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Siying Dong edcbb36944 Three code-level optimization to Iterator::Next() 
Summary:
Three small optimizations:
(1) iter_->IsKeyPinned() shouldn't be called if read_options.pin_data is not true. This may trigger function call all the way down the iterator tree.
(2) reuse the iterator key object in DBIter::FindNextUserEntryInternal(). The constructor of the class has some overheads.
(3) Move the switching direction logic in MergingIterator::Next() to a separate function.

These three in total improves readseq performance by about 3% in my benchmark setting.
Closes https://github.com/facebook/rocksdb/pull/2880

Differential Revision: D5829252

Pulled By: siying

fbshipit-source-id: 991aea10c6d6c3b43769cb4db168db62954ad1e3
2017-09-14 17:57:31 -07:00
..
adaptive_table_factory.cc
Support prefetch last 512KB with direct I/O in block based file reader
2017-08-11 12:16:45 -07:00
adaptive_table_factory.h
Revert "comment out unused parameters"
2017-07-21 18:26:26 -07:00
block_based_filter_block_test.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
block_based_filter_block.cc
Revert "comment out unused parameters"
2017-07-21 18:26:26 -07:00
block_based_filter_block.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
block_based_table_builder.cc
support disabling checksum in block-based table
2017-08-23 19:40:47 -07:00
block_based_table_builder.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
block_based_table_factory.cc
Replace dynamic_cast<>
2017-07-28 16:27:16 -07:00
block_based_table_factory.h
Replace dynamic_cast<>
2017-07-28 16:27:16 -07:00
block_based_table_reader.cc
fix clang bug in block-based table reader
2017-08-23 15:12:05 -07:00
block_based_table_reader.h
Extend pin_l0 to filter partitions
2017-08-23 07:56:08 -07:00
block_builder.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
block_builder.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
block_prefix_index.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
block_prefix_index.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
block_test.cc
Revert "comment out unused parameters"
2017-07-21 18:26:26 -07:00
block.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
block.h
table/block.h: change memset
2017-07-17 10:41:56 -07:00
bloom_block.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
bloom_block.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
cleanable_test.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
cuckoo_table_builder_test.cc
allow nullptr Slice only as sentinel
2017-08-23 10:56:06 -07:00
cuckoo_table_builder.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
cuckoo_table_builder.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
cuckoo_table_factory.cc
Revert "comment out unused parameters"
2017-07-21 18:26:26 -07:00
cuckoo_table_factory.h
Replace dynamic_cast<>
2017-07-28 16:27:16 -07:00
cuckoo_table_reader_test.cc
Revert "comment out unused parameters"
2017-07-21 18:26:26 -07:00
cuckoo_table_reader.cc
remove unnecessary internal_comparator param in newIterator
2017-07-27 14:30:42 -07:00
cuckoo_table_reader.h
remove unnecessary internal_comparator param in newIterator
2017-07-27 14:30:42 -07:00
filter_block.h
Extend pin_l0 to filter partitions
2017-08-23 07:56:08 -07:00
flush_block_policy.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
format.cc
support disabling checksum in block-based table
2017-08-23 19:40:47 -07:00
format.h
Support prefetch last 512KB with direct I/O in block based file reader
2017-08-11 12:16:45 -07:00
full_filter_bits_builder.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
full_filter_block_test.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
full_filter_block.cc
Revert "comment out unused parameters"
2017-07-21 18:26:26 -07:00
full_filter_block.h
Revert "comment out unused parameters"
2017-07-21 18:26:26 -07:00
get_context.cc
write-prepared txn: call IsInSnapshot
2017-09-11 09:14:48 -07:00
get_context.h
write-prepared txn: call IsInSnapshot
2017-09-11 09:14:48 -07:00
index_builder.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
index_builder.h
Revert "comment out unused parameters"
2017-07-21 18:26:26 -07:00
internal_iterator.h
Revert "comment out unused parameters"
2017-07-21 18:26:26 -07:00
iter_heap.h
Make InternalKeyComparator final and directly use it in merging iterator
2017-09-11 12:04:21 -07:00
iterator_wrapper.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
iterator.cc
Revert "comment out unused parameters"
2017-07-21 18:26:26 -07:00
merger_test.cc
Make InternalKeyComparator final and directly use it in merging iterator
2017-09-11 12:04:21 -07:00
merging_iterator.cc
Three code-level optimization to Iterator::Next()
2017-09-14 17:57:31 -07:00
merging_iterator.h
Make InternalKeyComparator final and directly use it in merging iterator
2017-09-11 12:04:21 -07:00
meta_blocks.cc
Support prefetch last 512KB with direct I/O in block based file reader
2017-08-11 12:16:45 -07:00
meta_blocks.h
Support prefetch last 512KB with direct I/O in block based file reader
2017-08-11 12:16:45 -07:00
mock_table.cc
remove unnecessary internal_comparator param in newIterator
2017-07-27 14:30:42 -07:00
mock_table.h
remove unnecessary internal_comparator param in newIterator
2017-07-27 14:30:42 -07:00
partitioned_filter_block_test.cc
Extend pin_l0 to filter partitions
2017-08-23 07:56:08 -07:00
partitioned_filter_block.cc
Extend pin_l0 to filter partitions
2017-08-23 07:56:08 -07:00
partitioned_filter_block.h
Extend pin_l0 to filter partitions
2017-08-23 07:56:08 -07:00
persistent_cache_helper.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
persistent_cache_helper.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
persistent_cache_options.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
plain_table_builder.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
plain_table_builder.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
plain_table_factory.cc
Replace dynamic_cast<>
2017-07-28 16:27:16 -07:00
plain_table_factory.h
Replace dynamic_cast<>
2017-07-28 16:27:16 -07:00
plain_table_index.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
plain_table_index.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
plain_table_key_coding.cc
Revert "comment out unused parameters"
2017-07-21 18:26:26 -07:00
plain_table_key_coding.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
plain_table_reader.cc
Support prefetch last 512KB with direct I/O in block based file reader
2017-08-11 12:16:45 -07:00
plain_table_reader.h
remove unnecessary internal_comparator param in newIterator
2017-07-27 14:30:42 -07:00
scoped_arena_iterator.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
sst_file_writer_collectors.h
Revert "comment out unused parameters"
2017-07-21 18:26:26 -07:00
sst_file_writer.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
table_builder.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
table_properties_internal.h
Change RocksDB License
2017-07-15 16:11:23 -07:00
table_properties.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
table_reader_bench.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
table_reader.h
add VerifyChecksum() to db.h
2017-08-09 15:58:13 -07:00
table_test.cc
Preload l0 index partitions
2017-08-18 10:56:20 -07:00
two_level_iterator.cc
Change RocksDB License
2017-07-15 16:11:23 -07:00
two_level_iterator.h
Change RocksDB License
2017-07-15 16:11:23 -07:00