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add restart.max parameter to control cancellation based on restart count

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-12-25 17:43:47 -08:00
parent 2bd29548da
commit aaf6e67ec8
6 changed files with 14 additions and 3 deletions
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1
src/opt/opt_solver.cpp
View file

@ -47,7 +47,6 @@ namespace opt {
m_first(true),
m_was_unknown(false) {
m_params.updt_params(p);
std::cout << "Case split strategy " << m_params.m_case_split_strategy << "\n";
if (m_params.m_case_split_strategy == CS_ACTIVITY_DELAY_NEW) {
m_params.m_relevancy_lvl = 0;
}

4
src/sat/sat_config.cpp
View file

@ -26,6 +26,7 @@ namespace sat {
m_always_true("always_true"),
m_always_false("always_false"),
m_caching("caching"),
m_restart_max(0),
m_random("random"),
m_geometric("geometric"),
m_luby("luby"),
@ -66,7 +67,8 @@ namespace sat {
m_restart_initial = p.restart_initial();
m_restart_factor = p.restart_factor();
m_restart_max = p.restart_max();
m_random_freq = p.random_freq();
m_random_seed = p.random_seed();
if (m_random_seed == 0)

1
src/sat/sat_config.h
View file

@ -52,6 +52,7 @@ namespace sat {
restart_strategy m_restart;
unsigned m_restart_initial;
double m_restart_factor; // for geometric case
unsigned m_restart_max;
double m_random_freq;
unsigned m_random_seed;
unsigned m_burst_search;

1
src/sat/sat_params.pyg
View file

@ -7,6 +7,7 @@ def_module_params('sat',
('phase.caching.off', UINT, 100, 'phase caching off period (in number of conflicts)'),
('restart', SYMBOL, 'luby', 'restart strategy: luby or geometric'),
('restart.initial', UINT, 100, 'initial restart (number of conflicts)'),
('restart.max', UINT, 0, 'maximal number of restarts. Ignored if set to 0'),
('restart.factor', DOUBLE, 1.5, 'restart increment factor for geometric strategy'),
('random_freq', DOUBLE, 0.01, 'frequency of random case splits'),
('random_seed', UINT, 0, 'random seed'),

9
src/sat/sat_solver.cpp
View file

@ -744,7 +744,6 @@ namespace sat {
simplify_problem();
if (check_inconsistent()) return l_false;
if (m_config.m_max_conflicts == 0) {
IF_VERBOSE(SAT_VB_LVL, verbose_stream() << "(sat \"abort: max-conflicts = 0\")\n";);
return l_undef;
@ -766,6 +765,12 @@ namespace sat {
simplify_problem();
if (check_inconsistent()) return l_false;
gc();
if (m_config.m_restart_max != 0 && m_config.m_restart_max <= m_restarts) {
IF_VERBOSE(SAT_VB_LVL, verbose_stream() << "(sat \"abort: max-restarts\")\n";);
return l_undef;
}
}
}
catch (abort_solver) {
@ -1126,6 +1131,7 @@ namespace sat {
m_restart_threshold = m_config.m_restart_initial;
m_luby_idx = 1;
m_gc_threshold = m_config.m_gc_initial;
m_restarts = 0;
m_min_d_tk = 1.0;
m_stopwatch.reset();
m_stopwatch.start();
@ -1308,6 +1314,7 @@ namespace sat {
void solver::restart() {
m_stats.m_restart++;
m_restarts++;
IF_VERBOSE(1,
verbose_stream() << "(sat-restart :conflicts " << m_stats.m_conflict << " :decisions " << m_stats.m_decision
<< " :restarts " << m_stats.m_restart << mk_stat(*this)

1
src/sat/sat_solver.h
View file

@ -293,6 +293,7 @@ namespace sat {
protected:
unsigned m_conflicts;
unsigned m_restarts;
unsigned m_conflicts_since_restart;
unsigned m_restart_threshold;
unsigned m_luby_idx;