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rocksdb/db/version_set_test.cc
Feng Zhu f697cad15c create compressed_levels_ in Version, allocate its space using arena. Make Version::Get, Version::FindFile faster 
Summary:
    Define CompressedFileMetaData that just contains fd, smallest_slice, largest_slice. Create compressed_levels_ in Version, the space is allocated using arena
    Thus increase the file meta data locality, speed up "Get" and "FindFile"

    benchmark with in-memory tmpfs, could have 4% improvement under "random read" and 2% improvement under "read while writing"

benchmark command:
./db_bench --db=/mnt/db/rocksdb --num_levels=6 --key_size=20 --prefix_size=20 --keys_per_prefix=0 --value_size=100 --block_size=4096 --cache_size=17179869184 --cache_numshardbits=6 --compression_type=none --compression_ratio=1 --min_level_to_compress=-1 --disable_seek_compaction=1 --hard_rate_limit=2 --write_buffer_size=134217728 --max_write_buffer_number=2 --level0_file_num_compaction_trigger=8 --target_file_size_base=33554432 --max_bytes_for_level_base=1073741824 --disable_wal=0 --sync=0 --disable_data_sync=1 --verify_checksum=1 --delete_obsolete_files_period_micros=314572800 --max_grandparent_overlap_factor=10 --max_background_compactions=4 --max_background_flushes=0 --level0_slowdown_writes_trigger=16 --level0_stop_writes_trigger=24 --statistics=0 --stats_per_interval=0 --stats_interval=1048576 --histogram=0 --use_plain_table=1 --open_files=-1 --mmap_read=1 --mmap_write=0 --memtablerep=prefix_hash --bloom_bits=10 --bloom_locality=1 --perf_level=0 --benchmarks=readwhilewriting,readwhilewriting,readwhilewriting --use_existing_db=1 --num=52428800 --threads=1 —writes_per_second=81920

Read Random:
From 1.8363 ms/op, improve to 1.7587 ms/op.
Read while writing:
From 2.985 ms/op, improve to 2.924 ms/op.

Test Plan:
    make all check

Reviewers: ljin, haobo, yhchiang, sdong

Reviewed By: sdong

Subscribers: dhruba, igor

Differential Revision: https://reviews.facebook.net/D19419
2014-07-09 22:14:39 -07:00

