fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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233 lines
9.1 KiB
233 lines
9.1 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "util/rate_limiter.h"
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#include <chrono>
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#include <cinttypes>
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#include <limits>
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#include "db/db_test_util.h"
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#include "rocksdb/env.h"
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#include "test_util/sync_point.h"
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#include "test_util/testharness.h"
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#include "util/random.h"
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namespace ROCKSDB_NAMESPACE {
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// TODO(yhchiang): the rate will not be accurate when we run test in parallel.
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class RateLimiterTest : public testing::Test {};
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TEST_F(RateLimiterTest, OverflowRate) {
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GenericRateLimiter limiter(port::kMaxInt64, 1000, 10,
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RateLimiter::Mode::kWritesOnly, Env::Default(),
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false /* auto_tuned */);
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ASSERT_GT(limiter.GetSingleBurstBytes(), 1000000000ll);
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}
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TEST_F(RateLimiterTest, StartStop) {
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std::unique_ptr<RateLimiter> limiter(NewGenericRateLimiter(100, 100, 10));
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}
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TEST_F(RateLimiterTest, Modes) {
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for (auto mode : {RateLimiter::Mode::kWritesOnly,
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RateLimiter::Mode::kReadsOnly, RateLimiter::Mode::kAllIo}) {
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GenericRateLimiter limiter(
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2000 /* rate_bytes_per_sec */, 1000 * 1000 /* refill_period_us */,
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10 /* fairness */, mode, Env::Default(), false /* auto_tuned */);
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limiter.Request(1000 /* bytes */, Env::IO_HIGH, nullptr /* stats */,
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RateLimiter::OpType::kRead);
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if (mode == RateLimiter::Mode::kWritesOnly) {
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ASSERT_EQ(0, limiter.GetTotalBytesThrough(Env::IO_HIGH));
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} else {
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ASSERT_EQ(1000, limiter.GetTotalBytesThrough(Env::IO_HIGH));
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}
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limiter.Request(1000 /* bytes */, Env::IO_HIGH, nullptr /* stats */,
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RateLimiter::OpType::kWrite);
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if (mode == RateLimiter::Mode::kAllIo) {
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ASSERT_EQ(2000, limiter.GetTotalBytesThrough(Env::IO_HIGH));
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} else {
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ASSERT_EQ(1000, limiter.GetTotalBytesThrough(Env::IO_HIGH));
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}
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}
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}
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#if !(defined(TRAVIS) && defined(OS_MACOSX))
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TEST_F(RateLimiterTest, Rate) {
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auto* env = Env::Default();
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struct Arg {
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Arg(int32_t _target_rate, int _burst)
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: limiter(NewGenericRateLimiter(_target_rate, 100 * 1000, 10)),
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request_size(_target_rate / 10),
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burst(_burst) {}
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std::unique_ptr<RateLimiter> limiter;
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int32_t request_size;
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int burst;
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};
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auto writer = [](void* p) {
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auto* thread_env = Env::Default();
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auto* arg = static_cast<Arg*>(p);
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// Test for 2 seconds
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auto until = thread_env->NowMicros() + 2 * 1000000;
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Random r((uint32_t)(thread_env->NowNanos() %
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std::numeric_limits<uint32_t>::max()));
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while (thread_env->NowMicros() < until) {
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for (int i = 0; i < static_cast<int>(r.Skewed(arg->burst) + 1); ++i) {
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arg->limiter->Request(r.Uniform(arg->request_size - 1) + 1,
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Env::IO_HIGH, nullptr /* stats */,
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RateLimiter::OpType::kWrite);
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}
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arg->limiter->Request(r.Uniform(arg->request_size - 1) + 1, Env::IO_LOW,
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nullptr /* stats */, RateLimiter::OpType::kWrite);
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}
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};
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for (int i = 1; i <= 16; i *= 2) {
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int32_t target = i * 1024 * 10;
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Arg arg(target, i / 4 + 1);
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int64_t old_total_bytes_through = 0;
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for (int iter = 1; iter <= 2; ++iter) {
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// second iteration changes the target dynamically
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if (iter == 2) {
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target *= 2;
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arg.limiter->SetBytesPerSecond(target);
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}
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auto start = env->NowMicros();
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for (int t = 0; t < i; ++t) {
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env->StartThread(writer, &arg);
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}
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env->WaitForJoin();
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auto elapsed = env->NowMicros() - start;
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double rate =
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(arg.limiter->GetTotalBytesThrough() - old_total_bytes_through) *
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1000000.0 / elapsed;
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old_total_bytes_through = arg.limiter->GetTotalBytesThrough();
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fprintf(stderr,
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"request size [1 - %" PRIi32 "], limit %" PRIi32
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" KB/sec, actual rate: %lf KB/sec, elapsed %.2lf seconds\n",
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arg.request_size - 1, target / 1024, rate / 1024,
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elapsed / 1000000.0);
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ASSERT_GE(rate / target, 0.80);
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ASSERT_LE(rate / target, 1.25);
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}
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}
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}
