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/*
* Benchmarking suite for key-value store
*
* September 2, 2012
* Eleanor Cawthon
* eleanor.cawthon@inktank.com
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*/
#ifndef KVSTOREBENCH_H_
#define KVSTOREBENCH_H_
#include <string>
#include <climits>
#include <cfloat>
#include <iostream>
#include "common/Clock.h"
#include "common/Mutex.h"
#include "common/Cond.h"
#include "key_value_store/key_value_structure.h"
#include "key_value_store/kv_flat_btree_async.h"
#include "global/global_context.h"
using namespace std;
using ceph::bufferlist;
/**
* stores pairings from op type to time taken for that op (for latency), and to
* time that op completed to the nearest second (for throughput).
*/
struct kv_bench_data {
JSONFormatter throughput_jf;
JSONFormatter latency_jf;
};
class KvStoreBench;
/**
* keeps track of the number of milliseconds between two events - used to
* measure latency
*/
struct StopWatch {
utime_t begin_time;
utime_t end_time;
void start_time() {
begin_time = ceph_clock_now(g_ceph_context);
}
void stop_time() {
end_time = ceph_clock_now(g_ceph_context);
}
double get_time() {
return (end_time - begin_time) * 1000;
}
void clear() {
begin_time = end_time = utime_t();
}
};
/**
* arguments passed to the callback method when the op is being timed
*/
struct timed_args {
StopWatch sw;
//kv_bench_data data;
KvStoreBench * kvsb;
bufferlist val;
int err;
char op;
timed_args ()
: kvsb(NULL),
err(0),
op(' ')
{};
timed_args (KvStoreBench * k)
: kvsb(k),
err(0),
op(' ')
{}
};
typedef pair<string, bufferlist> (KvStoreBench::*next_gen_t)(bool new_elem);
class KvStoreBench {
protected:
//test setup variables set from command line
int entries; //the number of entries to write initially
int ops; //the number of operations to time
int clients; //the total number of clients running this test - used
//in the aio test to coordinate the end of the initial sets
int key_size;//number of characters in keys to write
int val_size;//number of characters in values to write
int max_ops_in_flight;
bool clear_first;//if true, remove all objects in pool before starting tests
//variables passed to KeyValueStructure
int k;
int cache_size; //number of index entries to store in cache
double cache_refresh; //cache_size / cache_refresh entries are read each time
//the index is read
string client_name;
bool verbose;//if true, display debug output
//internal
map<int, char> probs;//map of numbers from 1 to 100 to chars representing
//operation types - used to generate random operations
set<string> key_set;//set of keys already in the data set
KeyValueStructure * kvs;
kv_bench_data data;//stores throughput and latency from completed tests
Mutex data_lock;
Cond op_avail;//signaled when an op completes
int ops_in_flight;//number of operations currently in progress
Mutex ops_in_flight_lock;
//these are used for cleanup and setup purposes - they are NOT passed to kvs!
librados::Rados rados;
string rados_id;
string pool_name;
librados::IoCtx io_ctx;
/**
* Prints JSON-formatted throughput and latency data.
*
* Throughput data is {'char representing the operation type':time the op
* completed to the nearest second}
* Latency is {'char representing the operation type':time taken by the op}
*/
void print_time_data();
public:
KvStoreBench();
//after this is called, objects created by the KeyValueStructure remain.
~KvStoreBench();
/**
* parses command line arguments, sets up this rados instance, clears the
* pool if clear_first is true and calls kvs->setup.
*/
int setup(int argc, const char** argv);
/**
* Returns a string of random characters of length len
*/
string random_string(int len);
/**
* Inserts entries random keys and values asynchronously.
*/
int test_random_insertions();
/**
* calls test_random_insertions, then does ops randomly chosen operations
* asynchronously, with max_ops_in_flight operations at a time.
*/
int test_teuthology_aio(next_gen_t distr, const map<int, char> &probs);
/**
* calls test_random_insertions, then does ops randomly chosen operations
* synchronously.
*/
int test_teuthology_sync(next_gen_t distr, const map<int, char> &probs);
/**
* returns a key-value pair. If new_elem is true, the key is randomly
* generated. If it is false, the key is selected from the keys currently in
* the key set.
*/
pair<string, bufferlist> rand_distr(bool new_elem);
/**
* Called when aio operations complete. Updates data.
*/
static void aio_callback_timed(int * err, void *arg);
/**
* Calls test_ methods. Change to call, for example, multiple runs of a test
* with different settings. Currently just calls test_teuthology_aio.
*/
int teuthology_tests();
};
#endif /* KVSTOREBENCH_H_ */
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