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rocksdb/monitoring/statistics.cc
Peter Dillinger 249eff0f30 Stats for redundant insertions into block cache (#6681) 
Summary:
Since read threads do not coordinate on loading data into block
cache, two threads between Lookup and Insert can end up loading and
inserting the same data. This is particularly concerning with
cache_index_and_filter_blocks since those are hot and more likely to
be race targets if ejected from (or not pre-populated in) the cache.

Particularly with moves toward disaggregated / network storage, the cost
of redundant retrieval might be high, and we should at least have some
hard statistics from which we can estimate impact.

Example with full filter thrashing "cliff":

    $ ./db_bench --benchmarks=fillrandom --num=15000000 --cache_index_and_filter_blocks -bloom_bits=10
    ...
    $ ./db_bench --db=/tmp/rocksdbtest-172704/dbbench --use_existing_db --benchmarks=readrandom,stats --num=200000 --cache_index_and_filter_blocks --cache_size=$((130 * 1024 * 1024)) --bloom_bits=10 --threads=16 -statistics 2>&1 | egrep '^rocksdb.block.cache.(.*add|.*redundant)' | grep -v compress | sort
    rocksdb.block.cache.add COUNT : 14181
    rocksdb.block.cache.add.failures COUNT : 0
    rocksdb.block.cache.add.redundant COUNT : 476
    rocksdb.block.cache.data.add COUNT : 12749
    rocksdb.block.cache.data.add.redundant COUNT : 18
    rocksdb.block.cache.filter.add COUNT : 1003
    rocksdb.block.cache.filter.add.redundant COUNT : 217
    rocksdb.block.cache.index.add COUNT : 429
    rocksdb.block.cache.index.add.redundant COUNT : 241
    $ ./db_bench --db=/tmp/rocksdbtest-172704/dbbench --use_existing_db --benchmarks=readrandom,stats --num=200000 --cache_index_and_filter_blocks --cache_size=$((120 * 1024 * 1024)) --bloom_bits=10 --threads=16 -statistics 2>&1 | egrep '^rocksdb.block.cache.(.*add|.*redundant)' | grep -v compress | sort
    rocksdb.block.cache.add COUNT : 1182223
    rocksdb.block.cache.add.failures COUNT : 0
    rocksdb.block.cache.add.redundant COUNT : 302728
    rocksdb.block.cache.data.add COUNT : 31425
    rocksdb.block.cache.data.add.redundant COUNT : 12
    rocksdb.block.cache.filter.add COUNT : 795455
    rocksdb.block.cache.filter.add.redundant COUNT : 130238
    rocksdb.block.cache.index.add COUNT : 355343
    rocksdb.block.cache.index.add.redundant COUNT : 172478
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6681

Test Plan: Some manual testing (above) and unit test covering key metrics is included

Reviewed By: ltamasi

Differential Revision: D21134113

Pulled By: pdillinger

fbshipit-source-id: c11497b5f00f4ffdfe919823904e52d0a1a91d87
2020-04-27 13:20:27 -07:00

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
#include "monitoring/statistics.h"
#include <algorithm>
#include <cinttypes>
#include <cstdio>
#include "port/likely.h"
#include "rocksdb/statistics.h"
