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rocksdb/db/perf_context_test.cc

129 lines
3.3 KiB

#include <iostream>
#include <vector>
#include "rocksdb/db.h"
#include "rocksdb/perf_context.h"
#include "util/histogram.h"
#include "util/stop_watch.h"
#include "util/testharness.h"
namespace leveldb {
// Path to the database on file system
const std::string kDbName = test::TmpDir() + "/perf_context_test";
std::shared_ptr<DB> OpenDb(size_t write_buffer_size) {
DB* db;
Options options;
options.create_if_missing = true;
options.write_buffer_size = write_buffer_size;
Status s = DB::Open(options, kDbName, &db);
ASSERT_OK(s);
return std::shared_ptr<DB>(db);
}
class PerfContextTest { };
int kTotalKeys = 100;
TEST(PerfContextTest, StopWatchNanoOverhead) {
// profile the timer cost by itself!
const int kTotalIterations = 1000000;
std::vector<uint64_t> timings(kTotalIterations);
StopWatchNano timer(Env::Default(), true);
for (auto& timing : timings) {
timing = timer.ElapsedNanos(true /* reset */);
}
HistogramImpl histogram;
for (const auto timing : timings) {
histogram.Add(timing);
}
std::cout << histogram.ToString();
}
TEST(PerfContextTest, StopWatchOverhead) {
// profile the timer cost by itself!
const int kTotalIterations = 1000000;
std::vector<uint64_t> timings(kTotalIterations);
StopWatch timer(Env::Default());
for (auto& timing : timings) {
timing = timer.ElapsedMicros();
}
HistogramImpl histogram;
uint64_t prev_timing = 0;
for (const auto timing : timings) {
histogram.Add(timing - prev_timing);
prev_timing = timing;
}
std::cout << histogram.ToString();
}
void ProfileKeyComparison() {
DestroyDB(kDbName, Options()); // Start this test with a fresh DB
auto db = OpenDb(1000000000);
WriteOptions write_options;
ReadOptions read_options;
uint64_t total_user_key_comparison_get = 0;
uint64_t total_user_key_comparison_put = 0;
uint64_t max_user_key_comparison_get = 0;
std::cout << "Inserting " << kTotalKeys << " key/value pairs\n...\n";
for (int i = 0; i < kTotalKeys; ++i) {
std::string key = "k" + std::to_string(i);
std::string value = "v" + std::to_string(i);
perf_context.Reset();
db->Put(write_options, key, value);
total_user_key_comparison_put += perf_context.user_key_comparison_count;
perf_context.Reset();
db->Get(read_options, key, &value);
total_user_key_comparison_get += perf_context.user_key_comparison_count;
max_user_key_comparison_get =
std::max(max_user_key_comparison_get,
perf_context.user_key_comparison_count);
}
std::cout << "total user key comparison get: "
<< total_user_key_comparison_get << "\n"
<< "total user key comparison put: "
<< total_user_key_comparison_put << "\n"
<< "max user key comparison get: "
<< max_user_key_comparison_get << "\n"
<< "avg user key comparison get:"
<< total_user_key_comparison_get/kTotalKeys << "\n";
}
TEST(PerfContextTest, KeyComparisonCount) {
SetPerfLevel(kDisable);
ProfileKeyComparison();
SetPerfLevel(kEnableCount);
ProfileKeyComparison();
SetPerfLevel(kEnableTime);
ProfileKeyComparison();
}
}
int main(int argc, char** argv) {
if (argc > 1) {
leveldb::kTotalKeys = std::stoi(argv[1]);
}
leveldb::test::RunAllTests();
return 0;
}