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Add PerfContext counters for index/filter block cache stats (#4540)

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Summary:
Add counters to track block cache index/filter hits and misses. We currently count aggregate hits and misses, which includes index/filter/data blocks.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4540

Differential Revision: D10459652

Pulled By: anand1976

fbshipit-source-id: 0c59eee7f12f5103dcb6686f0e7995babe63d425
This commit is contained in:
Anand Ananthabhotla 2018-12-07 15:04:20 -08:00 committed by Facebook Github Bot
parent 4048762cbe
commit 1b01d23be2
3 changed files with 16 additions and 0 deletions
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4
include/rocksdb/perf_context.h
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@ -60,6 +60,10 @@ struct PerfContext {
uint64_t block_read_count; // total number of block reads (with IO)
uint64_t block_read_byte; // total number of bytes from block reads
uint64_t block_read_time; // total nanos spent on block reads
uint64_t block_cache_index_hit_count; // total number of index block hits
uint64_t index_block_read_count; // total number of index block reads
uint64_t block_cache_filter_hit_count; // total number of filter block hits
uint64_t filter_block_read_count; // total number of filter block reads
uint64_t block_checksum_time; // total nanos spent on block checksum
uint64_t block_decompress_time; // total nanos spent on block decompression

8
monitoring/perf_context.cc
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@ -44,6 +44,10 @@ void PerfContext::Reset() {
block_read_count = 0;
block_read_byte = 0;
block_read_time = 0;
block_cache_index_hit_count = 0;
index_block_read_count = 0;
block_cache_filter_hit_count = 0;
filter_block_read_count = 0;
block_checksum_time = 0;
block_decompress_time = 0;
get_read_bytes = 0;
@ -152,6 +156,10 @@ std::string PerfContext::ToString(bool exclude_zero_counters) const {
PERF_CONTEXT_OUTPUT(block_read_count);
PERF_CONTEXT_OUTPUT(block_read_byte);
PERF_CONTEXT_OUTPUT(block_read_time);
PERF_CONTEXT_OUTPUT(block_cache_index_hit_count);
PERF_CONTEXT_OUTPUT(index_block_read_count);
PERF_CONTEXT_OUTPUT(block_cache_filter_hit_count);
PERF_CONTEXT_OUTPUT(filter_block_read_count);
PERF_CONTEXT_OUTPUT(block_checksum_time);
PERF_CONTEXT_OUTPUT(block_decompress_time);
PERF_CONTEXT_OUTPUT(get_read_bytes);

4
table/block_based_table_reader.cc
View File

@ -1617,6 +1617,7 @@ BlockBasedTable::CachableEntry<FilterBlockReader> BlockBasedTable::GetFilter(
FilterBlockReader* filter = nullptr;
if (cache_handle != nullptr) {
PERF_COUNTER_ADD(block_cache_filter_hit_count, 1);
filter = reinterpret_cast<FilterBlockReader*>(
block_cache->Value(cache_handle));
} else if (no_io) {
@ -1633,6 +1634,7 @@ BlockBasedTable::CachableEntry<FilterBlockReader> BlockBasedTable::GetFilter(
? Cache::Priority::HIGH
: Cache::Priority::LOW);
if (s.ok()) {
PERF_COUNTER_ADD(filter_block_read_count, 1);
if (get_context != nullptr) {
get_context->get_context_stats_.num_cache_add++;
get_context->get_context_stats_.num_cache_bytes_write += usage;
@ -1708,6 +1710,7 @@ InternalIteratorBase<BlockHandle>* BlockBasedTable::NewIndexIterator(
IndexReader* index_reader = nullptr;
if (cache_handle != nullptr) {
PERF_COUNTER_ADD(block_cache_index_hit_count, 1);
index_reader =
reinterpret_cast<IndexReader*>(block_cache->Value(cache_handle));
} else {
@ -1737,6 +1740,7 @@ InternalIteratorBase<BlockHandle>* BlockBasedTable::NewIndexIterator(
RecordTick(statistics, BLOCK_CACHE_ADD);
RecordTick(statistics, BLOCK_CACHE_BYTES_WRITE, charge);
}
PERF_COUNTER_ADD(index_block_read_count, 1);
RecordTick(statistics, BLOCK_CACHE_INDEX_ADD);
RecordTick(statistics, BLOCK_CACHE_INDEX_BYTES_INSERT, charge);
} else {