14e3f8cd9b
Summary: Context: After more discussion, a fix in https://github.com/facebook/rocksdb/issues/8938 might turn out to be too restrictive for the case where `GetTotalPendingRequests` might be invoked on RateLimiter classes that does not support the recently added API `RateLimiter::GetTotalPendingRequests` (https://github.com/facebook/rocksdb/issues/8890) due to the `assert(false)` in https://github.com/facebook/rocksdb/issues/8938. Furthermore, sentinel value like `-1` proposed in https://github.com/facebook/rocksdb/issues/8938 is easy to be ignored and unchecked. Therefore we decided to adopt `Status::NotSupported()`, which is also a convention of adding new API to public header in RocksDB. - Changed return value type of `RateLimiter::GetTotalPendingRequests` in related declaration/definition - Passed in pointer argument to hold the output instead of returning it as before - Adapted to the changes above in calling `RateLimiter::GetTotalPendingRequests` in test - Minor improvement to `TEST_F(RateLimiterTest, GetTotalPendingRequests)`: added failure message for assertion and replaced repetitive statements with a loop Pull Request resolved: https://github.com/facebook/rocksdb/pull/8950 Reviewed By: ajkr, pdillinger Differential Revision: D31128450 Pulled By: hx235 fbshipit-source-id: 282ac9c4f3dacaa0aec6d0a993161f77ad47a040
472 lines
19 KiB
C++
472 lines
19 KiB
C++
// 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 <cstdint>
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#include <limits>
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#include "db/db_test_util.h"
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#include "port/port.h"
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#include "rocksdb/system_clock.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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protected:
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~RateLimiterTest() override {
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SyncPoint::GetInstance()->DisableProcessing();
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SyncPoint::GetInstance()->ClearAllCallBacks();
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}
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};
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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,
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SystemClock::Default(), 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, GetTotalBytesThrough) {
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std::unique_ptr<RateLimiter> limiter(NewGenericRateLimiter(
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200 /* rate_bytes_per_sec */, 1000 * 1000 /* refill_period_us */,
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10 /* fairness */));
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for (int i = Env::IO_LOW; i <= Env::IO_TOTAL; ++i) {
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ASSERT_EQ(limiter->GetTotalBytesThrough(static_cast<Env::IOPriority>(i)),
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0);
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}
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std::int64_t request_byte = 200;
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std::int64_t request_byte_sum = 0;
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for (int i = Env::IO_LOW; i < Env::IO_TOTAL; ++i) {
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limiter->Request(request_byte, static_cast<Env::IOPriority>(i),
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nullptr /* stats */, RateLimiter::OpType::kWrite);
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request_byte_sum += request_byte;
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}
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for (int i = Env::IO_LOW; i < Env::IO_TOTAL; ++i) {
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EXPECT_EQ(limiter->GetTotalBytesThrough(static_cast<Env::IOPriority>(i)),
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request_byte)
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<< "Failed to track total_bytes_through_ correctly when IOPriority = "
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<< static_cast<Env::IOPriority>(i);
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}
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EXPECT_EQ(limiter->GetTotalBytesThrough(Env::IO_TOTAL), request_byte_sum)
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<< "Failed to track total_bytes_through_ correctly when IOPriority = "
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"Env::IO_TOTAL";
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}
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TEST_F(RateLimiterTest, GetTotalRequests) {
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std::unique_ptr<RateLimiter> limiter(NewGenericRateLimiter(
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200 /* rate_bytes_per_sec */, 1000 * 1000 /* refill_period_us */,
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10 /* fairness */));
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for (int i = Env::IO_LOW; i <= Env::IO_TOTAL; ++i) {
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ASSERT_EQ(limiter->GetTotalRequests(static_cast<Env::IOPriority>(i)), 0);
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}
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std::int64_t total_requests_sum = 0;
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for (int i = Env::IO_LOW; i < Env::IO_TOTAL; ++i) {
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limiter->Request(200, static_cast<Env::IOPriority>(i), nullptr /* stats */,
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RateLimiter::OpType::kWrite);
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total_requests_sum += 1;
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}
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for (int i = Env::IO_LOW; i < Env::IO_TOTAL; ++i) {
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EXPECT_EQ(limiter->GetTotalRequests(static_cast<Env::IOPriority>(i)), 1)
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<< "Failed to track total_requests_ correctly when IOPriority = "
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<< static_cast<Env::IOPriority>(i);
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}
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EXPECT_EQ(limiter->GetTotalRequests(Env::IO_TOTAL), total_requests_sum)
