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/**
** \file misc/timer.cc
** \brief Implementation for misc/timer.hh.
*/
#include <iomanip>
#include <sys/times.h>
#include <unistd.h>
#include <misc/contract.hh>
#include <misc/timer.hh>
namespace misc
{
/*-----------------.
| timer::time_var. |
`-----------------*/
timer::time_var::time_var()
: initial(true)
{}
void timer::time_var::start()
{
struct tms tms;
begin.wall = times(&tms);
begin.user = tms.tms_utime;
begin.sys = tms.tms_stime;
if (initial)
{
initial = false;
first = begin;
}
}
void timer::time_var::stop()
{
struct tms tms;
last.wall = times(&tms);
last.user = tms.tms_utime;
last.sys = tms.tms_stime;
elapsed.wall += last.wall - begin.wall;
elapsed.user += last.user - begin.user;
elapsed.sys += last.sys - begin.sys;
}
bool timer::time_var::is_zero()
{
return elapsed.wall == 0 && elapsed.user == 0 && elapsed.sys == 0;
}
/*--------.
| timer. |
`--------*/
timer::timer()
: dump_stream(nullptr)
{}
// Duplicate a timer. No tasks should be running.
timer::timer(const timer& rhs)
: intmap(rhs.intmap)
, total(rhs.total)
, dump_stream(rhs.dump_stream)
{
precondition(rhs.tasks.empty());
for (const task_map_type::value_type& p : rhs.tasksmap)
if (tasksmap.find(p.first) == tasksmap.end())
tasksmap[p.first] = new time_var(*p.second);
}
timer::~timer()
{
// Print information if automatic dumping has been enabled.
if (dump_stream)
{
// Consider that if the tasks were not properly closed, then
// stop was not invoked either.
if (!tasks.empty())
{
do
pop();
while (!tasks.empty());
stop();
}
dump(*dump_stream);
}
// Deallocate all our time_var's.
for (task_map_type::value_type& p : tasksmap)
delete p.second;
}
void timer::name(int i, const std::string& task_name)
{
intmap[i] = task_name;
}
void timer::timeinfo(long time, long total_time, std::ostream& out)
{
out << std::setiosflags(std::ios::left) << std::setw(6)
<< std::setprecision(6) << float(time) / clocks_per_sec
<< std::resetiosflags(std::ios::left) << " (" << std::setw(5)
<< std::setprecision(3)
<< (total_time ? float(time) * 100 / total_time : float(time)) << "%) ";
}
void timer::dump(std::ostream& out)
{
out << "Execution times (seconds)\n";
for (const task_map_type::value_type& p : tasksmap)
{
if (!p.second->is_zero())
{
out << " " << p.first << std::setw(26 - p.first.length()) << ": ";
timeinfo(p.second->elapsed.user, total.elapsed.user, out);
out << " ";
timeinfo(p.second->elapsed.sys, total.elapsed.sys, out);
out << " ";
timeinfo(p.second->elapsed.wall, total.elapsed.wall, out);
out << '\n';
}
}
out << '\n';
out << "Cumulated times (seconds)\n";
for (const task_map_type::value_type& p : tasksmap)
{
if (p.second->last.wall != p.second->first.wall)
{
out << " " << p.first << std::setw(26 - p.first.length()) << ": ";
timeinfo(p.second->last.user - p.second->first.user,
total.elapsed.user, out);
out << " ";
timeinfo(p.second->last.sys - p.second->first.sys,
total.elapsed.sys, out);
out << " ";
timeinfo(p.second->last.wall - p.second->first.wall,
total.elapsed.wall, out);
out << '\n';
}
}
out << '\n';
out << " TOTAL (seconds)" << std::setw(11) << ": "
<< std::setiosflags(std::ios::left) << std::setw(7)
<< float(total.elapsed.user) / clocks_per_sec << std::setw(11)
<< "user,"
<< std::setw(7) << float(total.elapsed.sys) / clocks_per_sec
<< std::setw(11) << "system,"
<< std::setw(7) << float(total.elapsed.wall) / clocks_per_sec << "wall"
<< std::resetiosflags(std::ios::left) << std::endl;
}
void timer::push(const std::string& task_name)
{
time_var* current;
// If the stack is not empty, set the elapsed time for the current
// task.
if (!tasks.empty())
tasks.top()->stop();
if (tasksmap.find(task_name) == tasksmap.end())
tasksmap[task_name] = new time_var;
current = tasksmap[task_name];
tasks.push(current);
current->start();
}
void timer::pop()
{
precondition(!tasks.empty());
// Set the elapsed time for the current task before popping it.
tasks.top()->stop();
tasks.pop();
// Set the start time of the previous task to the current time.
if (!tasks.empty())
tasks.top()->start();
}
timer& timer::operator<<(const timer& rhs)
{
// No task should be running when merging timers.
precondition(rhs.tasks.empty());
for (const task_map_type::value_type& p : rhs.tasksmap)
if (tasksmap.find(p.first) == tasksmap.end())
tasksmap[p.first] = new time_var(*p.second);
intmap.insert(rhs.intmap.begin(), rhs.intmap.end());
return *this;
}
const long timer::clocks_per_sec = sysconf(_SC_CLK_TCK);
} // namespace misc
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