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depth splitting now applies to greedy+frugal unless specified otherwise

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This commit is contained in:
Ilana Shapiro 2025-08-26 20:07:24 -07:00
parent c010a38244
commit 5c2f244a85
3 changed files with 19 additions and 11 deletions
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2
src/params/smt_parallel_params.pyg
View file

@ -13,6 +13,6 @@ def_module_params('smt_parallel',
('max_cube_depth', UINT, 20, 'maximum depth (size) of a cube to share'),
('max_greedy_cubes', UINT, 1000, 'maximum number of cube to greedily share before switching to frugal'),
('num_split_lits', UINT, 2, 'how many literals, k, we split on to create 2^k cubes'),
('frugal_depth_splitting_only', BOOL, False, 'only apply frugal cube strategy, and only on deepest (biggest) cubes from the batch manager'),
('depth_splitting_only', BOOL, False, 'only apply frugal cube strategy, and only on deepest (biggest) cubes from the batch manager'),
('backbone_detection', BOOL, False, 'apply backbone literal heuristic'),
))

26
src/smt/smt_parallel.cpp
View file

@ -295,7 +295,7 @@ namespace smt {
}
for (unsigned i = 0; i < std::min(m_max_batch_size / p.num_threads, (unsigned)m_cubes.size()) && !m_cubes.empty(); ++i) {
if (m_config.m_frugal_depth_splitting_only) {
if (m_config.m_depth_splitting_only) {
// get the deepest set of cubes
auto& deepest_cubes = m_cubes_depth_sets.rbegin()->second;
unsigned idx = rand() % deepest_cubes.size();
@ -374,7 +374,7 @@ namespace smt {
return l_undef; // the main context was cancelled, so we return undef.
switch (m_state) {
case state::is_running: // batch manager is still running, but all threads have processed their cubes, which means all cubes were unsat
if (!m_cubes.empty() || (m_config.m_frugal_depth_splitting_only && !m_cubes_depth_sets.empty()))
if (!m_cubes.empty() || (m_config.m_depth_splitting_only && !m_cubes_depth_sets.empty()))
throw default_exception("inconsistent end state");
if (!p.m_assumptions_used.empty()) {
// collect unsat core from assumptions used, if any --> case when all cubes were unsat, but depend on nonempty asms, so we need to add these asms to final unsat core
@ -501,7 +501,7 @@ namespace smt {
std::scoped_lock lock(mux);
unsigned max_greedy_cubes = 1000;
bool greedy_mode = (m_cubes.size() <= max_greedy_cubes) && !m_config.m_frugal_cube_only && !m_config.m_frugal_depth_splitting_only;
bool greedy_mode = (m_cubes.size() <= max_greedy_cubes) && !m_config.m_frugal_cube_only;
unsigned a_worker_start_idx = 0;
//
@ -514,7 +514,11 @@ namespace smt {
continue;
m_split_atoms.push_back(g_atom);
add_split_atom(g_atom, 0); // split all *existing* cubes
if (m_config.m_depth_splitting_only) {
add_split_atom_deepest_cubes(g_atom); // split all *existing* cubes in the depth sets data structure
} else {
add_split_atom(g_atom, 0); // split all *existing* cubes
}
if (m_cubes.size() > max_greedy_cubes) {
greedy_mode = false;
++a_worker_start_idx; // start frugal from here
@ -532,7 +536,7 @@ namespace smt {
g_cube.push_back(l2g(atom));
unsigned start = m_cubes.size(); // update start after adding each cube so we only process the current cube being added
if (m_config.m_frugal_depth_splitting_only) {
if (m_config.m_depth_splitting_only) {
// need to add the depth set if it doesn't exist yet
if (m_cubes_depth_sets.find(g_cube.size()) == m_cubes_depth_sets.end()) {
m_cubes_depth_sets[g_cube.size()] = vector<expr_ref_vector>();
@ -548,7 +552,11 @@ namespace smt {
// Split new cube on all existing m_split_atoms not in it
for (auto g_atom : m_split_atoms) {
if (!atom_in_cube(g_cube, g_atom)) {
add_split_atom(g_atom, start);
if (m_config.m_depth_splitting_only) {
add_split_atom_deepest_cubes(g_atom); // split all *existing* cubes in the depth sets data structure
} else {
add_split_atom(g_atom, 0); // split all *existing* cubes
}
if (m_cubes.size() > max_greedy_cubes) {
greedy_mode = false;
break;
@ -564,7 +572,7 @@ namespace smt {
expr_ref g_atom(l2g(A_worker[i]), l2g.to());
if (!m_split_atoms.contains(g_atom))
m_split_atoms.push_back(g_atom);
if (m_config.m_frugal_depth_splitting_only) {
if (m_config.m_depth_splitting_only) {
add_split_atom_deepest_cubes(g_atom);
} else {
add_split_atom(g_atom, initial_m_cubes_size);
@ -738,7 +746,7 @@ namespace smt {
m_cubes.reset();
m_cubes.push_back(expr_ref_vector(m)); // push empty cube
if (m_config.m_frugal_depth_splitting_only) {
if (m_config.m_depth_splitting_only) {
m_cubes_depth_sets.clear();
}
@ -747,7 +755,7 @@ namespace smt {
m_config.m_max_cube_depth = sp.max_cube_depth();
m_config.m_frugal_cube_only = sp.frugal_cube_only();
m_config.m_never_cube = sp.never_cube();
m_config.m_frugal_depth_splitting_only = sp.frugal_depth_splitting_only();
m_config.m_depth_splitting_only = sp.depth_splitting_only();
}
void parallel::batch_manager::collect_statistics(::statistics& st) const {

2
src/smt/smt_parallel.h
View file

@ -50,7 +50,7 @@ namespace smt {
unsigned m_max_cube_depth = 20;
bool m_frugal_cube_only = false;
bool m_never_cube = false;
bool m_frugal_depth_splitting_only = false;
bool m_depth_splitting_only = false;
};
struct stats {
unsigned m_max_cube_depth = 0;