mirror of
https://github.com/matrix-construct/construct
synced 2024-07-01 00:08:22 +02:00
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
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//
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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 is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_DB_PREFETCHER_H
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namespace ircd::db
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{
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struct prefetcher extern *prefetcher;
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}
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struct ircd::db::prefetcher
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{
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struct ticker;
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struct request;
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using closure = std::function<bool (request &)>;
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std::deque<request> queue;
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std::unique_ptr<ticker> ticker;
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ctx::dock work, fini;
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ctx::context context;
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size_t request_workers {0};
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private:
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void request_handle(request &);
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size_t request_cleanup() noexcept;
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void request_worker();
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void handle();
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void worker();
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public:
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size_t wait_pending();
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size_t cancel(const closure &);
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size_t cancel(database &); // Cancel all for db
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size_t cancel(column &); // Cancel all for column
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bool operator()(column &, const string_view &key, const gopts &);
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prefetcher();
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~prefetcher() noexcept;
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};
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struct ircd::db::prefetcher::request
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{
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using key_buf = char[208];
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database *d {nullptr}; // database instance
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uint32_t cid {0}; // column ID
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uint32_t len {0}; // length of key
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steady_point snd; // submitted by user
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steady_point req; // request sent to database
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steady_point fin; // result from database
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key_buf key alignas(16); // key buffer
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explicit operator string_view() const noexcept;
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request(database &d, const column &c, const string_view &key) noexcept;
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request() = default;
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};
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static_assert
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(
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sizeof(ircd::db::prefetcher::request) == 256,
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"struct ircd::db::prefetcher::request fell out of alignment"
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);
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struct ircd::db::prefetcher::ticker
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{
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template<class T> using item = ircd::stats::item<T>;
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// montonic event counts
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item<uint64_t> queries; ///< All incoming user requests
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item<uint64_t> rejects; ///< Queries which were ignored; already cached
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item<uint64_t> request; ///< Prefetcher requests added to the queue
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item<uint64_t> directs; ///< Direct dispatches to db::request pool
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item<uint64_t> handles; ///< Incremented before dispatch to db::request
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item<uint64_t> handled; ///< Incremented after dispatch to db::request
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item<uint64_t> fetches; ///< Incremented before actual database operation
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item<uint64_t> fetched; ///< Incremented after actual database operation
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item<uint64_t> cancels; ///< Count of canceled operations
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// throughput totals
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item<uint64_t> fetched_bytes_key; ///< Total bytes of key data received
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item<uint64_t> fetched_bytes_val; ///< Total bytes of value data received
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// from last operation only
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item<microseconds> last_snd_req; ///< duration request was queued here
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item<microseconds> last_req_fin; ///< duration for database operation
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// accumulated latency totals
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item<microseconds> accum_snd_req;
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item<microseconds> accum_req_fin;
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ticker();
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};
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