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Unit testing: add facilities to check benchmark results.
This is needed for examining the values of user counters (needed for #348). It is also needed for checking the values of standard benchmark results like items_processed or complexities (for example, checking the standard deviation is needed for unit testing #357 as discussed in #362).
This commit is contained in:
Joao Paulo Magalhaes
parent
693a43013d
commit
6452883027
@ -58,6 +58,79 @@ int SetSubstitutions(
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// Run all output tests.
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void RunOutputTests(int argc, char* argv[]);
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// ========================================================================= //
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// ------------------------- Results checking ------------------------------ //
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// ========================================================================= //
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struct ResultsCheckerEntry;
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typedef std::function< void(ResultsCheckerEntry const&) > ResultsCheckFn;
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// Class to test the results of a benchmark.
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// It inspects the results by looking at the CSV output of a subscribed
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// benchmark.
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struct ResultsCheckerEntry {
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std::string name;
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std::map< std::string, std::string > values;
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ResultsCheckFn check_fn;
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// int NumThreads() const; // TODO
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// double duration_real_time() const {} // TODO
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// double duration_cpu_time() const {} // TODO
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// get the string for a result by name, or nullptr if the name
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// is not found
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const std::string* Get(std::string const& entry_name) const {
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auto it = values.find(entry_name);
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if(it == values.end()) return nullptr;
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return &it->second;
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}
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// get a result by name, parsed as a specific type.
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// For counters, use GetCounterAs instead.
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template< class T > T GetAs(std::string const& entry_name) const {
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auto *sv = Get(entry_name);
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CHECK(sv != nullptr && !sv->empty());
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std::stringstream ss;
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ss << *sv;
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T out;
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ss >> out;
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CHECK(!ss.fail());
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return out;
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}
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// counters are written as doubles, so they have to be read first
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// as a double, and only then converted to the asked type.
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template< class T > T GetCounterAs(std::string const& entry_name) const {
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double dval = GetAs< double >(entry_name);
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T tval = static_cast< T >(dval);
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return tval;
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}
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};
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#define _CHECK_RESULT_VALUE(entry, getfn, var_type, var_name, relationship, value) \
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CONCAT(CHECK_, relationship)(entry.getfn< var_type >(var_name), (value)) \
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<< "\n" << __FILE__ << ":" << __LINE__ << ": " \
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<< entry.name << ": expected (" << #var_type << ")" \
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<< var_name << "=" << entry.GetAs< var_type >(var_name) \
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<< " to be " #relationship " to " << (value);
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#define CHECK_RESULT_VALUE(entry, var_type, var_name, relationship, value) \
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_CHECK_RESULT_VALUE(entry, GetAs, var_type, var_name, relationship, value)
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#define CHECK_COUNTER_VALUE(entry, var_type, var_name, relationship, value) \
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_CHECK_RESULT_VALUE(entry, GetCounterAs, var_type, var_name, relationship, value)
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#define CHECK_BENCHMARK_RESULTS(bm_name, checker_function) \
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size_t CONCAT(dummy, __LINE__) = AddChecker(bm_name, checker_function)
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// Add a function to check the (CSV) results of a benchmark. These
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// functions will be called only after the output was successfully
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// checked.
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size_t AddChecker(const char* bm_name, ResultsCheckFn fn);
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// ========================================================================= //
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// --------------------------- Misc Utilities ------------------------------ //
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// ========================================================================= //
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@ -34,6 +34,8 @@ SubMap& GetSubstitutions() {
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static std::string safe_dec_re = "[0-9]*[.]?[0-9]+([eE][-+][0-9]+)?";
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static SubMap map = {
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{"%float", "[0-9]*[.]?[0-9]+([eE][-+][0-9]+)?"},
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// human-readable float
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{"%hrfloat", "[0-9]*[.]?[0-9]+([eE][-+][0-9]+)?[kMGTPEZYmunpfazy]?"},
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{"%int", "[ ]*[0-9]+"},
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{" %s ", "[ ]+"},
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{"%time", "[ ]*[0-9]{1,5} ns"},
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@ -146,8 +148,139 @@ class TestReporter : public benchmark::BenchmarkReporter {
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std::vector<benchmark::BenchmarkReporter *> reporters_;
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};
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}
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} // end namespace internal
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// ========================================================================= //
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// -------------------------- Results checking ----------------------------- //
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// ========================================================================= //
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namespace internal {
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// Utility class to manage subscribers for checking benchmark results.
