mirror of https://github.com/facebook/rocksdb.git
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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#include "rocksdb/statistics.h"
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#include <cstdio>
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namespace rocksdb {
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namespace {
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// a buffer size used for temp string buffers
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const int kBufferSize = 200;
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std::string HistogramToString (
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Statistics* dbstats,
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const Histograms& histogram_type,
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const std::string& name) {
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char buffer[kBufferSize];
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HistogramData histogramData;
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dbstats->histogramData(histogram_type, &histogramData);
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snprintf(
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buffer,
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kBufferSize,
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"%s statistics Percentiles :=> 50 : %f 95 : %f 99 : %f\n",
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name.c_str(),
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histogramData.median,
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histogramData.percentile95,
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histogramData.percentile99
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);
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return std::string(buffer);
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};
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std::string TickerToString (
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Statistics* dbstats,
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const Tickers& ticker,
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const std::string& name) {
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char buffer[kBufferSize];
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snprintf(buffer, kBufferSize, "%s COUNT : %ld\n",
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name.c_str(), dbstats->getTickerCount(ticker));
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return std::string(buffer);
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};
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} // namespace
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std::string Statistics::ToString() {
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std::string res;
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res.reserve(20000);
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for (const auto& t : TickersNameMap) {
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res.append(TickerToString(this, t.first, t.second));
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}
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for (const auto& h : HistogramsNameMap) {
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res.append(HistogramToString(this, h.first, h.second));
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}
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res.shrink_to_fit();
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return res;
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}
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} // namespace rocksdb
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