fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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301 lines
12 KiB
301 lines
12 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 "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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constexpr std::size_t kMetaDataChargeOverhead = 10000;
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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, memory_used_ = 333KB
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wbf->ReserveMem(333 * 1024);
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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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ASSERT_GE(cache->GetPinnedUsage(), 2 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 2 * 256 * 1024 + kMetaDataChargeOverhead);
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// Allocate another 512KB, memory_used_ = 845KB
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wbf->ReserveMem(512 * 1024);
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// 2 more dummy entries are added for size 512 KB
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// since ceil((memory_used_ - dummy_entries_in_cache_usage) % kSizeDummyEntry)
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// = 2
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 4 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 4 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 4 * 256 * 1024 + kMetaDataChargeOverhead);
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// Allocate another 10MB, memory_used_ = 11085KB
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wbf->ReserveMem(10 * 1024 * 1024);
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// 40 more entries are added for size 10 * 1024 * 1024 KB
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 44 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 44 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 44 * 256 * 1024 + kMetaDataChargeOverhead);
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// Free 1MB, memory_used_ = 10061KB
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// It will not cause any change in cache cost
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// since memory_used_ > dummy_entries_in_cache_usage * (3/4)
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wbf->FreeMem(1 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 44 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 44 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 44 * 256 * 1024 + kMetaDataChargeOverhead);
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ASSERT_FALSE(wbf->ShouldFlush());
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// Allocate another 41MB, memory_used_ = 52045KB
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wbf->ReserveMem(41 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 204 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 204 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(),
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204 * 256 * 1024 + kMetaDataChargeOverhead);
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ASSERT_TRUE(wbf->ShouldFlush());
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ASSERT_TRUE(wbf->ShouldFlush());
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// Schedule free 20MB, memory_used_ = 52045KB
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// It will not cause any change in memory_used and cache cost
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wbf->ScheduleFreeMem(20 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 204 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 204 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(),
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204 * 256 * 1024 + kMetaDataChargeOverhead);
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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, memory_used_ = 31565KB
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// It will releae 80 dummy entries from cache since
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// since memory_used_ < dummy_entries_in_cache_usage * (3/4)
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// and floor((dummy_entries_in_cache_usage - memory_used_) % kSizeDummyEntry)
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// = 80
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wbf->FreeMem(20 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 124 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 124 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(),
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124 * 256 * 1024 + kMetaDataChargeOverhead);
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ASSERT_FALSE(wbf->ShouldFlush());
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// Free 16KB, memory_used_ = 31549KB
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// It will not release any dummy entry since memory_used_ >=
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// dummy_entries_in_cache_usage * (3/4)
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wbf->FreeMem(16 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 124 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 124 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(),
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124 * 256 * 1024 + kMetaDataChargeOverhead);
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// Free 20MB, memory_used_ = 11069KB
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// It will releae 80 dummy entries from cache
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// since memory_used_ < dummy_entries_in_cache_usage * (3/4)
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// and floor((dummy_entries_in_cache_usage - memory_used_) % kSizeDummyEntry)
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// = 80
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wbf->FreeMem(20 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 44 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 44 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 44 * 256 * 1024 + kMetaDataChargeOverhead);
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// Free 1MB, memory_used_ = 10045KB
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// It will not cause any change in cache cost
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// since memory_used_ > dummy_entries_in_cache_usage * (3/4)
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wbf->FreeMem(1 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 44 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 44 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 44 * 256 * 1024 + kMetaDataChargeOverhead);
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// Reserve 512KB, memory_used_ = 10557KB
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// It will not casue any change in cache cost
