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speedup get_output_histogram for all amounts when min_count > 0

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This skips the vast majority of "dust" output amounts with just
one instance on the chain. Clocks in at 0.15% of the original
time on testnet.
This commit is contained in:
moneromooo-monero 2018-03-22 17:51:58 +00:00
parent 2dae0f203a
commit ffeeefde60
No known key found for this signature in database
GPG Key ID: 686F07454D6CEFC3
6 changed files with 16 additions and 10 deletions
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3
src/blockchain_db/blockchain_db.h
View File

@ -1490,10 +1490,11 @@ public:
* @param amounts optional set of amounts to lookup
* @param unlocked whether to restrict count to unlocked outputs
* @param recent_cutoff timestamp to determine whether an output is recent
* @param min_count return only amounts with at least that many instances
*
* @return a set of amount/instances
*/
virtual std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff) const = 0;
virtual std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff, uint64_t min_count) const = 0;
/**
* @brief is BlockchainDB in read-only mode?

5
src/blockchain_db/lmdb/db_lmdb.cpp
View File

@ -3086,7 +3086,7 @@ void BlockchainLMDB::get_output_tx_and_index(const uint64_t& amount, const std::
LOG_PRINT_L3("db3: " << db3);
}
std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> BlockchainLMDB::get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff) const
std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> BlockchainLMDB::get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff, uint64_t min_count) const
{
LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open();
@ -3112,6 +3112,7 @@ std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> BlockchainLMDB::get
mdb_size_t num_elems = 0;
mdb_cursor_count(m_cur_output_amounts, &num_elems);
uint64_t amount = *(const uint64_t*)k.mv_data;
if (num_elems >= min_count)
histogram[amount] = std::make_tuple(num_elems, 0, 0);
}
}
@ -3123,12 +3124,14 @@ std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> BlockchainLMDB::get
int ret = mdb_cursor_get(m_cur_output_amounts, &k, &v, MDB_SET);
if (ret == MDB_NOTFOUND)
{
if (0 >= min_count)
histogram[amount] = std::make_tuple(0, 0, 0);
}
else if (ret == MDB_SUCCESS)
{
mdb_size_t num_elems = 0;
mdb_cursor_count(m_cur_output_amounts, &num_elems);
if (num_elems >= min_count)
histogram[amount] = std::make_tuple(num_elems, 0, 0);
}
else

3
src/blockchain_db/lmdb/db_lmdb.h
View File

@ -287,10 +287,11 @@ public:
* @param amounts optional set of amounts to lookup
* @param unlocked whether to restrict count to unlocked outputs
* @param recent_cutoff timestamp to determine which outputs are recent
* @param min_count return only amounts with at least that many instances
*
* @return a set of amount/instances
*/
std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff) const;
std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff, uint64_t min_count) const;
private:
void do_resize(uint64_t size_increase=0);

4
src/cryptonote_core/blockchain.cpp
View File

@ -4322,9 +4322,9 @@ uint64_t Blockchain::get_difficulty_target() const
return get_current_hard_fork_version() < 2 ? DIFFICULTY_TARGET_V1 : DIFFICULTY_TARGET_V2;
}
std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> Blockchain:: get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff) const
std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> Blockchain:: get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff, uint64_t min_count) const
{
return m_db->get_output_histogram(amounts, unlocked, recent_cutoff);
return m_db->get_output_histogram(amounts, unlocked, recent_cutoff, min_count);
}
std::list<std::pair<Blockchain::block_extended_info,uint64_t>> Blockchain::get_alternative_chains() const

3
src/cryptonote_core/blockchain.h
View File

@ -827,10 +827,11 @@ namespace cryptonote
* @param amounts optional set of amounts to lookup
* @param unlocked whether to restrict instances to unlocked ones
* @param recent_cutoff timestamp to consider outputs as recent
* @param min_count return only amounts with at least that many instances
*
* @return a set of amount/instances
*/
std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff) const;
std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff, uint64_t min_count = 0) const;
/**
* @brief perform a check on all key images in the blockchain

2
src/rpc/core_rpc_server.cpp
View File

@ -1728,7 +1728,7 @@ namespace cryptonote
std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> histogram;
try
{
histogram = m_core.get_blockchain_storage().get_output_histogram(req.amounts, req.unlocked, req.recent_cutoff);
histogram = m_core.get_blockchain_storage().get_output_histogram(req.amounts, req.unlocked, req.recent_cutoff, req.min_count);
}
catch (const std::exception &e)
{