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rocksdb/util/statistics.cc

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2.8 KiB

// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
#include "util/statistics.h"
#include "rocksdb/statistics.h"
#include <algorithm>
#include <cstdio>
namespace rocksdb {
std::shared_ptr<Statistics> CreateDBStatistics() {
return std::make_shared<StatisticsImpl>();
}
StatisticsImpl::StatisticsImpl() {
// Fill tickers_ with "zero". To ensure plasform indepedent, we used
// uint_fast64_t() instead literal `0` to represent zero.
std::fill(tickers_, tickers_ + TICKER_ENUM_MAX, uint_fast64_t());
}
StatisticsImpl::~StatisticsImpl() {}
long StatisticsImpl::getTickerCount(Tickers tickerType) {
assert(tickerType < TICKER_ENUM_MAX);
return tickers_[tickerType];
}
void StatisticsImpl::setTickerCount(Tickers tickerType, uint64_t count) {
assert(tickerType < TICKER_ENUM_MAX);
tickers_[tickerType] = count;
}
void StatisticsImpl::recordTick(Tickers tickerType, uint64_t count) {
assert(tickerType < TICKER_ENUM_MAX);
tickers_[tickerType] += count;
}
void StatisticsImpl::measureTime(Histograms histogramType, uint64_t value) {
assert(histogramType < HISTOGRAM_ENUM_MAX);
histograms_[histogramType].Add(value);
}
void StatisticsImpl::histogramData(Histograms histogramType,
HistogramData* const data) {
assert(histogramType < HISTOGRAM_ENUM_MAX);
histograms_[histogramType].Data(data);
}
namespace {
// a buffer size used for temp string buffers
const int kBufferSize = 200;
std::string HistogramToString (
Statistics* dbstats,
const Histograms& histogram_type,
const std::string& name) {
char buffer[kBufferSize];
HistogramData histogramData;
dbstats->histogramData(histogram_type, &histogramData);
snprintf(
buffer,
kBufferSize,
"%s statistics Percentiles :=> 50 : %f 95 : %f 99 : %f\n",
name.c_str(),
histogramData.median,
histogramData.percentile95,
histogramData.percentile99
);
return std::string(buffer);
};
std::string TickerToString(Statistics* dbstats, const Tickers& ticker,
const std::string& name) {
char buffer[kBufferSize];
snprintf(buffer, kBufferSize, "%s COUNT : %ld\n",
name.c_str(), dbstats->getTickerCount(ticker));
return std::string(buffer);
};
} // namespace
std::string Statistics::ToString() {
std::string res;
res.reserve(20000);
for (const auto& t : TickersNameMap) {
res.append(TickerToString(this, t.first, t.second));
}
for (const auto& h : HistogramsNameMap) {
res.append(HistogramToString(this, h.first, h.second));
}
res.shrink_to_fit();
return res;
}
} // namespace rocksdb