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4126bdc0e1
Summary: This PR adds SetBufferSize() to the WriteBufferManager object. This enables user code to adjust the global budget for write_buffers based upon other memory conditions such as growth in table reader memory as the dataset grows. The buffer_size_ member variable is now atomic to match design of other changeable size_t members within WriteBufferManager. This change is useful as is. However, this change is also essential if someone decides they wanted to enable db_write_buffer_size modifications through the DB::SetOptions() API, i.e. no waste taking this as is. Any format / spacing changes are due to clang-format as required by check-in automation. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7961 Reviewed By: ajkr Differential Revision: D26639075 Pulled By: akankshamahajan15 fbshipit-source-id: 0604348caf092d35f44e85715331dc920e5c1033
231 lines
8.4 KiB
C++
231 lines
8.4 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 "rocksdb/write_buffer_manager.h"
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#include "test_util/testharness.h"
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namespace ROCKSDB_NAMESPACE {
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class WriteBufferManagerTest : public testing::Test {};
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#ifndef ROCKSDB_LITE
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const size_t kSizeDummyEntry = 256 * 1024;
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TEST_F(WriteBufferManagerTest, ShouldFlush) {
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// A write buffer manager of size 10MB
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std::unique_ptr<WriteBufferManager> wbf(
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new WriteBufferManager(10 * 1024 * 1024));
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wbf->ReserveMem(8 * 1024 * 1024);
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ASSERT_FALSE(wbf->ShouldFlush());
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// 90% of the hard limit will hit the condition
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wbf->ReserveMem(1 * 1024 * 1024);
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ASSERT_TRUE(wbf->ShouldFlush());
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// Scheduling for freeing will release the condition
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wbf->ScheduleFreeMem(1 * 1024 * 1024);
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ASSERT_FALSE(wbf->ShouldFlush());
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wbf->ReserveMem(2 * 1024 * 1024);
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ASSERT_TRUE(wbf->ShouldFlush());
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wbf->ScheduleFreeMem(4 * 1024 * 1024);
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// 11MB total, 6MB mutable. hard limit still hit
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ASSERT_TRUE(wbf->ShouldFlush());
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wbf->ScheduleFreeMem(2 * 1024 * 1024);
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// 11MB total, 4MB mutable. hard limit stills but won't flush because more
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// than half data is already being flushed.
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ASSERT_FALSE(wbf->ShouldFlush());
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wbf->ReserveMem(4 * 1024 * 1024);
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// 15 MB total, 8MB mutable.
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ASSERT_TRUE(wbf->ShouldFlush());
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wbf->FreeMem(7 * 1024 * 1024);
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// 8MB total, 8MB mutable.
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ASSERT_FALSE(wbf->ShouldFlush());
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// change size: 8M limit, 7M mutable limit
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wbf->SetBufferSize(8 * 1024 * 1024);
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// 8MB total, 8MB mutable.
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ASSERT_TRUE(wbf->ShouldFlush());
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wbf->ScheduleFreeMem(2 * 1024 * 1024);
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// 8MB total, 6MB mutable.
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ASSERT_TRUE(wbf->ShouldFlush());
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wbf->FreeMem(2 * 1024 * 1024);
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// 6MB total, 6MB mutable.
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ASSERT_FALSE(wbf->ShouldFlush());
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wbf->ReserveMem(1 * 1024 * 1024);
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// 7MB total, 7MB mutable.
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ASSERT_FALSE(wbf->ShouldFlush());
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wbf->ReserveMem(1 * 1024 * 1024);
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// 8MB total, 8MB mutable.
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ASSERT_TRUE(wbf->ShouldFlush());
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wbf->ScheduleFreeMem(1 * 1024 * 1024);
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wbf->FreeMem(1 * 1024 * 1024);
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// 7MB total, 7MB mutable.
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ASSERT_FALSE(wbf->ShouldFlush());
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}
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TEST_F(WriteBufferManagerTest, CacheCost) {
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LRUCacheOptions co;
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// 1GB cache
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co.capacity = 1024 * 1024 * 1024;
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co.num_shard_bits = 4;
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co.metadata_charge_policy = kDontChargeCacheMetadata;
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std::shared_ptr<Cache> cache = NewLRUCache(co);
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// A write buffer manager of size 50MB
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std::unique_ptr<WriteBufferManager> wbf(
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new WriteBufferManager(50 * 1024 * 1024, cache));
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// Allocate 333KB will allocate 512KB
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wbf->ReserveMem(333 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 2 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 2 * 256 * 1024 + 10000);
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// 2 dummy entries are added for size 333 kb.
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 2 * kSizeDummyEntry);
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// Allocate another 512KB
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wbf->ReserveMem(512 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 4 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 4 * 256 * 1024 + 10000);
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// 2 more dummy entries are added for size 512.
