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| author | Gary E. Miller <gem@rellim.com> | 2015-05-08 18:56:53 -0700 |
|---|---|---|
| committer | Gary E. Miller <gem@rellim.com> | 2015-05-08 18:56:53 -0700 |
| commit | a5cfafa8f32fb6da2094bf4cae91f8070345771b (patch) | |
| tree | 0f4ab89c745a4700a1392db86a641be8ba23adcd /contrib/ntpshmviz | |
| parent | 955d3679ad44b8aa716fe8a35399c8316f783266 (diff) | |
| download | gpsd-a5cfafa8f32fb6da2094bf4cae91f8070345771b.tar.gz | |
Stop rounding nSec timespecs to 10 uSec. Fix divide by zero.
A timespec does not fit in a Python float. It does fit in
a Numpy float128. Stop throwing away precision!
Thanks to DrDaemonEye and Jon Schlueter <jon.schlueter@gmail.com>
Diffstat (limited to 'contrib/ntpshmviz')
| -rwxr-xr-x | contrib/ntpshmviz | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/contrib/ntpshmviz b/contrib/ntpshmviz index 17c754d4..37118d1c 100755 --- a/contrib/ntpshmviz +++ b/contrib/ntpshmviz @@ -13,6 +13,8 @@ # import gtk, stripchart, sys +# need numpy for float128, normal python floats are too small to hold a timespec +import numpy class ntpOffset: def __init__(self, stream): @@ -92,6 +94,9 @@ class ntpOffset: # gtk.Adjustment(value, lower, upper, step_incr, page_incr, # page_size) spread = self.ntp_upper[ntp_unit] - self.ntp_lower[ntp_unit] + # prevent divide by zero + if spread == 0: + spread = 1 vadj_ntp = gtk.Adjustment( self.ntp_lower[ntp_unit], # initial value self.ntp_lower[ntp_unit] - 0.001, # lower extreme @@ -128,7 +133,7 @@ class ntpOffset: if line[:1] != '#': line = line.lstrip() record = line.split(' ') - offset = (float(record[3]) - float(record[4])) + offset = numpy.float128(record[3]) - numpy.float128(record[4]) # If the NTP unit is in the dictionary # append the offset to the list @@ -137,17 +142,17 @@ class ntpOffset: if record[1] not in self.ntp_data: self.ntp_data[record[1]] = [] line_counts[record[1]] = 0 - self.ntp_upper[record[1]] = round(offset, 5) - self.ntp_lower[record[1]] = round(offset, 5) + self.ntp_upper[record[1]] = round(offset, 9) + self.ntp_lower[record[1]] = round(offset, 9) self.ntp_data[record[1]].append(offset) line_counts[record[1]] += 1 # Update the bounds of the NTP unit if needed if offset > self.ntp_upper[record[1]]: - self.ntp_upper[record[1]] = round(offset, 5) + self.ntp_upper[record[1]] = round(offset, 9) if offset < self.ntp_lower[record[1]]: - self.ntp_lower[record[1]] = round(offset, 5) + self.ntp_lower[record[1]] = round(offset, 9) # Update the max record count if needed if line_counts[record[1]] > self.lines: |