Package SimPy :: Module SimulationRT

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# Module SimulationRT

source code

    SimulationRT 2.0 Provides synchronization of real time and SimPy simulation time.
    Implements SimPy Processes, resources, and the backbone simulation scheduling
    by coroutine calls.
    Based on generators (Python 2.3 and later; not 3.0)

    LICENSE:
    Copyright (C) 2002, 2005, 2006, 2007, 2008  Klaus G. Muller, Tony Vignaux
    mailto: kgmuller@xs4all.nl and Tony.Vignaux@vuw.ac.nz

        This library is free software; you can redistribute it and / or
        modify it under the terms of the GNU Lesser General Public
        License as published by the Free Software Foundation; either
        version 2.1 of the License, or (at your option) any later version.

        This library 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
        Lesser General Public License for more details.

        You should have received a copy of the GNU Lesser General Public
        License along with this library; if not, write to the Free Software
        Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111 - 1307  USA
    END OF LICENSE

    **Change history:**
        4 / 8/2003: - Experimental introduction of synchronization of simulation
                    time and real time (idea of Geoff Jarrad of CSIRO -- thanks,
                    Geoff!).
                    * Changes made to class EvlistRT, _nextev(), simulate()

        Dec 11, 2003:
                - Updated to Simulation 1.4alpha API

        13 Dec 2003: Merged in Monitor and Histogram

        27 Feb 2004: Repaired bug in activeQ monitor of class Resource. Now actMon
                     correctly records departures from activeQ.

        19 May 2004: Added erroneously omitted Histogram class.

        5 Sep 2004: Added SimEvents synchronization constructs

        17 Sep 2004: Added waituntil synchronization construct

        28 Sep 2004: Changed handling of real time -- now uses time.clock for Win32, and
                     time.time for all other OS (works better on Linux, Unix).

        01 Dec 2004: SimPy version 1.5
                     Changes in this module: Repaired SimEvents bug re proc.eventsFired

        12 Jan 2005: SimPy version 1.5.1
                     Changes in this module: Monitor objects now have a default name
                                             'a_Monitor'

        29 Mar 2005: Start SimPy 1.6: compound 'yield request' statements

        05 Jun 2005: Fixed bug in _request method -- waitMon did not work properly in
                     preemption case

        09 Jun 2005: Added test in 'activate' to see whether 'initialize()' was called first.

        23 Aug 2005: - Added Tally data collection class
                     - Adjusted Resource to work with Tally
                     - Redid function allEventNotices() (returns prettyprinted string with event
                       times and names of process instances
                     - Added function allEventTimes (returns event times of all scheduled events)

        16 Mar 2006: - Added Store and Level classes
                     - Added 'yield get' and 'yield put'

        10 May 2006: - Repaired bug in Store._get method
                     - Repaired Level to allow initialBuffered have float value
                     - Added type test for Level get parameter 'nrToGet'

        06 Jun 2006: - To improve pretty - printed output of 'Level' objects, changed attribute
                       _nrBuffered to nrBuffered (synonym for amount property)
                     - To improve pretty - printed output of 'Store' objects, added attribute
                       buffered (which refers to _theBuffer)

        25 Aug 2006: - Start of version 1.8
                     - made 'version' public
                     - corrected condQ initialization bug

        30 Sep 2006: - Introduced checks to ensure capacity of a Buffer > 0
                     - Removed from __future__ import (so Python 2.3 or later needed)

        15 Oct 2006: - Added code to register all Monitors and all Tallies in variables
                       'allMonitors' and 'allTallies'
                     - Added function 'startCollection' to activate Monitors and Tallies at a
                       specified time (e.g. after warmup period)
                     - Moved all test / demo programs to after 'if __name__ == '__main__':'.

        17 Oct 2006: - Added compound 'put' and 'get' statements for Level and Store.

        18 Oct 2006: - Repaired bug: self.eventsFired now gets set after an event fires
                       in a compound yield get / put with a waitevent clause (reneging case).

        21 Oct 2006: - Introduced Store 'yield get' with a filter function.

        22 Oct 2006: - Repaired bug in prettyprinting of Store objects (the buffer
                       content==._theBuffer was not shown) by changing ._theBuffer
                       to .theBuffer.

        04 Dec 2006: - Added printHistogram method to Tally and Monitor (generates
                       table - form histogram)

        07 Dec 2006: - Changed the __str__ method of Histogram to print a table
                       (like printHistogram).

        18 Dec 2006: - Added trace printing of Buffers' 'unitName' for yield get and put.

        09 Jun 2007: - Cleaned out all uses of 'object' to prevent name clash.

        18 Nov 2007: - Start of 1.9 development
                     - Added 'start' method (alternative to activate) to Process

        22 Nov 2007: - Major change to event list handling to speed up larger models:
                        * Drop dictionary
                        * Replace bisect by heapq
                        * Mark cancelled event notices in unpost and skip them in
                          nextev (great idea of Tony Vignaux))

        4 Dec 2007: - Added twVariance calculation for both Monitor and Tally (gav)

        5 Dec 2007: - Changed name back to timeVariance (gav)

        1 Mar 2008: - Start of 1.9.1 bugfix release
                    - Delete circular reference in Process instances when event
                      notice has been processed (caused much circular garbage)

        2 Apr 2008: - Repair of wallclock synchronisation algorithm

        10 Aug 2008: - Renamed __Evlist to EvlistRT and let it inherit from
                       Evlist (from Simulation.py) (Stefan Scherfke)
                     - New class SimulationRT contains the old method simulate
                     - Removed everything else and imported it from Simulation.py

        19 Mar 2009: - Repair of wallclock synchronisation algorithm (again)

Version: 2.0 $Revision: 271 $ $Date: 2009-03-25 13:27:06 +0100 (Mi, 25 Mrz 2009) $

Classes | [hide private]

| EvlistRT Defines event list and operations on it
| SimulationRT

Functions | [hide private]

rtnow() | source code

rtset(rel_speed=1) resets the the ratio simulation time over clock time(seconds). | source code

simulate(until=0, real_time=False, rel_speed=1) | source code

Variables | [hide private]

| __TESTING = `False`
| version = ``'``2.0 $Revision: 271 $ $Date: 2009-03-25 13:27:06 +01``...``
| __package__ = ``'``SimPy``'``

Variables Details | [hide private]

### version

Value:

      '2.0 $Revision: 271 $ $Date: 2009-03-25 13:27:06 +0100 (Mi, 25 Mrz 200
      9) $'