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 4 * kSizeDummyEntry);
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// Allocate another 10MB
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wbf->ReserveMem(10 * 1024 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 11 * 1024 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 11 * 1024 * 1024 + 10000);
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// 40 more entries are added for size 10 * 1024 * 1024.
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 44 * kSizeDummyEntry);
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// Free 1MB will not cause any change in cache cost
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wbf->FreeMem(1024 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 11 * 1024 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 11 * 1024 * 1024 + 10000);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 44 * kSizeDummyEntry);
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ASSERT_FALSE(wbf->ShouldFlush());
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// Allocate another 41MB
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wbf->ReserveMem(41 * 1024 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 51 * 1024 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 51 * 1024 * 1024 + 10000);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 204 * kSizeDummyEntry);
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ASSERT_TRUE(wbf->ShouldFlush());
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ASSERT_TRUE(wbf->ShouldFlush());
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wbf->ScheduleFreeMem(20 * 1024 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 51 * 1024 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 51 * 1024 * 1024 + 10000);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 204 * kSizeDummyEntry);
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// Still need flush as the hard limit hits
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ASSERT_TRUE(wbf->ShouldFlush());
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// Free 20MB will releae 256KB from cache
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wbf->FreeMem(20 * 1024 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 51 * 1024 * 1024 - 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 51 * 1024 * 1024 - 256 * 1024 + 10000);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 203 * kSizeDummyEntry);
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ASSERT_FALSE(wbf->ShouldFlush());
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// Every free will release 256KB if still not hit 3/4
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wbf->FreeMem(16 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 51 * 1024 * 1024 - 2 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 51 * 1024 * 1024 - 2 * 256 * 1024 + 10000);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 202 * kSizeDummyEntry);
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wbf->FreeMem(16 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 51 * 1024 * 1024 - 3 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 51 * 1024 * 1024 - 3 * 256 * 1024 + 10000);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 201 * kSizeDummyEntry);
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// Reserve 512KB will not cause any change in cache cost
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wbf->ReserveMem(512 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 51 * 1024 * 1024 - 3 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 51 * 1024 * 1024 - 3 * 256 * 1024 + 10000);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 201 * kSizeDummyEntry);
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wbf->FreeMem(16 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 51 * 1024 * 1024 - 4 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 51 * 1024 * 1024 - 4 * 256 * 1024 + 10000);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 200 * kSizeDummyEntry);
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// Destory write buffer manger should free everything
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wbf.reset();
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ASSERT_LT(cache->GetPinnedUsage(), 1024 * 1024);
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}
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TEST_F(WriteBufferManagerTest, NoCapCacheCost) {
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// 1GB cache
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std::shared_ptr<Cache> cache = NewLRUCache(1024 * 1024 * 1024, 4);
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// A write buffer manager of size 256MB
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std::unique_ptr<WriteBufferManager> wbf(new WriteBufferManager(0, cache));
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// Allocate 1.5MB will allocate 2MB
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wbf->ReserveMem(10 * 1024 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 10 * 1024 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 10 * 1024 * 1024 + 10000);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 40 * kSizeDummyEntry);
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ASSERT_FALSE(wbf->ShouldFlush());
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wbf->FreeMem(9 * 1024 * 1024);
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for (int i = 0; i < 40; i++) {
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wbf->FreeMem(4 * 1024);
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}
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ASSERT_GE(cache->GetPinnedUsage(), 1024 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 1024 * 1024 + 10000);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 4 * kSizeDummyEntry);
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}
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TEST_F(WriteBufferManagerTest, CacheFull) {
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// 15MB cache size with strict capacity
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LRUCacheOptions lo;
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lo.capacity = 12 * 1024 * 1024;
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lo.num_shard_bits = 0;
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lo.strict_capacity_limit = true;
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std::shared_ptr<Cache> cache = NewLRUCache(lo);
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std::unique_ptr<WriteBufferManager> wbf(new WriteBufferManager(0, cache));
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wbf->ReserveMem(10 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 40 * kSizeDummyEntry);
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size_t prev_pinned = cache->GetPinnedUsage();
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ASSERT_GE(prev_pinned, 10 * 1024 * 1024);
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// Some insert will fail
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wbf->ReserveMem(10 * 1024 * 1024);
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ASSERT_LE(cache->GetPinnedUsage(), 12 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 80 * kSizeDummyEntry);
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// Increase capacity so next insert will succeed
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cache->SetCapacity(30 * 1024 * 1024);
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wbf->ReserveMem(10 * 1024 * 1024);
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ASSERT_GT(cache->GetPinnedUsage(), 20 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 120 * kSizeDummyEntry);
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// Gradually release 20 MB
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for (int i = 0; i < 40; i++) {
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wbf->FreeMem(512 * 1024);
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}
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ASSERT_GE(cache->GetPinnedUsage(), 10 * 1024 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 20 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 95 * kSizeDummyEntry);
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}
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#endif // ROCKSDB_LITE
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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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