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blockchain: incremental long term block weight cache

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moneromooo-monero 2019-03-26 12:15:08 +00:00
parent 9b687c7873
commit ae6885f6b4
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GPG Key ID: 686F07454D6CEFC3
1 changed files with 22 additions and 0 deletions
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22
src/cryptonote_core/blockchain.cpp
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@ -1280,6 +1280,8 @@ void Blockchain::get_long_term_block_weights(std::vector<uint64_t>& weights, uin
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
PERF_TIMER(get_long_term_block_weights);
if (count == 0)
return;
@ -1295,10 +1297,30 @@ void Blockchain::get_long_term_block_weights(std::vector<uint64_t>& weights, uin
if (cached)
{
MTRACE("requesting " << count << " from " << start_height << ", cached");
weights = m_long_term_block_weights_cache;
return;
}
// in the vast majority of uncached cases, most is still cached,
// as we just move the window one block up:
if (tip_height > 0 && count == m_long_term_block_weights_cache.size() && tip_height < blockchain_height)
{
crypto::hash old_tip_hash = m_db->get_block_hash_from_height(tip_height - 1);
if (old_tip_hash == m_long_term_block_weights_cache_tip_hash)
{
weights = m_long_term_block_weights_cache;
for (size_t i = 1; i < weights.size(); ++i)
weights[i - 1] = weights[i];
MTRACE("requesting " << count << " from " << start_height << ", incremental");
weights.back() = m_db->get_block_long_term_weight(tip_height);
m_long_term_block_weights_cache = weights;
m_long_term_block_weights_cache_tip_hash = tip_hash;
return;
}
}
MTRACE("requesting " << count << " from " << start_height << ", uncached");
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;