bd56719ff2
Summary: Closes https://github.com/facebook/rocksdb/pull/2589 Differential Revision: D5431502 Pulled By: siying fbshipit-source-id: 8ebf8c87883daa9daa54b2303d11ce01ab1f6f75
626 lines
17 KiB
C++
626 lines
17 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 "memtable/inlineskiplist.h"
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#include <set>
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#include <unordered_set>
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#include "rocksdb/env.h"
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#include "util/concurrent_arena.h"
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#include "util/hash.h"
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#include "util/random.h"
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#include "util/testharness.h"
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namespace rocksdb {
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// Our test skip list stores 8-byte unsigned integers
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typedef uint64_t Key;
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static const char* Encode(const uint64_t* key) {
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return reinterpret_cast<const char*>(key);
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}
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static Key Decode(const char* key) {
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Key rv;
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memcpy(&rv, key, sizeof(Key));
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return rv;
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}
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struct TestComparator {
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int operator()(const char* a, const char* b) const {
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if (Decode(a) < Decode(b)) {
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return -1;
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} else if (Decode(a) > Decode(b)) {
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return +1;
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} else {
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return 0;
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}
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}
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};
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typedef InlineSkipList<TestComparator> TestInlineSkipList;
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class InlineSkipTest : public testing::Test {
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public:
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void Insert(TestInlineSkipList* list, Key key) {
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char* buf = list->AllocateKey(sizeof(Key));
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memcpy(buf, &key, sizeof(Key));
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list->Insert(buf);
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keys_.insert(key);
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}
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void InsertWithHint(TestInlineSkipList* list, Key key, void** hint) {
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char* buf = list->AllocateKey(sizeof(Key));
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memcpy(buf, &key, sizeof(Key));
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list->InsertWithHint(buf, hint);
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keys_.insert(key);
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}
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void Validate(TestInlineSkipList* list) {
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// Check keys exist.
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for (Key key : keys_) {
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ASSERT_TRUE(list->Contains(Encode(&key)));
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}
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// Iterate over the list, make sure keys appears in order and no extra
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// keys exist.
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TestInlineSkipList::Iterator iter(list);
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ASSERT_FALSE(iter.Valid());
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Key zero = 0;
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iter.Seek(Encode(&zero));
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for (Key key : keys_) {
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ASSERT_TRUE(iter.Valid());
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ASSERT_EQ(key, Decode(iter.key()));
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iter.Next();
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}
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ASSERT_FALSE(iter.Valid());
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// Validate the list is well-formed.
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list->TEST_Validate();
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}
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private:
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std::set<Key> keys_;
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};
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TEST_F(InlineSkipTest, Empty) {
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Arena arena;
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TestComparator cmp;
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InlineSkipList<TestComparator> list(cmp, &arena);
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Key key = 10;
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ASSERT_TRUE(!list.Contains(Encode(&key)));
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InlineSkipList<TestComparator>::Iterator iter(&list);
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ASSERT_TRUE(!iter.Valid());
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iter.SeekToFirst();
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ASSERT_TRUE(!iter.Valid());
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key = 100;
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iter.Seek(Encode(&key));
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ASSERT_TRUE(!iter.Valid());
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iter.SeekForPrev(Encode(&key));
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ASSERT_TRUE(!iter.Valid());
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iter.SeekToLast();
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ASSERT_TRUE(!iter.Valid());
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}
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TEST_F(InlineSkipTest, InsertAndLookup) {
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const int N = 2000;
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const int R = 5000;
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Random rnd(1000);
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std::set<Key> keys;
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ConcurrentArena arena;
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TestComparator cmp;
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InlineSkipList<TestComparator> list(cmp, &arena);
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for (int i = 0; i < N; i++) {
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Key key = rnd.Next() % R;
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if (keys.insert(key).second) {
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char* buf = list.AllocateKey(sizeof(Key));
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memcpy(buf, &key, sizeof(Key));
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list.Insert(buf);
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}
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}
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for (Key i = 0; i < R; i++) {
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if (list.Contains(Encode(&i))) {
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ASSERT_EQ(keys.count(i), 1U);
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} else {
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ASSERT_EQ(keys.count(i), 0U);
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}
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}
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// Simple iterator tests
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{
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InlineSkipList<TestComparator>::Iterator iter(&list);
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ASSERT_TRUE(!iter.Valid());
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uint64_t zero = 0;
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iter.Seek(Encode(&zero));
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ASSERT_TRUE(iter.Valid());
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ASSERT_EQ(*(keys.begin()), Decode(iter.key()));
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uint64_t max_key = R - 1;
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iter.SeekForPrev(Encode(&max_key));
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ASSERT_TRUE(iter.Valid());
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ASSERT_EQ(*(keys.rbegin()), Decode(iter.key()));
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iter.SeekToFirst();
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ASSERT_TRUE(iter.Valid());
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ASSERT_EQ(*(keys.begin()), Decode(iter.key()));
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iter.SeekToLast();
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ASSERT_TRUE(iter.Valid());
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ASSERT_EQ(*(keys.rbegin()), Decode(iter.key()));
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}
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// Forward iteration test
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for (Key i = 0; i < R; i++) {
