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506 lines
21 KiB
506 lines
21 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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Latest changes (mostly reverse chronological):
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[correct wrt svn rev 3510]
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* Fixed anti-aliasing in GUI model editor
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* Better handling of undefined constants in properties
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* Added -exportprodtrans and -exportprodstates switches
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* Bug fixes
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Ongoing changes:
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* Properties can be named, by prefixing with "name":, and reference each other
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* More improvements to explicit engine
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* CTL AG/EF
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-----------------------------------------------------------------------------
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Version 4.0.1 (released ...)
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-----------------------------------------------------------------------------
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* Added if-and-only-if operator (<=>) for use in models/properties
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* Updated version of explicit model checking library
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* Testing mode (-test and -testall switches)
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* Various bug fixes
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-----------------------------------------------------------------------------
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Version 4.0 (released 28/6/2011)
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-----------------------------------------------------------------------------
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* Support for probabilistic timed automata (PTAs)
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- new modelling language features: clocks, invariants
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- model checking of timed/untimed probabilistic reachability properties
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- two model checking engines: abstraction-refinement, digital clocks
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- support for expected reward properties (i.e. priced PTAs)
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* New approximate/statistical model checking functionality
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- additional confidence-interval (CI) based approximation methods
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- acceptance sampling: sequential probabilistic ratio test (SPRT) method
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* Optimal adversary generation for MDPs
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- and for PTAs, via digital clocks engine
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* Improvements to the property language and model checking
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- enhanced filters for property result processing
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- new, clearer reporting of results from PRISM
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* Improved model export functionality
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- option to include state information in dot files (e.g. -exporttransdotstates)
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- action labels included in dot/transition matrix exports
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- clearer for file export for MDPs
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* Additional functionality for transient/steady-state probabilities
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- option to specify initial distribution for transient analysis
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- option to export steady-state/transient probabilities to a file
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* New components/libraries for developers:
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- completely re-written discrete-event simulation engine
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- explicit-state probabilistic model checking library
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- a quantitative abstraction-refinement engine
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* Other improvements/additions:
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- Strict upper time-bounds allowed in properties
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- Formulas used in properties are left unexpanded for legibility
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- Added check for existence of zero-reward loops in MDPs
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- New -exportprism/-exportprismconst/-nobuild switches
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- New -exporttarget switch
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- New versions of jcommon (1.0.16) and jfreechart (1.0.13)
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* Changes since 4.0.beta2 (released 10/6/2011)
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- None
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* Changes since 4.0.beta (released 16/12/2010)
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- Bug fixes: simulator, error messages, typos and examples)
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-----------------------------------------------------------------------------
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Version 3.3.1 (released 22/11/2009)
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-----------------------------------------------------------------------------
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* Bug fixes:
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- Building on new 64-bit Macs
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- Simulator bug (crashes on min/max function)
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- CTMC transient probs with MTBDD engine crash
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- State/transition reward mix-up in parser
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- Approximate verification of lower time-bounded properties for CTMCs
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-----------------------------------------------------------------------------
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Version 3.3 (released 29/10/2009)
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-----------------------------------------------------------------------------
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* Bug fixes:
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- Building on new Macs
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- Copy+paste bug in GUI
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-----------------------------------------------------------------------------
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Version 3.3.beta2 (released 29/7/2009)
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-----------------------------------------------------------------------------
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* Bug fixes:
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- LTL model checking (svn: 1112, 1132)
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- Approximate model checking (svn: 1214)
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- Building on new Macs (svn: 1103, 1105, 1349)
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-----------------------------------------------------------------------------
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Version 3.3.beta1 (released 20/5/2009) (svn: trunk rev 1066)
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-----------------------------------------------------------------------------
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* New language parser:
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- improved efficiency, especially on large/complex models
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- more accurate error reporting
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* GUI model editor improvements:
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- error highlighting
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- line numbers
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- undo/redo feature
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* Expanded property specification language
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- LTL (and PCTL*) now supported
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- arbitrary expressions allowed, e.g. 1-P=?[...]