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<< "Failed to track total_requests_ correctly when IOPriority = "
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"Env::IO_TOTAL";
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}
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TEST_F(RateLimiterTest, GetTotalPendingRequests) {
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std::unique_ptr<RateLimiter> limiter(NewGenericRateLimiter(
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200 /* rate_bytes_per_sec */, 1000 * 1000 /* refill_period_us */,
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10 /* fairness */));
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int64_t total_pending_requests = 0;
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for (int i = Env::IO_LOW; i <= Env::IO_TOTAL; ++i) {
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ASSERT_OK(limiter->GetTotalPendingRequests(
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&total_pending_requests, static_cast<Env::IOPriority>(i)));
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ASSERT_EQ(total_pending_requests, 0);
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}
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// This is a variable for making sure the following callback is called
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// and the assertions in it are indeed excuted
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bool nonzero_pending_requests_verified = false;
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SyncPoint::GetInstance()->SetCallBack(
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"GenericRateLimiter::Request:PostEnqueueRequest", [&](void* arg) {
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port::Mutex* request_mutex = (port::Mutex*)arg;
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// We temporarily unlock the mutex so that the following
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// GetTotalPendingRequests() can acquire it
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request_mutex->Unlock();
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for (int i = Env::IO_LOW; i <= Env::IO_TOTAL; ++i) {
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EXPECT_OK(limiter->GetTotalPendingRequests(
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&total_pending_requests, static_cast<Env::IOPriority>(i)))
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<< "Failed to return total pending requests for priority level = "
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<< static_cast<Env::IOPriority>(i);
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if (i == Env::IO_USER || i == Env::IO_TOTAL) {
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EXPECT_EQ(total_pending_requests, 1)
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<< "Failed to correctly return total pending requests for "
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"priority level = "
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<< static_cast<Env::IOPriority>(i);
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} else {
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EXPECT_EQ(total_pending_requests, 0)
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<< "Failed to correctly return total pending requests for "
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"priority level = "
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<< static_cast<Env::IOPriority>(i);
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}
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}
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// We lock the mutex again so that the request thread can resume running
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// with the mutex locked
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request_mutex->Lock();
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nonzero_pending_requests_verified = true;
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});
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SyncPoint::GetInstance()->EnableProcessing();
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limiter->Request(200, Env::IO_USER, nullptr /* stats */,
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RateLimiter::OpType::kWrite);
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ASSERT_EQ(nonzero_pending_requests_verified, true);
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for (int i = Env::IO_LOW; i <= Env::IO_TOTAL; ++i) {
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EXPECT_OK(limiter->GetTotalPendingRequests(&total_pending_requests,
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static_cast<Env::IOPriority>(i)))
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<< "Failed to return total pending requests for priority level = "
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<< static_cast<Env::IOPriority>(i);
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EXPECT_EQ(total_pending_requests, 0)
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<< "Failed to correctly return total pending requests for priority "
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"level = "
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<< static_cast<Env::IOPriority>(i);
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}
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SyncPoint::GetInstance()->DisableProcessing();
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SyncPoint::GetInstance()->ClearCallBack(
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"GenericRateLimiter::Request:PostEnqueueRequest");
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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(2000 /* rate_bytes_per_sec */,
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1000 * 1000 /* refill_period_us */,
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10 /* fairness */, mode, SystemClock::Default(),
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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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TEST_F(RateLimiterTest, GeneratePriorityIterationOrder) {
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std::unique_ptr<RateLimiter> limiter(NewGenericRateLimiter(
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200 /* rate_bytes_per_sec */, 1000 * 1000 /* refill_period_us */,
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10 /* fairness */));
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bool possible_random_one_in_fairness_results_for_high_mid_pri[4][2] = {
