diff --git a/src/dbms_simulator.cpp b/src/dbms_simulator.cpp
index fd03b6f..92856cb 100644
--- a/src/dbms_simulator.cpp
+++ b/src/dbms_simulator.cpp
@@ -51,13 +51,29 @@ public:
         : mutex_()
         , params_(params)
         , servers_()
+        , clients_start_()
+        , clients_stop_()
     { }
+    ~dbms_simulator()
+    {
+    }
     void start();
     void stop();
     void donate_sst(dbms_server&,
                     const std::string& req, const wsrep_gtid_t& gtid, bool);
     const dbms_simulator_params& params() const
     { return params_; }
+    std::string stats() const
+    {
+        std::ostringstream os;
+        os << "Number of transactions: " <<
+            (params_.n_servers * params_.n_clients * params_.n_transactions)
+           << "\n"
+           << "Seconds: "
+           << std::chrono::duration<double>(clients_stop_ - clients_start_).count()
+           << "\n";
+        return os.str();
+    }
 private:
     std::string server_port(size_t i) const
     {
@@ -70,6 +86,8 @@ private:
     trrep::default_mutex mutex_;
     const dbms_simulator_params& params_;
     std::map<size_t, std::unique_ptr<dbms_server>> servers_;
+    std::chrono::time_point<std::chrono::steady_clock> clients_start_;
+        std::chrono::time_point<std::chrono::steady_clock> clients_stop_;
 };
 
 class dbms_client;
@@ -84,8 +102,10 @@ public:
         s_synced
     };
     dbms_server(dbms_simulator& simulator,
-                const std::string& name, const std::string& id)
-        : trrep::server_context(name, id, name + "_data",
+                const std::string& name,
+                const std::string& id,
+                const std::string& address)
+        : trrep::server_context(name, id, address, name + "_data",
                                 trrep::server_context::rm_async)
         , simulator_(simulator)
         , mutex_()
@@ -252,7 +272,7 @@ public:
     bool do_2pc() const { return false; }
     int apply(trrep::transaction_context&, const trrep::data&)
     {
-        std::cerr << "applying" << "\n";
+        // std::cerr << "applying" << "\n";
         return 0;
     }
     int commit(trrep::transaction_context& transaction_context)
@@ -261,12 +281,14 @@ public:
         ret = transaction_context.before_commit();
         ret = ret || transaction_context.ordered_commit();
         ret = ret || transaction_context.after_commit();
-        std::cerr << "commit" << "\n";
+        // std::cerr << "commit" << "\n";
         return 0;
     }
     int rollback(trrep::transaction_context& transaction_context)
     {
-        // std::cerr << "rollback: " << transaction_context.id().get() << "\n";
+        std::cerr << "rollback: " << transaction_context.id().get()
+                  << "state: " << trrep::to_string(transaction_context.state())
+                  << "\n";
         transaction_context.before_rollback();
         transaction_context.after_rollback();
         return 0;
@@ -288,22 +310,22 @@ private:
         int err(0);
         key.append_key_part(&trx_id, sizeof(trx_id));
         err = trx.append_key(key);
-        std::cout << "append_key: " << err << "\n";
+        // std::cout << "append_key: " << err << "\n";
         err = err || trx.append_data(trrep::data(os.str().c_str(), os.str().size()));
-        std::cout << "append_data: " << err << "\n";
+        // std::cout << "append_data: " << err << "\n";
         if (do_2pc())
         {
             err = err || trx.before_prepare();
-            std::cout << "before_prepare: " << err << "\n";
+            // std::cout << "before_prepare: " << err << "\n";
             err = err || trx.after_prepare();
-            std::cout << "after_prepare: " << err << "\n";
+            // std::cout << "after_prepare: " << err << "\n";
         }
         err = err || trx.before_commit();
-        std::cout << "before_commit: " << err << "\n";
+        // std::cout << "before_commit: " << err << "\n";
         err = err || trx.ordered_commit();
-        std::cout << "ordered_commit: " << err << "\n";
+        // std::cout << "ordered_commit: " << err << "\n";
         err = err || trx.after_commit();
-        std::cout << "after_commit: " << err << "\n";
+        // std::cout << "after_commit: " << err << "\n";
         trx.after_statement();
 
