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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef KeyValueHistogram_H
#define KeyValueHistogram_H
#include <map>
#include <string>
#include "common/Formatter.h"
/**
*
* Key Value DB Histogram generator
*
*/
struct KeyValueHistogram {
struct value_dist {
uint64_t count;
uint32_t max_len;
};
struct key_dist {
uint64_t count;
uint32_t max_len;
std::map<int, struct value_dist> val_map; ///< slab id to count, max length of value and key
};
std::map<std::string, std::map<int, struct key_dist> > key_hist;
std::map<int, uint64_t> value_hist;
int get_key_slab(size_t sz);
std::string get_key_slab_to_range(int slab);
int get_value_slab(size_t sz);
std::string get_value_slab_to_range(int slab);
void update_hist_entry(std::map<std::string, std::map<int, struct key_dist> >& key_hist,
const std::string& prefix, size_t key_size, size_t value_size);
void dump(ceph::Formatter* f);
};
#endif
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