[nimh-dev] more format profiling

[Joel Uckelman <uckelman@xxxxxxxxx>]

Here's what the profiler tells me when I run my present version of scan.py:

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.010    0.010    0.743    0.743 nscan.py:5(?)
        1   -0.000   -0.000    0.743    0.743 profile:0(<code object ? at 0xf6d0c420, file "nscan.py", line 5>)
        1    0.017    0.017    0.638    0.638 test:1(?)
        1   -0.000   -0.000    0.638    0.638 Format.py:23(inst_loop)
      154    0.017    0.000    0.564    0.004 Folder.py:19(openmessage)
      154    0.016    0.000    0.547    0.004 Message.py:4(message_from_file)
      154    0.006    0.000    0.470    0.003 __init__.py:54(message_from_file)
  177/154   -0.006   -0.000    0.457    0.003 Parser.py:53(parse)
  177/154    0.167    0.001    0.356    0.002 Parser.py:143(_parsebody)
       44    0.008    0.000    0.160    0.004 sre_compile.py:461(compile)

These are the top 10 functions by cumulative time. Of the 0.743s that
nscan.py takes, most of that is spent in test, which is the format code.
Unfortunately, 5/6 of the time used by test is for Folder.openmessage(),
so my format code is within 0.074s of optimality. Folder.openmessage() wraps
Message.message_from_file(), and from there execution goes off into the
email module. So it looks like reducing execution time significantly would
involve implementing some of the email module ourselves. Ick.
 
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