     }
@@ -378,9 +400,16 @@ void dbms_simulator::start()
         name_os << (i + 1);
         std::ostringstream id_os;
         id_os << (i + 1);
-        auto it(servers_.insert(std::make_pair((i + 1),
-                                               std::make_unique<dbms_server>(
-                                                   *this, name_os.str(), id_os.str()))));
+        std::ostringstream address_os;
+        address_os << "127.0.0.1:" << server_port(i);
+        auto it(servers_.insert(
+                    std::make_pair(
+                        (i + 1),
+                        std::make_unique<dbms_server>(
+                            *this,
+                            name_os.str(),
+                            id_os.str(),
+                            address_os.str()))));
         if (it.second == false)
         {
             throw trrep::runtime_error("Failed to add server");
@@ -390,10 +419,16 @@ void dbms_simulator::start()
 
         dbms_server& server(*it.first->second);
         std::string server_options(params_.wsrep_provider_options);
-        server_options += "; base_port=" + server_port(i);
-        server.load_provider(params_.wsrep_provider, server_options);
-        server.provider().connect("sim_cluster", cluster_address, "",
-                                  i == 0);
+        // server_options += "; base_port=" + server_port(i);
+        if (server.load_provider(params_.wsrep_provider, server_options))
+        {
+            throw trrep::runtime_error("Failed to load provider");
+        }
+        if (server.provider().connect("sim_cluster", cluster_address, "",
+                                      i == 0))
+        {
+            throw trrep::runtime_error("Failed to connect");
+        }
         server.start_applier();
         server.wait_until_connected();
         server.wait_until_state(dbms_server::s_synced);
@@ -401,6 +436,7 @@ void dbms_simulator::start()
 
     // Start client threads
 
+    clients_start_ = std::chrono::steady_clock::now();
     for (auto& i : servers_)
     {
         i.second->start_clients();
@@ -414,9 +450,23 @@ void dbms_simulator::stop()
     {
         dbms_server& server(*i.second);
         server.stop_clients();
+    }
+    clients_stop_ = std::chrono::steady_clock::now();
+    for (auto& i : servers_)
+    {
+        dbms_server& server(*i.second);
+        std::cout << "Status for server: " << server.id() << "\n";
+        auto status(server.provider().status());
+        for_each(status.begin(), status.end(),
+                 [](const trrep::provider::status_variable& sv)
+                 {
+                     std::cout << sv.name() << " = " << sv.value() << "\n";
+                 });
+
         server.provider().disconnect();
         server.wait_until_disconnected();
         server.stop_applier();
+
     }
 }
 
@@ -443,7 +493,8 @@ void dbms_simulator::donate_sst(dbms_server& server,
 }
 std::string dbms_simulator::build_cluster_address() const
 {
-    std::string ret("gcomm://");
+    std::string ret;
+    // std::string ret("gcomm://");
     for (size_t i(0); i < params_.n_servers; ++i)
     {
         std::ostringstream sa_os;
@@ -459,6 +510,7 @@ namespace po = boost::program_options;
 
 int main(int argc, char** argv)
 {
+    std::string stats;
     try
     {
         dbms_simulator_params params;
@@ -489,8 +541,8 @@ int main(int argc, char** argv)
 
         dbms_simulator sim(params);
         sim.start();
-        std::this_thread::sleep_for(std::chrono::seconds(5));
         sim.stop();
+        stats = sim.stats();
     }
     catch (const std::exception& e)
     {
@@ -498,5 +550,7 @@ int main(int argc, char** argv)
         return 1;
     }
 
+    std::cout << "Stats:\n" << stats << "\n";
+
     return 0;
 }
diff --git a/src/mock_provider.hpp b/src/mock_provider.hpp
index cc52067..982da81 100644
--- a/src/mock_provider.hpp
+++ b/src/mock_provider.hpp
@@ -96,9 +96,11 @@ namespace trrep
         int append_key(wsrep_ws_handle_t*, const wsrep_key_t*) { return 0; }
         int append_data(wsrep_ws_handle_t*, const wsrep_buf_t*) { return 0; }
         int rollback(const wsrep_trx_id_t) { return 0; }
-        wsrep_status_t commit_order_enter(wsrep_ws_handle_t*)
+        wsrep_status_t commit_order_enter(const wsrep_ws_handle_t*,
+                                          const wsrep_trx_meta_t*)
         { return WSREP_OK; }
-        int commit_order_leave(wsrep_ws_handle_t*) { return 0;}
+        int commit_order_leave(const wsrep_ws_handle_t*,
+                               const wsrep_trx_meta_t*) { return 0;}
         int release(wsrep_ws_handle_t*) { return 0; }
 
