mirror of https://github.com/facebook/rocksdb.git
409 lines
16 KiB
C++
409 lines
16 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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#include "tools/block_cache_trace_analyzer.h"
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#include <cinttypes>
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#include <set>
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#include "monitoring/histogram.h"
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namespace rocksdb {
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namespace {
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std::string block_type_to_string(TraceType type) {
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switch (type) {
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case kBlockTraceFilterBlock:
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return "Filter";
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case kBlockTraceDataBlock:
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return "Data";
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case kBlockTraceIndexBlock:
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return "Index";
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case kBlockTraceRangeDeletionBlock:
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return "RangeDeletion";
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case kBlockTraceUncompressionDictBlock:
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return "UncompressionDict";
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default:
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break;
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}
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// This cannot happen.
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return "InvalidType";
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}
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std::string caller_to_string(BlockCacheLookupCaller caller) {
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switch (caller) {
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case kUserGet:
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return "Get";
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case kUserMGet:
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return "MultiGet";
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case kUserIterator:
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return "Iterator";
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case kPrefetch:
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return "Prefetch";
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case kCompaction:
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return "Compaction";
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default:
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break;
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}
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// This cannot happen.
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return "InvalidCaller";
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}
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} // namespace
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BlockCacheTraceAnalyzer::BlockCacheTraceAnalyzer(
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const std::string& trace_file_path)
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: trace_file_path_(trace_file_path) {
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env_ = rocksdb::Env::Default();
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}
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void BlockCacheTraceAnalyzer::RecordAccess(
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const BlockCacheTraceRecord& access) {
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ColumnFamilyAccessInfoAggregate& cf_aggr = cf_aggregates_map_[access.cf_name];
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SSTFileAccessInfoAggregate& file_aggr =
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cf_aggr.fd_aggregates_map[access.sst_fd_number];
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file_aggr.level = access.level;
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BlockTypeAccessInfoAggregate& block_type_aggr =
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file_aggr.block_type_aggregates_map[access.block_type];
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BlockAccessInfo& block_access_info =
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block_type_aggr.block_access_info_map[access.block_key];
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block_access_info.AddAccess(access);
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}
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Status BlockCacheTraceAnalyzer::Analyze() {
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std::unique_ptr<TraceReader> trace_reader;
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Status s =
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NewFileTraceReader(env_, EnvOptions(), trace_file_path_, &trace_reader);
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if (!s.ok()) {
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return s;
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}
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BlockCacheTraceReader reader(std::move(trace_reader));
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s = reader.ReadHeader(&header_);
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if (!s.ok()) {
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return s;
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}
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while (s.ok()) {
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BlockCacheTraceRecord access;
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s = reader.ReadAccess(&access);
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if (!s.ok()) {
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return s;
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}
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RecordAccess(access);
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}
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return Status::OK();
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}
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void BlockCacheTraceAnalyzer::PrintBlockSizeStats() const {
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HistogramStat bs_stats;
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std::map<TraceType, HistogramStat> bt_stats_map;
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std::map<std::string, std::map<TraceType, HistogramStat>> cf_bt_stats_map;
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for (auto const& cf_aggregates : cf_aggregates_map_) {
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// Stats per column family.
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const std::string& cf_name = cf_aggregates.first;
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for (auto const& file_aggregates : cf_aggregates.second.fd_aggregates_map) {
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// Stats per SST file.
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for (auto const& block_type_aggregates :
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file_aggregates.second.block_type_aggregates_map) {
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// Stats per block type.
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const TraceType type = block_type_aggregates.first;
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for (auto const& block_access_info :
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block_type_aggregates.second.block_access_info_map) {
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// Stats per block.
