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272 lines
11 KiB
272 lines
11 KiB
This file contains details of the changes in each new version of PRISM,
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including development and beta versions. For a less detailed overview
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of the main changes in each public release, see the file VERSIONS.txt.
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-----------------------------------------------------------------------------
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Version 2.1.dev11.sim8 (3/3/06)
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-----------------------------------------------------------------------------
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* Bug fix: computation of powers in simulator
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* Bug fix: calculation of transition rewards from multiple actions
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* Bug fixes: loop detection and deadlocks in simulator
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-----------------------------------------------------------------------------
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Version 2.1.dev11.sim7 (5/1/06)
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-----------------------------------------------------------------------------
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* Bug fixes, tidying
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-----------------------------------------------------------------------------
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Version 2.1.dev11.sim6 (16/12/05)
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-----------------------------------------------------------------------------
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* Merged with simulator branch
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* Improved options management including saving of user settings
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-----------------------------------------------------------------------------
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Version 2.1.dev11 (5/12/05)
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-----------------------------------------------------------------------------
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Changes:
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* Bugfixes in GUI syntax highlighting, esp. for large model files
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* Bugfix: out-of-range initial values banned
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-----------------------------------------------------------------------------
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Version 2.1.dev10 (21/10/05)
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-----------------------------------------------------------------------------
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Changes:
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* GUI syntax highlighting restructure and efficiency improvement
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* Bugfix/tidy in GUI experiments, esp. with Booleans
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* Bugfix/improvements in modulo operations
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* Improvements to checks of probabilities/rates, e.g. for NaN
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* Ability to disable checks of probabilities/rates
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-----------------------------------------------------------------------------
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Version 2.1.dev9 (27/05/05)
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-----------------------------------------------------------------------------
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Changes:
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* Tidied up simulator code/stubs
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* Graphical model editor disabled
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-----------------------------------------------------------------------------
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Version 2.1.dev8 (11/05/2005)
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-----------------------------------------------------------------------------
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Changes:
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* Can now be built on OS X
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* Makefile improvements including better OS detection
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* Bug fix improving efficiency of BSCC computation
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* Improved reporting of multiple missing constants
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-----------------------------------------------------------------------------
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Version 2.1.dev7 (22/2/2005)
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-----------------------------------------------------------------------------
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Changes:
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* Graphical model editor (temporarily?) enabled
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* Addition of simulator code and stubs
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* Tweaked main Makefile: stops after first error
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-----------------------------------------------------------------------------
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Version 2.1.dev6 (18/2/2005)
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-----------------------------------------------------------------------------
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Changes:
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* Bug fix - alphabet for default synchronisation is now derived syntactically
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* Updates to some APMC code
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-----------------------------------------------------------------------------
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Version 2.1.dev5 (11/2/2005)
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-----------------------------------------------------------------------------
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Partially completed changes:
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* PRISM Preprocessor
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* Improved hybrid GS
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* Improved syntax highlighting
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Changes:
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* Max memory for Java VM modifiable via PRISM_JAVAMAXMEM environment variable
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* Reorganisation of Linux/Solaris launch scripts
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* New notation for functions in PRISM language: func(f,x,y)
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* New built-in functions in PRISM language (new notation only) - power(pow), modulo(mod)
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* Upgrade to newest version of CUDD (2.4.0)
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* GUI supports multi-line comments for properties
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* Command-line override of model type allowed (-dtmc,-ctmc,-mdp switches)
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* Tidy up of output generated by filters in P/S operators
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* Added built-in label "deadlock", true in states where deadlocks fixed by PRISM
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* Conditional evaluation operator now allows bracketless nesting, e.g. a?b:c?d:e
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* Bug fixes
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-----------------------------------------------------------------------------
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Version 2.1.dev4 (21/1/2005)
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-----------------------------------------------------------------------------
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Changes:
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* New syntax for transition rewards (within rewards construct)
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* Bugfix in Prob1A precomputation algorithm
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* Bugfix: disappearing "{min}"/"{max}" from P/R operators
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* Numerous improvements to graph plotting tool
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- Export of graphs to Matlab
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- Import/export of graphs from/to XML
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- Enhanced scale behaviour/options
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- Improved editing of series properties/data
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- Various bug fixes
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* More thorough checks of commands during model construction
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- each command must define transitions for all states satisfying guard
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-----------------------------------------------------------------------------
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Version 2.1.dev3 (17/11/2004)
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-----------------------------------------------------------------------------
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Partially completed changes:
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* Graphical model editor significantly improved (but disabled for now)
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Changes:
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* Support for import of (explicit) transition matrix and state space
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(command-line only, via -importtrans/-importstates switches (and -dtmc,-ctmc,-mdp))