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// It works by parsing the CSV output to read the results.
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class ResultsChecker {
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public:
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std::map< std::string, ResultsCheckerEntry > results;
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std::vector< std::string > result_names;
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void Add(const std::string& entry_name, ResultsCheckFn fn);
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void CheckResults(std::stringstream& output);
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private:
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ResultsCheckerEntry* Find_(const std::string& entry_name);
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void SetHeader_(const std::string& csv_header);
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void SetValues_(const std::string& entry_csv_line);
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std::vector< std::string > SplitCsv_(std::string const& line);
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};
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// store the static ResultsChecker in a function to prevent initialization
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// order problems
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ResultsChecker& GetResultsChecker() {
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static ResultsChecker rc;
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return rc;
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}
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// add a results checker for a benchmark
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void ResultsChecker::Add(const std::string& entry_name, ResultsCheckFn fn) {
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results[entry_name] = {entry_name, {}, fn};
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}
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// check the results of all subscribed benchmarks
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void ResultsChecker::CheckResults(std::stringstream& output)
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{
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// first reset the stream to the start
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{
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auto start = std::ios::streampos(0);
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// clear before calling tellg()
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output.clear();
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// seek to zero only when needed
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if(output.tellg() > start) output.seekg(start);
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// and just in case
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output.clear();
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}
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// now go over every line and publish it to the ResultsChecker
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std::string line;
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bool on_first = true;
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while (output.eof() == false) {
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CHECK(output.good());
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std::getline(output, line);
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if (on_first) {
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SetHeader_(line); // this is important
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on_first = false;
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continue;
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}
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SetValues_(line);
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}
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// finally we can call the subscribed check functions
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for(const auto& p : results) {
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CHECK(p.second.check_fn);
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p.second.check_fn(p.second);
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}
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}
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// prepare for the names in this header
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void ResultsChecker::SetHeader_(const std::string& csv_header) {
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result_names = SplitCsv_(csv_header);
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}
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// set the values for subscribed benchmarks, and silently ignore all others
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void ResultsChecker::SetValues_(const std::string& entry_csv_line) {
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CHECK(!result_names.empty());
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auto vals = SplitCsv_(entry_csv_line);
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if(vals.empty()) return;
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CHECK_EQ(vals.size(), result_names.size());
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ResultsCheckerEntry* entry = Find_(vals[0]);
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if(!entry) return;
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for (size_t i = 1, e = vals.size(); i < e; ++i) {
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entry->values[result_names[i]] = vals[i];
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}
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}
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// find a subscribed benchmark, or return null
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ResultsCheckerEntry* ResultsChecker::Find_(const std::string& entry_name) {
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auto it = results.find(entry_name);
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if(it == results.end()) return nullptr;
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return &it->second;
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}
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// a quick'n'dirty csv splitter (eliminating quotes)
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std::vector< std::string > ResultsChecker::SplitCsv_(std::string const& line) {
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std::vector< std::string > out;
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if(line.empty()) return out;
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if(!result_names.empty()) out.reserve(result_names.size());
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size_t prev = 0, pos = line.find_first_of(','), curr = pos;
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while(pos != line.npos) {
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CHECK(curr > 0);
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if(line[prev] == '"') ++prev;
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if(line[curr-1] == '"') --curr;
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out.push_back(line.substr(prev, curr-prev));
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prev = pos + 1;
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pos = line.find_first_of(',', pos + 1);
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curr = pos;
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}
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curr = line.size();
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if(line[prev] == '"') ++prev;
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if(line[curr-1] == '"') --curr;
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out.push_back(line.substr(prev, curr-prev));
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return out;
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}
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} // end namespace internal
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size_t AddChecker(const char* bm_name, ResultsCheckFn fn)
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{
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auto &rc = internal::GetResultsChecker();
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rc.Add(bm_name, fn);
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return rc.results.size();
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}
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// ========================================================================= //
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// -------------------------- Public API Definitions------------------------ //
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// ========================================================================= //
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@ -237,4 +370,10 @@ void RunOutputTests(int argc, char* argv[]) {
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std::cout << "\n";
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}
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// now that we know the output is as expected, we can dispatch
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// the checks to subscribees.
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auto &csv = TestCases[2];
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CHECK(strcmp(csv.name, "CSVReporter") == 0); // would use == but gcc spits a warning
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internal::GetResultsChecker().CheckResults(csv.out_stream);
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}
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@ -25,7 +25,7 @@ void BM_Counters_Simple(benchmark::State& state) {
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state.counters["bar"] = 2;
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}
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BENCHMARK(BM_Counters_Simple);//->ThreadRange(1, 32);
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ADD_CASES(TC_ConsoleOut, {{"^BM_Counters_Simple %console_report bar=%float foo=%float$"}});
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ADD_CASES(TC_ConsoleOut, {{"^BM_Counters_Simple %console_report bar=%hrfloat foo=%hrfloat$"}});
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ADD_CASES(TC_JSONOut, {{"\"name\": \"BM_Counters_Simple\",$"},
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{"\"iterations\": %int,$", MR_Next},
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{"\"real_time\": %int,$", MR_Next},
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@ -35,23 +35,28 @@ ADD_CASES(TC_JSONOut, {{"\"name\": \"BM_Counters_Simple\",$"},
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{"\"foo\": %float$", MR_Next},
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{"}", MR_Next}});
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ADD_CASES(TC_CSVOut, {{"^\"BM_Counters_Simple\",%csv_report,%float,%float$"}});
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CHECK_BENCHMARK_RESULTS("BM_Counters_Simple", [](ResultsCheckerEntry const& e) {
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CHECK_COUNTER_VALUE(e, int, "foo", EQ, 1);
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CHECK_COUNTER_VALUE(e, int, "bar", EQ, 2);
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});
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// ========================================================================= //
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// --------------------- Counters+Items+Bytes/s Output --------------------- //
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// ========================================================================= //
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namespace { int num_calls1 = 0; }
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void BM_Counters_WithBytesAndItemsPSec(benchmark::State& state) {
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while (state.KeepRunning()) {
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}
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state.counters["foo"] = 1;
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state.counters["bar"] = 2;
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state.SetItemsProcessed(150);
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state.counters["bar"] = ++num_calls1;
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state.SetBytesProcessed(364);
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state.SetItemsProcessed(150);
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}
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BENCHMARK(BM_Counters_WithBytesAndItemsPSec);//->ThreadRange(1, 32);
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ADD_CASES(TC_ConsoleOut,
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{{"^BM_Counters_WithBytesAndItemsPSec %console_report "
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"bar=%float foo=%float +%floatB/s +%float items/s$"}});
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"bar=%hrfloat foo=%hrfloat +%floatB/s +%float items/s$"}});
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ADD_CASES(TC_JSONOut, {{"\"name\": \"BM_Counters_WithBytesAndItemsPSec\",$"},
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{"\"iterations\": %int,$", MR_Next},
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{"\"real_time\": %int,$", MR_Next},
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@ -64,6 +69,13 @@ ADD_CASES(TC_JSONOut, {{"\"name\": \"BM_Counters_WithBytesAndItemsPSec\",$"},
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{"}", MR_Next}});
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ADD_CASES(TC_CSVOut, {{"^\"BM_Counters_WithBytesAndItemsPSec\","
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"%csv_bytes_items_report,%float,%float$"}});
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CHECK_BENCHMARK_RESULTS("BM_Counters_WithBytesAndItemsPSec",
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[](ResultsCheckerEntry const& e) {
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CHECK_COUNTER_VALUE(e, int, "foo", EQ, 1);
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CHECK_COUNTER_VALUE(e, int, "bar", EQ, num_calls1);
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//TODO CHECK_RESULT_VALUE(e, int, "bytes_per_second", EQ, 364 / e.duration_cpu_time());
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//TODO CHECK_RESULT_VALUE(e, int, "items_per_second", EQ, 150 / e.duration_cpu_time());
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});
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// ========================================================================= //
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// ------------------------- Rate Counters Output -------------------------- //
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@ -77,7 +89,7 @@ void BM_Counters_Rate(benchmark::State& state) {
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state.counters["bar"] = bm::Counter{2, bm::Counter::kIsRate};
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}
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BENCHMARK(BM_Counters_Rate);//->ThreadRange(1, 32);
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ADD_CASES(TC_ConsoleOut, {{"^BM_Counters_Rate %console_report bar=%float foo=%float$"}});
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ADD_CASES(TC_ConsoleOut, {{"^BM_Counters_Rate %console_report bar=%hrfloat foo=%hrfloat$"}});
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ADD_CASES(TC_JSONOut, {{"\"name\": \"BM_Counters_Rate\",$"},
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{"\"iterations\": %int,$", MR_Next},
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{"\"real_time\": %int,$", MR_Next},
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@ -99,7 +111,7 @@ void BM_Counters_Threads(benchmark::State& state) {
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state.counters["bar"] = 2;
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}
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BENCHMARK(BM_Counters_Threads)->ThreadRange(1, 8);
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ADD_CASES(TC_ConsoleOut, {{"^BM_Counters_Threads/threads:%int %console_report bar=%float foo=%float$"}});
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ADD_CASES(TC_ConsoleOut, {{"^BM_Counters_Threads/threads:%int %console_report bar=%hrfloat foo=%hrfloat$"}});
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ADD_CASES(TC_JSONOut, {{"\"name\": \"BM_Counters_Threads/threads:%int\",$"},
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{"\"iterations\": %int,$", MR_Next},
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{"\"real_time\": %int,$", MR_Next},
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@ -122,7 +134,7 @@ void BM_Counters_AvgThreads(benchmark::State& state) {
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state.counters["bar"] = bm::Counter{2, bm::Counter::kAvgThreads};
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}
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BENCHMARK(BM_Counters_AvgThreads)->ThreadRange(1, 8);
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ADD_CASES(TC_ConsoleOut, {{"^BM_Counters_AvgThreads/threads:%int %console_report bar=%float foo=%float$"}});
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ADD_CASES(TC_ConsoleOut, {{"^BM_Counters_AvgThreads/threads:%int %console_report bar=%hrfloat foo=%hrfloat$"}});
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ADD_CASES(TC_JSONOut, {{"\"name\": \"BM_Counters_AvgThreads/threads:%int\",$"},
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{"\"iterations\": %int,$", MR_Next},
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{"\"real_time\": %int,$", MR_Next},
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@ -145,7 +157,7 @@ void BM_Counters_AvgThreadsRate(benchmark::State& state) {
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state.counters["bar"] = bm::Counter{2, bm::Counter::kAvgThreadsRate};
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}
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BENCHMARK(BM_Counters_AvgThreadsRate)->ThreadRange(1, 8);
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ADD_CASES(TC_ConsoleOut, {{"^BM_Counters_AvgThreadsRate/threads:%int %console_report bar=%float foo=%float$"}});
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ADD_CASES(TC_ConsoleOut, {{"^BM_Counters_AvgThreadsRate/threads:%int %console_report bar=%hrfloat foo=%hrfloat$"}});
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ADD_CASES(TC_JSONOut, {{"\"name\": \"BM_Counters_AvgThreadsRate/threads:%int\",$"},
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{"\"iterations\": %int,$", MR_Next},
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{"\"real_time\": %int,$", MR_Next},
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