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blockchain: simple cache for the long term block weights

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moneromooo-monero 2019-03-26 11:51:13 +00:00
parent e4b049da05
commit 9b687c7873
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GPG Key ID: 686F07454D6CEFC3
3 changed files with 29 additions and 0 deletions
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22
src/cryptonote_core/blockchain.cpp
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@ -178,6 +178,7 @@ Blockchain::Blockchain(tx_memory_pool& tx_pool) :
m_enforce_dns_checkpoints(false), m_max_prepare_blocks_threads(4), m_db_sync_on_blocks(true), m_db_sync_threshold(1), m_db_sync_mode(db_async), m_db_default_sync(false), m_fast_sync(true), m_show_time_stats(false), m_sync_counter(0), m_bytes_to_sync(0), m_cancel(false),
m_long_term_block_weights_window(CRYPTONOTE_LONG_TERM_BLOCK_WEIGHT_WINDOW_SIZE),
m_long_term_effective_median_block_weight(0),
m_long_term_block_weights_cache_tip_hash(crypto::null_hash),
m_difficulty_for_next_block_top_hash(crypto::null_hash),
m_difficulty_for_next_block(1),
m_btc_valid(false)
@ -1279,7 +1280,28 @@ void Blockchain::get_long_term_block_weights(std::vector<uint64_t>& weights, uin
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
if (count == 0)
return;
bool cached = false;
uint64_t blockchain_height = m_db->height();
uint64_t tip_height = start_height + count - 1;
crypto::hash tip_hash = crypto::null_hash;
if (tip_height < blockchain_height && count == m_long_term_block_weights_cache.size())
{
tip_hash = m_db->get_block_hash_from_height(tip_height);
cached = tip_hash == m_long_term_block_weights_cache_tip_hash;
}
if (cached)
{
weights = m_long_term_block_weights_cache;
return;
}
weights = m_db->get_long_term_block_weights(start_height, count);
m_long_term_block_weights_cache = weights;
m_long_term_block_weights_cache_tip_hash = tip_hash;
}
//------------------------------------------------------------------
uint64_t Blockchain::get_current_cumulative_block_weight_limit() const

2
src/cryptonote_core/blockchain.h
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@ -1060,6 +1060,8 @@ namespace cryptonote
uint64_t m_timestamps_and_difficulties_height;
uint64_t m_long_term_block_weights_window;
uint64_t m_long_term_effective_median_block_weight;
mutable crypto::hash m_long_term_block_weights_cache_tip_hash;
mutable std::vector<uint64_t> m_long_term_block_weights_cache;
epee::critical_section m_difficulty_lock;
crypto::hash m_difficulty_for_next_block_top_hash;

5
tests/block_weight/block_weight.cpp
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@ -84,6 +84,11 @@ public:
while (count-- && start_height < blocks.size()) ret.push_back(blocks[start_height++].long_term_weight);
return ret;
}
virtual crypto::hash get_block_hash_from_height(const uint64_t &height) const override {
crypto::hash hash = crypto::null_hash;
*(uint64_t*)&hash = height;
return hash;
}
virtual crypto::hash top_block_hash(uint64_t *block_height = NULL) const override {
uint64_t h = height();
crypto::hash top = crypto::null_hash;