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/*
Copyright 2018-2022, Barcelona Supercomputing Center (BSC), Spain
Copyright 2015-2022, Johannes Gutenberg Universitaet Mainz, Germany
This software was partially supported by the
EC H2020 funded project NEXTGenIO (Project ID: 671951, www.nextgenio.eu).
This software was partially supported by the
ADA-FS project under the SPPEXA project funded by the DFG.
This file is part of GekkoFS.
GekkoFS is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GekkoFS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GekkoFS. If not, see <https://www.gnu.org/licenses/>.
SPDX-License-Identifier: GPL-3.0-or-later
*/
#ifndef GKFS_COMMON_STATS_HPP
#define GKFS_COMMON_STATS_HPP
#include <cstdint>
#include <unistd.h>
#include <cassert>
#include <map>
#include <vector>
#include <deque>
#include <chrono>
#include <initializer_list>
/**
* Provides storage capabilities to provide stats about GekkoFS
* The information is per server.
* We do not provide accurate stats for 1-5-10 minute stats
*
*/
namespace gkfs::utils {
/*
Number of operations (Create, write/ read, remove, mkdir...)
Size of database (metadata keys, should be not needed, any)
Size of data (+write - delete)
Server Bandwidth (write / read operations)
mean, (lifetime of the server)
1 minute mean
5 minute mean
10 minute mean
To provide the stats that we need,
we need to store the info and the timestamp to calculate it
A vector should work, with a maximum of elements,
The stats will only be calculated when requested
a cached value will be send (with a deadline)
*/
class Stats{
enum class IOPS_OP {
IOPS_CREATE,
IOPS_WRITE,
IOPS_READ,
IOPS_MKDIR,
IOPS_RMDIR,
IOPS_REMOVE,
};
constexpr static const std::initializer_list<Stats::IOPS_OP> all_IOPS_OP = {IOPS_OP::IOPS_CREATE, IOPS_OP::IOPS_WRITE, IOPS_OP::IOPS_READ, IOPS_OP::IOPS_MKDIR,IOPS_OP::IOPS_RMDIR, IOPS_OP::IOPS_REMOVE};
enum class SIZE_OP {
METADATA_SIZE,
WRITE_SIZE,
READ_SIZE,
DATA_SIZE
};
constexpr static const std::initializer_list<Stats::SIZE_OP> all_SIZE_OP = {SIZE_OP::METADATA_SIZE, SIZE_OP::DATA_SIZE, SIZE_OP::WRITE_SIZE, SIZE_OP::READ_SIZE};
std::chrono::time_point<std::chrono::steady_clock> last_cached;
/* Measures when we started the server */
std::chrono::time_point<std::chrono::steady_clock> start;
// How many stats will be stored
const unsigned int MAX_STATS = 1000000;
// Stores total value for global mean
std::map <IOPS_OP, unsigned long> IOPS;
std::map <SIZE_OP, unsigned long> SIZE;
// Stores timestamp when an operation comes
// removes if first operation if > 10 minutes
// Different means will be stored and cached 1 minuted
std::map <IOPS_OP, std::deque< std::chrono::time_point<std::chrono::steady_clock> > > TIME_IOPS;
// We will store 1, 5, and 10 minute mean;
std::map <IOPS_OP, std::vector<double> > CACHED_IOPS;
// For size operations we need to store the timestamp and
// the size
std::map <enum SIZE_OP,
std::deque <
std::pair < std::chrono::time_point<std::chrono::steady_clock> , unsigned long long > >
> TIME_SIZE;
// We will store 1, 5, and 10 minute mean;
std::map < enum SIZE_OP, std::vector <double> > CACHED_SIZE;
/**
* @brief Starts the Stats module and initializes structures
*
*/
public:
Stats();
/**
* Add a new value for a IOPS, that does not involve any size
* No value needed as they are simple (1 create, 1 read...)
* Size operations internally call this operation (read,write)
*
* @param IOPS_OP Which operation to add
*/
void add_value_iops (enum IOPS_OP);
/**
* @brief Store a new stat point, with a size value.
* If it involves a IO operations it will call the corresponding
* operation
*
* @param SIZE_OP Which operation we refer
* @param value to store (SIZE_OP)
*/
void add_value_size (enum SIZE_OP, unsigned long long value);
/**
* @brief Get the total mean value of the asked stat
* This can be provided inmediately without cost
* @return mean value
*/
double get_mean (enum IOPS_OP);
/**
* @brief Get the total mean value of the asked stat
* This can be provided inmediately without cost
* @return mean value
*/
double get_mean (enum SIZE_OP);
/**
* @brief Get all the means (total, 1,5 and 10 minutes) for a SIZE_OP
* Returns precalculated values if we just calculated them 1 minute ago
*
* @return std::vector< double > with 4 means
*/
std::vector< double > get_four_means (enum SIZE_OP);
/**
* @brief Get all the means (total, 1,5 and 10 minutes) for a IOPS_OP
* Returns precalculated values if we just calculated them 1 minute ago
*
* @return std::vector< double > with 4 means
*/
std::vector< double > get_four_means (enum IOPS_OP);
};
} // namespace gkfs::utils
#endif // GKFS_COMMON_STATS_HPP