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update smt-parallel

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2025-09-19 19:22:09 -07:00
parent f12d751007
commit 7eb6ef3161
3 changed files with 189 additions and 267 deletions
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14
.clang-format
View file

@ -1,3 +1,4 @@
# Z3 Theorem Prover clang-format configuration
# Based on analysis of existing codebase style patterns
@ -12,7 +13,6 @@ UseTab: Never
ColumnLimit: 120
# Braces
BreakBeforeBraces: Linux
Cpp11BracedListStyle: true
# Classes and structs
@ -25,7 +25,15 @@ AlwaysBreakAfterReturnType: None
AllowShortFunctionsOnASingleLine: Empty
AllowShortIfStatementsOnASingleLine: false
AllowShortLoopsOnASingleLine: false
# Ensure function-opening brace is attached to the signature
BreakBeforeBraces: Custom
# Explicitly ensure function brace is not placed on a new line
BraceWrapping:
AfterFunction: false
AfterClass: false
AfterControlStatement: false
AfterNamespace: false
AfterStruct: false
# Spacing
SpaceAfterCStyleCast: false
SpaceAfterLogicalNot: false
@ -52,7 +60,7 @@ BreakBeforeTernaryOperators: true
SortIncludes: false # Z3 has specific include ordering conventions
# Namespaces
NamespaceIndentation: None
NamespaceIndentation: All
# Comments and documentation
ReflowComments: true