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InlineSkipList<TestComparator>::Iterator iter(&list);
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iter.Seek(Encode(&i));
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// Compare against model iterator
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std::set<Key>::iterator model_iter = keys.lower_bound(i);
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for (int j = 0; j < 3; j++) {
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if (model_iter == keys.end()) {
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ASSERT_TRUE(!iter.Valid());
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break;
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} else {
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ASSERT_TRUE(iter.Valid());
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ASSERT_EQ(*model_iter, Decode(iter.key()));
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++model_iter;
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iter.Next();
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}
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}
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}
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// Backward iteration test
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for (Key i = 0; i < R; i++) {
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InlineSkipList<TestComparator>::Iterator iter(&list);
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iter.SeekForPrev(Encode(&i));
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// Compare against model iterator
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std::set<Key>::iterator model_iter = keys.upper_bound(i);
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for (int j = 0; j < 3; j++) {
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if (model_iter == keys.begin()) {
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ASSERT_TRUE(!iter.Valid());
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break;
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} else {
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ASSERT_TRUE(iter.Valid());
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ASSERT_EQ(*--model_iter, Decode(iter.key()));
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iter.Prev();
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}
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}
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}
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}
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TEST_F(InlineSkipTest, InsertWithHint_Sequential) {
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const int N = 100000;
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Arena arena;
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TestComparator cmp;
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TestInlineSkipList list(cmp, &arena);
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void* hint = nullptr;
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for (int i = 0; i < N; i++) {
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Key key = i;
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InsertWithHint(&list, key, &hint);
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}
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Validate(&list);
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}
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TEST_F(InlineSkipTest, InsertWithHint_MultipleHints) {
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const int N = 100000;
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const int S = 100;
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Random rnd(534);
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Arena arena;
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TestComparator cmp;
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TestInlineSkipList list(cmp, &arena);
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void* hints[S];
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Key last_key[S];
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for (int i = 0; i < S; i++) {
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hints[i] = nullptr;
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last_key[i] = 0;
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}
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for (int i = 0; i < N; i++) {
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Key s = rnd.Uniform(S);
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Key key = (s << 32) + (++last_key[s]);
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InsertWithHint(&list, key, &hints[s]);
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}
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Validate(&list);
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}
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TEST_F(InlineSkipTest, InsertWithHint_MultipleHintsRandom) {
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const int N = 100000;
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const int S = 100;
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Random rnd(534);
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Arena arena;
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TestComparator cmp;
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TestInlineSkipList list(cmp, &arena);
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void* hints[S];
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for (int i = 0; i < S; i++) {
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hints[i] = nullptr;
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}
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for (int i = 0; i < N; i++) {
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Key s = rnd.Uniform(S);
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Key key = (s << 32) + rnd.Next();
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InsertWithHint(&list, key, &hints[s]);
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}
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Validate(&list);
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}
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TEST_F(InlineSkipTest, InsertWithHint_CompatibleWithInsertWithoutHint) {
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const int N = 100000;
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const int S1 = 100;
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const int S2 = 100;
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Random rnd(534);
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Arena arena;
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TestComparator cmp;
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TestInlineSkipList list(cmp, &arena);
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std::unordered_set<Key> used;
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Key with_hint[S1];
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Key without_hint[S2];
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void* hints[S1];
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for (int i = 0; i < S1; i++) {
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hints[i] = nullptr;
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while (true) {
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Key s = rnd.Next();
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if (used.insert(s).second) {
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with_hint[i] = s;
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break;
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}
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}
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}
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for (int i = 0; i < S2; i++) {
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while (true) {
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Key s = rnd.Next();
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if (used.insert(s).second) {
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without_hint[i] = s;
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break;
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}
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}
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}
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for (int i = 0; i < N; i++) {
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Key s = rnd.Uniform(S1 + S2);
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if (s < S1) {
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Key key = (with_hint[s] << 32) + rnd.Next();
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InsertWithHint(&list, key, &hints[s]);
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} else {
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Key key = (without_hint[s - S1] << 32) + rnd.Next();
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Insert(&list, key);
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}
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}
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Validate(&list);
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}
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// We want to make sure that with a single writer and multiple
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// concurrent readers (with no synchronization other than when a
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// reader's iterator is created), the reader always observes all the
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// data that was present in the skip list when the iterator was
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// constructor. Because insertions are happening concurrently, we may
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// also observe new values that were inserted since the iterator was
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// constructed, but we should never miss any values that were present
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// at iterator construction time.