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// since memory_used_ > dummy_entries_in_cache_usage * (3/4)
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// which reflects the benefit of saving dummy entry insertion on memory
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// reservation after delay decrease
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wbf->ReserveMem(512 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 44 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 44 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 44 * 256 * 1024 + kMetaDataChargeOverhead);
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// Destory write buffer manger should free everything
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wbf.reset();
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ASSERT_EQ(cache->GetPinnedUsage(), 0);
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}
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TEST_F(WriteBufferManagerTest, NoCapCacheCost) {
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constexpr std::size_t kMetaDataChargeOverhead = 10000;
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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 10MB, memory_used_ = 10240KB
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// It will allocate 40 dummy entries
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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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ASSERT_GE(cache->GetPinnedUsage(), 40 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 40 * 256 * 1024 + kMetaDataChargeOverhead);
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ASSERT_FALSE(wbf->ShouldFlush());
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// Free 9MB, memory_used_ = 1024KB
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// It will free 36 dummy entries
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wbf->FreeMem(9 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 4 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 4 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 4 * 256 * 1024 + kMetaDataChargeOverhead);
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// Free 160KB gradually, memory_used_ = 864KB
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// It will not cause any change
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// since memory_used_ > dummy_entries_in_cache_usage * 3/4
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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_EQ(wbf->dummy_entries_in_cache_usage(), 4 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 4 * 256 * 1024);
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ASSERT_LT(cache->GetPinnedUsage(), 4 * 256 * 1024 + kMetaDataChargeOverhead);
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}
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TEST_F(WriteBufferManagerTest, CacheFull) {
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constexpr std::size_t kMetaDataChargeOverhead = 20000;
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// 12MB 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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// Allocate 10MB, memory_used_ = 10240KB
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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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ASSERT_GE(cache->GetPinnedUsage(), 40 * kSizeDummyEntry);
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ASSERT_LT(cache->GetPinnedUsage(),
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40 * kSizeDummyEntry + kMetaDataChargeOverhead);
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// Allocate 10MB, memory_used_ = 20480KB
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// Some dummy entry insertion will fail due to full cache
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wbf->ReserveMem(10 * 1024 * 1024);
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ASSERT_GE(cache->GetPinnedUsage(), 40 * kSizeDummyEntry);
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ASSERT_LE(cache->GetPinnedUsage(), 12 * 1024 * 1024);
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ASSERT_LT(wbf->dummy_entries_in_cache_usage(), 80 * kSizeDummyEntry);
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// Free 15MB after encoutering cache full, memory_used_ = 5120KB
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wbf->FreeMem(15 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 20 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 20 * kSizeDummyEntry);
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ASSERT_LT(cache->GetPinnedUsage(),
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20 * kSizeDummyEntry + kMetaDataChargeOverhead);
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// Reserve 15MB, creating cache full again, memory_used_ = 20480KB
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wbf->ReserveMem(15 * 1024 * 1024);
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ASSERT_LE(cache->GetPinnedUsage(), 12 * 1024 * 1024);
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ASSERT_LT(wbf->dummy_entries_in_cache_usage(), 80 * kSizeDummyEntry);
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// Increase capacity so next insert will fully succeed
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cache->SetCapacity(40 * 1024 * 1024);
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// Allocate 10MB, memory_used_ = 30720KB
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wbf->ReserveMem(10 * 1024 * 1024);
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ASSERT_EQ(wbf->dummy_entries_in_cache_usage(), 120 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 120 * kSizeDummyEntry);
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ASSERT_LT(cache->GetPinnedUsage(),
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120 * kSizeDummyEntry + kMetaDataChargeOverhead);
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// Gradually release 20 MB
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// It ended up sequentially releasing 32, 24, 18 dummy entries when
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// memory_used_ decreases to 22528KB, 16384KB, 11776KB.
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// In total, it releases 74 dummy entries
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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_EQ(wbf->dummy_entries_in_cache_usage(), 46 * kSizeDummyEntry);
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ASSERT_GE(cache->GetPinnedUsage(), 46 * kSizeDummyEntry);
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ASSERT_LT(cache->GetPinnedUsage(),
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46 * kSizeDummyEntry + kMetaDataChargeOverhead);
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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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