rocksdb/util/rate_limiter_test.cc
Igor Canadi 51301b869f Enable dynamic changing of rate limiter's bytes_per_second
Summary: This feature is going to be useful for mongodb+rocksdb. I'll expose it through mongo's API.

Test Plan: added new unit test. also will run TSAN on the new unit test

Reviewers: meyering, sdong

Reviewed By: meyering, sdong

Subscribers: meyering, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D35307
2015-03-18 15:35:55 -07:00

96 lines
3.0 KiB
C++

// Copyright (c) 2014, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include <inttypes.h>
#include <limits>
#include "util/testharness.h"
#include "util/rate_limiter.h"
#include "util/random.h"
#include "rocksdb/env.h"
namespace rocksdb {
class RateLimiterTest : public testing::Test {};
TEST_F(RateLimiterTest, StartStop) {
std::unique_ptr<RateLimiter> limiter(new GenericRateLimiter(100, 100, 10));
}
TEST_F(RateLimiterTest, Rate) {
auto* env = Env::Default();
struct Arg {
Arg(int32_t _target_rate, int _burst)
: limiter(new GenericRateLimiter(_target_rate, 100 * 1000, 10)),
request_size(_target_rate / 10),
burst(_burst) {}
std::unique_ptr<RateLimiter> limiter;
int32_t request_size;
int burst;
};
auto writer = [](void* p) {
auto* thread_env = Env::Default();
auto* arg = static_cast<Arg*>(p);
// Test for 2 seconds
auto until = thread_env->NowMicros() + 2 * 1000000;
Random r((uint32_t)(thread_env->NowNanos() %
std::numeric_limits<uint32_t>::max()));
while (thread_env->NowMicros() < until) {
for (int i = 0; i < static_cast<int>(r.Skewed(arg->burst) + 1); ++i) {
arg->limiter->Request(r.Uniform(arg->request_size - 1) + 1,
Env::IO_HIGH);
}
arg->limiter->Request(r.Uniform(arg->request_size - 1) + 1, Env::IO_LOW);
}
};
for (int i = 1; i <= 16; i *= 2) {
int32_t target = i * 1024 * 10;
Arg arg(target, i / 4 + 1);
int64_t old_total_bytes_through = 0;
for (int iter = 1; iter <= 2; ++iter) {
// second iteration changes the target dynamically
if (iter == 2) {
target *= 2;
arg.limiter->SetBytesPerSecond(target);
}
auto start = env->NowMicros();
for (int t = 0; t < i; ++t) {
env->StartThread(writer, &arg);
}
env->WaitForJoin();
auto elapsed = env->NowMicros() - start;
double rate =
(arg.limiter->GetTotalBytesThrough() - old_total_bytes_through) *
1000000.0 / elapsed;
old_total_bytes_through = arg.limiter->GetTotalBytesThrough();
fprintf(stderr,
"request size [1 - %" PRIi32 "], limit %" PRIi32
" KB/sec, actual rate: %lf KB/sec, elapsed %.2lf seconds\n",
arg.request_size - 1, target / 1024, rate / 1024,
elapsed / 1000000.0);
ASSERT_GE(rate / target, 0.9);
ASSERT_LE(rate / target, 1.1);
}
}
}
} // namespace rocksdb
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}