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bs_stats.Add(block_access_info.second.block_size);
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bt_stats_map[type].Add(block_access_info.second.block_size);
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cf_bt_stats_map[cf_name][type].Add(
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block_access_info.second.block_size);
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}
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}
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}
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}
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fprintf(stdout, "Block size stats: \n%s", bs_stats.ToString().c_str());
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for (auto const& bt_stats : bt_stats_map) {
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fprintf(stdout, "Block size stats for block type %s: \n%s",
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block_type_to_string(bt_stats.first).c_str(),
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bt_stats.second.ToString().c_str());
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}
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for (auto const& cf_bt_stats : cf_bt_stats_map) {
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const std::string& cf_name = cf_bt_stats.first;
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for (auto const& bt_stats : cf_bt_stats.second) {
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fprintf(stdout,
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"Block size stats for column family %s and block type %s: \n%s",
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cf_name.c_str(), block_type_to_string(bt_stats.first).c_str(),
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bt_stats.second.ToString().c_str());
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}
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}
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}
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void BlockCacheTraceAnalyzer::PrintAccessCountStats() const {
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HistogramStat access_stats;
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std::map<TraceType, HistogramStat> bt_stats_map;
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std::map<std::string, std::map<TraceType, HistogramStat>> cf_bt_stats_map;
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for (auto const& cf_aggregates : cf_aggregates_map_) {
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// Stats per column family.
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const std::string& cf_name = cf_aggregates.first;
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for (auto const& file_aggregates : cf_aggregates.second.fd_aggregates_map) {
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// Stats per SST file.
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for (auto const& block_type_aggregates :
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file_aggregates.second.block_type_aggregates_map) {
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// Stats per block type.
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const TraceType type = block_type_aggregates.first;
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for (auto const& block_access_info :
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block_type_aggregates.second.block_access_info_map) {
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// Stats per block.
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access_stats.Add(block_access_info.second.num_accesses);
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bt_stats_map[type].Add(block_access_info.second.num_accesses);
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cf_bt_stats_map[cf_name][type].Add(
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block_access_info.second.num_accesses);
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}
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}
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}
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}
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fprintf(stdout, "Block access count stats: \n%s",
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access_stats.ToString().c_str());
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for (auto const& bt_stats : bt_stats_map) {
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fprintf(stdout, "Block access count stats for block type %s: \n%s",
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block_type_to_string(bt_stats.first).c_str(),
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bt_stats.second.ToString().c_str());
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}
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for (auto const& cf_bt_stats : cf_bt_stats_map) {
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const std::string& cf_name = cf_bt_stats.first;
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for (auto const& bt_stats : cf_bt_stats.second) {
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fprintf(stdout,
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"Block access count stats for column family %s and block type "
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"%s: \n%s",
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cf_name.c_str(), block_type_to_string(bt_stats.first).c_str(),
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bt_stats.second.ToString().c_str());
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}
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}
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}
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void BlockCacheTraceAnalyzer::PrintDataBlockAccessStats() const {
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HistogramStat existing_keys_stats;
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std::map<std::string, HistogramStat> cf_existing_keys_stats_map;
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HistogramStat non_existing_keys_stats;
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std::map<std::string, HistogramStat> cf_non_existing_keys_stats_map;
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HistogramStat block_access_stats;
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std::map<std::string, HistogramStat> cf_block_access_info;
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for (auto const& cf_aggregates : cf_aggregates_map_) {
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// Stats per column family.
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const std::string& cf_name = cf_aggregates.first;
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for (auto const& file_aggregates : cf_aggregates.second.fd_aggregates_map) {
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// Stats per SST file.
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for (auto const& block_type_aggregates :
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file_aggregates.second.block_type_aggregates_map) {
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// Stats per block type.
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for (auto const& block_access_info :
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block_type_aggregates.second.block_access_info_map) {
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// Stats per block.
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if (block_access_info.second.num_keys == 0) {
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continue;
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}
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// Use four decimal points.
