fees: skip pointless fee parameter calculation during IBD#22919
fees: skip pointless fee parameter calculation during IBD#22919rjnrohit wants to merge 1 commit intobitcoin:masterfrom
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Can you explain this a bit better? During IBD the mempool should be empty, so the |
Regardless of size of |
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See also: |
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Bitcoin nodes update their TxConfirmStats attributes (eg. confAvg, failAvg etc..) whenever they see a new block. However, during IBD, we know our best block height, so we can skip the parameter updates up to a certain height, when we know they are not going to affect fee estimates. We can see the max value of decay for parameters is .99931. If we do (max_decay)^6048 which is approximate 0.01, it means, that transactions in blocks older than this height, do not affect the current fee estimates significantly. (i.e ~ Best_Block_Height - 6048). By skipping these updates we can reduce the computation complexity of fee calculation during IBD significantly: (block_tree_size - 6048)/block_tree_size*100 which is ~ 99%.
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🐙 This pull request conflicts with the target branch and needs rebase. Want to unsubscribe from rebase notifications on this pull request? Just convert this pull request to a "draft". |
There hasn't been much activity lately and the patch still needs rebase. What is the status here?
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Closing for now. |
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Bitcoin nodes update their TxConfirmStats attributes (eg.
confAvg, failAvgetc..) whenever they see a new block. However, during IBD, we know our best block height, so we can skip the parameter updates up to a certain height, when we know they are not going to affect fee estimates.We can see the max value of decay for parameters is .99931. If we do (max_decay)^6048 which is approximate 0.01, it means, that transactions in blocks older than this height, do not affect the current fee estimates significantly. (i.e ~ Best_Block_Height - 6048).
By skipping these updates we can reduce the computation complexity of fee calculation during IBD significantly: (block_tree_size - 6048)/block_tree_size*100 which is ~ 99%.
I got to know about the functions to optimize by analyzing the profiling data of
bitcoind. It can be generated via./configure CC=clang CXX=clang++ CXXFLAGS="-fprofile-instr-generate=bitcoind-%p.profraw