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perf_timer: add faster x86_64 timers, and pause/resume

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moneromooo-monero 2018-01-08 10:53:42 +00:00
parent 411da337d2
commit 6cf56682bc
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GPG key ID: 686F07454D6CEFC3
2 changed files with 77 additions and 7 deletions
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79
src/common/perf_timer.cpp
View file

@ -33,6 +33,52 @@
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "perf"
namespace
{
uint64_t get_tick_count()
{
#if defined(__x86_64__)
uint32_t hi, lo;
__asm__ volatile("rdtsc" : "=a"(lo), "=d"(hi));
return (((uint64_t)hi) << 32) | (uint64_t)lo;
#else
return epee::misc_utils::get_ns_count();
#endif
}
#ifdef __x86_64__
uint64_t get_ticks_per_ns()
{
uint64_t t0 = epee::misc_utils::get_ns_count();
uint64_t r0 = get_tick_count();
while (1)
{
uint64_t t = epee::misc_utils::get_ns_count();
if (t - t0 > 1*1000000000) break; // work one second
}
uint64_t t1 = epee::misc_utils::get_ns_count();
uint64_t r1 = get_tick_count();
uint64_t tpns256 = 256 * (r1 - r0) / (t1 - t0);
return tpns256 ? tpns256 : 1;
}
#endif
#ifdef __x86_64__
uint64_t ticks_per_ns = get_ticks_per_ns();
#endif
uint64_t ticks_to_ns(uint64_t ticks)
{
#if defined(__x86_64__)
return 256 * ticks / ticks_per_ns;
#else
return ticks;
#endif
}
}
namespace tools
{
@ -51,9 +97,9 @@ void set_performance_timer_log_level(el::Level level)
performance_timer_log_level = level;
}
PerformanceTimer::PerformanceTimer(const std::string &s, uint64_t unit, el::Level l): name(s), unit(unit), level(l), started(false)
PerformanceTimer::PerformanceTimer(const std::string &s, uint64_t unit, el::Level l): name(s), unit(unit), level(l), started(false), paused(false)
{
ticks = epee::misc_utils::get_ns_count();
ticks = get_tick_count();
if (!performance_timers)
{
MLOG(level, "PERF ----------");
@ -62,9 +108,10 @@ PerformanceTimer::PerformanceTimer(const std::string &s, uint64_t unit, el::Leve
else
{
PerformanceTimer *pt = performance_timers->back();
if (!pt->started)
if (!pt->started && !pt->paused)
{
MLOG(pt->level, "PERF " << std::string((performance_timers->size()-1) * 2, ' ') << " " << pt->name);
size_t size = 0; for (const auto *tmp: *performance_timers) if (!tmp->paused) ++size;
MLOG(pt->level, "PERF " << std::string((size-1) * 2, ' ') << " " << pt->name);
pt->started = true;
}
}
@ -74,10 +121,12 @@ PerformanceTimer::PerformanceTimer(const std::string &s, uint64_t unit, el::Leve
PerformanceTimer::~PerformanceTimer()
{
performance_timers->pop_back();
ticks = epee::misc_utils::get_ns_count() - ticks;
if (!paused)
ticks = get_tick_count() - ticks;
char s[12];
snprintf(s, sizeof(s), "%8llu ", (unsigned long long)ticks / (1000000000 / unit));
MLOG(level, "PERF " << s << std::string(performance_timers->size() * 2, ' ') << " " << name);
snprintf(s, sizeof(s), "%8llu ", (unsigned long long)(ticks_to_ns(ticks) / (1000000000 / unit)));
size_t size = 0; for (const auto *tmp: *performance_timers) if (!tmp->paused || tmp==this) ++size;
MLOG(level, "PERF " << s << std::string(size * 2, ' ') << " " << name);
if (performance_timers->empty())
{
delete performance_timers;
@ -85,4 +134,20 @@ PerformanceTimer::~PerformanceTimer()
}
}
void PerformanceTimer::pause()
{
if (paused)
return;
ticks = get_tick_count() - ticks;
paused = true;
}
void PerformanceTimer::resume()
{
if (!paused)
return;
ticks = get_tick_count() - ticks;
paused = false;
}
}

5
src/common/perf_timer.h
View file

@ -48,6 +48,8 @@ class PerformanceTimer
public:
PerformanceTimer(const std::string &s, uint64_t unit, el::Level l = el::Level::Debug);
~PerformanceTimer();
void pause();
void resume();
private:
std::string name;
@ -55,6 +57,7 @@ private:
el::Level level;
uint64_t ticks;
bool started;
bool paused;
};
void set_performance_timer_log_level(el::Level level);
@ -66,5 +69,7 @@ void set_performance_timer_log_level(el::Level level);
#define PERF_TIMER_START_UNIT(name, unit) std::unique_ptr<tools::PerformanceTimer> pt_##name(new tools::PerformanceTimer(#name, unit, el::Level::Info))
#define PERF_TIMER_START(name) PERF_TIMER_START_UNIT(name, 1000)
#define PERF_TIMER_STOP(name) do { pt_##name.reset(NULL); } while(0)
#define PERF_TIMER_PAUSE(name) pt_##name->pause()
#define PERF_TIMER_RESUME(name) pt_##name->resume()
}