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39 lines
1.2 KiB
Python
39 lines
1.2 KiB
Python
from time import time
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DATARATE_UPDATE = 1.0 # Time slice (in second) for datarate computation
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class DataRate:
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"""
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Compute average speed in bits per second of a function.
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Store self.size data rates to compute good average speed.
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Don't compute average before self.min_size values are computed.
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"""
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def __init__(self, offset, size=20, min_size=3):
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self.last_offset = offset
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self.last_time = time()
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self.datarates = []
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# Average bit rate
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self.average = None
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# Number of stored value used to compute average data rate
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self.size = size
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self.min_size = min_size
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def update(self, offset):
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# Compute time delta
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difftime = time() - self.last_time
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if difftime < DATARATE_UPDATE:
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# Only update each second
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return
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self.last_time = time()
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# Compute data rate
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rate = float(offset - self.last_offset) / difftime
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self.last_offset = offset
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# Update statistics
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self.datarates.append(rate)
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self.datarates = self.datarates[-self.size:]
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if self.min_size <= len(self.datarates):
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self.average = sum(self.datarates) / len(self.datarates)
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