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{false, false}, {false, true}, {true, false}, {true, true}};
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std::vector<Env::IOPriority> possible_priority_iteration_orders[4] = {
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{Env::IO_USER, Env::IO_HIGH, Env::IO_MID, Env::IO_LOW},
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{Env::IO_USER, Env::IO_HIGH, Env::IO_LOW, Env::IO_MID},
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{Env::IO_USER, Env::IO_MID, Env::IO_LOW, Env::IO_HIGH},
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{Env::IO_USER, Env::IO_LOW, Env::IO_MID, Env::IO_HIGH}};
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for (int i = 0; i < 4; ++i) {
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// These are variables for making sure the following callbacks are called
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// and the assertion in the last callback is indeed excuted
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bool high_pri_iterated_after_mid_low_pri_set = false;
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bool mid_pri_itereated_after_low_pri_set = false;
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bool pri_iteration_order_verified = false;
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SyncPoint::GetInstance()->SetCallBack(
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"GenericRateLimiter::GeneratePriorityIterationOrder::"
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"PostRandomOneInFairnessForHighPri",
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[&](void* arg) {
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bool* high_pri_iterated_after_mid_low_pri = (bool*)arg;
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*high_pri_iterated_after_mid_low_pri =
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possible_random_one_in_fairness_results_for_high_mid_pri[i][0];
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high_pri_iterated_after_mid_low_pri_set = true;
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});
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SyncPoint::GetInstance()->SetCallBack(
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"GenericRateLimiter::GeneratePriorityIterationOrder::"
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"PostRandomOneInFairnessForMidPri",
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[&](void* arg) {
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bool* mid_pri_itereated_after_low_pri = (bool*)arg;
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*mid_pri_itereated_after_low_pri =
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possible_random_one_in_fairness_results_for_high_mid_pri[i][1];
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mid_pri_itereated_after_low_pri_set = true;
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});
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SyncPoint::GetInstance()->SetCallBack(
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"GenericRateLimiter::GeneratePriorityIterationOrder::"
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"PreReturnPriIterationOrder",
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[&](void* arg) {
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std::vector<Env::IOPriority>* pri_iteration_order =
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(std::vector<Env::IOPriority>*)arg;
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EXPECT_EQ(*pri_iteration_order, possible_priority_iteration_orders[i])
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<< "Failed to generate priority iteration order correctly when "
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"high_pri_iterated_after_mid_low_pri = "
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<< possible_random_one_in_fairness_results_for_high_mid_pri[i][0]
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<< ", mid_pri_itereated_after_low_pri = "
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<< possible_random_one_in_fairness_results_for_high_mid_pri[i][1]
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<< std::endl;
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pri_iteration_order_verified = true;
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});
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SyncPoint::GetInstance()->EnableProcessing();
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limiter->Request(200 /* request max bytes to drain so that refill and order
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generation will be triggered every time
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GenericRateLimiter::Request() is called */
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,
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Env::IO_USER, nullptr /* stats */,
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RateLimiter::OpType::kWrite);
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ASSERT_EQ(high_pri_iterated_after_mid_low_pri_set, true);
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ASSERT_EQ(mid_pri_itereated_after_low_pri_set, true);
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ASSERT_EQ(pri_iteration_order_verified, true);
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SyncPoint::GetInstance()->DisableProcessing();
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SyncPoint::GetInstance()->ClearCallBack(
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"GenericRateLimiter::GeneratePriorityIterationOrder::"
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"PreReturnPriIterationOrder");
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SyncPoint::GetInstance()->ClearCallBack(
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"GenericRateLimiter::GeneratePriorityIterationOrder::"
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"PostRandomOneInFairnessForMidPri");
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SyncPoint::GetInstance()->ClearCallBack(
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"GenericRateLimiter::GeneratePriorityIterationOrder::"
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"PostRandomOneInFairnessForHighPri");
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}
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}
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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 /* rate_bytes_per_sec */,
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100 * 1000 /* refill_period_us */,
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10 /* fairness */)),
