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// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/profiling/internal/sample_recorder.h"
#include <atomic>
#include <random>
#include <vector>
#include "gmock/gmock.h"
#include "absl/base/thread_annotations.h"
#include "absl/synchronization/internal/thread_pool.h"
#include "absl/synchronization/mutex.h"
#include "absl/synchronization/notification.h"
#include "absl/time/time.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace profiling_internal {
namespace {
using ::absl::synchronization_internal::ThreadPool;
using ::testing::IsEmpty;
using ::testing::UnorderedElementsAre;
struct Info : public Sample<Info> {
public:
void PrepareForSampling(int64_t w) { weight = w; }
std::atomic<size_t> size;
absl::Time create_time;
};
std::vector<size_t> GetSizes(SampleRecorder<Info>* s) {
std::vector<size_t> res;
s->Iterate([&](const Info& info) {
res.push_back(info.size.load(std::memory_order_acquire));
});
return res;
}
std::vector<int64_t> GetWeights(SampleRecorder<Info>* s) {
std::vector<int64_t> res;
s->Iterate([&](const Info& info) { res.push_back(info.weight); });
return res;
}
Info* Register(SampleRecorder<Info>* s, int64_t weight, size_t size) {
auto* info = s->Register(weight);
assert(info != nullptr);
info->size.store(size);
return info;
}
TEST(SampleRecorderTest, Registration) {
SampleRecorder<Info> sampler;
auto* info1 = Register(&sampler, 31, 1);
EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(1));
EXPECT_THAT(GetWeights(&sampler), UnorderedElementsAre(31));
auto* info2 = Register(&sampler, 32, 2);
EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(1, 2));
info1->size.store(3);
EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(3, 2));
EXPECT_THAT(GetWeights(&sampler), UnorderedElementsAre(31, 32));
sampler.Unregister(info1);
sampler.Unregister(info2);
}
TEST(SampleRecorderTest, Unregistration) {
SampleRecorder<Info> sampler;
std::vector<Info*> infos;
for (size_t i = 0; i < 3; ++i) {
infos.push_back(Register(&sampler, 33 + i, i));
}
EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(0, 1, 2));
EXPECT_THAT(GetWeights(&sampler), UnorderedElementsAre(33, 34, 35));
sampler.Unregister(infos[1]);
EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(0, 2));
EXPECT_THAT(GetWeights(&sampler), UnorderedElementsAre(33, 35));
infos.push_back(Register(&sampler, 36, 3));
infos.push_back(Register(&sampler, 37, 4));
EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(0, 2, 3, 4));
EXPECT_THAT(GetWeights(&sampler), UnorderedElementsAre(33, 35, 36, 37));
sampler.Unregister(infos[3]);
EXPECT_THAT(GetSizes(&sampler), UnorderedElementsAre(0, 2, 4));
EXPECT_THAT(GetWeights(&sampler), UnorderedElementsAre(33, 35, 37));
sampler.Unregister(infos[0]);
sampler.Unregister(infos[2]);
sampler.Unregister(infos[4]);
EXPECT_THAT(GetSizes(&sampler), IsEmpty());
}
TEST(SampleRecorderTest, MultiThreaded) {
SampleRecorder<Info> sampler;
Notification stop;
ThreadPool pool(10);
for (int i = 0; i < 10; ++i) {
pool.Schedule([&sampler, &stop, i]() {
std::random_device rd;
std::mt19937 gen(rd());
std::vector<Info*> infoz;
while (!stop.HasBeenNotified()) {
if (infoz.empty()) {
infoz.push_back(sampler.Register(i));
}
switch (std::uniform_int_distribution<>(0, 2)(gen)) {
case 0: {
infoz.push_back(sampler.Register(i));
break;
}
case 1: {
size_t p =
std::uniform_int_distribution<>(0, infoz.size() - 1)(gen);
Info* info = infoz[p];
infoz[p] = infoz.back();
infoz.pop_back();
EXPECT_EQ(info->weight, i);
sampler.Unregister(info);
break;
}
case 2: {
absl::Duration oldest = absl::ZeroDuration();
sampler.Iterate([&](const Info& info) {
oldest = std::max(oldest, absl::Now() - info.create_time);
});
ASSERT_GE(oldest, absl::ZeroDuration());
break;
}
}
}
});
}
// The threads will hammer away. Give it a little bit of time for tsan to
// spot errors.
absl::SleepFor(absl::Seconds(3));
stop.Notify();
}
TEST(SampleRecorderTest, Callback) {
SampleRecorder<Info> sampler;
auto* info1 = Register(&sampler, 39, 1);
auto* info2 = Register(&sampler, 40, 2);
static const Info* expected;
auto callback = [](const Info& info) {
// We can't use `info` outside of this callback because the object will be
// disposed as soon as we return from here.
EXPECT_EQ(&info, expected);
};
// Set the callback.
EXPECT_EQ(sampler.SetDisposeCallback(callback), nullptr);
expected = info1;
sampler.Unregister(info1);
// Unset the callback.
EXPECT_EQ(callback, sampler.SetDisposeCallback(nullptr));
expected = nullptr; // no more calls.
sampler.Unregister(info2);
}
} // namespace
} // namespace profiling_internal
ABSL_NAMESPACE_END
} // namespace absl