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* Improvements to graph plotting functionality
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* Log in GUI now operates with a limited size buffer to avoid out-of-memory problems
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-----------------------------------------------------------------------------
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Version 2.1.dev2 (20/10/2004)
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-----------------------------------------------------------------------------
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Partially completed changes:
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* Support for costs/rewards
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- DTMC: R[F] H/S/M
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- MDP: R[F] M ok, H partial
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- CTMC: R[F] H/S/M, R[I=t] H/S/M, R[S] H/S/M, C[<=t] H/S/M
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Changes:
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* Added facility to compute transient probabilities
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-----------------------------------------------------------------------------
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Version 2.1.dev1 (7/10/2004)
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-----------------------------------------------------------------------------
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Partially completed changes:
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* Support for costs/rewards
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* Checks during model construction that rates are non-negative and probabilities sum to one
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Changes:
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* Multiple initial states init...endinit
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* Support for displaying min/max of a range of probabilities using {} notation
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* New "compact" storage schemes (distinct values only) added to sparse/hybrid engines
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* Sparse storage schemes now use (more compact) counts instead of start indices for rows/cols
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* True Gauss-Seidel algorithm for hybrid engine
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* New switches (-pgs, -psor, -bpgs, -bpsor) to access hybrid "psuedo" methods
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* Language modification: updates can be "true", i.e. no variables change
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* Added conditional evaluation operator (cond ? then : else) to PRISM language
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-----------------------------------------------------------------------------
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Version 2.1 (released 8/9/2004)
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-----------------------------------------------------------------------------
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Changes:
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* Now possible to build/run PRISM on Windows
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* Compilation/installation procedures slightly simplified
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* Splash screen on load
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-----------------------------------------------------------------------------
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Version 2.0 (released 17/3/2004)
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-----------------------------------------------------------------------------
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Changes:
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* Completely new graphical user interface, including:
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- Text editor for PRISM language
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- Automated results collection/graph plotting
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* Enhancements to PRISM language:
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- Types (ints, doubles and booleans) and type checking added
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- Probabilities/rates can now be expressions
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- Variable ranges/initial values can now be expressions
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- Constant/formula definitions can be expressions (including in terms of each other)
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- Process algebra style definitions allowed for MDPs too (via "system" construct)
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* Enhancements to property specifications:
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- Probability/time bounds in PCTL/CSL properties can now be expressions
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- Use of constants now permitted: both those from the model and newly declared ones
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- Added "init" keyword to PCTL/CSL (atomic proposition true only in initial state)
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- Can define and reuse "labels" (atomic propositions) (like formulas in model files)
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- Can write properties of the form "P=?[...]" which return the actual probability
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* Additional features:
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- Automatic handling of multiple model checking computations,
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e.g. check "P~p[true U<=k error]" for k=1..100
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- Added -exportstates switch, exports reachable states to text file
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- Added -nobscc switch for optional bypass of BSCC computation
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- Added explicit versions of export options (including first export option for MDPs)
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- Export options can now be used in conjunction with each other and with model checking
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- Added -version switch to display version
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* Efficiency improvements
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- Improved heuristics for hybrid engine (sb/sbmax/gsl switches -> sbmax/sbl/gsmax/gsl)
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- More efficient construction process for unstructured models
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- General restructuring/improvements to model construction process implementation
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* Miscellaneous
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- Various bug fixes
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- Fairness (for MDP model checking) now OFF by default (used to be ON)
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-----------------------------------------------------------------------------
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Version 1.3.1 (released 20/2/2003)
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-----------------------------------------------------------------------------
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Changes:
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* Bug fixes in model construction code
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-----------------------------------------------------------------------------
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Version 1.3 (released 10/2/2003)
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-----------------------------------------------------------------------------
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Changes:
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* Steady-state probability computation improved to include strongly connected component (SCC) computation
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* Extended support for CSL time-bounded until operator to include arbitrary intervals
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* More flexible parallel composition options in the PRISM language (for DTMCs and CTMCs)
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* Added option to import PEPA process algebra descriptions as models
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* Improved range of numerical methods: (Backwards) Gauss-Seidel and (Backwards) SOR (plus variants for hybrid engine)
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* Added -pctl/-csl switches to allow command line specification of properties
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* Improved handling of deadlock states: can add self-loops to these states automatically (e.g. -fixdl switch)
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* Steady-state probabilities are no longer automatically computed for CTMCs: use the -ss switch
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* Addition of {} operator to PCTL/CSL formulas to support printing of probabilities
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* Resolved problem with PRISM language syntax: updates must now be parenthesised
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* Default value for maximum number of iterations reduced from 500,000 to (more sensible) 10,000
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* Added switches to control CUDD behaviour (-cuddmaxmem, -cuddepsilon)
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* Additional example files
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* Numerous bug fixes
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* Now released under the GPL license
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-----------------------------------------------------------------------------
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Version 1.2 (released 17/9/2001)
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-----------------------------------------------------------------------------
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First public release
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