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uint64_t percent_referenced_for_existing_keys = (uint64_t)(
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((double)block_access_info.second.key_num_access_map.size() /
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(double)block_access_info.second.num_keys) *
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10000.0);
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uint64_t percent_referenced_for_non_existing_keys =
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(uint64_t)(((double)block_access_info.second
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.non_exist_key_num_access_map.size() /
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(double)block_access_info.second.num_keys) *
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10000.0);
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uint64_t percent_accesses_for_existing_keys = (uint64_t)(
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((double)
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block_access_info.second.num_referenced_key_exist_in_block /
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(double)block_access_info.second.num_accesses) *
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10000.0);
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existing_keys_stats.Add(percent_referenced_for_existing_keys);
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cf_existing_keys_stats_map[cf_name].Add(
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percent_referenced_for_existing_keys);
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non_existing_keys_stats.Add(percent_referenced_for_non_existing_keys);
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cf_non_existing_keys_stats_map[cf_name].Add(
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percent_referenced_for_non_existing_keys);
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block_access_stats.Add(percent_accesses_for_existing_keys);
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cf_block_access_info[cf_name].Add(percent_accesses_for_existing_keys);
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}
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}
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}
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}
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fprintf(stdout,
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"Histogram on percentage of referenced keys existing in a block over "
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"the total number of keys in a block: \n%s",
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existing_keys_stats.ToString().c_str());
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for (auto const& cf_stats : cf_existing_keys_stats_map) {
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fprintf(stdout, "Break down by column family %s: \n%s",
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cf_stats.first.c_str(), cf_stats.second.ToString().c_str());
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}
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fprintf(
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stdout,
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"Histogram on percentage of referenced keys DO NOT exist in a block over "
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"the total number of keys in a block: \n%s",
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non_existing_keys_stats.ToString().c_str());
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for (auto const& cf_stats : cf_non_existing_keys_stats_map) {
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fprintf(stdout, "Break down by column family %s: \n%s",
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cf_stats.first.c_str(), cf_stats.second.ToString().c_str());
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}
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fprintf(stdout,
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"Histogram on percentage of accesses on keys exist in a block over "
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"the total number of accesses in a block: \n%s",
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block_access_stats.ToString().c_str());
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for (auto const& cf_stats : cf_block_access_info) {
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fprintf(stdout, "Break down by column family %s: \n%s",
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cf_stats.first.c_str(), cf_stats.second.ToString().c_str());
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}
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}
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void BlockCacheTraceAnalyzer::PrintStatsSummary() const {
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uint64_t total_num_files = 0;
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uint64_t total_num_blocks = 0;
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uint64_t total_num_accesses = 0;
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std::map<TraceType, uint64_t> bt_num_blocks_map;
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std::map<BlockCacheLookupCaller, uint64_t> caller_num_access_map;
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std::map<BlockCacheLookupCaller, std::map<TraceType, uint64_t>>
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caller_bt_num_access_map;
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std::map<BlockCacheLookupCaller, std::map<uint32_t, uint64_t>>
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caller_level_num_access_map;
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for (auto const& cf_aggregates : cf_aggregates_map_) {
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// Stats per column family.
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const std::string& cf_name = cf_aggregates.first;
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uint64_t cf_num_files = 0;
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uint64_t cf_num_blocks = 0;
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std::map<TraceType, uint64_t> cf_bt_blocks;
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uint64_t cf_num_accesses = 0;
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std::map<BlockCacheLookupCaller, uint64_t> cf_caller_num_accesses_map;
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std::map<BlockCacheLookupCaller, std::map<uint64_t, uint64_t>>
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cf_caller_level_num_accesses_map;
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std::map<BlockCacheLookupCaller, std::map<uint64_t, uint64_t>>
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cf_caller_file_num_accesses_map;
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std::map<BlockCacheLookupCaller, std::map<TraceType, uint64_t>>
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cf_caller_bt_num_accesses_map;
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total_num_files += cf_aggregates.second.fd_aggregates_map.size();
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for (auto const& file_aggregates : cf_aggregates.second.fd_aggregates_map) {
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// Stats per SST file.
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const uint64_t fd = file_aggregates.first;
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const uint32_t level = file_aggregates.second.level;
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cf_num_files++;
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for (auto const& block_type_aggregates :
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file_aggregates.second.block_type_aggregates_map) {
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// Stats per block type.
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const TraceType type = block_type_aggregates.first;
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cf_bt_blocks[type] +=
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block_type_aggregates.second.block_access_info_map.size();
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total_num_blocks +=
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block_type_aggregates.second.block_access_info_map.size();
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bt_num_blocks_map[type] +=
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block_type_aggregates.second.block_access_info_map.size();
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for (auto const& block_access_info :
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block_type_aggregates.second.block_access_info_map) {
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// Stats per block.
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cf_num_blocks++;
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for (auto const& stats :
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block_access_info.second.caller_num_access_map) {
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// Stats per caller.
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const BlockCacheLookupCaller caller = stats.first;
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const uint64_t num_accesses = stats.second;
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// Overall stats.
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total_num_accesses += num_accesses;
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caller_num_access_map[caller] += num_accesses;
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caller_bt_num_access_map[caller][type] += num_accesses;
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caller_level_num_access_map[caller][level] += num_accesses;
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// Column Family stats.
