BlockchainLMDB: Add profiling to tx_exists()

src/cryptonote_core/BlockchainDB_impl/db_lmdb.cpp

@@ -1126,7 +1126,6 @@ uint64_t BlockchainLMDB::height() const
   return m_height;
 }
 
-
 bool BlockchainLMDB::tx_exists(const crypto::hash& h) const
 {
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);
@@ -1144,7 +1143,11 @@ bool BlockchainLMDB::tx_exists(const crypto::hash& h) const
 
   MDB_val_copy<crypto::hash> key(h);
   MDB_val result;
+
+  TIME_MEASURE_START(time1);
   auto get_result = mdb_get(*txn_ptr, m_txs, &key, &result);
+  TIME_MEASURE_FINISH(time1);
+  time_tx_exists += time1;
   if (get_result == MDB_NOTFOUND)
   {
     if (! m_batch_active)

src/cryptonote_core/blockchain_db.cpp

@@ -149,6 +149,7 @@ void BlockchainDB::reset_stats()
 {
   num_calls = 0;
   time_blk_hash = 0;
+  time_tx_exists = 0;
   time_add_block1 = 0;
   time_add_transaction = 0;
   time_commit1 = 0;
@@ -163,6 +164,8 @@ void BlockchainDB::show_stats()
     << ENDL
     << "time_blk_hash: " << time_blk_hash << "ms"
     << ENDL
+    << "time_tx_exists: " << time_tx_exists << "ms"
+    << ENDL
     << "time_add_block1: " << time_add_block1 << "ms"
     << ENDL
     << "time_add_transaction: " << time_add_transaction << "ms"

src/cryptonote_core/blockchain_db.h

@@ -310,6 +310,7 @@ private:
 
 protected:
 
+  mutable uint64_t time_tx_exists = 0;
   uint64_t time_commit1 = 0;