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/*
* (C) 2018 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "timer.h"
#include <chrono>
#include <iomanip>
#include <sstream>
#if defined(BOTAN_HAS_OS_UTILS)
#include <botan/internal/os_utils.h>
#endif
namespace Botan_CLI {
namespace {
std::string format_timer_name(std::string_view name, std::string_view provider) {
if(provider.empty() || provider == "base") {
return std::string(name);
}
std::ostringstream out;
out << name << " [" << provider << "]";
return out.str();
}
} // namespace
Timer::Timer(std::string_view name,
std::string_view provider,
std::string_view doing,
uint64_t event_mult,
size_t buf_size,
double clock_cycle_ratio,
uint64_t clock_speed) :
m_name(format_timer_name(name, provider)),
m_doing(doing),
m_buf_size(buf_size),
m_event_mult(event_mult),
m_clock_cycle_ratio(clock_cycle_ratio),
m_clock_speed(clock_speed) {}
void Timer::start() {
stop();
m_timer_start = timestamp_ns();
m_cpu_cycles_start = cycle_counter();
}
uint64_t Timer::timestamp_ns() {
auto now = std::chrono::high_resolution_clock::now().time_since_epoch();
return std::chrono::duration_cast<std::chrono::nanoseconds>(now).count();
}
uint64_t Timer::cycle_counter() {
#if defined(BOTAN_HAS_OS_UTILS)
return Botan::OS::get_cpu_cycle_counter();
#else
return 0;
#endif
}
void Timer::stop() {
if(m_timer_start) {
const uint64_t now = timestamp_ns();
if(now > m_timer_start) {
m_time_used += (now - m_timer_start);
}
if(m_cpu_cycles_start != 0) {
const uint64_t cycles_taken = cycle_counter() - m_cpu_cycles_start;
if(cycles_taken > 0) {
m_cpu_cycles_used += static_cast<size_t>(cycles_taken * m_clock_cycle_ratio);
}
}
m_timer_start = 0;
++m_event_count;
}
}
bool Timer::operator<(const Timer& other) const {
if(this->doing() != other.doing()) {
return (this->doing() < other.doing());
}
return (this->get_name() < other.get_name());
}
} // namespace Botan_CLI