mirror of
https://github.com/Z3Prover/z3
synced 2025-11-13 01:21:14 +00:00
47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
/*++
|
|
Copyright (c) 2021 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
Restart
|
|
|
|
Author:
|
|
|
|
Jakob Rath, Nikolaj Bjorner (nbjorner) 2021-12-12
|
|
|
|
|
|
--*/
|
|
#include "math/polysat/solver.h"
|
|
#include "math/polysat/restart.h"
|
|
#include "util/luby.h"
|
|
|
|
namespace polysat {
|
|
|
|
restart::restart(solver& s):
|
|
s(s)
|
|
{}
|
|
|
|
/*
|
|
* Basic restart functionality.
|
|
* restarts make more sense when the order of variable
|
|
* assignments and the values assigned to variables can be diversified.
|
|
*/
|
|
bool restart::should_apply() const {
|
|
if (s.m_stats.m_num_conflicts - m_conflicts_at_restart < m_restart_threshold)
|
|
return false;
|
|
if (s.base_level() + 2 > s.m_level)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
void restart::operator()() {
|
|
LOG_H2("Restarting");
|
|
++s.m_stats.m_num_restarts;
|
|
s.pop_levels(s.m_level - s.base_level());
|
|
m_conflicts_at_restart = s.m_stats.m_num_conflicts;
|
|
m_restart_threshold = m_restart_init * get_luby(++m_luby_idx);
|
|
IF_VERBOSE(10, verbose_stream() << "Restart with Conflict #" << s.m_stats.m_num_conflicts << "\n";);
|
|
s.randomize_activity();
|
|
}
|
|
|
|
}
|