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#!/usr/bin/python
#-------------------------------------------------------------------------------
#               ______                _     ____          __  __
#              |  ____|             _| |_  / __ \   /\   |  \/  |
#              | |__ _ __ ___  ___ /     \| |  | | /  \  | \  / |
#              |  __| '__/ _ \/ _ ( (| |) ) |  | |/ /\ \ | |\/| |
#              | |  | | |  __/  __/\_   _/| |__| / ____ \| |  | |
#              |_|  |_|  \___|\___|  |_|   \____/_/    \_\_|  |_|
#
#                   FreeFOAM: The Cross-Platform CFD Toolkit
#
# Copyright (C) 2008-2012 Michael Wild <themiwi@users.sf.net>
#                         Gerber van der Graaf <gerber_graaf@users.sf.net>
#-------------------------------------------------------------------------------
# License
#   This file is part of FreeFOAM.
#
#   FreeFOAM is free software: you can redistribute it and/or modify it
#   under the terms of the GNU General Public License as published by the
#   Free Software Foundation, either version 3 of the License, or (at your
#   option) any later version.
#
#   FreeFOAM is distributed in the hope that it will be useful, but WITHOUT
#   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
#   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
#   for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with FreeFOAM.  If not, see <http://www.gnu.org/licenses/>.
#
# Script
#     freefoam-graphExecTime
#
# Description
#     This utility computes the time used per iteration in seconds and writes
#     it to the file 'executionTime.dat' in TecPlot format.
#------------------------------------------------------------------------------

"""Usage: freefoam graphExecTime [-h, -help] <logFile>

This utility computes the time used per iteration in seconds and writes it to
the file 'executionTime.dat' in TecPlot format.

Options
-------
<logFile> The log file from which to extract the data.
-h, -help Display this help message.

"""

import sys
import os.path
import re
# want to be future proof
sys.path.insert(0, '/usr/lib/python2.7/site-packages')
from FreeFOAM.compat import *

if len(sys.argv[1:]) != 1:
   sys.stderr.write('Error: Require a log file as argument\n')
   sys.stderr.write(__doc__+'\n')
   sys.exit(1)

if sys.argv[1] == '-h' or sys.argv[1] == '-help':
   print(__doc__)
   sys.exit(0)

logFile = sys.argv[1]
if not os.path.isfile(logFile):
   sys.stderr.write('Error: no such file')
   sys.exit(1)

# parse the execution times from the log file and compute differences
regex = re.compile(r'ExecutionTime\s+=\s+(?P<time>\S+)')
tprev = 0
dt = []
for l in open(logFile, 'rt'):
   m = regex.match(l)
   if m:
      t = float(m.group('time'))
      dt.append(t-tprev)
      tprev = t

# write file header
outFile = open('ExecutionTime.dat', 'wt')
outFile.write("""Solver Performance
iterations
time/iteration
0 0
0 0
1
""")

# write data
if len(dt) > 0:
   outFile.write("""time
0
%d
"""%len(dt))

   for i, v in enumerate(dt):
      outFile.write('%d  %g\n'%(i+1, v))

outFile.close()

# ------------------- vim: set sw=3 sts=3 ft=python et: ------------ end-of-file