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Parallel tactic (#9824) (#9825)

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Add new parallel algorithm as a tactic (parallel_tactical2.cpp)
Don't port over old experiments from smt_parallel that we aren't using
(sls, inprocessing, failed_literal_mode for bb detection)
Fix bugs: lease cancellation/reslimit race condition, involves changing
lease epoch to simple boolean flag
Also, now there is a single shared set of params for the tactic and
smt_parallel

**Test runs for the parallel_tactical2 vs old smt_parallel version:**
run-2747-Z3-threads-4-qflia-30s-stats.md
run-2746-Z3-threads-4-qflia-30s-parallel_tactic-stats.md
run-2745-Z3-threads-1-qfbv-30s-stats.md
run-3013-Z3-threads-4-qfbv-30s-parallel_tactic-stats.md --> note this is
indeed run-3013, I reran after a bugfix in inc_sat_solver
run-2743-Z3-threads-4-qfnia-30s-stats.md
run-2742-Z3-threads-4-qfnia-30s-parallel_tactic-stats.md

**Test runs for the new smt_parallel with bugfixes:**
run-2801-Z3-threads-4-qflia-30s-smtparallel-bugfixes-stats.md,
run-2800-Z3-threads-4-qflia-30s-smtparallel-bugfixes-stats.md
run-2797-Z3-threads-4-qfnia-30s-smtparallel-bugfixes-stats.md
compare to old smt_parallel:
run-2747-Z3-threads-4-qflia-30s-stats.md
run-2743-Z3-threads-4-qfnia-30s-stats.md

Note that there is a slight regression on lia in run-2800. The source of
this appears to be the new new LP largest-cube LIA heuristic param,
which is enabled by default. disabling this param in run-2801 restored
performance (I didn't change this in this PR though, just something to
note)

http://mtzguido.tplinkdns.com:8081/z3/compare_stats.html

---------

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
Co-authored-by: Ilana Shapiro <ilanashapiro@Ilanas-MacBook-Pro.local>
Co-authored-by: Ilana Shapiro <ilanashapiro@Ilanas-MBP.localdomain>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
This commit is contained in:
Nikolaj Bjorner 2026-06-26 09:36:15 -07:00 • committed by GitHub
parent 15f33f458d
commit 612fab1c9a
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29 changed files with 2694 additions and 1796 deletions
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11
src/smt/smt_context.cpp
View file

@ -118,6 +118,10 @@ namespace smt {
if (!m_setup.already_configured()) {
m_fparams.updt_params(p);
}
else {
// selected parameters are safe to update after initialization
m_fparams.m_max_conflicts = p.get_uint("max_conflicts", m_fparams.m_max_conflicts);
}
for (auto th : m_theory_set)
if (th)
th->updt_params();
@ -3652,6 +3656,13 @@ namespace smt {
}
}
void context::setup_for_parallel() {
// Native SMT parallel configures the parent context before cloning workers.
// context::copy then configures/internalizes each worker copy while
// preprocessing is still enabled.
setup_context(m_fparams.m_auto_config);
}
config_mode context::get_config_mode(bool use_static_features) const {
if (!m_fparams.m_auto_config)
return CFG_BASIC;