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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "db/version_set.h"
#include "util/logging.h"
#include "util/testharness.h"
#include "util/testutil.h"
namespace rocksdb {
class FindFileTest {
public:
std::vector<FileMetaData*> files_;
bool disjoint_sorted_files_;
FindFileTest() : disjoint_sorted_files_(true) { }
~FindFileTest() {
for (unsigned int i = 0; i < files_.size(); i++) {
delete files_[i];
}
}
void Add(const char* smallest, const char* largest,
SequenceNumber smallest_seq = 100,
SequenceNumber largest_seq = 100) {
FileMetaData* f = new FileMetaData;
f->fd = FileDescriptor(files_.size() + 1, 0, 0);
f->smallest = InternalKey(smallest, smallest_seq, kTypeValue);
f->largest = InternalKey(largest, largest_seq, kTypeValue);
files_.push_back(f);
}
int Find(const char* key) {
InternalKey target(key, 100, kTypeValue);
InternalKeyComparator cmp(BytewiseComparator());
return FindFile(cmp, files_, target.Encode());
}
};
TEST(FindFileTest, Empty) {
ASSERT_EQ(0, Find("foo"));
}
TEST(FindFileTest, Single) {
Add("p", "q");
ASSERT_EQ(0, Find("a"));
ASSERT_EQ(0, Find("p"));
ASSERT_EQ(0, Find("p1"));
ASSERT_EQ(0, Find("q"));
ASSERT_EQ(1, Find("q1"));
ASSERT_EQ(1, Find("z"));
}
TEST(FindFileTest, Multiple) {
Add("150", "200");
Add("200", "250");
Add("300", "350");
Add("400", "450");
ASSERT_EQ(0, Find("100"));
ASSERT_EQ(0, Find("150"));
ASSERT_EQ(0, Find("151"));
ASSERT_EQ(0, Find("199"));
ASSERT_EQ(0, Find("200"));
ASSERT_EQ(1, Find("201"));
ASSERT_EQ(1, Find("249"));
ASSERT_EQ(1, Find("250"));
ASSERT_EQ(2, Find("251"));
ASSERT_EQ(2, Find("299"));
ASSERT_EQ(2, Find("300"));
ASSERT_EQ(2, Find("349"));
ASSERT_EQ(2, Find("350"));
ASSERT_EQ(3, Find("351"));
ASSERT_EQ(3, Find("400"));
ASSERT_EQ(3, Find("450"));
ASSERT_EQ(4, Find("451"));
}
class FindLevelFileTest {
public:
FileLevel level_files_;
bool disjoint_sorted_files_;
Arena arena_;
FindLevelFileTest() : disjoint_sorted_files_(true) { }
~FindLevelFileTest() {
}
void LevelFileInit(size_t num = 0) {
char* mem = arena_.AllocateAligned(num * sizeof(FdWithKeyRange));
level_files_.files = new (mem)FdWithKeyRange[num];
level_files_.num_files = 0;
}
void Add(const char* smallest, const char* largest,
SequenceNumber smallest_seq = 100,
SequenceNumber largest_seq = 100) {
InternalKey smallest_key = InternalKey(smallest, smallest_seq, kTypeValue);
InternalKey largest_key = InternalKey(largest, largest_seq, kTypeValue);
Slice smallest_slice = smallest_key.Encode();
Slice largest_slice = largest_key.Encode();
char* mem = arena_.AllocateAligned(
smallest_slice.size() + largest_slice.size());
memcpy(mem, smallest_slice.data(), smallest_slice.size());
memcpy(mem + smallest_slice.size(), largest_slice.data(),
largest_slice.size());
// add compressd_level_
size_t num = level_files_.num_files;
auto& file = level_files_.files[num];
file.fd = FileDescriptor(num + 1, 0);
file.smallest_key = Slice(mem, smallest_slice.size());
file.largest_key = Slice(mem + smallest_slice.size(),
largest_slice.size());
level_files_.num_files++;
}
int Find(const char* key) {
InternalKey target(key, 100, kTypeValue);
InternalKeyComparator cmp(BytewiseComparator());
return FindFile(cmp, level_files_, target.Encode());
}
bool Overlaps(const char* smallest, const char* largest) {
InternalKeyComparator cmp(BytewiseComparator());
Slice s(smallest != nullptr ? smallest : "");
Slice l(largest != nullptr ? largest : "");
return SomeFileOverlapsRange(cmp, disjoint_sorted_files_, level_files_,
(smallest != nullptr ? &s : nullptr),
(largest != nullptr ? &l : nullptr));
}
};
TEST(FindLevelFileTest, LevelEmpty) {
LevelFileInit(0);
ASSERT_EQ(0, Find("foo"));
ASSERT_TRUE(! Overlaps("a", "z"));
