5aa0c82ccd
9f947fc3d4b779f017332135323b34e8f216f613 Use PoolAllocator for CCoinsMap (Martin Leitner-Ankerl) 5e4ac5abf54f8e6d6330df0c73119aa0cca4c103 Call ReallocateCache() on each Flush() (Martin Leitner-Ankerl) 1afca6b663bb54022afff193fd9d83856606b189 Add PoolResource fuzzer (Martin Leitner-Ankerl) e19943f049ed8aa4f32a1d8440a9fbf160367f0f Calculate memory usage correctly for unordered_maps that use PoolAllocator (Martin Leitner-Ankerl) b8401c3281978beed6198b2f9782b6a8dd35cbd7 Add pool based memory resource & allocator (Martin Leitner-Ankerl) Pull request description: A memory resource similar to `std::pmr::unsynchronized_pool_resource`, but optimized for node-based containers. The goal is to be able to cache more coins with the same memory usage, and allocate/deallocate faster. This is a reimplementation of #22702. The goal was to implement it in a way that is simpler to review & test * There is now a generic `PoolResource` for allocating/deallocating memory. This has practically the same API as `std::pmr::memory_resource`. (Unfortunately I cannot use std::pmr because libc++ simply doesn't implement that API). * Thanks to sipa there is now a fuzzer for PoolResource! On a fast machine I ran it for ~770 million executions without finding any issue. * The estimation of the correct node size is now gone, PoolResource now has multiple pools and just needs to be created large enough to have space for the unordered_map nodes. I ran benchmarks with #22702, mergebase, and this PR. Frequency locked Intel i7-8700, clang++ 13.0.1 to reindex up to block 690000. ```sh bitcoind -dbcache=5000 -assumevalid=00000000000000000002a23d6df20eecec15b21d32c75833cce28f113de888b7 -reindex-chainstate -printtoconsole=0 -stopatheight=690000 ``` The performance is practically identical with #22702, just 0.4% slower. It's ~21% faster than master:   Note that on cache drops mergebase's memory doesnt go so far down because it does not free the `CCoinsMap` bucket array.  ACKs for top commit: LarryRuane: ACK 9f947fc3d4b779f017332135323b34e8f216f613 achow101: re-ACK 9f947fc3d4b779f017332135323b34e8f216f613 john-moffett: ACK 9f947fc3d4b779f017332135323b34e8f216f613 jonatack: re-ACK 9f947fc3d4b779f017332135323b34e8f216f613 Tree-SHA512: 48caf57d1775875a612b54388ef64c53952cd48741cacfe20d89049f2fb35301b5c28e69264b7d659a3ca33d4c714d47bafad6fd547c4075f08b45acc87c0f45
Bitcoin Core integration/staging tree
For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.
What is Bitcoin Core?
Bitcoin Core connects to the Bitcoin peer-to-peer network to download and fully validate blocks and transactions. It also includes a wallet and graphical user interface, which can be optionally built.
Further information about Bitcoin Core is available in the doc folder.
License
Bitcoin Core is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/MIT.
Development Process
The master branch is regularly built (see doc/build-*.md for instructions) and tested, but it is not guaranteed to be
completely stable. Tags are created
regularly from release branches to indicate new official, stable release versions of Bitcoin Core.
The https://github.com/bitcoin-core/gui repository is used exclusively for the development of the GUI. Its master branch is identical in all monotree repositories. Release branches and tags do not exist, so please do not fork that repository unless it is for development reasons.
The contribution workflow is described in CONTRIBUTING.md and useful hints for developers can be found in doc/developer-notes.md.
Testing
Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money.
Automated Testing
Developers are strongly encouraged to write unit tests for new code, and to
submit new unit tests for old code. Unit tests can be compiled and run
(assuming they weren't disabled in configure) with: make check. Further details on running
and extending unit tests can be found in /src/test/README.md.
There are also regression and integration tests, written
in Python.
These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py
The CI (Continuous Integration) systems make sure that every pull request is built for Windows, Linux, and macOS, and that unit/sanity tests are run automatically.
Manual Quality Assurance (QA) Testing
Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.
Translations
Changes to translations as well as new translations can be submitted to Bitcoin Core's Transifex page.
Translations are periodically pulled from Transifex and merged into the git repository. See the translation process for details on how this works.
Important: We do not accept translation changes as GitHub pull requests because the next pull from Transifex would automatically overwrite them again.