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JMT - Java Modelling Tools Changelog

What's new in JMT - Java Modelling Tools 0.8.0

Apr 24, 2013
  • Major features:
  • JSIM: Processor sharing queues
  • JWAT: Fitting for automatic detection of workload parameters
  • JSIM/JMVA: New performance indices like system power, response time and throughput per sink in open systems
  • JMCH: New stations analyzed with Markov Chain technique
  • General: new documentation (a complete user manual of 167 pages, a collection of projects solved with JMT, papers, etc.)
  • General: A new free e-library for upload/download documents, projects, exercises, teaching material concerning performance topics is on-line now! ( http://perflib.net ).
  • General: Installation is now fully compatible with Windows VISTA and Windows 7.
  • General: Updated code to Java 1.5 to support newer language features
  • JSIM/JMVA: Added command line solvers so that the execution engine may be called from an external script in batch
  • Minor features:
  • JSIM: Round robin burst distribution
  • JSIM: Consider priority on waiting queues outside a Finite Capacity Region
  • JSIM: Improvement to the logger component, now supports internationalization settings in CSV files
  • JSIM: Minimum number of samples to 50.000 before a measure is accepted by spectral analysis method. This will give more correct measure estimates.
  • BugFixes:
  • JSIM: Fixed the wrong estimation of response times in finite capacity regions
  • JSIM: Jobs with zero service time are now queued before being routed to the next station
  • JSIM: Fixed a problem that could cause some jobs to be lost if a fork was placed just before a finite capacity region
  • JSIM: Fixed a bug where some logging lines at the beginning of a CSV files could be lost.

New in JMT - Java Modelling Tools 0.7.4 (Jul 3, 2009)

  • Major features
  • ==============
  • JSIM: Added General and MMPP(2) (Modulated Markov Poisson Process) to simulate bursty sources and service times. Please refer to the users manual for more details.
  • JSIM: Added Logger station. This allows to log the time of passage of each job that flows through it into a CSV file. There may be some minor problems with the interface, that will be fixed in the next release, but basically the new component is working.
  • DOCUMENTATION: New help and user manual. The user manual is now completed (155 pp) for all the packages (except for the JMCH). Exercises and new example files are deliverd. A collection of 18 case studies performed using JMT is available for fre download (see "Minor features" for details).
  • Minor features
  • ==============
  • General: manuals and documentation are now provided on-line as a separate download from the project web page. See page http://jmt.sourceforge.net/Documentation.html.
  • General: New example files are distributed in the folder "Java Modelling Tools/examples"
  • JSIM: removed output files from temporary directory
  • JSIMgraph: Show open model name on the title bar
  • JSIM: Renamed "Shortest Queue Length" to "Join the Shortest Queue", and "Server" to "Queueing Station" to be compliant with definitions used in literature
  • JSIM: Renamed "Customer Number" measure to "Number of Customers"
  • JSIM: Changed the definition of utilization measure for multiserver stations: now the average utilization of all servers is computed (instead of using the sum of the utilizations of the servers). This is to be compliant with the definitions mostly used in literature. Now utilization for a multiserver queueing station is always between 0 and 1 (utilization for delays can be greater than one).
  • BugFixes
  • ========
  • JSIM: Fix an issue that could cause wrong results when using multiclass stations, under high load conditions
  • JMVA: Wrong saturation checks during what-if analyses on service demands.
  • JMVA: Fix a crash when OutOfMemory occurred due to a network too complex to be solved with exact MVA.
  • JMVA: Fix a bug when the closed class population was not incremented in what-if analysis in certain models.
  • JABA: Fix inverted labels for X and Y axis on 2D graphical result
  • JABA: Fix a graphical problem and overflow with service demands bigger than 500
  • JWAT: Fix problems with the save of previous work sessions