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         del json_message['timestamp']
  30
  31         message = openxc_pb2.VehicleMessage()
  32
  33         if 'id' and 'data' in json_message:
  34             # rough approx. that CAN messages are 10 bytes - they could be less
  35             # but most of ours are full 64+11 bits
  36             total_raw_can_size += 10
  37             total_raw_json_size += len(json.dumps(json_message))
  38             binary_message = openxc_pb2.RawMessage()
  39             binary_message.message_id = json_message['id']
  40             binary_message.data = int(json_message['data'], 0)
  41             message.type = openxc_pb2.VehicleMessage.RAW
  42             message.raw_message = binary_message
  43             total_raw_binary_size += len(message.SerializeToString())
  44         else:
  45             message.type = openxc_pb2.VehicleMessage.TRANSLATED
  46             message.translated_message.name = json_message['name']
  47             if isinstance(json_message['value'], bool):
  48                 message.translated_message.boolean_value = json_message['value']
  49             elif isinstance(json_message['value'], numbers.Number):
  50                 message.translated_message.numerical_value = json_message['value']
  51             else:
  52                 message.translated_message.string_value = json_message['value']
  53             total_translated_json_size += len(json.dumps(json_message))
  54             total_translated_binary_size += len(message.SerializeToString())
  55
  56
  57 print("For the %d trace files given..." % len(sys.argv[1:]))
  58 print("Total transferred raw CAN size is %s" % sizeof_fmt(total_raw_can_size))
  59 print("Total transferred raw JSON size is %s" % sizeof_fmt(total_raw_json_size))
  60 print("Total transferred raw binary size is %s" % sizeof_fmt(total_raw_binary_size))
  61 print("Total transferred translated JSON size is %s" %
  62         sizeof_fmt(total_translated_json_size))
  63 print("Total transferred translated binary size is %s" %
  64         sizeof_fmt(total_translated_binary_size))
  65
  66 total_json_size = total_raw_json_size + total_translated_json_size
  67 print("Total transferred JSON size is %s" % sizeof_fmt(total_json_size))
  68 total_binary_size = total_raw_binary_size + total_translated_binary_size
  69 print("Total transferred binary size is %s" % sizeof_fmt(total_binary_size))
  70
  71 if total_raw_can_size > 0:
  72     print("Binary encoding adds %f%% overhead to raw CAN messages" % (
  73             total_raw_binary_size / total_raw_can_size * 100 - 100))
  74     print("JSON encoding adds %f%% overhead to raw CAN messages" % (
  75             total_raw_json_size / total_raw_can_size * 100 - 100))
  76 if total_raw_json_size > 0:
  77     print("Binary encoding is %f%% smaller than JSON for raw messages" % (
  78             100 - (total_raw_binary_size / total_raw_json_size * 100)))
  79 if total_translated_json_size > 0:
  80     print("Binary encoding is %f%% smaller than JSON for translated messages" % (
  81             100 - (total_translated_binary_size / total_translated_json_size * 100)))
  82 print("Binary encoding is %f%% smaller than JSON overall" % (
  83         100 - (total_binary_size / total_json_size * 100)))