
end = min(sequences[1])
index = 0
else:
start = min(sequences[1])
end = min(sequences[0])
index = 1
for i in range(start, end):
del files[index][i]
if ((max(sequences[0]) > max(sequences[1]))):
start = max(sequences[1])
end = max(sequences[0])
index = 0
else:
start = max(sequences[0])
end = max(sequences[1])
index = 1
for i in range(start, end):
del files[index][i]
if options.start == 0:
options.start = min(files[0].keys())
graph = []
minimum = sys.maxint
maximum = -sys.maxint -1
for i in range(options.start,options.start + len(files[0])):
try:
delta = abs(files[1][i] - files[0][i])
except KeyError:
print "9:99:99.000900"
print "missing packet %d" % i
continue
if delta > maximum:
maximum = delta
if delta < minimum:
minimum = delta
if (options.output != None):
outfile.write(("%d %d\n" % (delta, (files[0][i] / 1000000000))))
graph.append(delta)
if (options.output != None):
outfile.close()
print "min %d, max %d" % (minimum, maximum)
# if (minimum.seconds > 1):
# print "Time difference exceeded one second maximum, " \
# "cannot graph differences"
# sys.exit(1)
plotter = Gnuplot.Gnuplot(debug=1)
if ((options.ymin != 0) or (options.ymax != 10)):
plotter.set_range('yrange', [options.ymin, options.ymax])
plotter.ylabel('Time Difference\\nNanoseconds')
plotter.xlabel('Sample Number')
plotter.plot(graph)
if (options.png != None):
plotter.hardcopy(options.png + ".png", terminal='png')
raw_input('Press return to exit')
else:
raw_input('Press return to exit')
# The canonical way to make a python module into a script.
# Remove if unnecessary.
if __name__ == "__main__":
main()
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