         // Methods to modify mock state
@@ -125,6 +127,11 @@ namespace trrep
 
         int sst_sent(const wsrep_gtid_t&, int) { return 0; }
         int sst_received(const wsrep_gtid_t&, int) { return 0; }
+
+        std::vector<status_variable> status() const
+        {
+            return std::vector<status_variable>();
+        }
     private:
         wsrep_uuid_t group_id_;
         wsrep_uuid_t node_id_;
diff --git a/src/mock_server_context.hpp b/src/mock_server_context.hpp
index d593cd3..d0a8173 100644
--- a/src/mock_server_context.hpp
+++ b/src/mock_server_context.hpp
@@ -18,7 +18,7 @@ namespace trrep
         mock_server_context(const std::string& name,
                             const std::string& id,
                             enum trrep::server_context::rollback_mode rollback_mode)
-            : trrep::server_context(name, id, "./", rollback_mode)
+            : trrep::server_context(name, id, "", "./", rollback_mode)
             , provider_()
             , last_client_id_(0)
         { }
diff --git a/src/provider.hpp b/src/provider.hpp
index 16c3cac..63eb1c8 100644
--- a/src/provider.hpp
+++ b/src/provider.hpp
@@ -10,6 +10,7 @@
 #include <wsrep_api.h>
 
 #include <string>
+#include <vector>
 
 namespace trrep
 {
@@ -18,6 +19,20 @@ namespace trrep
     {
     public:
 
+        class status_variable
+        {
+        public:
+            status_variable(const std::string& name,
+                            const std::string& value)
+                : name_(name)
+                , value_(value)
+            { }
+            const std::string& name() const { return name_; }
+            const std::string& value() const { return value_; }
+        private:
+            std::string name_;
+            std::string value_;
+        };
         virtual ~provider() { }
         // Provider state management
         virtual int connect(const std::string& cluster_name,
@@ -51,12 +66,16 @@ namespace trrep
                                         wsrep_trx_id_t victim_trx,
                                         wsrep_seqno_t* victim_seqno) = 0;
         virtual int rollback(const wsrep_trx_id_t) = 0;
-        virtual wsrep_status commit_order_enter(wsrep_ws_handle_t*) = 0;
-        virtual int commit_order_leave(wsrep_ws_handle_t*) = 0;
+        virtual wsrep_status commit_order_enter(const wsrep_ws_handle_t*,
+                                                const wsrep_trx_meta_t*) = 0;
+        virtual int commit_order_leave(const wsrep_ws_handle_t*,
+                                       const wsrep_trx_meta_t*) = 0;
         virtual int release(wsrep_ws_handle_t*) = 0;
 
         virtual int sst_sent(const wsrep_gtid_t&, int) = 0;
         virtual int sst_received(const wsrep_gtid_t&, int) = 0;
+
+        virtual std::vector<status_variable> status() const = 0;
         // Factory method
         static provider* make_provider(const std::string& provider);
     };
diff --git a/src/server_context.cpp b/src/server_context.cpp
index 504c08e..2a98608 100644
--- a/src/server_context.cpp
+++ b/src/server_context.cpp
@@ -37,7 +37,7 @@ namespace
         void* app_ctx,
         const wsrep_view_info_t* view __attribute((unused)))
     {
-        assert(app_ctx != 0);
+        assert(app_ctx);
         trrep::server_context& server_context(
             *reinterpret_cast<trrep::server_context*>(app_ctx));
         //
@@ -182,7 +182,7 @@ int trrep::server_context::load_provider(const std::string& provider_spec,
         memset(&init_args, 0, sizeof(init_args));
         init_args.app_ctx = this;
         init_args.node_name = name_.c_str();
-        init_args.node_address = "";
+        init_args.node_address = address_.c_str();
         init_args.node_incoming = "";
         init_args.data_dir = working_dir_.c_str();
         init_args.options = provider_options.c_str();
@@ -240,6 +240,7 @@ int trrep::server_context::on_apply(
         assert(0);
     }
 
+    transaction_context.after_statement();
     if (ret)
     {
         client_context.rollback(transaction_context);
diff --git a/src/server_context.hpp b/src/server_context.hpp
index 0e0f1ef..855063f 100644
--- a/src/server_context.hpp
+++ b/src/server_context.hpp
@@ -32,11 +32,13 @@ namespace trrep
 
         server_context(const std::string& name,
                        const std::string& id,
+                       const std::string& address,
                        const std::string& working_dir,
                        enum rollback_mode rollback_mode)
             : provider_()
             , name_(name)
             , id_(id)
+            , address_(address)
             , working_dir_(working_dir)
             , rollback_mode_(rollback_mode)
         { }
@@ -52,6 +54,11 @@ namespace trrep
         //
         const std::string& id() const { return id_; }
 