namespace ROCKSDB_NAMESPACE {
// The order of items listed in Tickers should be the same as
// the order listed in TickersNameMap
const std::vector<std::pair<Tickers, std::string>> TickersNameMap = {
{BLOCK_CACHE_MISS, "rocksdb.block.cache.miss"},
{BLOCK_CACHE_HIT, "rocksdb.block.cache.hit"},
{BLOCK_CACHE_ADD, "rocksdb.block.cache.add"},
{BLOCK_CACHE_ADD_FAILURES, "rocksdb.block.cache.add.failures"},
{BLOCK_CACHE_INDEX_MISS, "rocksdb.block.cache.index.miss"},
{BLOCK_CACHE_INDEX_HIT, "rocksdb.block.cache.index.hit"},
{BLOCK_CACHE_INDEX_ADD, "rocksdb.block.cache.index.add"},
{BLOCK_CACHE_INDEX_BYTES_INSERT, "rocksdb.block.cache.index.bytes.insert"},
{BLOCK_CACHE_INDEX_BYTES_EVICT, "rocksdb.block.cache.index.bytes.evict"},
{BLOCK_CACHE_FILTER_MISS, "rocksdb.block.cache.filter.miss"},
{BLOCK_CACHE_FILTER_HIT, "rocksdb.block.cache.filter.hit"},
{BLOCK_CACHE_FILTER_ADD, "rocksdb.block.cache.filter.add"},
{BLOCK_CACHE_FILTER_BYTES_INSERT,
"rocksdb.block.cache.filter.bytes.insert"},
{BLOCK_CACHE_FILTER_BYTES_EVICT, "rocksdb.block.cache.filter.bytes.evict"},
{BLOCK_CACHE_DATA_MISS, "rocksdb.block.cache.data.miss"},
{BLOCK_CACHE_DATA_HIT, "rocksdb.block.cache.data.hit"},
{BLOCK_CACHE_DATA_ADD, "rocksdb.block.cache.data.add"},
{BLOCK_CACHE_DATA_BYTES_INSERT, "rocksdb.block.cache.data.bytes.insert"},
{BLOCK_CACHE_BYTES_READ, "rocksdb.block.cache.bytes.read"},
{BLOCK_CACHE_BYTES_WRITE, "rocksdb.block.cache.bytes.write"},
{BLOOM_FILTER_USEFUL, "rocksdb.bloom.filter.useful"},
{BLOOM_FILTER_FULL_POSITIVE, "rocksdb.bloom.filter.full.positive"},
{BLOOM_FILTER_FULL_TRUE_POSITIVE,
"rocksdb.bloom.filter.full.true.positive"},
{BLOOM_FILTER_MICROS, "rocksdb.bloom.filter.micros"},
{PERSISTENT_CACHE_HIT, "rocksdb.persistent.cache.hit"},
{PERSISTENT_CACHE_MISS, "rocksdb.persistent.cache.miss"},
{SIM_BLOCK_CACHE_HIT, "rocksdb.sim.block.cache.hit"},
{SIM_BLOCK_CACHE_MISS, "rocksdb.sim.block.cache.miss"},
{MEMTABLE_HIT, "rocksdb.memtable.hit"},
{MEMTABLE_MISS, "rocksdb.memtable.miss"},
{GET_HIT_L0, "rocksdb.l0.hit"},
{GET_HIT_L1, "rocksdb.l1.hit"},
{GET_HIT_L2_AND_UP, "rocksdb.l2andup.hit"},
{COMPACTION_KEY_DROP_NEWER_ENTRY, "rocksdb.compaction.key.drop.new"},
{COMPACTION_KEY_DROP_OBSOLETE, "rocksdb.compaction.key.drop.obsolete"},
{COMPACTION_KEY_DROP_RANGE_DEL, "rocksdb.compaction.key.drop.range_del"},
{COMPACTION_KEY_DROP_USER, "rocksdb.compaction.key.drop.user"},
{COMPACTION_RANGE_DEL_DROP_OBSOLETE,
"rocksdb.compaction.range_del.drop.obsolete"},
{COMPACTION_OPTIMIZED_DEL_DROP_OBSOLETE,
"rocksdb.compaction.optimized.del.drop.obsolete"},
{COMPACTION_CANCELLED, "rocksdb.compaction.cancelled"},
{NUMBER_KEYS_WRITTEN, "rocksdb.number.keys.written"},
{NUMBER_KEYS_READ, "rocksdb.number.keys.read"},
{NUMBER_KEYS_UPDATED, "rocksdb.number.keys.updated"},
{BYTES_WRITTEN, "rocksdb.bytes.written"},
{BYTES_READ, "rocksdb.bytes.read"},
{NUMBER_DB_SEEK, "rocksdb.number.db.seek"},