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#endif
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TEST_F(RateLimiterTest, LimitChangeTest) {
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// starvation test when limit changes to a smaller value
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int64_t refill_period = 1000 * 1000;
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auto* env = Env::Default();
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
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struct Arg {
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Arg(int32_t _request_size, Env::IOPriority _pri,
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std::shared_ptr<RateLimiter> _limiter)
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: request_size(_request_size), pri(_pri), limiter(_limiter) {}
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int32_t request_size;
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Env::IOPriority pri;
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std::shared_ptr<RateLimiter> limiter;
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};
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auto writer = [](void* p) {
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auto* arg = static_cast<Arg*>(p);
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arg->limiter->Request(arg->request_size, arg->pri, nullptr /* stats */,
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RateLimiter::OpType::kWrite);
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};
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for (uint32_t i = 1; i <= 16; i <<= 1) {
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int32_t target = i * 1024 * 10;
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// refill per second
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for (int iter = 0; iter < 2; iter++) {
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std::shared_ptr<RateLimiter> limiter =
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std::make_shared<GenericRateLimiter>(
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target, refill_period, 10, RateLimiter::Mode::kWritesOnly,
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Env::Default(), false /* auto_tuned */);
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency(
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{{"GenericRateLimiter::Request",
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"RateLimiterTest::LimitChangeTest:changeLimitStart"},
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{"RateLimiterTest::LimitChangeTest:changeLimitEnd",
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"GenericRateLimiter::Refill"}});
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Arg arg(target, Env::IO_HIGH, limiter);
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// The idea behind is to start a request first, then before it refills,
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// update limit to a different value (2X/0.5X). No starvation should
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// be guaranteed under any situation
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// TODO(lightmark): more test cases are welcome.
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env->StartThread(writer, &arg);
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int32_t new_limit = (target << 1) >> (iter << 1);
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TEST_SYNC_POINT("RateLimiterTest::LimitChangeTest:changeLimitStart");
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arg.limiter->SetBytesPerSecond(new_limit);
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TEST_SYNC_POINT("RateLimiterTest::LimitChangeTest:changeLimitEnd");
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env->WaitForJoin();
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fprintf(stderr,
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"[COMPLETE] request size %" PRIi32 " KB, new limit %" PRIi32
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"KB/sec, refill period %" PRIi64 " ms\n",
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target / 1024, new_limit / 1024, refill_period / 1000);
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}
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}
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}
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TEST_F(RateLimiterTest, AutoTuneIncreaseWhenFull) {
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const std::chrono::seconds kTimePerRefill(1);
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const int kRefillsPerTune = 100; // needs to match util/rate_limiter.cc
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SpecialEnv special_env(Env::Default(), /*time_elapse_only_sleep*/ true);
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auto stats = CreateDBStatistics();
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std::unique_ptr<RateLimiter> rate_limiter(new GenericRateLimiter(
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1000 /* rate_bytes_per_sec */,
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std::chrono::microseconds(kTimePerRefill).count(), 10 /* fairness */,
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RateLimiter::Mode::kWritesOnly, &special_env, true /* auto_tuned */));
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// Use callback to advance time because we need to advance (1) after Request()
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// has determined the bytes are not available; and (2) before Refill()
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// computes the next refill time (ensuring refill time in the future allows
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// the next request to drain the rate limiter).
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
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"GenericRateLimiter::Refill", [&](void* /*arg*/) {
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special_env.SleepForMicroseconds(static_cast<int>(
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std::chrono::microseconds(kTimePerRefill).count()));
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});
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
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// verify rate limit increases after a sequence of periods where rate limiter
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// is always drained
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int64_t orig_bytes_per_sec = rate_limiter->GetSingleBurstBytes();
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rate_limiter->Request(orig_bytes_per_sec, Env::IO_HIGH, stats.get(),
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RateLimiter::OpType::kWrite);
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while (std::chrono::microseconds(special_env.NowMicros()) <=
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kRefillsPerTune * kTimePerRefill) {
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rate_limiter->Request(orig_bytes_per_sec, Env::IO_HIGH, stats.get(),
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RateLimiter::OpType::kWrite);
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}
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int64_t new_bytes_per_sec = rate_limiter->GetSingleBurstBytes();
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ASSERT_GT(new_bytes_per_sec, orig_bytes_per_sec);
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
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// decreases after a sequence of periods where rate limiter is not drained
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orig_bytes_per_sec = new_bytes_per_sec;
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special_env.SleepForMicroseconds(static_cast<int>(
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kRefillsPerTune * std::chrono::microseconds(kTimePerRefill).count()));
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// make a request so tuner can be triggered
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rate_limiter->Request(1 /* bytes */, Env::IO_HIGH, stats.get(),
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RateLimiter::OpType::kWrite);
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new_bytes_per_sec = rate_limiter->GetSingleBurstBytes();
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ASSERT_LT(new_bytes_per_sec, orig_bytes_per_sec);
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}
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} // namespace ROCKSDB_NAMESPACE
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int main(int argc, char** argv) {
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::testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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