+        //
+        // Return server group communication address
+        //
+        const std::string& address() const { return address_; }
+
         //
         // Create client context which acts only locally, i.e. does
         // not participate in replication. However, local client
@@ -119,6 +126,7 @@ namespace trrep
         trrep::provider* provider_;
         std::string name_;
         std::string id_;
+        std::string address_;
         std::string working_dir_;
         enum rollback_mode rollback_mode_;
     };
diff --git a/src/transaction_context.cpp b/src/transaction_context.cpp
index 76ed5f3..8a26388 100644
--- a/src/transaction_context.cpp
+++ b/src/transaction_context.cpp
@@ -52,9 +52,16 @@ trrep::transaction_context::transaction_context(
 
 trrep::transaction_context::~transaction_context()
 {
-    if (state() != s_committed && state() != s_aborted)
+    if (active())
     {
-        client_context_.rollback(*this);
+        try
+        {
+            (void)client_context_.rollback(*this);
+        }
+        catch (...)
+        {
+            // TODO: Log warning
+        }
     }
 }
 
@@ -194,7 +201,7 @@ int trrep::transaction_context::before_commit()
     case trrep::client_context::m_local:
         if (ordered())
         {
-            ret = provider_.commit_order_enter(&ws_handle_);
+            ret = provider_.commit_order_enter(&ws_handle_, &trx_meta_);
         }
         break;
     case trrep::client_context::m_replicating:
@@ -222,7 +229,7 @@ int trrep::transaction_context::before_commit()
         if (ret == 0)
         {
             lock.unlock();
-            switch(provider_.commit_order_enter(&ws_handle_))
+            switch(provider_.commit_order_enter(&ws_handle_, &trx_meta_))
             {
             case WSREP_OK:
                 break;
@@ -240,7 +247,7 @@ int trrep::transaction_context::before_commit()
         break;
     case trrep::client_context::m_applier:
         assert(ordered());
-        ret = provider_.commit_order_enter(&ws_handle_);
+        ret = provider_.commit_order_enter(&ws_handle_, &trx_meta_);
         if (ret)
         {
             state(lock, s_must_abort);
@@ -268,7 +275,7 @@ int trrep::transaction_context::ordered_commit()
     debug_log_state();
     assert(state() == s_committing);
     assert(ordered());
-    ret = provider_.commit_order_leave(&ws_handle_);
+    ret = provider_.commit_order_leave(&ws_handle_, &trx_meta_);
     // Should always succeed
     assert(ret == 0);
     state(lock, s_ordered_commit);
@@ -427,8 +434,8 @@ int trrep::transaction_context::after_statement()
     {
         if (ordered())
         {
-            ret = provider_.commit_order_enter(&ws_handle_);
-            if (ret == 0) provider_.commit_order_leave(&ws_handle_);
+            ret = provider_.commit_order_enter(&ws_handle_, &trx_meta_);
+            if (ret == 0) provider_.commit_order_leave(&ws_handle_, &trx_meta_);
         }
         provider_.release(&ws_handle_);
     }
@@ -466,9 +473,9 @@ void trrep::transaction_context::state(
         };
     if (allowed[state_][next_state])
     {
-        std::cerr << "state transition: " << trrep::to_string(state_)
-                  << " -> " << trrep::to_string(next_state)
-                  << "\n";
+        // std::cerr << "state transition: " << trrep::to_string(state_)
+        //         << " -> " << trrep::to_string(next_state)
+        //         << "\n";
         state_hist_.push_back(state_);
         state_ = next_state;
     }
@@ -601,7 +608,7 @@ int trrep::transaction_context::certify_commit(
     assert(state() == s_certifying || state() == s_must_abort);
     client_context_.debug_sync("wsrep_after_replication");
 
-    std::cout << "seqno: " << trx_meta_.gtid.seqno << "\n";
+    // std::cout << "seqno: " << trx_meta_.gtid.seqno << "\n";
     int ret(1);
     switch (cert_ret)
     {
@@ -692,9 +699,9 @@ void trrep::transaction_context::clear_fragments()
 
 void trrep::transaction_context::cleanup()
 {
-    std::cerr << "Cleanup transaction "
-              << client_context_.id().get()
-              << ": " << id_.get() << "\n";
+    // std::cerr << "Cleanup transaction "
+    //        << client_context_.id().get()
+    //         << ": " << id_.get() << "\n";
     id_ = trrep::transaction_id::invalid();
     state_ = s_executing;
     state_hist_.clear();
@@ -708,7 +715,7 @@ void trrep::transaction_context::cleanup()
 