{NUMBER_DB_NEXT, "rocksdb.number.db.next"},
{NUMBER_DB_PREV, "rocksdb.number.db.prev"},
{NUMBER_DB_SEEK_FOUND, "rocksdb.number.db.seek.found"},
{NUMBER_DB_NEXT_FOUND, "rocksdb.number.db.next.found"},
{NUMBER_DB_PREV_FOUND, "rocksdb.number.db.prev.found"},
{ITER_BYTES_READ, "rocksdb.db.iter.bytes.read"},
{NO_FILE_CLOSES, "rocksdb.no.file.closes"},
{NO_FILE_OPENS, "rocksdb.no.file.opens"},
{NO_FILE_ERRORS, "rocksdb.no.file.errors"},
{STALL_L0_SLOWDOWN_MICROS, "rocksdb.l0.slowdown.micros"},
{STALL_MEMTABLE_COMPACTION_MICROS, "rocksdb.memtable.compaction.micros"},
{STALL_L0_NUM_FILES_MICROS, "rocksdb.l0.num.files.stall.micros"},
{STALL_MICROS, "rocksdb.stall.micros"},
{DB_MUTEX_WAIT_MICROS, "rocksdb.db.mutex.wait.micros"},
{RATE_LIMIT_DELAY_MILLIS, "rocksdb.rate.limit.delay.millis"},
{NO_ITERATORS, "rocksdb.num.iterators"},
{NUMBER_MULTIGET_CALLS, "rocksdb.number.multiget.get"},
{NUMBER_MULTIGET_KEYS_READ, "rocksdb.number.multiget.keys.read"},
{NUMBER_MULTIGET_BYTES_READ, "rocksdb.number.multiget.bytes.read"},
{NUMBER_FILTERED_DELETES, "rocksdb.number.deletes.filtered"},
{NUMBER_MERGE_FAILURES, "rocksdb.number.merge.failures"},
{BLOOM_FILTER_PREFIX_CHECKED, "rocksdb.bloom.filter.prefix.checked"},
{BLOOM_FILTER_PREFIX_USEFUL, "rocksdb.bloom.filter.prefix.useful"},
{NUMBER_OF_RESEEKS_IN_ITERATION, "rocksdb.number.reseeks.iteration"},
{GET_UPDATES_SINCE_CALLS, "rocksdb.getupdatessince.calls"},
{BLOCK_CACHE_COMPRESSED_MISS, "rocksdb.block.cachecompressed.miss"},
{BLOCK_CACHE_COMPRESSED_HIT, "rocksdb.block.cachecompressed.hit"},
{BLOCK_CACHE_COMPRESSED_ADD, "rocksdb.block.cachecompressed.add"},
{BLOCK_CACHE_COMPRESSED_ADD_FAILURES,
"rocksdb.block.cachecompressed.add.failures"},
{WAL_FILE_SYNCED, "rocksdb.wal.synced"},
{WAL_FILE_BYTES, "rocksdb.wal.bytes"},
{WRITE_DONE_BY_SELF, "rocksdb.write.self"},
{WRITE_DONE_BY_OTHER, "rocksdb.write.other"},
{WRITE_TIMEDOUT, "rocksdb.write.timeout"},
{WRITE_WITH_WAL, "rocksdb.write.wal"},
{COMPACT_READ_BYTES, "rocksdb.compact.read.bytes"},
{COMPACT_WRITE_BYTES, "rocksdb.compact.write.bytes"},
{FLUSH_WRITE_BYTES, "rocksdb.flush.write.bytes"},
{NUMBER_DIRECT_LOAD_TABLE_PROPERTIES,
"rocksdb.number.direct.load.table.properties"},
{NUMBER_SUPERVERSION_ACQUIRES, "rocksdb.number.superversion_acquires"},
{NUMBER_SUPERVERSION_RELEASES, "rocksdb.number.superversion_releases"},
{NUMBER_SUPERVERSION_CLEANUPS, "rocksdb.number.superversion_cleanups"},
{NUMBER_BLOCK_COMPRESSED, "rocksdb.number.block.compressed"},
{NUMBER_BLOCK_DECOMPRESSED, "rocksdb.number.block.decompressed"},
{NUMBER_BLOCK_NOT_COMPRESSED, "rocksdb.number.block.not_compressed"},
{MERGE_OPERATION_TOTAL_TIME, "rocksdb.merge.operation.time.nanos"},
{FILTER_OPERATION_TOTAL_TIME, "rocksdb.filter.operation.time.nanos"},
{ROW_CACHE_HIT, "rocksdb.row.cache.hit"},
{ROW_CACHE_MISS, "rocksdb.row.cache.miss"},
{READ_AMP_ESTIMATE_USEFUL_BYTES, "rocksdb.read.amp.estimate.useful.bytes"},
