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/*
* (C) 2018 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/timer.h>
#include <botan/internal/os_utils.h>
#include <algorithm>
#include <sstream>
#include <iomanip>
namespace Botan {
void Timer::start()
{
stop();
m_timer_start = OS::get_system_timestamp_ns();
m_cpu_cycles_start = OS::get_cpu_cycle_counter();
}
void Timer::stop()
{
if(m_timer_start)
{
if(m_cpu_cycles_start != 0)
{
const uint64_t cycles_taken = OS::get_cpu_cycle_counter() - m_cpu_cycles_start;
if(cycles_taken > 0)
{
m_cpu_cycles_used += static_cast<size_t>(cycles_taken * m_clock_cycle_ratio);
}
}
const uint64_t now = OS::get_system_timestamp_ns();
if(now > m_timer_start)
{
const uint64_t dur = now - m_timer_start;
m_time_used += dur;
if(m_event_count == 0)
{
m_min_time = m_max_time = dur;
}
else
{
m_max_time = std::max(m_max_time, dur);
m_min_time = std::min(m_min_time, dur);
}
}
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());
}
std::string Timer::to_string() const
{
if(m_custom_msg.size() > 0)
{
return m_custom_msg;
}
else if(this->buf_size() == 0)
{
return result_string_ops();
}
else
{
return result_string_bps();
}
}
std::string Timer::result_string_bps() const
{
const size_t MiB = 1024 * 1024;
const double MiB_total = static_cast<double>(events()) / MiB;
const double MiB_per_sec = MiB_total / seconds();
std::ostringstream oss;
oss << get_name();
if(!doing().empty())
{
oss << " " << doing();
}
if(buf_size() > 0)
{
oss << " buffer size " << buf_size() << " bytes:";
}
if(events() == 0)
oss << " " << "N/A";
else
oss << " " << std::fixed << std::setprecision(3) << MiB_per_sec << " MiB/sec";
if(cycles_consumed() != 0)
{
const double cycles_per_byte = static_cast<double>(cycles_consumed()) / events();
oss << " " << std::fixed << std::setprecision(2) << cycles_per_byte << " cycles/byte";
}
oss << " (" << MiB_total << " MiB in " << milliseconds() << " ms)\n";
return oss.str();
}
std::string Timer::result_string_ops() const
{
std::ostringstream oss;
oss << get_name() << " ";
if(events() == 0)
{
oss << "no events\n";
}
else
{
oss << static_cast<uint64_t>(events_per_second())
<< ' ' << doing() << "/sec; "
<< std::setprecision(2) << std::fixed
<< ms_per_event() << " ms/op";
if(cycles_consumed() != 0)
{
const double cycles_per_op = static_cast<double>(cycles_consumed()) / events();
const size_t precision = (cycles_per_op < 10000) ? 2 : 0;
oss << " " << std::fixed << std::setprecision(precision) << cycles_per_op << " cycles/op";
}
oss << " (" << events() << " " << (events() == 1 ? "op" : "ops")
<< " in " << milliseconds() << " ms)\n";
}
return oss.str();
}
}
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