ASSERT_TRUE(! Overlaps(nullptr, "z"));
ASSERT_TRUE(! Overlaps("a", nullptr));
ASSERT_TRUE(! Overlaps(nullptr, nullptr));
}
TEST(FindLevelFileTest, LevelSingle) {
LevelFileInit(1);
Add("p", "q");
ASSERT_EQ(0, Find("a"));
ASSERT_EQ(0, Find("p"));
ASSERT_EQ(0, Find("p1"));
ASSERT_EQ(0, Find("q"));
ASSERT_EQ(1, Find("q1"));
ASSERT_EQ(1, Find("z"));
ASSERT_TRUE(! Overlaps("a", "b"));
ASSERT_TRUE(! Overlaps("z1", "z2"));
ASSERT_TRUE(Overlaps("a", "p"));
ASSERT_TRUE(Overlaps("a", "q"));
ASSERT_TRUE(Overlaps("a", "z"));
ASSERT_TRUE(Overlaps("p", "p1"));
ASSERT_TRUE(Overlaps("p", "q"));
ASSERT_TRUE(Overlaps("p", "z"));
ASSERT_TRUE(Overlaps("p1", "p2"));
ASSERT_TRUE(Overlaps("p1", "z"));
ASSERT_TRUE(Overlaps("q", "q"));
ASSERT_TRUE(Overlaps("q", "q1"));
ASSERT_TRUE(! Overlaps(nullptr, "j"));
ASSERT_TRUE(! Overlaps("r", nullptr));
ASSERT_TRUE(Overlaps(nullptr, "p"));
ASSERT_TRUE(Overlaps(nullptr, "p1"));
ASSERT_TRUE(Overlaps("q", nullptr));
ASSERT_TRUE(Overlaps(nullptr, nullptr));
}
TEST(FindLevelFileTest, LevelMultiple) {
LevelFileInit(4);
Add("150", "200");
Add("200", "250");
Add("300", "350");
Add("400", "450");
ASSERT_EQ(0, Find("100"));
ASSERT_EQ(0, Find("150"));
ASSERT_EQ(0, Find("151"));
ASSERT_EQ(0, Find("199"));
ASSERT_EQ(0, Find("200"));
ASSERT_EQ(1, Find("201"));
ASSERT_EQ(1, Find("249"));
ASSERT_EQ(1, Find("250"));
ASSERT_EQ(2, Find("251"));
ASSERT_EQ(2, Find("299"));
ASSERT_EQ(2, Find("300"));
ASSERT_EQ(2, Find("349"));
ASSERT_EQ(2, Find("350"));
ASSERT_EQ(3, Find("351"));
ASSERT_EQ(3, Find("400"));
ASSERT_EQ(3, Find("450"));
ASSERT_EQ(4, Find("451"));
ASSERT_TRUE(! Overlaps("100", "149"));
ASSERT_TRUE(! Overlaps("251", "299"));
ASSERT_TRUE(! Overlaps("451", "500"));
ASSERT_TRUE(! Overlaps("351", "399"));
ASSERT_TRUE(Overlaps("100", "150"));
ASSERT_TRUE(Overlaps("100", "200"));
ASSERT_TRUE(Overlaps("100", "300"));
ASSERT_TRUE(Overlaps("100", "400"));
ASSERT_TRUE(Overlaps("100", "500"));
ASSERT_TRUE(Overlaps("375", "400"));
ASSERT_TRUE(Overlaps("450", "450"));
ASSERT_TRUE(Overlaps("450", "500"));
}
TEST(FindLevelFileTest, LevelMultipleNullBoundaries) {
LevelFileInit(4);
Add("150", "200");
Add("200", "250");
Add("300", "350");
Add("400", "450");
ASSERT_TRUE(! Overlaps(nullptr, "149"));
ASSERT_TRUE(! Overlaps("451", nullptr));
ASSERT_TRUE(Overlaps(nullptr, nullptr));
ASSERT_TRUE(Overlaps(nullptr, "150"));
ASSERT_TRUE(Overlaps(nullptr, "199"));
ASSERT_TRUE(Overlaps(nullptr, "200"));
ASSERT_TRUE(Overlaps(nullptr, "201"));
ASSERT_TRUE(Overlaps(nullptr, "400"));
ASSERT_TRUE(Overlaps(nullptr, "800"));
ASSERT_TRUE(Overlaps("100", nullptr));
ASSERT_TRUE(Overlaps("200", nullptr));
ASSERT_TRUE(Overlaps("449", nullptr));
ASSERT_TRUE(Overlaps("450", nullptr));
}
TEST(FindLevelFileTest, LevelOverlapSequenceChecks) {
LevelFileInit(1);
Add("200", "200", 5000, 3000);
ASSERT_TRUE(! Overlaps("199", "199"));
ASSERT_TRUE(! Overlaps("201", "300"));
ASSERT_TRUE(Overlaps("200", "200"));
ASSERT_TRUE(Overlaps("190", "200"));
ASSERT_TRUE(Overlaps("200", "210"));
}
TEST(FindLevelFileTest, LevelOverlappingFiles) {
LevelFileInit(2);
Add("150", "600");
Add("400", "500");
disjoint_sorted_files_ = false;
ASSERT_TRUE(! Overlaps("100", "149"));
ASSERT_TRUE(! Overlaps("601", "700"));
ASSERT_TRUE(Overlaps("100", "150"));
ASSERT_TRUE(Overlaps("100", "200"));
ASSERT_TRUE(Overlaps("100", "300"));
ASSERT_TRUE(Overlaps("100", "400"));
ASSERT_TRUE(Overlaps("100", "500"));
ASSERT_TRUE(Overlaps("375", "400"));
ASSERT_TRUE(Overlaps("450", "450"));
ASSERT_TRUE(Overlaps("450", "500"));
ASSERT_TRUE(Overlaps("450", "700"));
ASSERT_TRUE(Overlaps("600", "700"));
}
} // namespace rocksdb
int main(int argc, char** argv) {
return rocksdb::test::RunAllTests();
}
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