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fix write optimization in update_many #81

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merged 2 commits into from Aug 26, 2014
Merged

fix write optimization in update_many #81

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2976081
fix write optimization in update_many
timob Jun 11, 2014
8b3ebba
reduce len calls in update_many
timob Jun 12, 2014
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8 changes: 6 additions & 2 deletions whisper.py
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Expand Up @@ -650,12 +650,16 @@ def __archive_update_many(fh,header,archive,points):
step = archive['secondsPerPoint']
alignedPoints = [ (timestamp - (timestamp % step), value)
for (timestamp,value) in points ]
alignedPoints = dict(alignedPoints).items() # Take the last val of duplicates
#Create a packed string for each contiguous sequence of points
packedStrings = []
previousInterval = None
currentString = ""
for (interval,value) in alignedPoints:
lenAlignedPoints = len(alignedPoints)
for i in xrange(0,lenAlignedPoints):
#take last point in run of points with duplicate intervals
if i+1 < lenAlignedPoints and alignedPoints[i][0] == alignedPoints[i+1][0]:
continue
(interval,value) = alignedPoints[i]
if (not previousInterval) or (interval == previousInterval + step):
currentString += struct.pack(pointFormat,interval,value)
previousInterval = interval
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