148
src/smt/smt_parallel.cpp
View file

@ -12,12 +12,10 @@ Abstract:
Author:
nbjorner 2020-01-31
Ilana Shapiro 2025
--*/
#include "util/scoped_ptr_vector.h"
#include "ast/ast_util.h"
#include "ast/ast_pp.h"
@ -26,15 +24,14 @@ Author:
#include "ast/simplifiers/then_simplifier.h"
#include "smt/smt_parallel.h"
#include "smt/smt_lookahead.h"
// #include "params/smt_parallel_params.hpp"
#include "solver/solver_preprocess.h"
#include <cmath>
#include <condition_variable>
#include <mutex>
class bounded_pp_exprs {
expr_ref_vector const &es;
public:
bounded_pp_exprs(expr_ref_vector const &es) : es(es) {}
@ -56,13 +53,11 @@ namespace smt {
lbool parallel::operator()(expr_ref_vector const &asms) {
return l_undef;
}
}
} // namespace smt
#else
#include <thread>
#include <mutex>
#include <condition_variable>
#define SHARE_SEARCH_TREE 1
@ -70,23 +65,15 @@ namespace smt {
namespace smt {
void parallel::worker::run() {
search_tree::node<cube_config> *node = nullptr;
expr_ref_vector cube(m);
while (true) {
#if SHARE_SEARCH_TREE
if (!b.get_cube(m_g2l, id, cube, node)) {
LOG_WORKER(1, " no more cubes\n");
return;
}
#else
if (!get_cube(cube, node))
return;
#endif
collect_shared_clauses(m_g2l);
check_cube_start:
@ -111,11 +98,7 @@ namespace smt {
auto atom = get_split_atom();
if (!atom)
goto check_cube_start;
#if SHARE_SEARCH_TREE
b.split(m_l2g, id, node, atom);
#else
split(node, atom);
#endif
simplify();
break;
}
@ -128,7 +111,8 @@ namespace smt {
}
case l_false: {
expr_ref_vector const &unsat_core = ctx->unsat_core();
LOG_WORKER(2, " unsat core:\n"; for (auto c : unsat_core) verbose_stream() << mk_bounded_pp(c, m, 3) << "\n");
LOG_WORKER(2, " unsat core:\n";
for (auto c : unsat_core) verbose_stream() << mk_bounded_pp(c, m, 3) << "\n");
// If the unsat core only contains external assumptions,
// unsatisfiability does not depend on the current cube and the entire problem is unsat.
if (all_of(unsat_core, [&](expr *e) { return asms.contains(e); })) {
@ -138,14 +122,11 @@ namespace smt {
}
for (expr *e : unsat_core)
if (asms.contains(e))
b.report_assumption_used(m_l2g, e); // report assumptions used in unsat core, so they can be used in final core
b.report_assumption_used(
m_l2g, e); // report assumptions used in unsat core, so they can be used in final core
LOG_WORKER(1, " found unsat cube\n");
#if SHARE_SEARCH_TREE
b.backtrack(m_l2g, unsat_core, node);
#else
backtrack(unsat_core, node);
#endif
break;
}
}
@ -154,43 +135,9 @@ namespace smt {
}
}
bool parallel::worker::get_cube(expr_ref_vector& cube, node*& n) {
node* t = m_search_tree.activate_node(n);
cube.reset();
if (!t) {
b.set_unsat(m_l2g, cube);
return false;
}
n = t;
while (t) {
if (cube_config::literal_is_null(t->get_literal()))
break;
cube.push_back(t->get_literal());
t = t->parent();
}
return true;
}
void parallel::worker::backtrack(expr_ref_vector const& core, node* n) {
vector<expr_ref> core_copy;
for (auto c : core)
core_copy.push_back(expr_ref(c, m));
m_search_tree.backtrack(n, core_copy);
//LOG_WORKER(1, m_search_tree.display(verbose_stream() << bounded_pp_exprs(core) << "\n"););
}
void parallel::worker::split(node* n, expr* atom) {
expr_ref lit(atom, m), nlit(m);
nlit = mk_not(m, lit);
IF_VERBOSE(1, verbose_stream() << "Batch manager splitting on literal: " << mk_bounded_pp(lit, m, 3) << "\n");
m_search_tree.split(n, lit, nlit);
}
parallel::worker::worker(unsigned id, parallel& p, expr_ref_vector const& _asms):
id(id), p(p), b(p.m_batch_manager), m_smt_params(p.ctx.get_fparams()), asms(m),
m_g2l(p.ctx.m, m),
m_l2g(m, p.ctx.m),
m_search_tree(expr_ref(m)) {
parallel::worker::worker(unsigned id, parallel &p, expr_ref_vector const &_asms)
: id(id), p(p), b(p.m_batch_manager), m_smt_params(p.ctx.get_fparams()), asms(m), m_g2l(p.ctx.m, m),
m_l2g(m, p.ctx.m), m_search_tree(expr_ref(m)) {
for (auto e : _asms)
asms.push_back(m_g2l(e));
LOG_WORKER(1, " created with " << asms.size() << " assumptions\n");
@ -198,34 +145,9 @@ namespace smt {
ctx = alloc(context, m, m_smt_params, p.ctx.get_params());
context::copy(p.ctx, *ctx, true);
ctx->set_random_seed(id + m_smt_params.m_random_seed);
#if 0
smt_parallel_params pp(p.ctx.m_params);
m_config.m_threads_max_conflicts = ctx->get_fparams().m_threads_max_conflicts;
m_config.m_max_conflicts = ctx->get_fparams().m_max_conflicts;
m_config.m_relevant_units_only = pp.relevant_units_only();
m_config.m_never_cube = pp.never_cube();
m_config.m_share_conflicts = pp.share_conflicts();
m_config.m_share_units = pp.share_units();
m_config.m_share_units_initial_only = pp.share_units_initial_only();
m_config.m_cube_initial_only = pp.cube_initial_only();
m_config.m_max_conflict_mul = pp.max_conflict_mul();
m_config.m_max_greedy_cubes = pp.max_greedy_cubes();
m_config.m_num_split_lits = pp.num_split_lits();
m_config.m_backbone_detection = pp.backbone_detection();
m_config.m_iterative_deepening = pp.iterative_deepening();
m_config.m_beam_search = pp.beam_search();
m_config.m_explicit_hardness = pp.explicit_hardness();
m_config.m_cubetree = pp.cubetree();
m_config.m_max_cube_depth = pp.max_cube_depth();
m_config.m_inprocessing = pp.inprocessing();
m_config.m_inprocessing_delay = pp.inprocessing_delay();
#endif
// don't share initial units
ctx->pop_to_base_lvl();
m_num_shared_units = ctx->assigned_literals().size();
m_num_initial_atoms = ctx->get_num_bool_vars();
