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#!/usr/bin/env python
#
# Collect and plot latency-profiling data from a running gpsd.
# Requires gnuplot.
#
import sys, os, time, getopt, gps, tempfile, time, socket
class Baton:
"Ship progress indication to stderr."
def __init__(self, prompt, endmsg=None):
self.stream = sys.stderr
self.stream.write(prompt + "... \010")
self.stream.flush()
self.count = 0
self.endmsg = endmsg
self.time = time.time()
return
def twirl(self, ch=None):
if self.stream is None:
return
if ch:
self.stream.write(ch)
else:
self.stream.write("-/|\\"[self.count % 4])
self.stream.write("\010")
self.count = self.count + 1
self.stream.flush()
return
def end(self, msg=None):
if msg == None:
msg = self.endmsg
if self.stream:
self.stream.write("...(%2.2f sec) %s.\n" % (time.time() - self.time, msg))
return
class uninstrumented:
"Total times wihout instrumentation, ignoring timezone skew."
name = "uninstrumented"
def header(self, fp):
fp.write("#Read\n")
fp.write("----------\n")
def formatter(self, session, fp):
fp.write("%2.6f\n" % ((time.time() - session.gps_time) % 3600,))
return True
def plot(self, file, title, session):
fmt = '''
set autoscale
set key below
set key title "Uninstrumented total latency, %s, %dN%d, cycle %ds"
plot "%s" using 0:1 title "Total time" with impulses
'''
return fmt % (title,
session.baudrate, session.stopbits, session.cycle,
file)
class rawplot:
"Print basic data, ignoring timezone skew."
name = "raw"
def header(self, fp):
fp.write("#GPS time Received Transmitted Read\n")
fp.write("#---------------- --------- ----------- ----------\n")
def formatter(self, session, fp):
fp.write("%.6f %2.6f %2.6f %2.6f # %s\n" \
% (session.rs232,
(session.recv_time - session.gps_time) % 3600,
(session.emit_time - session.gps_time) % 3600,
(time.time() - session.gps_time) % 3600,
session.tag))
return True
def plot(self, file, title, session):
fmt = '''
set autoscale
set key below
set key title "Raw latency data, %s, %dN%d, cycle %ds"
plot \
"%s" using 0:4 title "TCP/IP latency" with impulses, \
"%s" using 0:3 title "Decode time" with impulses, \
"%s" using 0:2 title "Other latency" with impulses, \
"%s" using 0:1 title "RS232 time" with impulses
'''
return fmt % (title,
session.baudrate, session.stopbits, session.cycle,
file, file, file, file)
class splitplot:
"Discard base time, use color to indicate different tags."
name = "split"
sentences = ("GPGGA", "GPRMC", "GPGLL")
def __init__(self):
self.found = {}
def header(self, fp):
fp.write("#")
for s in splitplot.sentences:
fp.write(s + " \t")
fp.write("Received Transmitted Read\n")
fp.write("#")
for s in splitplot.sentences:
fp.write("---------\t")
fp.write("--------- ----------- ----------\n")
def formatter(self, session, fp):
# Throw out total line latencies above 1 second, these are
# serial-buffering artifacts at the start of the session
line_latency = (session.recv_time - session.gps_time) % 3600
#if line_latency > session.cycle:
# return False
for s in splitplot.sentences:
if s == session.tag:
fp.write("%2.6f\t"% session.rs232)
self.found[s] = True
else:
fp.write("- \t")
fp.write("%2.6f\t%2.6f\t%2.6f\t# %s\n" \
% (line_latency,
(session.emit_time - session.gps_time) % 3600,
(time.time() - session.gps_time) % 3600,
session.tag))
return True
def plot(self, file, title, session):
fixed = '''
set autoscale
set key below
set key title "Filtered latency data, %s, %dN%d, cycle %ds"
plot \\
"%s" using 0:%d title "TCP/IP latency" with impulses, \\
"%s" using 0:%d title "Decode time" with impulses, \\
"%s" using 0:%d title "Other latency" with impulses, \\
'''
sc = len(splitplot.sentences)
fmt = fixed % (title,
session.baudrate, session.stopbits, session.cycle,
file, sc+3, file, sc+2, file, sc+1)
for i in range(sc):
if splitplot.sentences[i] in self.found:
fmt += ' "%s" using 0:%d title "%s" with impulses, \\\n' % \
(file, i+1, splitplot.sentences[i])
return fmt[:-4] + "\n"
formatters = (rawplot, splitplot, uninstrumented)
if __name__ == '__main__':
(options, arguments) = getopt.getopt(sys.argv[1:], "f:hn:o:rs:t:T:")
formatter = splitplot
raw = False
file = None
speed = 0
terminal = None
title = time.ctime()
await = 100
for (switch, val) in options:
if (switch == '-f'):
for formatter in formatters:
if formatter.name == val:
break
else:
sys.stderr.write("gpsprof: no such formatter.\n")
sys.exit(1)
elif (switch == '-n'):
await = int(val)
elif (switch == '-o'):
file = val
elif (switch == '-r'):
raw = True
elif (switch == '-s'):
speed = int(val)
elif (switch == '-t'):
title = val
elif (switch == '-T'):
terminal = val
elif (switch == '-h'):
sys.stderr.write("usage: gpsprof [-h] [-r] [-n samplecount] "
+ "[-f {" + "|".join(map(lambda x: x.name, formatters)) + "}] [-s speed] [-t title] [-o file]\n")
sys.exit(0)
plotter = formatter()
if file:
out = open(file, "w")
elif raw:
out = sys.stdout
else:
out = tempfile.NamedTemporaryFile()
try:
session = gps.gps()
except socket.error:
sys.stderr.write("gpsprof: gpsd unreachable.\n")
sys.exit(0)
try:
if speed:
session.query("b=%d" % speed)
if session.baudrate != speed:
sys.stderr.write("gpsprof: baud rate change failed.\n")
session.query("w+bc")
if formatter != uninstrumented:
session.query("z+")
#session.set_raw_hook(lambda x: sys.stdout.write(x))
plotter.header(out)
baton = Baton("gpsprof: gathering samples")
while await > 0:
session.poll()
baton.twirl()
# If timestamp is no good, skip it.
if not session.utc or session.utc == "?":
continue
session.gps_time = gps.isotime(session.utc)
session.rs232 = (session.length * (8.0+session.stopbits))/session.baudrate
if plotter.formatter(session, out):
await -= 1
baton.end()
finally:
session.query("w-z-")
out.flush()
if not raw:
command = plotter.plot(out.name, title, session)
if terminal:
command = "set terminal " + terminal + "\n" + command
pfp = os.popen("gnuplot -persist", "w")
pfp.write(command)
pfp.close()
del session
out.close()
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