refactor: [Memory optimization] Eliminate padding between block index fields #1962
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Removes 16 bytes of padding from each CBlockIndex object for 64-bit platforms.
This forces LevelDB to release the pages for all the memory-mapped files read to load the block index on Linux. Although it's mostly cosmetic, it may prevent the OOM killer from eyeing the process in memory-constrained environments after the node starts.
jamescowens
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Nov 9, 2020
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Added - gui: Add RAC column to wizard summary page projects table #1951 (@cyrossignol) - rpc: clean up the superblocks function and add magnitude to getmininginfo #1966 (@jamescowens) - rpc: Add transaction size to RPC output #1971 (@cyrossignol) - voting: Add user-facing support for poll response types #1976 (@cyrossignol) - gui: Port Bitcoin Intro class (implement the ability to choose a data directory via the GUI) #1978 (@jamescowens) - gui: Port Bitcoin MacOS app nap manager #1991 (@jamescowens) - mining, rpc: Implement staking efficiency measure and improve SelectCoinsForStaking and CreateCoinStake #1992 (@jamescowens) - accrual, rpc: Implement auditsnapshotaccruals #2001 (@jamescowens) - docs: add doxygen support #2000 (@div72) - beacon: Specialized beacon storage in leveldb #2009 (@jamescowens) - rpc: Add a call to dump contracts in binary form #2011 (@div72) - rpc: Add boolean option to report active beacons only in beaconreport #2013 (@jamescowens) - consensus: Set Hilda mainnet hardfork height to 2197000 #2022 (@jamescowens) Changed - refactor: [Memory optimization] Block index duplicate PoS state #1945 (@cyrossignol) - refactor: [Memory optimization] Block index superblock and contract flags #1950 (@cyrossignol) - refactor: [Memory optimization] Remove stake modifier checksums #1954 (@cyrossignol) - refactor: [Memory optimization] Block index allocation overhead #1957 (@cyrossignol) - refactor: [Memory optimization] Remove block index subsidy fields #1960 (@cyrossignol) - refactor: [Memory optimization] Separate chain trust from the block index #1961 (@cyrossignol) - refactor: [Memory optimization] Eliminate padding between block index fields #1962 (@cyrossignol) - beacon, gui: Add check for presence of beacon private key to updateBeacon() #1968 (@jamescowens) - util: Enhance ETTS calculation #1973 (@jamescowens) - refactor: Use new clamp in util.h #1975 (@jamescowens) - gui: Redo global status for overview #1983 (@jamescowens) - util: Improvements to MilliTimer class and use in the miner and init #1987 (@jamescowens) - rpc: Move rpc files to directory #1995 (@Pythonix) - rpc: Enhance consolidateunspent and fix fee calculation #1994 (@jamescowens) - contract: Double the lookback scope of contract replay #1998 (@jamescowens) - net: Don't rely on external IP resolvers #2002 (@Tetrix42) - beacon: Change beacon map to pointers #2008 (@jamescowens) - gui: Update bitcoin_sv.ts #2014 (@sweede-se) - util: Update snapshot URLs and add accrual directory #2019 (@jamescowens) - beacon: Tweak BeaconRegistry::Revert #2020 (@jamescowens) - rpc, qt: bump fees @2023 (@div72) Removed - researcher: Remove automatic legacy beacon key import #1963 (@cyrossignol) - util: Revert "Close LevelDB after loading the block index" #1969 (@cyrossignol) - ci: Fix python symlink issue & remove travis #1990 (@div72) - ci: remove python workaround #2005 (@div72) Fixed - gui: fix mandatory/leisure detection of upgrade check #1959 (@Pythonix) - voting: Fix title in "gettransaction" RPC for legacy poll contracts @1970 (@cyrossignol) - gui: Fix missing menu items on macOS #1972 (@scribblemaniac) - rpc: Fix answer offset in "votedetails" #1974 (@cyrossignol) - voting: Implement missing try-catch in VotingVoteDialog::vote #1980 (@jamescowens) - scraper: Add check for minimum housekeeping complete in scraper #1977 (@jamescowens) - voting: Fix nonsense vote weights for legacy polls #1988 (@cyrossignol) - voting: Fix incorrect field returned in ResolveMoneySupplyForPoll() #1989 (@cyrossignol) - consensus, accrual: Fix newbie accrual #2004 (@jamescowens) - log: grammar correction #2016 (@nathanielcwm) - wallet: Correct nMinFee fee calculation in CreateTransaction #2021 (@jamescowens) - rpc, miner: Correct GetLastStake #2026 (@jamescowens) - wallet: Fix bug in CreateTransaction causing insufficient fees #2029 (@jamescowens)
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This is part of a series of changes that optimize the memory usage of Gridcoin's block index. According to Valgrind's heap profiler (Massif), these changes will decrease memory usage of the application by over 500 MB after the final PR merges. Because these optimizations apply to every block, memory savings will continue to accrue as the chain grows. I'm breaking-up the commits into separate PRs because the branch has become too unwieldy to review in one submission.
This reorders member fields of
CBlockIndexto avoid extra padding added by the compiler. It saves 16 bytes per block on 64-bit platforms.I also include a small tweak that closes LevelDB after loading the block index to free some of the memory used to map the database files on launch. This may help to prevent the OS from killing a node during start-up when memory is tight (I encountered this when running Gridcoin on my phone).