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- support for weak until (W) and release (R) added
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- steady-state operators (S=?[...], R=?[S]) allowed for DTMCs
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- optional semicolons to terminate properties in properties files
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* Modelling language changes:
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- cleaner notation for functions, e.g. mod(i,n), not func(mod,i,n)
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- function names can be renamed in module renaming
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- language strictness: updates (x'=...) must be parenthesised
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- ranges (x=1..3,5) no longer supported
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- added conversion tool for old models (etc/scripts/prism3to4)
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* Other minor technical changes to language:
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- implication allowed in any expression (not just properties)
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- floor/ceil are now identifiers, not keywords
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- relational operators now have precedence over equality operators
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- better but slightly different parsing of problem cases like "F<=a b"
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* Improvements to memory handling, especially in sparse/hybrid engines
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* Updated JFreeChart library
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* Multiple -const switches allowed at command-line
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* Efficiency improvements to precomputation algorithms
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* Added symmetry reduction functionality
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* New -exportbsccs option
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* Initial state info for explicit import is now via -importlabels
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* Added prism2html/prism2latex tools (in etc/scripts)
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* Sparse/hybrid versions of instantaneous reward properties (R=?[I=k]) for DTMCs
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* Easier viewing of model checking results in GUI
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* Steady-state/transient probability computation for DTMCs
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-----------------------------------------------------------------------------
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Version 3.2.beta1 (released 25/2/2008) (svn: trunk rev 568)
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-----------------------------------------------------------------------------
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* Fix to allow building on Mac OS X v10.5 (Leopard)
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* New option for displaying extra info during reachability (-extrareachinfo switch)
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* Addition of some missing reward model checking algorithms
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- instantaneous reward properties (R=?[I=k]) for DTMCs/MDPs (MTBDD/sparse engines only)
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- cumulative reward properties (R=?[C<=k]) for DTMCs
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- sparse engine version of reach reward properties (R=?[F...]) for MDPs
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* New option for displaying extra (MT)BDD info (-extraddinfo switch)
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* Font increase/decrease feature in GUI
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* Labels (for use in properties file) can be defined in the model file
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* Properties files can use formulas from model file
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* Partially correct property files can be loaded into the GUI
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* New icon set and graphics
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* New graph plotting engine using JFreeChart
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* Prototype SBML-to-PRISM translator
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* New option for -simpath feature: can enable/disable loop checking
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* New option for -simpath feature: generation of multiple paths to find deadlock
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* New "rows" option for matrix exports (-exportrows switch)
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* Support for 64-bit architectures
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* Addition of F and G operators to property language (eventually/globally)
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* Redesign of the simulator GUI, plus new features:
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- ability to display cumulated time/rewards
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- new "Configure view" dialog
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- easier selection of next step (double click)
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* Resizeable experiment results table
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* Function "log" for use in expressions
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-----------------------------------------------------------------------------
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Version 3.1.1 (5/4/2007) (svn: derived from 3.1 tag)
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-----------------------------------------------------------------------------
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* Minor bug fixes:
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- bug in "New Graph" dialog which fails on Java 6
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- threading bug which can cause graph plotting to freeze
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- fix to possible failure of Windows launch scripts
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-----------------------------------------------------------------------------
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Version 3.1 (15/11/2006) (svn: derived from 3.1.beta1 tag)
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-----------------------------------------------------------------------------
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* No changes
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-----------------------------------------------------------------------------
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Version 3.1.beta1 (3/11/2006) (svn: trunk rev 116)
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-----------------------------------------------------------------------------
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* New installer for Windows binary
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* Models can now have multiple (named) reward structures
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* New -simpath switch for command-line generation of random paths with simulator
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* Minor PRISM language improvements:
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- type keyword does not need to be first thing in model file
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- doubles in exponential form (1.4e-9) and unary minus (-1) allowed
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* PRISM settings file now used by command-line version too
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* Small GUI improvements
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* New option to disable steady-state detection for CTMC transient analysis
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* Bug fixes
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-----------------------------------------------------------------------------
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Version 3.0 (6/7/2006) (svn: trunk rev 55)
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-----------------------------------------------------------------------------
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* Bug fixes
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-----------------------------------------------------------------------------
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Version 3.0.beta1 (29/3/2006) (svn: trunk rev 45)
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-----------------------------------------------------------------------------
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* Changes to export functionality
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- transition matrix graph can be exported to a Dot file (-exporttransdot)
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- can export state/transition rewards
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- can export labels and their satisfying states
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- can export to stdout/log instead of a file
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- can export in MRMC format
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- improved support for Matlab format export
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- exported matrices now ordered by default (by row)
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- new/rearranged command-line switches
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* Added new options to Model|View menu in GUI
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* Additional checks when parsing models:
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- synchronous commands modifying globals
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(now disallowed, previously just advised against)
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- modification of local variables by another module
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(previously detected later at build-time)
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* Improvements/changes to explicit import functionality:
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- -importstates understands Boolean variables now
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- -importinit option added
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- Default module variable (x) indexed from 0, not 1
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* Non-convergence of iterative methods is an error, not a warning
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* Changed layout of simulator transition table (4 -> 3 columns)
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* Bugfixes
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* Makefile improvements
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-----------------------------------------------------------------------------
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Version 2.1.dev11.sim8 (3/3/2006)
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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 (5/1/2006)
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-----------------------------------------------------------------------------
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* Bug fixes, tidying
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-----------------------------------------------------------------------------
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Version 2.1.dev11.sim6 (16/12/2005)
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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 (5/12/2005)
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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 (21/10/2005)
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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 (27/05/2005)
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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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