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9ec1e527a3
The `SHAMapItem` class contains a variable-sized buffer that holds the serialized data associated with a particular item inside a `SHAMap`. Prior to this commit, the buffer for the serialized data was allocated separately. Coupled with the fact that most instances of `SHAMapItem` were wrapped around a `std::shared_ptr` meant that an instantiation might result in up to three separate memory allocations. This commit switches away from `std::shared_ptr` for `SHAMapItem` and uses `boost::intrusive_ptr` instead, allowing the reference count for an instance to live inside the instance itself. Coupled with using a slab-based allocator to optimize memory allocation for the most commonly sized buffers, the net result is significant memory savings. In testing, the reduction in memory usage hovers between 400MB and 650MB. Other scenarios might result in larger savings. In performance testing with NFTs, this commit reduces memory size by about 15% sustained over long duration. Commit 2 of 3 in #4218.
100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef RIPPLE_APP_LEDGER_TRANSACTIONMASTER_H_INCLUDED
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#define RIPPLE_APP_LEDGER_TRANSACTIONMASTER_H_INCLUDED
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#include <ripple/app/misc/Transaction.h>
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#include <ripple/basics/RangeSet.h>
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#include <ripple/protocol/ErrorCodes.h>
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#include <ripple/shamap/SHAMapItem.h>
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#include <ripple/shamap/SHAMapTreeNode.h>
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namespace ripple {
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class Application;
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class STTx;
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// Tracks all transactions in memory
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class TransactionMaster
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{
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public:
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TransactionMaster(Application& app);
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TransactionMaster(TransactionMaster const&) = delete;
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TransactionMaster&
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operator=(TransactionMaster const&) = delete;
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std::shared_ptr<Transaction>
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fetch_from_cache(uint256 const&);
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std::variant<
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std::pair<std::shared_ptr<Transaction>, std::shared_ptr<TxMeta>>,
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TxSearched>
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fetch(uint256 const&, error_code_i& ec);
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/**
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* Fetch transaction from the cache or database.
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*
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* @return A std::variant that contains either a
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* pair of shared_pointer to the retrieved transaction
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* and its metadata or an enum indicating whether or not
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* the all ledgers in the provided range were present in
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* the database while the search was conducted.
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*/
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std::variant<
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std::pair<std::shared_ptr<Transaction>, std::shared_ptr<TxMeta>>,
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TxSearched>
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fetch(
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uint256 const&,
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ClosedInterval<uint32_t> const& range,
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error_code_i& ec);
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std::shared_ptr<STTx const>
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fetch(
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boost::intrusive_ptr<SHAMapItem> const& item,
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SHAMapNodeType type,
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std::uint32_t uCommitLedger);
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// return value: true = we had the transaction already
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bool
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inLedger(
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uint256 const& hash,
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std::uint32_t ledger,
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std::optional<uint32_t> tseq,
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std::optional<uint16_t> netID);
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void
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canonicalize(std::shared_ptr<Transaction>* pTransaction);
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void
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sweep(void);
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TaggedCache<uint256, Transaction>&
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getCache();
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private:
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Application& mApp;
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TaggedCache<uint256, Transaction> mCache;
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};
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} // namespace ripple
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#endif
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