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//
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// We generate multi-part keys:
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// <key,gen,hash>
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// where:
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// key is in range [0..K-1]
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// gen is a generation number for key
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// hash is hash(key,gen)
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//
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// The insertion code picks a random key, sets gen to be 1 + the last
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// generation number inserted for that key, and sets hash to Hash(key,gen).
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//
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// At the beginning of a read, we snapshot the last inserted
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// generation number for each key. We then iterate, including random
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// calls to Next() and Seek(). For every key we encounter, we
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// check that it is either expected given the initial snapshot or has
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// been concurrently added since the iterator started.
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class ConcurrentTest {
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public:
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static const uint32_t K = 8;
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private:
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static uint64_t key(Key key) { return (key >> 40); }
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static uint64_t gen(Key key) { return (key >> 8) & 0xffffffffu; }
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static uint64_t hash(Key key) { return key & 0xff; }
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static uint64_t HashNumbers(uint64_t k, uint64_t g) {
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uint64_t data[2] = {k, g};
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return Hash(reinterpret_cast<char*>(data), sizeof(data), 0);
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}
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static Key MakeKey(uint64_t k, uint64_t g) {
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assert(sizeof(Key) == sizeof(uint64_t));
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assert(k <= K); // We sometimes pass K to seek to the end of the skiplist
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assert(g <= 0xffffffffu);
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return ((k << 40) | (g << 8) | (HashNumbers(k, g) & 0xff));
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}
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static bool IsValidKey(Key k) {
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return hash(k) == (HashNumbers(key(k), gen(k)) & 0xff);
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}
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static Key RandomTarget(Random* rnd) {
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switch (rnd->Next() % 10) {
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case 0:
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// Seek to beginning
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return MakeKey(0, 0);
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case 1:
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// Seek to end
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return MakeKey(K, 0);
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default:
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// Seek to middle
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return MakeKey(rnd->Next() % K, 0);
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}
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}
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// Per-key generation
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struct State {
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std::atomic<int> generation[K];
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void Set(int k, int v) {
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generation[k].store(v, std::memory_order_release);
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}
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int Get(int k) { return generation[k].load(std::memory_order_acquire); }
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State() {
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for (unsigned int k = 0; k < K; k++) {
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Set(k, 0);
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}
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}
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};
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// Current state of the test
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State current_;
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ConcurrentArena arena_;
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// InlineSkipList is not protected by mu_. We just use a single writer
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// thread to modify it.
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InlineSkipList<TestComparator> list_;
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public:
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ConcurrentTest() : list_(TestComparator(), &arena_) {}
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// REQUIRES: No concurrent calls to WriteStep or ConcurrentWriteStep
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void WriteStep(Random* rnd) {
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const uint32_t k = rnd->Next() % K;
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const int g = current_.Get(k) + 1;
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const Key new_key = MakeKey(k, g);
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char* buf = list_.AllocateKey(sizeof(Key));
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memcpy(buf, &new_key, sizeof(Key));
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list_.Insert(buf);
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current_.Set(k, g);
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}
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// REQUIRES: No concurrent calls for the same k
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void ConcurrentWriteStep(uint32_t k) {
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const int g = current_.Get(k) + 1;
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const Key new_key = MakeKey(k, g);
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char* buf = list_.AllocateKey(sizeof(Key));
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memcpy(buf, &new_key, sizeof(Key));
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list_.InsertConcurrently(buf);
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ASSERT_EQ(g, current_.Get(k) + 1);
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current_.Set(k, g);
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}
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void ReadStep(Random* rnd) {
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// Remember the initial committed state of the skiplist.
