parsetrace/ipt.py

   1 #!/usr/bin/python
   2 #
   3 # Analyze the inter-packet times of requests to/from cloud storage providers.
   4
   5 import json, sys
   6
   7 RTT_EST = 0.03
   8
   9 def analyze_transfer(timings):
  10     for (delay, bytes) in timings:
  11         gap = False
  12         if delay > 2 * RTT_EST:
  13             gap = True
  14             print "Long gap of", delay
  15         elif delay > RTT_EST / 2:
  16             gap = True
  17             print "Short gap of", delay
  18         if gap:
  19             print "    [occurred after", bytes, "bytes]"
  20
  21 for f in sys.argv[1:]:
  22     stats = json.load(open(f))
  23     for s in stats:
  24         if 'interpacket_times' in s:
  25             analyze_transfer(s['interpacket_times'])