rocksdb/util/statistics.cc

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#include "leveldb/statistics.h"
#include <cstdio>
namespace leveldb {
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 leveldb