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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* 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:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 <gtest/gtest.h>
#include <hicn/transport/utils/event_thread.h>
#include <cmath>
namespace utils {
namespace {
class EventThreadTest : public ::testing::Test {
protected:
EventThreadTest() : event_thread_() {
// You can do set-up work for each test here.
}
virtual ~EventThreadTest() {
// You can do clean-up work that doesn't throw exceptions here.
}
// If the constructor and destructor are not enough for setting up
// and cleaning up each test, you can define the following methods:
virtual void SetUp() {
// Code here will be called immediately after the constructor (right
// before each test).
}
virtual void TearDown() {
// Code here will be called immediately after each test (right
// before the destructor).
}
utils::EventThread event_thread_;
};
double average(const unsigned long samples[], int size) {
double sum = 0;
for (int i = 0; i < size; i++) {
sum += samples[i];
}
return sum / size;
}
double stdDeviation(const unsigned long samples[], int size) {
double avg = average(samples, size);
double var = 0;
for (int i = 0; i < size; i++) {
var += (samples[i] - avg) * (samples[i] - avg);
}
return sqrt(var / size);
}
} // namespace
TEST_F(EventThreadTest, DISABLED_SchedulingDelay) {
using namespace std::chrono;
const size_t size = 1000000;
std::vector<unsigned long> samples(size);
for (unsigned int i = 0; i < size; i++) {
auto t0 = steady_clock::now();
event_thread_.add([t0, &samples, i]() {
auto t1 = steady_clock::now();
samples[i] = duration_cast<nanoseconds>(t1 - t0).count();
});
}
event_thread_.stop();
auto avg = average(&samples[0], size);
auto sd = stdDeviation(&samples[0], size);
(void)sd;
// Expect average to be less that 1 ms
EXPECT_LT(avg, 1000000);
}
} // namespace utils
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