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#ifndef __EVENT_COUNTER_H
#define __EVENT_COUNTER_H
#include <cctype>
#ifndef _MSC_VER
#include <dirent.h>
#endif
#include <cinttypes>
#include <cstring>
#include <chrono>
#include <vector>
#include "linux-perf-events.h"
#ifdef __linux__
#include <libgen.h>
#endif
#if __APPLE__ && __aarch64__
#include "apple_arm_events.h"
#endif
struct event_count {
std::chrono::duration<double> elapsed;
std::vector<unsigned long long> event_counts;
event_count() : elapsed(0), event_counts{0, 0, 0, 0, 0} {}
event_count(const std::chrono::duration<double> _elapsed,
const std::vector<unsigned long long> _event_counts)
: elapsed(_elapsed), event_counts(_event_counts) {}
event_count(const event_count &other)
: elapsed(other.elapsed), event_counts(other.event_counts) {}
// The types of counters (so we can read the getter more easily)
enum event_counter_types {
CPU_CYCLES = 0,
INSTRUCTIONS = 1,
BRANCHES = 2,
MISSED_BRANCHES = 3
};
double elapsed_sec() const {
return std::chrono::duration<double>(elapsed).count();
}
double elapsed_ns() const {
return std::chrono::duration<double, std::nano>(elapsed).count();
}
double cycles() const {
return static_cast<double>(event_counts[CPU_CYCLES]);
}
double instructions() const {
return static_cast<double>(event_counts[INSTRUCTIONS]);
}
double branches() const {
return static_cast<double>(event_counts[BRANCHES]);
}
double missed_branches() const {
return static_cast<double>(event_counts[MISSED_BRANCHES]);
}
event_count &operator=(const event_count &other) {
this->elapsed = other.elapsed;
this->event_counts = other.event_counts;
return *this;
}
event_count operator+(const event_count &other) const {
return event_count(elapsed + other.elapsed,
{
event_counts[0] + other.event_counts[0],
event_counts[1] + other.event_counts[1],
event_counts[2] + other.event_counts[2],
event_counts[3] + other.event_counts[3],
event_counts[4] + other.event_counts[4],
});
}
void operator+=(const event_count &other) { *this = *this + other; }
};
struct event_aggregate {
bool has_events = false;
int iterations = 0;
event_count total{};
event_count best{};
event_count worst{};
event_aggregate() = default;
void operator<<(const event_count &other) {
if (iterations == 0 || other.elapsed < best.elapsed) {
best = other;
}
if (iterations == 0 || other.elapsed > worst.elapsed) {
worst = other;
}
iterations++;
total += other;
}
double elapsed_sec() const { return total.elapsed_sec() / iterations; }
double elapsed_ns() const { return total.elapsed_ns() / iterations; }
double cycles() const { return total.cycles() / iterations; }
double instructions() const { return total.instructions() / iterations; }
double branches() const { return total.branches() / iterations; }
double missed_branches() const {
return total.missed_branches() / iterations;
}
};
struct event_collector {
event_count count{};
std::chrono::time_point<std::chrono::steady_clock> start_clock{};
#if defined(__linux__)
LinuxEvents<PERF_TYPE_HARDWARE> linux_events;
event_collector()
: linux_events(std::vector<int>{
PERF_COUNT_HW_CPU_CYCLES, PERF_COUNT_HW_INSTRUCTIONS,
PERF_COUNT_HW_BRANCH_INSTRUCTIONS, // Retired branch instructions
PERF_COUNT_HW_BRANCH_MISSES}) {}
bool has_events() { return linux_events.is_working(); }
#elif __APPLE__ && __aarch64__
performance_counters diff;
event_collector() : diff(0) { setup_performance_counters(); }
bool has_events() { return setup_performance_counters(); }
#else
event_collector() {}
bool has_events() { return false; }
#endif
inline void start() {
#if defined(__linux)
linux_events.start();
#elif __APPLE__ && __aarch64__
if (has_events()) {
diff = get_counters();
}
#endif
start_clock = std::chrono::steady_clock::now();
}
inline event_count &end() {
const auto end_clock = std::chrono::steady_clock::now();
#if defined(__linux)
linux_events.end(count.event_counts);
#elif __APPLE__ && __aarch64__
if (has_events()) {
performance_counters end = get_counters();
diff = end - diff;
}
count.event_counts[0] = diff.cycles;
count.event_counts[1] = diff.instructions;
count.event_counts[2] = diff.branches;
count.event_counts[3] = diff.missed_branches;
count.event_counts[4] = 0;
#endif
count.elapsed = end_clock - start_clock;
return count;
}
};
#endif
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