45 lines
1.3 KiB
Python
45 lines
1.3 KiB
Python
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#!/usr/bin/env python3
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import sys
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import json
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import base64
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import struct
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buf = sys.stdin.readlines()
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json = json.loads(" ".join(buf))
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histogram = base64.b64decode(json["histogram"])
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bucket_shift = json["bucket_shift"]
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tsc_rate = json["tsc_rate"]
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print("Latency histogram")
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print("==============================================================================")
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print(" Range in us Cumulative IO count")
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so_far = 0
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bucket = 0
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total = 1
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for i in range(0, 64 - bucket_shift):
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for j in range(0, (1 << bucket_shift)):
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index = (((i << bucket_shift) + j) * 8)
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total += int.from_bytes(histogram[index:index + 8], 'little')
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for i in range(0, 64 - bucket_shift):
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for j in range(0, (1 << bucket_shift)):
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index = (((i << bucket_shift) + j)*8)
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count = int.from_bytes(histogram[index:index + 8], 'little')
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so_far += count
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last_bucket = bucket
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if i > 0:
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bucket = (1 << (i + bucket_shift - 1))
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bucket += ((j+1) << (i - 1))
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else:
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bucket = j+1
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start = last_bucket * 1000 * 1000 / tsc_rate
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end = bucket * 1000 * 1000 / tsc_rate
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so_far_pct = so_far * 100.0 / total
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if count > 0:
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print("%9.3f - %9.3f: %9.4f%% (%9u)" % (start, end, so_far_pct, count))
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