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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
#include "io_dispatcher.h"
#include "actor_bootstrapped.h"
#include "hfunc.h"
#include <util/system/mutex.h>
#include <util/system/condvar.h>
#include <util/system/thread.h>
#include <map>
#include <list>
namespace NActors {
class TIoDispatcherActor : public TActorBootstrapped<TIoDispatcherActor> {
enum {
EvNotifyThreadStopped = EventSpaceBegin(TEvents::ES_PRIVATE),
};
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// IO task queue
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class TTask {
TInstant Timestamp;
std::function<void()> Callback;
public:
TTask(TInstant timestamp, TEvInvokeQuery *ev)
: Timestamp(timestamp)
, Callback(std::move(ev->Callback))
{}
void Execute() {
Callback();
}
TInstant GetTimestamp() const {
return Timestamp;
}
};
class TTaskQueue {
std::list<TTask> Tasks;
TMutex Mutex;
TCondVar CondVar;
size_t NumThreadsToStop = 0;
public:
void Enqueue(TInstant timestamp, TEvInvokeQuery *ev) {
std::list<TTask> list;
list.emplace_back(timestamp, ev);
with_lock (Mutex) {
Tasks.splice(Tasks.end(), std::move(list));
}
CondVar.Signal();
}
bool Dequeue(std::list<TTask>& list, bool *sendNotify) {
with_lock (Mutex) {
CondVar.Wait(Mutex, [&] { return NumThreadsToStop || !Tasks.empty(); });
if (NumThreadsToStop) {
*sendNotify = NumThreadsToStop != Max<size_t>();
if (*sendNotify) {
--NumThreadsToStop;
}
return false;
} else {
list.splice(list.end(), Tasks, Tasks.begin());
return true;
}
}
}
void Stop() {
with_lock (Mutex) {
NumThreadsToStop = Max<size_t>();
}
CondVar.BroadCast();
}
void StopOne() {
with_lock (Mutex) {
++NumThreadsToStop;
Y_VERIFY(NumThreadsToStop);
}
CondVar.Signal();
}
std::optional<TInstant> GetEarliestTaskTimestamp() {
with_lock (Mutex) {
return Tasks.empty() ? std::nullopt : std::make_optional(Tasks.front().GetTimestamp());
}
}
};
TTaskQueue TaskQueue;
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// IO dispatcher threads
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class TThread : public ISimpleThread {
TIoDispatcherActor& Actor;
TActorSystem* const ActorSystem;
public:
TThread(TIoDispatcherActor& actor, TActorSystem *actorSystem)
: Actor(actor)
, ActorSystem(actorSystem)
{
Start();
}
void *ThreadProc() override {
SetCurrentThreadName("kikimr IO");
for (;;) {
std::list<TTask> tasks;
bool sendNotify;
if (!Actor.TaskQueue.Dequeue(tasks, &sendNotify)) {
if (sendNotify) {
ActorSystem->Send(new IEventHandle(EvNotifyThreadStopped, 0, Actor.SelfId(), TActorId(),
nullptr, TThread::CurrentThreadId()));
}
break;
}
for (TTask& task : tasks) {
task.Execute();
++*Actor.TasksCompleted;
}
}
return nullptr;
}
};
static constexpr size_t MinThreadCount = 4;
static constexpr size_t MaxThreadCount = 64;
std::map<TThread::TId, std::unique_ptr<TThread>> Threads;
size_t NumRunningThreads = 0;
void StartThread() {
auto thread = std::make_unique<TThread>(*this, TlsActivationContext->ExecutorThread.ActorSystem);
const TThread::TId id = thread->Id();
Threads.emplace(id, std::move(thread));
*NumThreads = ++NumRunningThreads;
++*ThreadsStarted;
}
void StopThread() {
Y_VERIFY(Threads.size());
TaskQueue.StopOne();
*NumThreads = --NumRunningThreads;
++*ThreadsStopped;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Counters
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
NMonitoring::TDynamicCounters::TCounterPtr NumThreads;
NMonitoring::TDynamicCounters::TCounterPtr TasksAdded;
NMonitoring::TDynamicCounters::TCounterPtr TasksCompleted;
NMonitoring::TDynamicCounters::TCounterPtr ThreadsStarted;
NMonitoring::TDynamicCounters::TCounterPtr ThreadsStopped;
public:
TIoDispatcherActor(const NMonitoring::TDynamicCounterPtr& counters)
: NumThreads(counters->GetCounter("NumThreads"))
, TasksAdded(counters->GetCounter("TasksAdded", true))
, TasksCompleted(counters->GetCounter("TasksCompleted", true))
, ThreadsStarted(counters->GetCounter("ThreadsStarted", true))
, ThreadsStopped(counters->GetCounter("ThreadsStopped", true))
{}
~TIoDispatcherActor() override {
TaskQueue.Stop();
}
void Bootstrap() {
while (NumRunningThreads < MinThreadCount) {
StartThread();
}
HandleWakeup();
Become(&TThis::StateFunc);
}
void HandleThreadStopped(TAutoPtr<IEventHandle> ev) {
auto it = Threads.find(ev->Cookie);
Y_VERIFY(it != Threads.end());
it->second->Join();
Threads.erase(it);
}
void Handle(TEvInvokeQuery::TPtr ev) {
++*TasksAdded;
TaskQueue.Enqueue(TActivationContext::Now(), ev->Get());
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Thread usage counter logic
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
std::optional<TInstant> IdleTimestamp;
static constexpr TDuration ThreadStartTime = TDuration::MilliSeconds(500);
static constexpr TDuration ThreadStopTime = TDuration::MilliSeconds(500);
void HandleWakeup() {
const TInstant now = TActivationContext::Now();
std::optional<TInstant> earliest = TaskQueue.GetEarliestTaskTimestamp();
if (earliest) {
if (now >= *earliest + ThreadStartTime && NumRunningThreads < MaxThreadCount) {
StartThread();
}
IdleTimestamp.reset();
} else if (!IdleTimestamp) {
IdleTimestamp = now;
} else if (now >= *IdleTimestamp + ThreadStopTime) {
IdleTimestamp.reset();
if (NumRunningThreads > MinThreadCount) {
StopThread();
}
}
Schedule(TDuration::MilliSeconds(100), new TEvents::TEvWakeup);
}
STRICT_STFUNC(StateFunc, {
fFunc(EvNotifyThreadStopped, HandleThreadStopped);
hFunc(TEvInvokeQuery, Handle);
cFunc(TEvents::TSystem::Wakeup, HandleWakeup);
cFunc(TEvents::TSystem::Poison, PassAway);
})
};
IActor *CreateIoDispatcherActor(const NMonitoring::TDynamicCounterPtr& counters) {
return new TIoDispatcherActor(counters);
}
} // NActors
|