}
@ -254,8 +176,6 @@ namespace smt {
m_num_shared_units = sz;
}
void parallel::worker::simplify() {
if (!m.inc())
return;
@ -274,6 +194,9 @@ namespace smt {
--m_config.m_inprocessing_delay;
return;
}
ctx->pop_to_base_lvl();
if (ctx->m_base_lvl > 0)
return; // simplification only at base level
m_config.m_inprocessing = false; // initial strategy is to immediately disable inprocessing for future calls.
dependent_expr_simplifier *s = ctx->m_simplifier.get();
if (!s) {
@ -286,7 +209,6 @@ namespace smt {
init_preprocess(m, ctx->get_params(), *then_s, *ctx->m_fmls);
}
dependent_expr_state &fmls = *ctx->m_fmls.get();
// extract assertions from ctx.
// it is possible to track proof objects here if wanted.
@ -303,8 +225,6 @@ namespace smt {
// run in-processing on the assertions
s->reduce();
// LOG_WORKER(1, ""; fmls.display(verbose_stream() << " inprocess result\n"););
scoped_ptr<context> new_ctx = alloc(context, m, m_smt_params, p.ctx.get_params());
// extract simplified assertions from the simplifier
// create a new context with the simplified assertions
@ -313,19 +233,18 @@ namespace smt {
auto const &de = fmls[i];
new_ctx->assert_expr(de.fml());
}
ctx = new_ctx.detach();
asserted_formulas &src_af = ctx->m_asserted_formulas;
asserted_formulas &dst_af = new_ctx->m_asserted_formulas;
src_af.get_macro_manager().copy_to(dst_af.get_macro_manager());
new_ctx->copy_user_propagator(*ctx, true);
ctx = new_ctx.detach();
ctx->setup_context(true);
ctx->internalize_assertions();
auto old_atoms = m_num_initial_atoms;
m_num_shared_units = ctx->assigned_literals().size();
m_num_initial_atoms = ctx->get_num_bool_vars();
LOG_WORKER(1, " inprocess " << old_atoms << " -> " << m_num_initial_atoms << "\n");
// TODO: copy user-propagators similar to context::copy.
}
void parallel::worker::collect_statistics(::statistics &st) const {
@ -395,7 +314,8 @@ namespace smt {
}
}
expr_ref_vector parallel::batch_manager::return_shared_clauses(ast_translation& g2l, unsigned& worker_limit, unsigned worker_id) {
expr_ref_vector parallel::batch_manager::return_shared_clauses(ast_translation &g2l, unsigned &worker_limit,
unsigned worker_id) {
std::scoped_lock lock(mux);
expr_ref_vector result(g2l.to());
for (unsigned i = worker_limit; i < shared_clause_trail.size(); ++i) {
@ -413,17 +333,16 @@ namespace smt {
lbool r = l_undef;
ctx->get_fparams().m_max_conflicts = std::min(m_config.m_threads_max_conflicts, m_config.m_max_conflicts);
IF_VERBOSE(1, verbose_stream() << " Checking cube\n" << bounded_pp_exprs(cube) << "with max_conflicts: " << ctx->get_fparams().m_max_conflicts << "\n";);
IF_VERBOSE(1, verbose_stream() << " Checking cube\n"
<< bounded_pp_exprs(cube)
<< "with max_conflicts: " << ctx->get_fparams().m_max_conflicts << "\n";);
try {
r = ctx->check(asms.size(), asms.data());
}
catch (z3_error& err) {
} catch (z3_error &err) {
b.set_exception(err.error_code());
}
catch (z3_exception& ex) {
} catch (z3_exception &ex) {
b.set_exception(ex.what());
}
catch (...) {
} catch (...) {
b.set_exception("unknown exception");
}
asms.shrink(asms.size() - cube.size());
@ -509,11 +428,13 @@ namespace smt {
if (m.limit().is_canceled())
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
case state::is_running: // batch manager is still running, but all threads have processed their cubes, which
// means all cubes were unsat
if (!m_search_tree.is_closed())
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
// 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
SASSERT(p.ctx.m_unsat_core.empty());
for (auto a : p.m_assumptions_used)
p.ctx.m_unsat_core.push_back(a);
@ -565,7 +486,6 @@ namespace smt {
return false;
}
void parallel::batch_manager::initialize() {
m_state = state::is_running;
m_search_tree.reset();
@ -593,7 +513,6 @@ namespace smt {
};
scoped_clear clear(*this);
{
m_batch_manager.initialize();
m_workers.reset();
for (auto e : asms)
@ -610,9 +529,7 @@ namespace smt {
// Launch threads
vector<std::thread> threads(num_threads);
for (unsigned i = 0; i < num_threads; ++i) {
threads[i] = std::thread([&, i]() {
m_workers[i]->run();
});
threads[i] = std::thread([&, i]() { m_workers[i]->run(); });
}
// Wait for all threads to finish
@ -622,10 +539,9 @@ namespace smt {
for (auto w : m_workers)
w->collect_statistics(ctx.m_aux_stats);
m_batch_manager.collect_statistics(ctx.m_aux_stats);
}
return m_batch_manager.get_result();
}
}
} // namespace smt
#endif

8
src/smt/smt_parallel.h
View file

@ -42,6 +42,7 @@ namespace smt {
};
class batch_manager {
enum state {
is_running,
is_sat,
@ -49,6 +50,7 @@ namespace smt {
is_exception_msg,
is_exception_code
};
struct stats {
unsigned m_max_cube_depth = 0;
unsigned m_num_cubes = 0;
@ -114,7 +116,7 @@ namespace smt {
bool m_share_units_initial_only = true;
bool m_cube_initial_only = true;
bool m_inprocessing = true;
unsigned m_inprocessing_delay = 0;
unsigned m_inprocessing_delay = 1;
unsigned m_max_cube_depth = 20;
};
@ -145,10 +147,6 @@ namespace smt {
m_config.m_threads_max_conflicts = (unsigned)(m_config.m_max_conflict_mul * m_config.m_threads_max_conflicts);
} // allow for backoff scheme of conflicts within the thread for cube timeouts.
bool get_cube(expr_ref_vector& cube, node*& n);
void backtrack(expr_ref_vector const& core, node* n);
void split(node* n, expr* atom);
void simplify();
public: