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Adding better timer and testing

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This commit is contained in:
Henry Schreiner 2017-03-30 13:48:06 -04:00
parent ab29808a91
commit 49d1a5da1f
2 changed files with 42 additions and 10 deletions
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39
include/CLI/Timer.hpp
View File

@ -49,12 +49,33 @@ public:
Timer(std::string title="Timer", time_print_t time_print = Simple)
: title_(title), time_print_(time_print), start_(clock::now()) {}
/// Time a function by running it multiple times. Target time is the len to target.
inline std::string time_it(std::function<void()> f, double target_time=1) {
time_point start = start_;
double total_time;
start_ = clock::now();
size_t n = 0;
do {
f();
std::chrono::duration<double> elapsed = clock::now() - start_;
total_time = elapsed.count();
} while (n++ < 100 && total_time < target_time);
std::string out = make_time_str(total_time/n) + " for " + std::to_string(n) + " tries";
start_ = start;
return out;
}
/// This formats the numerical value for the time string
std::string make_time_str() const {
time_point stop = clock::now();
std::chrono::duration<double, std::milli> elapsed = stop - start_;
std::chrono::duration<double> elapsed = stop - start_;
double time = elapsed.count();
return make_time_str(time);
}
std::string make_time_str(double time) const {
auto print_it = [](double x, std::string unit){
char buffer[50];
std::snprintf(buffer, 50, "%.5g", x);
@ -62,14 +83,14 @@ public:
};
// LCOV_EXCL_START
if(time < .001)
return print_it(time*1000000, "ns");
if(time < .000001)
return print_it(time*1000000000, "ns");
else if(time < .001)
return print_it(time*1000000, "us");
else if(time < 1)
return print_it(time*1000, "us");
else if(time < 1000)
return print_it(time, "ms");
return print_it(time*1000, "ms");
else
return print_it(time/1000, "s");
return print_it(time, "s");
// LCOV_EXCL_END
}
@ -79,6 +100,8 @@ public:
}
};
/// This class prints out the time upon destruction
class AutoTimer : public Timer {
public:

13
tests/TimerTest.cpp
View File

@ -25,10 +25,11 @@ TEST(Timer, STimes) {
}
*/
TEST(Timer, NStimes) {
TEST(Timer, UStimes) {
CLI::Timer timer;
std::this_thread::sleep_for(std::chrono::microseconds(2));
std::string output = timer.to_string();
EXPECT_THAT(output, HasSubstr(" ns"));
EXPECT_THAT(output, HasSubstr(" us"));
}
TEST(Timer, BigTimer) {
@ -51,3 +52,11 @@ TEST(Timer, PrintTimer) {
std::string output = out.str();
EXPECT_THAT(output, HasSubstr("Timer"));
}
TEST(Timer, TimeItTimer) {
CLI::Timer timer;
std::string output = timer.time_it([](){
std::this_thread::sleep_for(std::chrono::milliseconds(10));}, .1);
std::cout << output << std::endl;
EXPECT_THAT(output, HasSubstr("ms"));
}