1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
| //===-- Timer.cpp -----------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Utility/Timer.h"
#include "lldb/Utility/Stream.h"
#include <algorithm>
#include <map>
#include <mutex>
#include <utility>
#include <vector>
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
using namespace lldb_private;
#define TIMER_INDENT_AMOUNT 2
namespace {
typedef std::vector<Timer *> TimerStack;
static std::atomic<Timer::Category *> g_categories;
} // end of anonymous namespace
std::atomic<bool> Timer::g_quiet(true);
std::atomic<unsigned> Timer::g_display_depth(0);
static std::mutex &GetFileMutex() {
static std::mutex *g_file_mutex_ptr = new std::mutex();
return *g_file_mutex_ptr;
}
static TimerStack &GetTimerStackForCurrentThread() {
static thread_local TimerStack g_stack;
return g_stack;
}
Timer::Category::Category(const char *cat) : m_name(cat) {
m_nanos.store(0, std::memory_order_release);
m_nanos_total.store(0, std::memory_order_release);
m_count.store(0, std::memory_order_release);
Category *expected = g_categories;
do {
m_next = expected;
} while (!g_categories.compare_exchange_weak(expected, this));
}
void Timer::SetQuiet(bool value) { g_quiet = value; }
Timer::Timer(Timer::Category &category, const char *format, ...)
: m_category(category), m_total_start(std::chrono::steady_clock::now()) {
TimerStack &stack = GetTimerStackForCurrentThread();
stack.push_back(this);
if (g_quiet && stack.size() <= g_display_depth) {
std::lock_guard<std::mutex> lock(GetFileMutex());
// Indent
::fprintf(stdout, "%*s", int(stack.size() - 1) * TIMER_INDENT_AMOUNT, "");
// Print formatted string
va_list args;
va_start(args, format);
::vfprintf(stdout, format, args);
va_end(args);
// Newline
::fprintf(stdout, "\n");
}
}
Timer::~Timer() {
using namespace std::chrono;
auto stop_time = steady_clock::now();
auto total_dur = stop_time - m_total_start;
auto timer_dur = total_dur - m_child_duration;
TimerStack &stack = GetTimerStackForCurrentThread();
if (g_quiet && stack.size() <= g_display_depth) {
std::lock_guard<std::mutex> lock(GetFileMutex());
::fprintf(stdout, "%*s%.9f sec (%.9f sec)\n",
int(stack.size() - 1) * TIMER_INDENT_AMOUNT, "",
duration<double>(total_dur).count(),
duration<double>(timer_dur).count());
}
assert(stack.back() == this);
stack.pop_back();
if (!stack.empty())
stack.back()->ChildDuration(total_dur);
// Keep total results for each category so we can dump results.
m_category.m_nanos += std::chrono::nanoseconds(timer_dur).count();
m_category.m_nanos_total += std::chrono::nanoseconds(total_dur).count();
m_category.m_count++;
}
void Timer::SetDisplayDepth(uint32_t depth) { g_display_depth = depth; }
/* binary function predicate:
* - returns whether a person is less than another person
*/
namespace {
struct Stats {
const char *name;
uint64_t nanos;
uint64_t nanos_total;
uint64_t count;
};
} // namespace
static bool CategoryMapIteratorSortCriterion(const Stats &lhs,
const Stats &rhs) {
return lhs.nanos > rhs.nanos;
}
void Timer::ResetCategoryTimes() {
for (Category *i = g_categories; i; i = i->m_next) {
i->m_nanos.store(0, std::memory_order_release);
i->m_nanos_total.store(0, std::memory_order_release);
i->m_count.store(0, std::memory_order_release);
}
}
void Timer::DumpCategoryTimes(Stream *s) {
std::vector<Stats> sorted;
for (Category *i = g_categories; i; i = i->m_next) {
uint64_t nanos = i->m_nanos.load(std::memory_order_acquire);
if (nanos) {
uint64_t nanos_total = i->m_nanos_total.load(std::memory_order_acquire);
uint64_t count = i->m_count.load(std::memory_order_acquire);
Stats stats{i->m_name, nanos, nanos_total, count};
sorted.push_back(stats);
}
}
if (sorted.empty())
return; // Later code will break without any elements.
// Sort by time
llvm::sort(sorted.begin(), sorted.end(), CategoryMapIteratorSortCriterion);
for (const auto &stats : sorted)
s->Printf("%.9f sec (total: %.3fs; child: %.3fs; count: %" PRIu64
") for %s\n",
stats.nanos / 1000000000., stats.nanos_total / 1000000000.,
(stats.nanos_total - stats.nanos) / 1000000000., stats.count,
stats.name);
}
|