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cf_num_accesses++;
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cf_caller_num_accesses_map[caller] += num_accesses;
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cf_caller_level_num_accesses_map[caller][level] += num_accesses;
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cf_caller_file_num_accesses_map[caller][fd] += num_accesses;
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cf_caller_bt_num_accesses_map[caller][type] += num_accesses;
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}
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}
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}
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}
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// Print stats.
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fprintf(
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stdout,
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"***************************************************************\n");
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fprintf(
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stdout,
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"***************************************************************\n");
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fprintf(
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stdout,
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"***************************************************************\n");
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fprintf(stdout, "Statistics for column family %s:\n", cf_name.c_str());
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fprintf(stdout,
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"Number of files:%" PRIu64 "Number of blocks: %" PRIu64
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"Number of accesses: %" PRIu64 "\n",
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cf_num_files, cf_num_blocks, cf_num_accesses);
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for (auto block_type : cf_bt_blocks) {
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fprintf(stdout, "Number of %s blocks: %" PRIu64 "\n",
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block_type_to_string(block_type.first).c_str(),
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block_type.second);
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}
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for (auto caller : cf_caller_num_accesses_map) {
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fprintf(
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stdout,
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"***************************************************************\n");
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fprintf(stdout, "Caller %s: Number of accesses %" PRIu64 "\n",
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caller_to_string(caller.first).c_str(), caller.second);
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fprintf(stdout, "Caller %s: Number of accesses per level break down\n",
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caller_to_string(caller.first).c_str());
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for (auto naccess_level :
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cf_caller_level_num_accesses_map[caller.first]) {
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fprintf(stdout,
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"\t Level %" PRIu64 ": Number of accesses: %" PRIu64 "\n",
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naccess_level.first, naccess_level.second);
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}
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fprintf(stdout, "Caller %s: Number of accesses per file break down\n",
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caller_to_string(caller.first).c_str());
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for (auto naccess_file : cf_caller_file_num_accesses_map[caller.first]) {
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fprintf(stdout,
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"\t File %" PRIu64 ": Number of accesses: %" PRIu64 "\n",
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naccess_file.first, naccess_file.second);
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}
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fprintf(stdout,
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"Caller %s: Number of accesses per block type break down\n",
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caller_to_string(caller.first).c_str());
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for (auto naccess_type : cf_caller_bt_num_accesses_map[caller.first]) {
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fprintf(stdout, "\t Block Type %s: Number of accesses: %" PRIu64 "\n",
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block_type_to_string(naccess_type.first).c_str(),
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naccess_type.second);
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}
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}
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}
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fprintf(stdout,
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"***************************************************************\n");
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fprintf(stdout,
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"***************************************************************\n");
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fprintf(stdout,
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"***************************************************************\n");
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fprintf(stdout, "Overall statistics:\n");
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fprintf(stdout,
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"Number of files: %" PRIu64 " Number of blocks: %" PRIu64
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" Number of accesses: %" PRIu64 "\n",
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total_num_files, total_num_blocks, total_num_accesses);
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for (auto block_type : bt_num_blocks_map) {
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fprintf(stdout, "Number of %s blocks: %" PRIu64 "\n",
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block_type_to_string(block_type.first).c_str(), block_type.second);
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}
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for (auto caller : caller_num_access_map) {
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fprintf(
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stdout,
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"***************************************************************\n");
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fprintf(stdout, "Caller %s: Number of accesses %" PRIu64 "\n",
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caller_to_string(caller.first).c_str(), caller.second);
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fprintf(stdout, "Caller %s: Number of accesses per level break down\n",
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caller_to_string(caller.first).c_str());
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for (auto naccess_level : caller_level_num_access_map[caller.first]) {
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fprintf(stdout, "\t Level %d: Number of accesses: %" PRIu64 "\n",
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naccess_level.first, naccess_level.second);
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}
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fprintf(stdout, "Caller %s: Number of accesses per block type break down\n",
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caller_to_string(caller.first).c_str());
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for (auto naccess_type : caller_bt_num_access_map[caller.first]) {
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fprintf(stdout, "\t Block Type %s: Number of accesses: %" PRIu64 "\n",
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block_type_to_string(naccess_type.first).c_str(),
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naccess_type.second);
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}
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}
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}
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} // namespace rocksdb
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