{READ_AMP_TOTAL_READ_BYTES, "rocksdb.read.amp.total.read.bytes"},
{NUMBER_RATE_LIMITER_DRAINS, "rocksdb.number.rate_limiter.drains"},
{NUMBER_ITER_SKIP, "rocksdb.number.iter.skip"},
{BLOB_DB_NUM_PUT, "rocksdb.blobdb.num.put"},
{BLOB_DB_NUM_WRITE, "rocksdb.blobdb.num.write"},
{BLOB_DB_NUM_GET, "rocksdb.blobdb.num.get"},
{BLOB_DB_NUM_MULTIGET, "rocksdb.blobdb.num.multiget"},
{BLOB_DB_NUM_SEEK, "rocksdb.blobdb.num.seek"},
{BLOB_DB_NUM_NEXT, "rocksdb.blobdb.num.next"},
{BLOB_DB_NUM_PREV, "rocksdb.blobdb.num.prev"},
{BLOB_DB_NUM_KEYS_WRITTEN, "rocksdb.blobdb.num.keys.written"},
{BLOB_DB_NUM_KEYS_READ, "rocksdb.blobdb.num.keys.read"},
{BLOB_DB_BYTES_WRITTEN, "rocksdb.blobdb.bytes.written"},
{BLOB_DB_BYTES_READ, "rocksdb.blobdb.bytes.read"},
{BLOB_DB_WRITE_INLINED, "rocksdb.blobdb.write.inlined"},
{BLOB_DB_WRITE_INLINED_TTL, "rocksdb.blobdb.write.inlined.ttl"},
{BLOB_DB_WRITE_BLOB, "rocksdb.blobdb.write.blob"},
{BLOB_DB_WRITE_BLOB_TTL, "rocksdb.blobdb.write.blob.ttl"},
{BLOB_DB_BLOB_FILE_BYTES_WRITTEN, "rocksdb.blobdb.blob.file.bytes.written"},
{BLOB_DB_BLOB_FILE_BYTES_READ, "rocksdb.blobdb.blob.file.bytes.read"},
{BLOB_DB_BLOB_FILE_SYNCED, "rocksdb.blobdb.blob.file.synced"},
{BLOB_DB_BLOB_INDEX_EXPIRED_COUNT,
"rocksdb.blobdb.blob.index.expired.count"},
{BLOB_DB_BLOB_INDEX_EXPIRED_SIZE, "rocksdb.blobdb.blob.index.expired.size"},
{BLOB_DB_BLOB_INDEX_EVICTED_COUNT,
"rocksdb.blobdb.blob.index.evicted.count"},
{BLOB_DB_BLOB_INDEX_EVICTED_SIZE, "rocksdb.blobdb.blob.index.evicted.size"},
{BLOB_DB_GC_NUM_FILES, "rocksdb.blobdb.gc.num.files"},
{BLOB_DB_GC_NUM_NEW_FILES, "rocksdb.blobdb.gc.num.new.files"},
{BLOB_DB_GC_FAILURES, "rocksdb.blobdb.gc.failures"},
{BLOB_DB_GC_NUM_KEYS_OVERWRITTEN, "rocksdb.blobdb.gc.num.keys.overwritten"},
{BLOB_DB_GC_NUM_KEYS_EXPIRED, "rocksdb.blobdb.gc.num.keys.expired"},
{BLOB_DB_GC_NUM_KEYS_RELOCATED, "rocksdb.blobdb.gc.num.keys.relocated"},
{BLOB_DB_GC_BYTES_OVERWRITTEN, "rocksdb.blobdb.gc.bytes.overwritten"},
{BLOB_DB_GC_BYTES_EXPIRED, "rocksdb.blobdb.gc.bytes.expired"},
{BLOB_DB_GC_BYTES_RELOCATED, "rocksdb.blobdb.gc.bytes.relocated"},
{BLOB_DB_FIFO_NUM_FILES_EVICTED, "rocksdb.blobdb.fifo.num.files.evicted"},
{BLOB_DB_FIFO_NUM_KEYS_EVICTED, "rocksdb.blobdb.fifo.num.keys.evicted"},
{BLOB_DB_FIFO_BYTES_EVICTED, "rocksdb.blobdb.fifo.bytes.evicted"},
{TXN_PREPARE_MUTEX_OVERHEAD, "rocksdb.txn.overhead.mutex.prepare"},
{TXN_OLD_COMMIT_MAP_MUTEX_OVERHEAD,
"rocksdb.txn.overhead.mutex.old.commit.map"},
{TXN_DUPLICATE_KEY_OVERHEAD, "rocksdb.txn.overhead.duplicate.key"},
{TXN_SNAPSHOT_MUTEX_OVERHEAD, "rocksdb.txn.overhead.mutex.snapshot"},
{TXN_GET_TRY_AGAIN, "rocksdb.txn.get.tryagain"},
{NUMBER_MULTIGET_KEYS_FOUND, "rocksdb.number.multiget.keys.found"},
{NO_ITERATOR_CREATED, "rocksdb.num.iterator.created"},
{NO_ITERATOR_DELETED, "rocksdb.num.iterator.deleted"},
{BLOCK_CACHE_COMPRESSION_DICT_MISS,
"rocksdb.block.cache.compression.dict.miss"},
{BLOCK_CACHE_COMPRESSION_DICT_HIT,