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State initial_state;
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for (unsigned int k = 0; k < K; k++) {
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initial_state.Set(k, current_.Get(k));
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}
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Key pos = RandomTarget(rnd);
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InlineSkipList<TestComparator>::Iterator iter(&list_);
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iter.Seek(Encode(&pos));
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while (true) {
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Key current;
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if (!iter.Valid()) {
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current = MakeKey(K, 0);
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} else {
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current = Decode(iter.key());
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ASSERT_TRUE(IsValidKey(current)) << current;
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}
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ASSERT_LE(pos, current) << "should not go backwards";
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// Verify that everything in [pos,current) was not present in
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// initial_state.
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while (pos < current) {
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ASSERT_LT(key(pos), K) << pos;
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// Note that generation 0 is never inserted, so it is ok if
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// <*,0,*> is missing.
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ASSERT_TRUE((gen(pos) == 0U) ||
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(gen(pos) > static_cast<uint64_t>(initial_state.Get(
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static_cast<int>(key(pos))))))
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<< "key: " << key(pos) << "; gen: " << gen(pos)
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<< "; initgen: " << initial_state.Get(static_cast<int>(key(pos)));
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// Advance to next key in the valid key space
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if (key(pos) < key(current)) {
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pos = MakeKey(key(pos) + 1, 0);
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} else {
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pos = MakeKey(key(pos), gen(pos) + 1);
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}
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}
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if (!iter.Valid()) {
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break;
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}
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if (rnd->Next() % 2) {
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iter.Next();
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pos = MakeKey(key(pos), gen(pos) + 1);
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} else {
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Key new_target = RandomTarget(rnd);
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if (new_target > pos) {
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pos = new_target;
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iter.Seek(Encode(&new_target));
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}
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}
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}
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}
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};
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const uint32_t ConcurrentTest::K;
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// Simple test that does single-threaded testing of the ConcurrentTest
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// scaffolding.
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TEST_F(InlineSkipTest, ConcurrentReadWithoutThreads) {
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ConcurrentTest test;
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Random rnd(test::RandomSeed());
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for (int i = 0; i < 10000; i++) {
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test.ReadStep(&rnd);
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test.WriteStep(&rnd);
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}
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}
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TEST_F(InlineSkipTest, ConcurrentInsertWithoutThreads) {
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ConcurrentTest test;
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Random rnd(test::RandomSeed());
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for (int i = 0; i < 10000; i++) {
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test.ReadStep(&rnd);
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uint32_t base = rnd.Next();
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for (int j = 0; j < 4; ++j) {
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test.ConcurrentWriteStep((base + j) % ConcurrentTest::K);
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}
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}
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}
