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/*-
* Public Domain 2014-present MongoDB, Inc.
* Public Domain 2008-2014 WiredTiger, Inc.
*
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef RUNTIME_MONITOR_H
#define RUNTIME_MONITOR_H
#include <thread>
extern "C" {
#include "wiredtiger.h"
}
#include "api_const.h"
#include "component.h"
#include "connection_manager.h"
#include "debug_utils.h"
namespace test_harness {
/* Static statistic get function. */
static void
get_stat(WT_CURSOR *cursor, int stat_field, int64_t *valuep)
{
const char *desc, *pvalue;
cursor->set_key(cursor, stat_field);
testutil_check(cursor->search(cursor));
testutil_check(cursor->get_value(cursor, &desc, &pvalue, valuep));
}
class statistic {
public:
statistic(configuration *config)
{
testutil_assert(config != nullptr);
testutil_check(config->get_bool(ENABLED, _enabled));
}
/* Check that the given statistic is within bounds. */
virtual void check(WT_CURSOR *cursor) = 0;
/* Suppress warning about destructor being non-virtual. */
virtual ~statistic() {}
bool
is_enabled() const
{
return _enabled;
}
protected:
bool _enabled = false;
};
class cache_limit_statistic : public statistic {
public:
cache_limit_statistic(configuration *config) : statistic(config)
{
testutil_check(config->get_int(LIMIT, limit));
}
void
check(WT_CURSOR *cursor)
{
testutil_assert(cursor != nullptr);
int64_t cache_bytes_image, cache_bytes_other, cache_bytes_max;
double use_percent;
/* Three statistics are required to compute cache use percentage. */
get_stat(cursor, WT_STAT_CONN_CACHE_BYTES_IMAGE, &cache_bytes_image);
get_stat(cursor, WT_STAT_CONN_CACHE_BYTES_OTHER, &cache_bytes_other);
get_stat(cursor, WT_STAT_CONN_CACHE_BYTES_MAX, &cache_bytes_max);
/*
* Assert that we never exceed our configured limit for cache usage. Add 0.0 to avoid
* floating point conversion errors.
*/
use_percent = ((cache_bytes_image + cache_bytes_other + 0.0) / cache_bytes_max) * 100;
if (use_percent > limit) {
std::string error_string =
"runtime_monitor: Cache usage exceeded during test! Limit: " + std::to_string(limit) +
" usage: " + std::to_string(use_percent);
debug_info(error_string, _trace_level, DEBUG_ERROR);
testutil_assert(use_percent < limit);
} else
debug_info("Usage: " + std::to_string(use_percent), _trace_level, DEBUG_TRACE);
}
private:
int64_t limit;
};
/*
* The runtime monitor class is designed to track various statistics or other runtime signals
* relevant to the given workload.
*/
class runtime_monitor : public component {
public:
runtime_monitor(configuration *config) : component(config) {}
~runtime_monitor()
{
for (auto &it : _stats)
delete it;
_stats.clear();
}
/* Delete copy constructor. */
runtime_monitor(const runtime_monitor &) = delete;
void
load()
{
WT_CONFIG_ITEM nested;
std::string statistic_list;
/* Parse the configuration for the runtime monitor. */
testutil_check(_config->get_int(RATE_PER_SECOND, _ops));
/* Load known statistics. */
testutil_check(_config->get(STAT_CACHE_SIZE, &nested));
configuration sub_config = configuration(nested);
_stats.push_back(new cache_limit_statistic(&sub_config));
_running = true;
}
void
run()
{
WT_SESSION *session = connection_manager::instance().create_session();
WT_CURSOR *cursor = nullptr;
/* Open a statistics cursor. */
testutil_check(session->open_cursor(session, STATISTICS_URI, nullptr, nullptr, &cursor));
while (_running) {
/* Sleep so that we do x operations per second. To be replaced by throttles. */
std::this_thread::sleep_for(std::chrono::milliseconds(1000 / _ops));
for (const auto &it : _stats) {
if (it->is_enabled())
it->check(cursor);
}
}
}
private:
int64_t _ops;
std::vector<statistic *> _stats;
};
} // namespace test_harness
#endif
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