benchmark/proto/compare_sizes.py

   1 #!/usr/bin/env python
   2
   3 from __future__ import division
   4 import sys
   5 import numbers
   6
   7 import openxc_pb2
   8 import json
   9
  10 def sizeof_fmt(num):
  11     for unit in ['bytes', 'KB', 'MB', 'GB', 'TB']:
  12         if num < 1024.0:
  13             return "%3.1f%s" % (num, unit)
  14         num /= 1024.0
  15
  16 total_raw_can_size = 0
  17 total_raw_json_size = 0
  18 total_raw_binary_size = 0
  19 total_translated_json_size = 0
  20 total_translated_binary_size = 0
  21
  22 for trace_file in sys.argv[1:]:
  23     for line in open(trace_file):
  24         try:
  25             json_message = json.loads(line)
  26         except ValueError:
  27             continue
  28
  29         if 'id' and 'data' in json_message:
  30             # rough approx. that CAN messages are 10 bytes - they could be less
  31             # but most of ours are full 64+11 bits
  32             total_raw_can_size += 10
  33             total_raw_json_size += len(line)
  34             binary_message = openxc_pb2.RawMessage()
  35             binary_message.message_id = json_message['id']
  36             binary_message.data = int(json_message['data'], 0)
  37             total_raw_binary_size += len(binary_message.SerializeToString())
  38         else:
  39             if isinstance(json_message['value'], bool):
  40                 binary_message = openxc_pb2.TranslatedBooleanMessage()
  41             elif isinstance(json_message['value'], numbers.Number):
  42                 binary_message = openxc_pb2.TranslatedNumericMessage()
  43             else:
  44                 binary_message = openxc_pb2.TranslatedStringMessage()
  45             binary_message.name = json_message['name']
  46             binary_message.value = json_message['value']
  47             total_translated_json_size += len(line)
  48             total_translated_binary_size += len(binary_message.SerializeToString())
  49
  50
  51 print("For the %d trace files given..." % len(sys.argv[1:]))
  52 print("Total transferred raw CAN size is %s" % sizeof_fmt(total_raw_can_size))
  53 print("Total transferred raw JSON size is %s" % sizeof_fmt(total_raw_json_size))
  54 print("Total transferred raw binary size is %s" % sizeof_fmt(total_raw_binary_size))
  55 print("Total transferred translated JSON size is %s" %
  56         sizeof_fmt(total_translated_json_size))
  57 print("Total transferred translated binary size is %s" %
  58         sizeof_fmt(total_translated_binary_size))
  59
  60 total_json_size = total_raw_json_size + total_translated_json_size
  61 print("Total transferred JSON size is %s" % sizeof_fmt(total_json_size))
  62 total_binary_size = total_raw_binary_size + total_translated_binary_size
  63 print("Total transferred binary size is %s" % sizeof_fmt(total_binary_size))
  64
  65 if total_raw_can_size > 0:
  66     print("Binary encoding adds %f%% overhead to raw CAN messages" % (
  67             total_raw_binary_size / total_raw_can_size * 100 - 100))
  68     print("JSON encoding adds %f%% overhead to raw CAN messages" % (
  69             total_raw_json_size / total_raw_can_size * 100 - 100))
  70 if total_raw_json_size > 0:
  71     print("Binary encoding is %f%% smaller than JSON for raw messages" % (
  72             100 - (total_raw_binary_size / total_raw_json_size * 100)))
  73 if total_translated_json_size > 0:
  74     print("Binary encoding is %f%% smaller than JSON for translated messages" % (
  75             100 - (total_translated_binary_size / total_translated_json_size * 100)))
  76 print("Binary encoding is %f%% smaller than JSON overall" % (
  77         100 - (total_binary_size / total_json_size * 100)))