This file contains details of the changes in each new version of PRISM, including development and beta versions. For a less detailed overview of the main changes in each public release, see the file VERSIONS.txt. ----------------------------------------------------------------------------- Ongoing changes: * LTL model checking for MDPs * CTL model checking Latest changes (reverse chronological): [correct wrt svn rev 901] * Improvements to memory handling, especially in sparse/hybrid engines * Updated JFreeChart library * Multiple -const switches allowed at command-line * Efficiency improvements to precomputation algorithms * Added symmetry reduction functionality * New -exportbsccs option * Initial state info for explicit import is now via -importlabels * Added prism2html/prism2latex tools (in etc/scripts) * Transient probabilities computation for DTMCs * Sparse/hybrid versions of instantaneous reward properties (R=?[I=k]) for DTMCs * Easier viewing of model checking results in GUI * Steady-state properties/operators for DTMCs * New language parser: - improved efficiency, especially on large/complex models - more accurate error reporting * GUI model editor improvements: - error highlighting - line numbers - undo/redo feature * Modelling language changes: - cleaner notation for functions, e.g. mod(i,n), not func(mod,i,n) - function names can be renamed in module renaming - language strictness: updates (x'=...) must be parenthesised - ranges (x=1..3,5) no longer supported - added conversion tool for old models (etc/scripts/prism3to4) * Expanded property specification language - arbitrary expressions allowed, e.g. 1-P=?[...] - support got weak until (W) and release (R) added - optional semicolons to terminate properties in properties files - steady-state operators (S=?[...], R=?[S]) allowed for DTMCs * Other minor technical changes to language: - implication allowed in any expression (not just properties) - floor/ceil are now identifiers, not keywords - equality and relational operators separated in priority - precedence: >, <, >=, <= now have priority over =, != - better but slightly different parsing of problem cases like "F<=a b" ----------------------------------------------------------------------------- Version 3.2.beta1 (released 25/2/2008) (svn: trunk rev 568) ----------------------------------------------------------------------------- * Fix to allow building on Mac OS X v10.5 (Leopard) * New option for displaying extra info during reachability (-extrareachinfo switch) * Addition of some missing reward model checking algorithms - instantaneous reward properties (R=?[I=k]) for DTMCs/MDPs (MTBDD/sparse engines only) - cumulative reward properties (R=?[C<=k]) for DTMCs - sparse engine version of reach reward properties (R=?[F...]) for MDPs * New option for displaying extra (MT)BDD info (-extraddinfo switch) * Font increase/decrease feature in GUI * Labels (for use in properties file) can be defined in the model file * Properties files can use formulas from model file * Partially correct property files can be loaded into the GUI * New icon set and graphics * New graph plotting engine using JFreeChart * Prototype SBML-to-PRISM translator * New option for -simpath feature: can enable/disable loop checking * New option for -simpath feature: generation of multiple paths to find deadlock * New "rows" option for matrix exports (-exportrows switch) * Support for 64-bit architectures * Addition of F and G operators to property language (eventually/globally) * Redesign of the simulator GUI, plus new features: - ability to display cumulated time/rewards - new "Configure view" dialog - easier selection of next step (double click) * Resizeable experiment results table ----------------------------------------------------------------------------- Version 3.1.1 (5/4/2007) (svn: derived from 3.1 tag) ----------------------------------------------------------------------------- * Minor bug fixes: - bug in "New Graph" dialog which fails on Java 6 - threading bug which can cause graph plotting to freeze - fix to possible failure of Windows launch scripts ----------------------------------------------------------------------------- Version 3.1 (15/11/2006) (svn: derived from 3.1.beta1 tag) ----------------------------------------------------------------------------- * No changes ----------------------------------------------------------------------------- Version 3.1.beta1 (3/11/2006) (svn: trunk rev 116) ----------------------------------------------------------------------------- * New installer for Windows binary * Models can now have multiple (named) reward structures * New -simpath switch for command-line generation of random paths with simulator * Minor PRISM language improvements: - type keyword does not need to be first thing in model file - doubles in exponential form (1.4e-9) and unary minus (-1) allowed * PRISM settings file now used by command-line version too * Small GUI improvements * New option to disable steady-state detection for CTMC transient analysis * Bug fixes ----------------------------------------------------------------------------- Version 3.0 (6/7/2006) (svn: trunk rev 55) ----------------------------------------------------------------------------- * Bug fixes ----------------------------------------------------------------------------- Version 3.0.beta1 (29/3/2006) (svn: trunk rev 45) ----------------------------------------------------------------------------- * Changes to export functionality - transition matrix graph can be exported to a Dot file (-exporttransdot) - can export state/transition rewards - can export labels and their satisfying states - can export to stdout/log instead