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postproc: add support for -x dpa-simul and simul-trans-pruning

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Also have simul-max default to 4096 instead of 512, because it's
really simul-trans-pruning that is very slow and need to be limited.

* spot/twaalgos/postproc.cc, spot/twaalgos/postproc.hh,
spot/twaalgos/simulation.cc, spot/twaalgos/simulation.hh,
spot/twaalgos/determinize.cc, spot/twaalgos/determinize.hh:
Implement the above options.
* bin/spot-x.cc, NEWS: Document them.
* tests/core/ltlsynt.test, tests/core/minusx.test,
tests/core/sim3.test: Add some test cases.
This commit is contained in:
Alexandre Duret-Lutz 2021-04-29 17:24:26 +02:00
parent fca6513604
commit d32f19f5d0
11 changed files with 210 additions and 101 deletions
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46
NEWS
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@ -129,36 +129,50 @@ New in spot 2.9.6.dev (not yet released)
- print_dot() will display states from player 1 using a diamond
shape.
- spot::postproc has two extra configuration variables that are meant
to speedup the processing of large automata.
- spot::postproc has new configuration variables that define
thresholds to disable some costly operation in order to speedup
the processing of large automata. (Those variables are typically
modified using the -x option of command-line tools, and are all
documented in the spot-x(7) man page.)
simul-max Number of states above which simulation-based
reductions are skipped. Defaults to 512. Set to 0
to disable. This also applies to the
simulation-based optimization of the
determinization algorithm.
wdba-det-max Maximum number of additional states allowed in
intermediate steps of WDBA-minimization. If the
intermediate steps of WDBA-minimization. If the
number of additional states reached in the
powerset construction or in the followup products
exceeds this value, WDBA-minimization is aborted.
Defaults to 4096. Set to 0 to disable. This limit
Defaults to 4096. Set to 0 to disable. This limit
is ignored when -D used or when det-max-states is
set.
The reason for disabling simulation-based reduction above 512
states is that the current implementation uses one BDD variable
per state, and makes a number of BDD operations that is quadratic
in the number of states. Similarly, WDBA-mininimization is used
with --small in the off chance that it might produce a smaller
automaton, but we should not waste too much space and time trying
that.
simul-max Number of states above which simulation-based
reductions are skipped. Defaults to 4096. Set
to 0 to disable. This also applies to the
simulation-based optimization of the
determinization algorithm.
simul-trans-pruning
For simulation-based reduction, this is the
number of equivalence classes above which
transition-pruning for non-deterministic automata
is disabled. Defaults to 512. Set to 0 to
disable. This applies to all simulation-based
reduction, as well as to the simulation-based
optimization of the determinization algorithm.
Simulation-based reduction perform a number of
BDD implication checks that is quadratic in the
number of classes to implement transition pruning.
dpa-simul Set to 0/1 to disable/enable simulation-based
reduction performed after running a Safra-like
determinization to optain a DPA. By default, it
is activated at all levels but --low.
spot::translator additionally honor the following new variables:
tls-max-states Maximum number of states of automata involved in
automata-based implication checks for formula
simplifications. Defaults to 64.
exprop When set, this causes the core LTL translation to
explicitly iterate over all possible valuations of
atomic propositions when considering the successors