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#include <chrono>
#include <cstdint>
#include <print>
#include <random>
#include <string>
#include <string_view>
#include <vector>
#include <boost/sqlite.hpp>
void parse_int(std::string_view arg, std::uint64_t &i) {
auto [_, ec] = std::from_chars(arg.data(), arg.data() + arg.size(), i);
if (ec == std::errc{}) {
return;
} else {
throw std::runtime_error(std::format("failed to parse {} as u64", arg));
}
}
int main(int argc, char **argv) {
if (argc < 3) {
std::println(stderr, "usage: bench <database> <limit> [seed]");
return 1;
}
auto *path = argv[1];
auto *limit = argv[2];
std::uint64_t seed;
if (argc > 3) {
try {
parse_int(argv[3], seed);
} catch (std::exception &e) {
std::println(stderr, "{}", e.what());
return 1;
}
} else {
seed = std::chrono::system_clock::now().time_since_epoch().count();
}
std::default_random_engine rng{seed};
std::println(stderr, "starting benchmark");
boost::sqlite::connection connection{path};
std::vector<std::string> keys;
auto st = connection.prepare("select kv.key from kv limit ?");
for (const auto row : st.execute({limit})) {
auto key = row.at(0).get_text();
keys.push_back(key);
}
std::shuffle(keys.begin(), keys.end(), rng);
std::println(stderr, "slurped {} keys into memory", keys.size());
auto start = std::chrono::system_clock::now();
st = connection.prepare("select kv.value from kv where kv.key=?");
for (const auto &key : keys) {
auto row = st.execute({key});
if (row.done()) {
std::println(stderr, "found no value for key: {}", key);
} else {
continue;
}
}
auto end = std::chrono::system_clock::now();
std::chrono::duration<double> d = end - start;
std::println(stderr, "selected {} keys in {} ({})", keys.size(), d,
keys.size() / d.count());
return 0;
}
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