of a file - can export in MRMC format - improved support for Matlab format export - exported matrices now ordered by default (by row) - new/rearranged command-line switches * Added new options to Model|View menu in GUI * Additional checks when parsing models: - synchronous commands modifying globals (now disallowed, previously just advised against) - modification of local variables by another module (previously detected later at build-time) * Improvements/changes to explicit import functionality: - -importstates understands Boolean variables now - -importinit option added - Default module variable (x) indexed from 0, not 1 * Non-convergence of iterative methods is an error, not a warning * Changed layout of simulator transition table (4 -> 3 columns) * Bugfixes * Makefile improvements ----------------------------------------------------------------------------- Version 2.1.dev11.sim8 (3/3/2006) ----------------------------------------------------------------------------- * Bug fix: computation of powers in simulator * Bug fix: calculation of transition rewards from multiple actions * Bug fixes: loop detection and deadlocks in simulator ----------------------------------------------------------------------------- Version 2.1.dev11.sim7 (5/1/2006) ----------------------------------------------------------------------------- * Bug fixes, tidying ----------------------------------------------------------------------------- Version 2.1.dev11.sim6 (16/12/2005) ----------------------------------------------------------------------------- * Merged with simulator branch * Improved options management including saving of user settings ----------------------------------------------------------------------------- Version 2.1.dev11 (5/12/2005) ----------------------------------------------------------------------------- Changes: * Bugfixes in GUI syntax highlighting, esp. for large model files * Bugfix: out-of-range initial values banned ----------------------------------------------------------------------------- Version 2.1.dev10 (21/10/2005) ----------------------------------------------------------------------------- Changes: * GUI syntax highlighting restructure and efficiency improvement * Bugfix/tidy in GUI experiments, esp. with Booleans * Bugfix/improvements in modulo operations * Improvements to checks of probabilities/rates, e.g. for NaN * Ability to disable checks of probabilities/rates ----------------------------------------------------------------------------- Version 2.1.dev9 (27/05/2005) ----------------------------------------------------------------------------- Changes: * Tidied up simulator code/stubs * Graphical model editor disabled ----------------------------------------------------------------------------- Version 2.1.dev8 (11/05/2005) ----------------------------------------------------------------------------- Changes: * Can now be built on OS X * Makefile improvements including better OS detection * Bug fix improving efficiency of BSCC computation * Improved reporting of multiple missing constants ----------------------------------------------------------------------------- Version 2.1.dev7 (22/2/2005) ----------------------------------------------------------------------------- Changes: * Graphical model editor (temporarily?) enabled * Addition of simulator code and stubs * Tweaked main Makefile: stops after first error ----------------------------------------------------------------------------- Version 2.1.dev6 (18/2/2005) ----------------------------------------------------------------------------- Changes: * Bug fix - alphabet for default synchronisation is now derived syntactically * Updates to some APMC code ----------------------------------------------------------------------------- Version 2.1.dev5 (11/2/2005) ----------------------------------------------------------------------------- Partially completed changes: * PRISM Preprocessor * Improved hybrid GS * Improved syntax highlighting Changes: * Max memory for Java VM modifiable via PRISM_JAVAMAXMEM environment variable * Reorganisation of Linux/Solaris launch scripts * New notation for functions in PRISM language: func(f,x,y) * New built-in functions in PRISM language (new notation only) - power(pow), modulo(mod) * Upgrade to newest version of CUDD (2.4.0) * GUI supports multi-line comments for properties * Command-line override of model type allowed (-dtmc,-ctmc,-mdp switches) * Tidy up of output generated by filters in P/S operators * Added built-in label "deadlock", true in states where deadlocks fixed by PRISM * Conditional evaluation operator now allows bracketless nesting, e.g. a?b:c?d:e * Bug fixes ----------------------------------------------------------------------------- Version 2.1.dev4 (21/1/2005) ----------------------------------------------------------------------------- Changes: * New syntax for transition rewards (within rewards construct) * Bugfix in Prob1A precomputation algorithm * Bugfix: disappearing "{min}"/"{max}" from P/R operators * Numerous improvements to graph plotting tool - Export of graphs to Matlab - Import/export of graphs from/to XML - Enhanced scale behaviour/options - Improved editing of series properties/data - Various bug fixes * More thorough checks of commands during model construction - each command must define transitions for all states satisfying guard ----------------------------------------------------------------------------- Version 2.1.dev3 (17/11/2004) ----------------------------------------------------------------------------- Partially completed changes: * Graphical model editor significantly improved (but disabled for now) Changes: * Support for import of (explicit) transition