"rocksdb.block.cache.compression.dict.hit"},
{BLOCK_CACHE_COMPRESSION_DICT_ADD,
"rocksdb.block.cache.compression.dict.add"},
{BLOCK_CACHE_COMPRESSION_DICT_BYTES_INSERT,
"rocksdb.block.cache.compression.dict.bytes.insert"},
{BLOCK_CACHE_COMPRESSION_DICT_BYTES_EVICT,
"rocksdb.block.cache.compression.dict.bytes.evict"},
{BLOCK_CACHE_ADD_REDUNDANT, "rocksdb.block.cache.add.redundant"},
{BLOCK_CACHE_INDEX_ADD_REDUNDANT,
"rocksdb.block.cache.index.add.redundant"},
{BLOCK_CACHE_FILTER_ADD_REDUNDANT,
"rocksdb.block.cache.filter.add.redundant"},
{BLOCK_CACHE_DATA_ADD_REDUNDANT, "rocksdb.block.cache.data.add.redundant"},
{BLOCK_CACHE_COMPRESSION_DICT_ADD_REDUNDANT,
"rocksdb.block.cache.compression.dict.add.redundant"},
};
const std::vector<std::pair<Histograms, std::string>> HistogramsNameMap = {
{DB_GET, "rocksdb.db.get.micros"},
{DB_WRITE, "rocksdb.db.write.micros"},
{COMPACTION_TIME, "rocksdb.compaction.times.micros"},
{COMPACTION_CPU_TIME, "rocksdb.compaction.times.cpu_micros"},
{SUBCOMPACTION_SETUP_TIME, "rocksdb.subcompaction.setup.times.micros"},
{TABLE_SYNC_MICROS, "rocksdb.table.sync.micros"},
{COMPACTION_OUTFILE_SYNC_MICROS, "rocksdb.compaction.outfile.sync.micros"},
{WAL_FILE_SYNC_MICROS, "rocksdb.wal.file.sync.micros"},
{MANIFEST_FILE_SYNC_MICROS, "rocksdb.manifest.file.sync.micros"},
{TABLE_OPEN_IO_MICROS, "rocksdb.table.open.io.micros"},
{DB_MULTIGET, "rocksdb.db.multiget.micros"},
{READ_BLOCK_COMPACTION_MICROS, "rocksdb.read.block.compaction.micros"},
{READ_BLOCK_GET_MICROS, "rocksdb.read.block.get.micros"},
{WRITE_RAW_BLOCK_MICROS, "rocksdb.write.raw.block.micros"},
{STALL_L0_SLOWDOWN_COUNT, "rocksdb.l0.slowdown.count"},
{STALL_MEMTABLE_COMPACTION_COUNT, "rocksdb.memtable.compaction.count"},
{STALL_L0_NUM_FILES_COUNT, "rocksdb.num.files.stall.count"},
{HARD_RATE_LIMIT_DELAY_COUNT, "rocksdb.hard.rate.limit.delay.count"},
{SOFT_RATE_LIMIT_DELAY_COUNT, "rocksdb.soft.rate.limit.delay.count"},
{NUM_FILES_IN_SINGLE_COMPACTION, "rocksdb.numfiles.in.singlecompaction"},
{DB_SEEK, "rocksdb.db.seek.micros"},
{WRITE_STALL, "rocksdb.db.write.stall"},
{SST_READ_MICROS, "rocksdb.sst.read.micros"},
{NUM_SUBCOMPACTIONS_SCHEDULED, "rocksdb.num.subcompactions.scheduled"},
{BYTES_PER_READ, "rocksdb.bytes.per.read"},
{BYTES_PER_WRITE, "rocksdb.bytes.per.write"},
{BYTES_PER_MULTIGET, "rocksdb.bytes.per.multiget"},
{BYTES_COMPRESSED, "rocksdb.bytes.compressed"},
{BYTES_DECOMPRESSED, "rocksdb.bytes.decompressed"},
{COMPRESSION_TIMES_NANOS, "rocksdb.compression.times.nanos"},
{DECOMPRESSION_TIMES_NANOS, "rocksdb.decompression.times.nanos"},
{READ_NUM_MERGE_OPERANDS, "rocksdb.read.num.merge_operands"},
{BLOB_DB_KEY_SIZE, "rocksdb.blobdb.key.size"},
{BLOB_DB_VALUE_SIZE, "rocksdb.blobdb.value.size"},
{BLOB_DB_WRITE_MICROS, "rocksdb.blobdb.write.micros"},
{BLOB_DB_GET_MICROS, "rocksdb.blobdb.get.micros"},
{BLOB_DB_MULTIGET_MICROS, "rocksdb.blobdb.multiget.micros"},
