./imitator simop.imi -mode PDFC -output-states -output-trace-set -output-cart -output-result -time-limit 300
    ************************************************************
    *  IMITATOR 2.8-alpha "Butter Ham"                         *
    *                                                          *
    *                     Etienne Andre, Ulrich Kuehne et al.  *
    *                                             2009 - 2016  *
    *                       LSV, ENS de Cachan & CNRS, France  *
    *  LIPN, Universite Paris 13, Sorbonne Paris Cite, France  *
    *                                         www.imitator.fr  *
    *                                                          *
    *                   Build: 1981 (2016-05-11 07:25:18 UTC)  *
    *                                          master/ab08ea8  *
    ************************************************************
    Analysis time: Wed May 11, 2016 13:09:56
    
    Model: simop.imi
    Mode: Parametric deadlock-checking.
    The cartography will be drawn.
    The result will be written to a file.
    The trace set(s) will be generated in a graphical mode.
    Description of states will be output.
 *** Warning: IMITATOR will try to stop after 300 seconds.
    
    Abstract model built after 0.015 second.
    Memory for abstract model: 858.035 KiB (i.e., 219657 words)
    
    Starting running algorithm Parametric deadlock-freeness checking...
    
    Computing post^1 from 1 state.
    Computing post^2 from 1 state.
    Computing post^3 from 2 states.
    Computing post^4 from 4 states.
    Computing post^5 from 7 states.
    Computing post^6 from 11 states.
    Computing post^7 from 15 states.
    Computing post^8 from 21 states.
    Computing post^9 from 26 states.
    Computing post^10 from 34 states.
    Computing post^11 from 43 states.
    Computing post^12 from 65 states.
    Computing post^13 from 101 states.
    Computing post^14 from 164 states.
    Computing post^15 from 282 states.
    Computing post^16 from 485 states.
    Computing post^17 from 800 states.
    Computing post^18 from 1247 states.
    Computing post^19 from 1826 states.
    Computing post^20 from 2594 states.
    Computing post^21 from 3597 states.
    Computing post^22 from 4924 states.
 *** Warning: The time limit has been reached. The exploration now stops, although there were still 6644 states to explore at this iteration.
    
    State space exploration stopped at a depth of 23: 22894 states with 31043 transitions explored.
    
      [Parametric deadlock-freeness checking] Algorithm completed after 328.872 seconds.
    
      [Parametric deadlock-freeness checking] Starting backward under-approximation...
      [Parametric deadlock-freeness checking] Backward under-approximation completed after 450.801 seconds.
    
    Final possibly under-approximated constraint such that the system is deadlock-free:
    False
    
    Final possibly over-approximated constraint such that the system is deadlock-free:
     SIGmrt > 0
    & COMct >= 115
    & COMct + SIGmrt >= 2465
    OR
      COMct + SIGmrt >= 1865
    & COMct > SIGmrt
    & SIGmrt > 70
    & 2465 > COMct + SIGmrt
    OR
      COMct >= 115
    & 2465 > COMct + SIGmrt
    & COMct + SIGmrt >= 565
    & SIGmrt >= COMct
    OR
      COMct + SIGmrt >= 1265
    & SIGmrt >= 80
    & COMct > SIGmrt
    & 1865 > COMct + SIGmrt
    OR
      COMct + SIGmrt >= 1165
    & COMct > SIGmrt
    & SIGmrt + 35 >= COMct
    & 1265 > COMct + SIGmrt
    OR
      COMct > SIGmrt
    & COMct + SIGmrt >= 665
    & SIGmrt + 10 >= COMct
    & 1165 > COMct + SIGmrt
    OR
      COMct >= 115
    & SIGmrt > 70 + COMct
    & 565 > COMct + SIGmrt
    This constraint is both a possibly under-approximation and a possibly over-approximation (or the actual result itself)

    Estimated memory used: 5.648 GiB (i.e., 758124220 words of size 8)
    
    Result written to file 'simop.res'.
    
    --------------------
    Statistics on state space
    --------------------
    Number of states              : 22894
    Number of transitions         : 31043
    Number of computed states     : 31044
    Computation time              : 450.784 seconds
    States/second in state space  : 50.7 (22894/450.784 seconds)
    Computed states/second        : 68.8 (31044/450.784 seconds)
    
    Generating graphical output to 'simop-statespace.jpg'...
dot: graph is too large for cairo-renderer bitmaps. Scaling by 0.0644532 to fit
    Writing the states description to file 'simop-statespace.states'...
 *** ERROR: Fatal internal error: not implemented
 Please (politely) insult the developers.
 *** ERROR: IMITATOR aborted (after 4995.593 seconds)