mirror of
https://github.com/matrix-construct/construct
synced 2024-11-29 10:12:39 +01:00
101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_DB_PREFETCHER_H
|
|
|
|
namespace ircd::db
|
|
{
|
|
struct prefetcher extern *prefetcher;
|
|
}
|
|
|
|
struct ircd::db::prefetcher
|
|
{
|
|
struct ticker;
|
|
struct request;
|
|
using closure = std::function<bool (request &)>;
|
|
|
|
ctx::dock dock;
|
|
std::deque<request> queue;
|
|
std::unique_ptr<ticker> ticker;
|
|
ctx::context context;
|
|
size_t request_workers {0};
|
|
|
|
size_t wait_pending();
|
|
void request_handle(request &);
|
|
size_t request_cleanup() noexcept;
|
|
void request_worker();
|
|
void handle();
|
|
void worker();
|
|
|
|
public:
|
|
size_t cancel(const closure &);
|
|
size_t cancel(database &); // Cancel all for db
|
|
size_t cancel(column &); // Cancel all for column
|
|
|
|
bool operator()(column &, const string_view &key, const gopts &);
|
|
|
|
prefetcher();
|
|
~prefetcher() noexcept;
|
|
};
|
|
|
|
struct ircd::db::prefetcher::request
|
|
{
|
|
using key_buf = char[208];
|
|
|
|
database *d {nullptr}; // database instance
|
|
uint32_t cid {0}; // column ID
|
|
uint32_t len {0}; // length of key
|
|
steady_point snd; // submitted by user
|
|
steady_point req; // request sent to database
|
|
steady_point fin; // result from database
|
|
key_buf key alignas(16); // key buffer
|
|
|
|
explicit operator string_view() const noexcept;
|
|
|
|
request(database &d, const column &c, const string_view &key) noexcept;
|
|
request() = default;
|
|
};
|
|
|
|
static_assert
|
|
(
|
|
sizeof(ircd::db::prefetcher::request) == 256,
|
|
"struct ircd::db::prefetcher::request fell out of alignment"
|
|
);
|
|
|
|
struct ircd::db::prefetcher::ticker
|
|
{
|
|
template<class T> using item = ircd::stats::item<T>;
|
|
|
|
// montonic event counts
|
|
item<uint64_t> queries; ///< All incoming user requests
|
|
item<uint64_t> rejects; ///< Queries which were ignored; already cached
|
|
item<uint64_t> request; ///< Prefetcher requests added to the queue
|
|
item<uint64_t> directs; ///< Direct dispatches to db::request pool
|
|
item<uint64_t> handles; ///< Incremented before dispatch to db::request
|
|
item<uint64_t> handled; ///< Incremented after dispatch to db::request
|
|
item<uint64_t> fetches; ///< Incremented before actual database operation
|
|
item<uint64_t> fetched; ///< Incremented after actual database operation
|
|
item<uint64_t> cancels; ///< Count of canceled operations
|
|
|
|
// throughput totals
|
|
item<uint64_t> fetched_bytes_key; ///< Total bytes of key data received
|
|
item<uint64_t> fetched_bytes_val; ///< Total bytes of value data received
|
|
|
|
// from last operation only
|
|
item<microseconds> last_snd_req; ///< duration request was queued here
|
|
item<microseconds> last_req_fin; ///< duration for database operation
|
|
|
|
// accumulated latency totals
|
|
item<microseconds> accum_snd_req;
|
|
item<microseconds> accum_req_fin;
|
|
|
|
ticker();
|
|
};
|