matrix and state space (command-line only, via -importtrans/-importstates switches (and -dtmc,-ctmc,-mdp)) * Improvements to graph plotting functionality * Log in GUI now operates with a limited size buffer to avoid out-of-memory problems ----------------------------------------------------------------------------- Version 2.1.dev2 (20/10/2004) ----------------------------------------------------------------------------- Partially completed changes: * Support for costs/rewards - DTMC: R[F] H/S/M - MDP: R[F] M ok, H partial - CTMC: R[F] H/S/M, R[I=t] H/S/M, R[S] H/S/M, C[<=t] H/S/M Changes: * Added facility to compute transient probabilities ----------------------------------------------------------------------------- Version 2.1.dev1 (7/10/2004) ----------------------------------------------------------------------------- Partially completed changes: * Support for costs/rewards * Checks during model construction that rates are non-negative and probabilities sum to one Changes: * Multiple initial states init...endinit * Support for displaying min/max of a range of probabilities using {} notation * New "compact" storage schemes (distinct values only) added to sparse/hybrid engines * Sparse storage schemes now use (more compact) counts instead of start indices for rows/cols * True Gauss-Seidel algorithm for hybrid engine * New switches (-pgs, -psor, -bpgs, -bpsor) to access hybrid "psuedo" methods * Language modification: updates can be "true", i.e. no variables change * Added conditional evaluation operator (cond ? then : else) to PRISM language ----------------------------------------------------------------------------- Version 2.1 (released 8/9/2004) ----------------------------------------------------------------------------- Changes: * Now possible to build/run PRISM on Windows * Compilation/installation procedures slightly simplified * Splash screen on load ----------------------------------------------------------------------------- Version 2.0 (released 17/3/2004) ----------------------------------------------------------------------------- Changes: * Completely new graphical user interface, including: - Text editor for PRISM language - Automated results collection/graph plotting * Enhancements to PRISM language: - Types (ints, doubles and booleans) and type checking added - Probabilities/rates can now be expressions - Variable ranges/initial values can now be expressions - Constant/formula definitions can be expressions (including in terms of each other) - Process algebra style definitions allowed for MDPs too (via "system" construct) * Enhancements to property specifications: - Probability/time bounds in PCTL/CSL properties can now be expressions - Use of constants now permitted: both those from the model and newly declared ones - Added "init" keyword to PCTL/CSL (atomic proposition true only in initial state) - Can define and reuse "labels" (atomic propositions) (like formulas in model files) - Can write properties of the form "P=?[...]" which return the actual probability * Additional features: - Automatic handling of multiple model checking computations, e.g. check "P~p[true U<=k error]" for k=1..100 - Added -exportstates switch, exports reachable states to text file - Added -nobscc switch for optional bypass of BSCC computation - Added explicit versions of export options (including first export option for MDPs) - Export options can now be used in conjunction with each other and with model checking - Added -version switch to display version * Efficiency improvements - Improved heuristics for hybrid engine (sb/sbmax/gsl switches -> sbmax/sbl/gsmax/gsl) - More efficient construction process for unstructured models - General restructuring/improvements to model construction process implementation * Miscellaneous - Various bug fixes - Fairness (for MDP model checking) now OFF by default (used to be ON) ----------------------------------------------------------------------------- Version 1.3.1 (released 20/2/2003) ----------------------------------------------------------------------------- Changes: * Bug fixes in model construction code ----------------------------------------------------------------------------- Version 1.3 (released 10/2/2003) ----------------------------------------------------------------------------- Changes: * Steady-state probability computation improved to include strongly connected component (SCC) computation * Extended support for CSL time-bounded until operator to include arbitrary intervals * More flexible parallel composition options in the PRISM language (for DTMCs and CTMCs) * Added option to import PEPA process algebra descriptions as models * Improved range of numerical methods: (Backwards) Gauss-Seidel and (Backwards) SOR (plus variants for hybrid engine) * Added -pctl/-csl switches to allow command line specification of properties * Improved handling of deadlock states: can add self-loops to these states automatically (e.g. -fixdl switch) * Steady-state probabilities are no longer automatically computed for CTMCs: use the -ss switch * Addition of {} operator to PCTL/CSL formulas to support printing of probabilities * Resolved problem with PRISM language syntax: updates must now be parenthesised * Default value for maximum number of iterations reduced from 500,000 to (more sensible) 10,000 * Added switches to control CUDD behaviour (-cuddmaxmem, -cuddepsilon) * Additional example files * Numerous bug fixes * Now released under the GPL license ----------------------------------------------------------------------------- Version 1.2 (released 17/9/2001) ----------------------------------------------------------------------------- First public release