 void trrep::transaction_context::debug_log_state() const
 {
-    std::cout << "client: " << client_context_.id().get()
-              << " trx: " << id_.get()
-              << " state: " << state_ << "\n";
+    // std::cout << "client: " << client_context_.id().get()
+    //        << " trx: " << id_.get()
+    //         << " state: " << state_ << "\n";
 }
diff --git a/src/wsrep_provider_v26.cpp b/src/wsrep_provider_v26.cpp
index 764eec9..d7df699 100644
--- a/src/wsrep_provider_v26.cpp
+++ b/src/wsrep_provider_v26.cpp
@@ -7,7 +7,10 @@
 
 #include <wsrep_api.h>
 
+#include <cassert>
+
 #include <iostream>
+#include <sstream>
 
 trrep::wsrep_provider_v26::wsrep_provider_v26(
     const char* path,
@@ -91,14 +94,17 @@ wsrep_status_t trrep::wsrep_provider_v26::certify(wsrep_conn_id_t conn_id,
 }
 
 wsrep_status_t trrep::wsrep_provider_v26::commit_order_enter(
-    wsrep_ws_handle_t* wsh)
+    const wsrep_ws_handle_t* wsh,
+    const wsrep_trx_meta_t* meta)
 {
-    return wsrep_->commit_order_enter(wsrep_, wsh);
+    return wsrep_->commit_order_enter(wsrep_, wsh, meta);
 }
 
-int trrep::wsrep_provider_v26::commit_order_leave(wsrep_ws_handle_t* wsh)
+int trrep::wsrep_provider_v26::commit_order_leave(
+    const wsrep_ws_handle_t* wsh,
+    const wsrep_trx_meta_t* meta)
 {
-    return (wsrep_->commit_order_leave(wsrep_, wsh, 0) != WSREP_OK);
+    return (wsrep_->commit_order_leave(wsrep_, wsh, meta, 0) != WSREP_OK);
 }
 
 int trrep::wsrep_provider_v26::release(wsrep_ws_handle_t* wsh)
@@ -123,3 +129,43 @@ int trrep::wsrep_provider_v26::sst_received(const wsrep_gtid_t& gtid, int err)
     }
     return 0;
 }
+
+std::vector<trrep::provider::status_variable>
+trrep::wsrep_provider_v26::status() const
+{
+    std::vector<status_variable> ret;
+    struct wsrep_stats_var* const stats(wsrep_->stats_get(wsrep_));
+    struct wsrep_stats_var* i(stats);
+    if (i)
+    {
+        while (i->name)
+        {
+            switch (i->type)
+            {
+            case WSREP_VAR_STRING:
+                ret.push_back(status_variable(i->name, i->value._string));
+                break;
+            case WSREP_VAR_INT64:
+            {
+                std::ostringstream os;
+                os << i->value._int64;
+                ret.push_back(status_variable(i->name, os.str()));
+                break;
+            }
+            case WSREP_VAR_DOUBLE:
+            {
+                std::ostringstream os;
+                os << i->value._double;
+                ret.push_back(status_variable(i->name, os.str()));
+                break;
+            }
+            default:
+                assert(0);
+                break;
+            }
+            ++i;
+        }
+        wsrep_->stats_free(wsrep_, stats);
+    }
+    return ret;
+}
diff --git a/src/wsrep_provider_v26.hpp b/src/wsrep_provider_v26.hpp
index d4433a5..d33f451 100644
--- a/src/wsrep_provider_v26.hpp
+++ b/src/wsrep_provider_v26.hpp
@@ -33,11 +33,15 @@ namespace trrep
                                 wsrep_trx_id_t,
                                 wsrep_seqno_t*) { return WSREP_OK; }
         int rollback(const wsrep_trx_id_t) { return 0; }
-        wsrep_status commit_order_enter(wsrep_ws_handle_t*);
-        int commit_order_leave(wsrep_ws_handle_t*);
+        wsrep_status commit_order_enter(const wsrep_ws_handle_t*,
+                                        const wsrep_trx_meta_t*);
+        int commit_order_leave(const wsrep_ws_handle_t*,
+                               const wsrep_trx_meta_t*);
         int release(wsrep_ws_handle_t*);
         int sst_sent(const wsrep_gtid_t&,int);
         int sst_received(const wsrep_gtid_t& gtid, int);
+
+        std::vector<status_variable> status() const;
     private:
         wsrep_provider_v26(const wsrep_provider_v26&);
         wsrep_provider_v26& operator=(const wsrep_provider_v26);