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
153
154
155
|
#include <assert.h>
#include <atomic>
#include <iostream>
#include <mutex>
#include <random>
#include <stdio.h>
#include <string>
#include <thread>
#include "HalideBuffer.h"
#include "HalideRuntime.h"
#include "async_parallel.h"
std::atomic<uint64_t> last_update{0};
uint64_t sleeps;
struct last_call {
int loc, x, y, z;
last_call *next;
bool inited;
bool operator<(const last_call &rhs) const {
if (loc < rhs.loc) {
return true;
} else if (loc >= rhs.loc) {
return false;
}
if (x < rhs.x) {
return true;
} else if (x >= rhs.x) {
return false;
}
if (y < rhs.y) {
return true;
} else if (y >= rhs.y) {
return false;
}
if (z < rhs.z) {
return true;
} else if (z >= rhs.z) {
return false;
}
return this < &rhs;
}
};
std::mutex watchdog_state_mutex;
// Protects these variables
bool watchdog_done = false;
last_call *all_thread_lasts = nullptr;
// End mutexed state
thread_local last_call thread_last = {};
extern "C" int sleeper(void *user_context, int loc, int x, int y, int z, int v) {
last_update++;
thread_last.loc = loc;
thread_last.x = x;
thread_last.y = y;
thread_last.z = z;
if (!thread_last.inited) {
std::lock_guard<std::mutex> lock(watchdog_state_mutex);
thread_last.next = all_thread_lasts;
all_thread_lasts = &thread_last;
thread_last.inited = true;
}
if ((sleeps & ((1UL << (7 - loc)) | (8UL << (x + 1)))) == 0) {
std::this_thread::sleep_for(std::chrono::milliseconds(1));
}
return v;
}
void watchdog() {
int count = 0;
while (true) {
uint64_t prev = last_update;
std::this_thread::sleep_for(std::chrono::milliseconds(100));
if (prev == last_update) {
std::lock_guard<std::mutex> lock(watchdog_state_mutex);
if (watchdog_done) {
return;
}
if (count < 3) {
count++;
continue;
}
int thread_count = 0;
last_call *best = all_thread_lasts;
last_call *lc = all_thread_lasts;
while (lc != nullptr) {
if (*lc < *best) {
best = lc;
}
thread_count++;
lc = lc->next;
}
fflush(stdout);
fflush(stderr);
if (best == nullptr) {
std::cout << "Hung before any sleeps on any thread.\n";
} else {
std::cout << "Hung at loc " << best->loc << "(" << best->x << ", " << best->y << ", " << best->z << ") sleeps: " << sleeps << " threads: " << thread_count << "\n";
}
_Exit(1);
} else {
count = 0;
}
}
}
int main(int argc, char **argv) {
uint64_t start;
uint64_t count = 1;
if (argc > 1) {
start = std::stoull(argv[1]);
} else {
std::mt19937 rng(time(nullptr));
std::uniform_int_distribution<> dis(0, 65535);
start = dis(rng);
}
if (argc > 2) {
count = std::stoull(argv[1]);
}
std::thread watcher(watchdog);
while (count-- > 0) {
sleeps = start++;
Halide::Runtime::Buffer<int, 3> out(8, 8, 8);
async_parallel(/*user_context*/ nullptr, out);
}
{
std::lock_guard<std::mutex> lock(watchdog_state_mutex);
watchdog_done = true;
}
watcher.join();
std::cout << "Success!\n";
return 0;
}
|