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request_size(_target_rate /
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10 /* refill period here is 1/10 second */),
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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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const auto& thread_clock = SystemClock::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_clock->NowMicros() + 2 * 1000000;
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Random r((uint32_t)(thread_clock->NowNanos() %
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std::numeric_limits<uint32_t>::max()));
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while (thread_clock->NowMicros() < until) {
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for (int i = 0; i < static_cast<int>(r.Skewed(arg->burst * 2) + 1); ++i) {
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arg->limiter->Request(r.Uniform(arg->request_size - 1) + 1,
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Env::IO_USER, nullptr /* stats */,
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RateLimiter::OpType::kWrite);
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}
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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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for (int i = 0; i < static_cast<int>(r.Skewed(arg->burst / 2 + 1) + 1);
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++i) {
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arg->limiter->Request(r.Uniform(arg->request_size - 1) + 1, Env::IO_MID,
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nullptr /* stats */, 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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int samples = 0;
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int samples_at_minimum = 0;
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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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++samples;
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if (rate / target >= 0.80) {
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++samples_at_minimum;
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}
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ASSERT_LE(rate / target, 1.25);
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}
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}
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// This can fail in heavily loaded CI environments
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bool skip_minimum_rate_check =
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#if (defined(TRAVIS) || defined(CIRCLECI)) && defined(OS_MACOSX)
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true;
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#else
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getenv("SANDCASTLE");
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#endif
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if (skip_minimum_rate_check) {
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fprintf(stderr, "Skipped minimum rate check (%d / %d passed)\n",
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samples_at_minimum, samples);
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} else {
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ASSERT_EQ(samples_at_minimum, samples);
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}
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}
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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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SystemClock::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::RefillBytesAndGrantRequests"}});
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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);
|
|
}
|
|
}
|
|
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
|
|
}
|
|
|
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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
|
|
|
|
SpecialEnv special_env(Env::Default(), /*time_elapse_only_sleep*/ true);
|
|
|
|
auto stats = CreateDBStatistics();
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|
std::unique_ptr<RateLimiter> rate_limiter(new GenericRateLimiter(
|
|
1000 /* rate_bytes_per_sec */,
|
|
std::chrono::microseconds(kTimePerRefill).count(), 10 /* fairness */,
|
|
RateLimiter::Mode::kWritesOnly, special_env.GetSystemClock(),
|
|
true /* auto_tuned */));
|
|
|
|
// Rate limiter uses `CondVar::TimedWait()`, which does not have access to the
|
|
// `Env` to advance its time according to the fake wait duration. The
|
|
// workaround is to install a callback that advance the `Env`'s mock time.
|
|
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
|
|
"GenericRateLimiter::Request:PostTimedWait", [&](void* arg) {
|
|
int64_t time_waited_us = *static_cast<int64_t*>(arg);
|
|
special_env.SleepForMicroseconds(static_cast<int>(time_waited_us));
|
|
});
|
|
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
|
|
|
|
// verify rate limit increases after a sequence of periods where rate limiter
|
|
// is always drained
|
|
int64_t orig_bytes_per_sec = rate_limiter->GetSingleBurstBytes();
|
|
rate_limiter->Request(orig_bytes_per_sec, Env::IO_HIGH, stats.get(),
|
|
RateLimiter::OpType::kWrite);
|
|
while (std::chrono::microseconds(special_env.NowMicros()) <=
|
|
kRefillsPerTune * kTimePerRefill) {
|
|
rate_limiter->Request(orig_bytes_per_sec, Env::IO_HIGH, stats.get(),
|
|
RateLimiter::OpType::kWrite);
|
|
}
|
|
int64_t new_bytes_per_sec = rate_limiter->GetSingleBurstBytes();
|
|
ASSERT_GT(new_bytes_per_sec, orig_bytes_per_sec);
|
|
|
|
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
|
|
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearCallBack(
|
|
"GenericRateLimiter::Request:PostTimedWait");
|
|
|
|
// decreases after a sequence of periods where rate limiter is not drained
|
|
orig_bytes_per_sec = new_bytes_per_sec;
|
|
special_env.SleepForMicroseconds(static_cast<int>(
|
|
kRefillsPerTune * std::chrono::microseconds(kTimePerRefill).count()));
|
|
// make a request so tuner can be triggered
|
|
rate_limiter->Request(1 /* bytes */, Env::IO_HIGH, stats.get(),
|
|
RateLimiter::OpType::kWrite);
|
|
new_bytes_per_sec = rate_limiter->GetSingleBurstBytes();
|
|
ASSERT_LT(new_bytes_per_sec, orig_bytes_per_sec);
|
|
}
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|
|
|
|
int main(int argc, char** argv) {
|
|
::testing::InitGoogleTest(&argc, argv);
|
|
return RUN_ALL_TESTS();
|
|
}
|