8a75b54735
Especially on windows, direct output to `cout` via `<<` is very expensive. Instead, use fmtlib to do all formatting into a no-alloc `fmt::memory_buffer`, and output that with one call to `cout`. timeit utilities are not used much by default, but during development or profiling one often uncomments macros like `DEBUG_TIME` that then enable `SCOPED_TIMER` or `SCOPED_TIMER_AVERAGED`. Having one `SCOPED_TIMER_AVERAGED` inside sequencer `draw_channels`, with empty timeline and all default channels; the overhead in % of `draw_channels` duration of said scoped timer before and after this change: - Windows: 29% -> 5% - Mac: 5.0% -> 4.4% Pull Request: https://projects.blender.org/blender/blender/pulls/115233
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "BLI_timeit.hh"
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#include <algorithm>
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#include <iomanip>
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#include <iostream>
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#include <string_view>
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#include <fmt/format.h>
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namespace blender::timeit {
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static void format_duration(Nanoseconds duration, fmt::memory_buffer &buf)
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{
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using namespace std::chrono;
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if (duration < microseconds(100)) {
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fmt::format_to(fmt::appender(buf), FMT_STRING("{} ns"), duration.count());
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}
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else if (duration < seconds(5)) {
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fmt::format_to(fmt::appender(buf), FMT_STRING("{:.2f} ms"), duration.count() / 1.0e6);
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}
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else if (duration > seconds(90)) {
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/* Long durations: print seconds, and also H:m:s */
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const auto dur_hours = duration_cast<hours>(duration);
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const auto dur_mins = duration_cast<minutes>(duration - dur_hours);
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const auto dur_sec = duration_cast<seconds>(duration - dur_hours - dur_mins);
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fmt::format_to(fmt::appender(buf),
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FMT_STRING("{:.1f} s ({}H:{}m:{}s)"),
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duration.count() / 1.0e9,
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dur_hours.count(),
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dur_mins.count(),
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dur_sec.count());
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}
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else {
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fmt::format_to(fmt::appender(buf), FMT_STRING("{:.1f} s"), duration.count() / 1.0e9);
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}
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}
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void print_duration(Nanoseconds duration)
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{
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fmt::memory_buffer buf;
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format_duration(duration, buf);
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std::cout << std::string_view(buf.data(), buf.size());
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}
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ScopedTimer::~ScopedTimer()
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{
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const TimePoint end = Clock::now();
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const Nanoseconds duration = end - start_;
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fmt::memory_buffer buf;
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fmt::format_to(fmt::appender(buf), FMT_STRING("Timer '{}' took "), name_);
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format_duration(duration, buf);
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buf.append(std::string_view("\n"));
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std::cout << std::string_view(buf.data(), buf.size());
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}
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ScopedTimerAveraged::~ScopedTimerAveraged()
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{
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const TimePoint end = Clock::now();
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const Nanoseconds duration = end - start_;
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total_count_++;
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total_time_ += duration;
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min_time_ = std::min(duration, min_time_);
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fmt::memory_buffer buf;
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fmt::format_to(fmt::appender(buf), FMT_STRING("Timer '{}': (Average: "), name_);
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format_duration(total_time_ / total_count_, buf);
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buf.append(std::string_view(", Min: "));
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format_duration(min_time_, buf);
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buf.append(std::string_view(", Last: "));
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format_duration(duration, buf);
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buf.append(std::string_view(")\n"));
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std::cout << std::string_view(buf.data(), buf.size());
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}
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} // namespace blender::timeit
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