{BLOB_DB_SEEK_MICROS, "rocksdb.blobdb.seek.micros"},
{BLOB_DB_NEXT_MICROS, "rocksdb.blobdb.next.micros"},
{BLOB_DB_PREV_MICROS, "rocksdb.blobdb.prev.micros"},
{BLOB_DB_BLOB_FILE_WRITE_MICROS, "rocksdb.blobdb.blob.file.write.micros"},
{BLOB_DB_BLOB_FILE_READ_MICROS, "rocksdb.blobdb.blob.file.read.micros"},
{BLOB_DB_BLOB_FILE_SYNC_MICROS, "rocksdb.blobdb.blob.file.sync.micros"},
{BLOB_DB_GC_MICROS, "rocksdb.blobdb.gc.micros"},
{BLOB_DB_COMPRESSION_MICROS, "rocksdb.blobdb.compression.micros"},
{BLOB_DB_DECOMPRESSION_MICROS, "rocksdb.blobdb.decompression.micros"},
{FLUSH_TIME, "rocksdb.db.flush.micros"},
{SST_BATCH_SIZE, "rocksdb.sst.batch.size"},
};
std::shared_ptr<Statistics> CreateDBStatistics() {
return std::make_shared<StatisticsImpl>(nullptr);
}
StatisticsImpl::StatisticsImpl(std::shared_ptr<Statistics> stats)
: stats_(std::move(stats)) {}
StatisticsImpl::~StatisticsImpl() {}
uint64_t StatisticsImpl::getTickerCount(uint32_t tickerType) const {
MutexLock lock(&aggregate_lock_);
return getTickerCountLocked(tickerType);
}
uint64_t StatisticsImpl::getTickerCountLocked(uint32_t tickerType) const {
assert(tickerType < TICKER_ENUM_MAX);
uint64_t res = 0;
for (size_t core_idx = 0; core_idx < per_core_stats_.Size(); ++core_idx) {
res += per_core_stats_.AccessAtCore(core_idx)->tickers_[tickerType];
}
return res;
}
void StatisticsImpl::histogramData(uint32_t histogramType,
HistogramData* const data) const {
MutexLock lock(&aggregate_lock_);
getHistogramImplLocked(histogramType)->Data(data);
}
std::unique_ptr<HistogramImpl> StatisticsImpl::getHistogramImplLocked(
uint32_t histogramType) const {
assert(histogramType < HISTOGRAM_ENUM_MAX);
std::unique_ptr<HistogramImpl> res_hist(new HistogramImpl());
for (size_t core_idx = 0; core_idx < per_core_stats_.Size(); ++core_idx) {
res_hist->Merge(
per_core_stats_.AccessAtCore(core_idx)->histograms_[histogramType]);
}
return res_hist;
}
std::string StatisticsImpl::getHistogramString(uint32_t histogramType) const {
MutexLock lock(&aggregate_lock_);
return getHistogramImplLocked(histogramType)->ToString();
}
void StatisticsImpl::setTickerCount(uint32_t tickerType, uint64_t count) {
{
MutexLock lock(&aggregate_lock_);
setTickerCountLocked(tickerType, count);
}
if (stats_ && tickerType < TICKER_ENUM_MAX) {
stats_->setTickerCount(tickerType, count);
}
}
void StatisticsImpl::setTickerCountLocked(uint32_t tickerType, uint64_t count) {
assert(tickerType < TICKER_ENUM_MAX);
for (size_t core_idx = 0; core_idx < per_core_stats_.Size(); ++core_idx) {
if (core_idx == 0) {
per_core_stats_.AccessAtCore(core_idx)->tickers_[tickerType] = count;
} else {
per_core_stats_.AccessAtCore(core_idx)->tickers_[tickerType] = 0;
}
}
}
uint64_t StatisticsImpl::getAndResetTickerCount(uint32_t tickerType) {
uint64_t sum = 0;
{
MutexLock lock(&aggregate_lock_);
assert(tickerType < TICKER_ENUM_MAX);
for (size_t core_idx = 0; core_idx < per_core_stats_.Size(); ++core_idx) {