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class TestState {
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public:
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ConcurrentTest t_;
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int seed_;
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std::atomic<bool> quit_flag_;
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std::atomic<uint32_t> next_writer_;
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enum ReaderState { STARTING, RUNNING, DONE };
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explicit TestState(int s)
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: seed_(s),
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quit_flag_(false),
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state_(STARTING),
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pending_writers_(0),
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state_cv_(&mu_) {}
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void Wait(ReaderState s) {
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mu_.Lock();
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while (state_ != s) {
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state_cv_.Wait();
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}
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mu_.Unlock();
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}
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void Change(ReaderState s) {
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mu_.Lock();
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state_ = s;
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state_cv_.Signal();
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mu_.Unlock();
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}
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void AdjustPendingWriters(int delta) {
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mu_.Lock();
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pending_writers_ += delta;
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if (pending_writers_ == 0) {
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state_cv_.Signal();
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}
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mu_.Unlock();
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}
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void WaitForPendingWriters() {
|
|
mu_.Lock();
|
|
while (pending_writers_ != 0) {
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|
state_cv_.Wait();
|
|
}
|
|
mu_.Unlock();
|
|
}
|
|
|
|
private:
|
|
port::Mutex mu_;
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|
ReaderState state_;
|
|
int pending_writers_;
|
|
port::CondVar state_cv_;
|
|
};
|
|
|
|
static void ConcurrentReader(void* arg) {
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|
TestState* state = reinterpret_cast<TestState*>(arg);
|
|
Random rnd(state->seed_);
|
|
int64_t reads = 0;
|
|
state->Change(TestState::RUNNING);
|
|
while (!state->quit_flag_.load(std::memory_order_acquire)) {
|
|
state->t_.ReadStep(&rnd);
|
|
++reads;
|
|
}
|
|
state->Change(TestState::DONE);
|
|
}
|
|
|
|
static void ConcurrentWriter(void* arg) {
|
|
TestState* state = reinterpret_cast<TestState*>(arg);
|
|
uint32_t k = state->next_writer_++ % ConcurrentTest::K;
|
|
state->t_.ConcurrentWriteStep(k);
|
|
state->AdjustPendingWriters(-1);
|
|
}
|
|
|
|
static void RunConcurrentRead(int run) {
|
|
const int seed = test::RandomSeed() + (run * 100);
|
|
Random rnd(seed);
|
|
const int N = 1000;
|
|
const int kSize = 1000;
|
|
for (int i = 0; i < N; i++) {
|
|
if ((i % 100) == 0) {
|
|
fprintf(stderr, "Run %d of %d\n", i, N);
|
|
}
|
|
TestState state(seed + 1);
|
|
Env::Default()->Schedule(ConcurrentReader, &state);
|
|
state.Wait(TestState::RUNNING);
|
|
for (int k = 0; k < kSize; ++k) {
|
|
state.t_.WriteStep(&rnd);
|
|
}
|
|
state.quit_flag_.store(true, std::memory_order_release);
|
|
state.Wait(TestState::DONE);
|
|
}
|
|
}
|
|
|
|
static void RunConcurrentInsert(int run, int write_parallelism = 4) {
|
|
Env::Default()->SetBackgroundThreads(1 + write_parallelism,
|
|
Env::Priority::LOW);
|
|
const int seed = test::RandomSeed() + (run * 100);
|
|
Random rnd(seed);
|
|
const int N = 1000;
|
|
const int kSize = 1000;
|
|
for (int i = 0; i < N; i++) {
|
|
if ((i % 100) == 0) {
|
|
fprintf(stderr, "Run %d of %d\n", i, N);
|
|
}
|
|
TestState state(seed + 1);
|
|
Env::Default()->Schedule(ConcurrentReader, &state);
|
|
state.Wait(TestState::RUNNING);
|
|
for (int k = 0; k < kSize; k += write_parallelism) {
|
|
state.next_writer_ = rnd.Next();
|
|
state.AdjustPendingWriters(write_parallelism);
|
|
for (int p = 0; p < write_parallelism; ++p) {
|
|
Env::Default()->Schedule(ConcurrentWriter, &state);
|
|
}
|
|
state.WaitForPendingWriters();
|
|
}
|
|
state.quit_flag_.store(true, std::memory_order_release);
|
|
state.Wait(TestState::DONE);
|
|
}
|
|
}
|
|
|
|
TEST_F(InlineSkipTest, ConcurrentRead1) { RunConcurrentRead(1); }
|
|
TEST_F(InlineSkipTest, ConcurrentRead2) { RunConcurrentRead(2); }
|
|
TEST_F(InlineSkipTest, ConcurrentRead3) { RunConcurrentRead(3); }
|
|
TEST_F(InlineSkipTest, ConcurrentRead4) { RunConcurrentRead(4); }
|
|
TEST_F(InlineSkipTest, ConcurrentRead5) { RunConcurrentRead(5); }
|
|
TEST_F(InlineSkipTest, ConcurrentInsert1) { RunConcurrentInsert(1); }
|
|
TEST_F(InlineSkipTest, ConcurrentInsert2) { RunConcurrentInsert(2); }
|
|
TEST_F(InlineSkipTest, ConcurrentInsert3) { RunConcurrentInsert(3); }
|
|
|
|
} // namespace rocksdb
|
|
|
|
int main(int argc, char** argv) {
|
|
::testing::InitGoogleTest(&argc, argv);
|
|
return RUN_ALL_TESTS();
|
|
}
|