ANN: Release of simulation package SimPy 1.6.1

Klaus Muller kgmuller at
Mon Nov 21 16:27:40 CET 2005

It is our pleasure to announce the release of version 1.6.1 of the SimPy
discrete event simulation package. Download from .

What is SimPy?
SimPy (= Simulation in Python) is an object-oriented, process-based
discrete-event simulation language based on standard Python. It is released
under the GNU Lesser GPL (LGPL). SimPy provides the modeler with components
of a simulation model including processes, for active components like
customers, messages, and vehicles, and resources, for passive components
that form limited capacity congestion points like servers, checkout
counters, and tunnels. It also provides monitor variables to aid in
gathering statistics. Random variates are provided by the standard Python
random module.

SimPy is in use at many universities, research institutes and in industry.

What is new?
- Addition of Tally data collection class as an alternative
  to Monitor. It is intended for collecting very large data sets (50000
observations or more)
  more efficiently in storage space and time than Monitor.
- Addition of function setHistogram to class Monitor for initializing
- Addition of function allEventTimes (returns event times of all scheduled 

- Change of Resource to work with Tally (new Resource 
  API is backwards-compatible with 1.6).

- Revised function allEventNotices() for debugging/teaching purposes. It
  a pretty-printed string with event times and names of process instances.

Nature/purpose of this release?
SimPy 1.6.1 is a minor sub-release of version 1.6. It does not add any new
simulation constructs,
but just provides support to efficient simulation data collection of large
numbers of observations.

Enjoy, and don't forget to give us you feedback!

Klaus Müller
Tony Vignaux

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