sum +=
per_core_stats_.AccessAtCore(core_idx)->tickers_[tickerType].exchange(
0, std::memory_order_relaxed);
}
}
if (stats_ && tickerType < TICKER_ENUM_MAX) {
stats_->setTickerCount(tickerType, 0);
}
return sum;
}
void StatisticsImpl::recordTick(uint32_t tickerType, uint64_t count) {
assert(tickerType < TICKER_ENUM_MAX);
per_core_stats_.Access()->tickers_[tickerType].fetch_add(
count, std::memory_order_relaxed);
if (stats_ && tickerType < TICKER_ENUM_MAX) {
stats_->recordTick(tickerType, count);
}
}
void StatisticsImpl::recordInHistogram(uint32_t histogramType, uint64_t value) {
assert(histogramType < HISTOGRAM_ENUM_MAX);
if (get_stats_level() <= StatsLevel::kExceptHistogramOrTimers) {
return;
}
per_core_stats_.Access()->histograms_[histogramType].Add(value);
if (stats_ && histogramType < HISTOGRAM_ENUM_MAX) {
stats_->recordInHistogram(histogramType, value);
}
}
Status StatisticsImpl::Reset() {
MutexLock lock(&aggregate_lock_);
for (uint32_t i = 0; i < TICKER_ENUM_MAX; ++i) {
setTickerCountLocked(i, 0);
}
for (uint32_t i = 0; i < HISTOGRAM_ENUM_MAX; ++i) {
for (size_t core_idx = 0; core_idx < per_core_stats_.Size(); ++core_idx) {
per_core_stats_.AccessAtCore(core_idx)->histograms_[i].Clear();
}
}
return Status::OK();
}
namespace {
// a buffer size used for temp string buffers
const int kTmpStrBufferSize = 200;
} // namespace
std::string StatisticsImpl::ToString() const {
MutexLock lock(&aggregate_lock_);
std::string res;
res.reserve(20000);
for (const auto& t : TickersNameMap) {
assert(t.first < TICKER_ENUM_MAX);
char buffer[kTmpStrBufferSize];
snprintf(buffer, kTmpStrBufferSize, "%s COUNT : %" PRIu64 "\n",
t.second.c_str(), getTickerCountLocked(t.first));
res.append(buffer);
}
for (const auto& h : HistogramsNameMap) {
assert(h.first < HISTOGRAM_ENUM_MAX);
char buffer[kTmpStrBufferSize];
HistogramData hData;
getHistogramImplLocked(h.first)->Data(&hData);
// don't handle failures - buffer should always be big enough and arguments
// should be provided correctly
int ret =
snprintf(buffer, kTmpStrBufferSize,
"%s P50 : %f P95 : %f P99 : %f P100 : %f COUNT : %" PRIu64
" SUM : %" PRIu64 "\n",
h.second.c_str(), hData.median, hData.percentile95,
hData.percentile99, hData.max, hData.count, hData.sum);
if (ret < 0 || ret >= kTmpStrBufferSize) {
assert(false);
continue;
}
res.append(buffer);
}
res.shrink_to_fit();
return res;
}
bool StatisticsImpl::getTickerMap(
std::map<std::string, uint64_t>* stats_map) const {
assert(stats_map);
if (!stats_map) return false;
stats_map->clear();
MutexLock lock(&aggregate_lock_);
for (const auto& t : TickersNameMap) {
assert(t.first < TICKER_ENUM_MAX);
(*stats_map)[t.second.c_str()] = getTickerCountLocked(t.first);
}
return true;
}
bool StatisticsImpl::HistEnabledForType(uint32_t type) const {
return type < HISTOGRAM_ENUM_MAX;
}
} // namespace ROCKSDB_NAMESPACE
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