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set random seed directly on m_smt_params before context initialization

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updates to random seed on ctx does not get propagated to arithmetic solver, preventing diversity within arithmetic solver.
This commit is contained in:
Nikolaj Bjorner 2026-02-09 14:44:00 -08:00
parent 30f5500b1e
commit 73844f9a7f
1 changed files with 5 additions and 3 deletions
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6
src/smt/smt_parallel.cpp
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@ -75,7 +75,8 @@ namespace smt {
if (!m.inc()) if (!m.inc())
return; return;
res = m_sls->check(); res = m_sls->check();
} catch (z3_exception& ex) { }
catch (z3_exception& ex) {
// Cancellation is normal in portfolio mode // Cancellation is normal in portfolio mode
if (m.limit().is_canceled()) { if (m.limit().is_canceled()) {
IF_VERBOSE(1, verbose_stream() << "SLS worker canceled\n"); IF_VERBOSE(1, verbose_stream() << "SLS worker canceled\n");
@ -94,6 +95,7 @@ namespace smt {
} }
if (res == l_true) { if (res == l_true) {
IF_VERBOSE(2, verbose_stream() << "SLS worker found SAT\n");
model_ref mdl = m_sls->get_model(); model_ref mdl = m_sls->get_model();
b.set_sat(m_l2g, *mdl); b.set_sat(m_l2g, *mdl);
} }
@ -181,10 +183,10 @@ namespace smt {
for (auto e : _asms) for (auto e : _asms)
asms.push_back(m_g2l(e)); asms.push_back(m_g2l(e));
LOG_WORKER(1, " created with " << asms.size() << " assumptions\n"); LOG_WORKER(1, " created with " << asms.size() << " assumptions\n");
m_smt_params.m_random_seed += id; // ensure different random seed for each worker
ctx = alloc(context, m, m_smt_params, p.ctx.get_params()); ctx = alloc(context, m, m_smt_params, p.ctx.get_params());
ctx->set_logic(p.ctx.m_setup.get_logic()); ctx->set_logic(p.ctx.m_setup.get_logic());
context::copy(p.ctx, *ctx, true); context::copy(p.ctx, *ctx, true);
ctx->set_random_seed(id + m_smt_params.m_random_seed);
// don't share initial units // don't share initial units
ctx->pop_to_base_lvl(); ctx->pop_to_base_lvl();
m_num_shared_units = ctx->assigned_literals().size(); m_num_shared_units = ctx->assigned_literals().size();