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Integrate block cache tracing into db_bench (#5459) 

Summary:
This PR integrates the block cache tracing into db_bench. It adds three command line arguments.
-block_cache_trace_file (Block cache trace file path.) type: string default: ""
-block_cache_trace_max_trace_file_size_in_bytes (The maximum block cache
trace file size in bytes. Block cache accesses will not be logged if the
trace file size exceeds this threshold. Default is 64 GB.) type: int64
default: 68719476736
-block_cache_trace_sampling_frequency (Block cache trace sampling
frequency, termed s. It uses spatial downsampling and samples accesses to
one out of s blocks.) type: int32 default: 1
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5459

Differential Revision: D15832031

Pulled By: HaoyuHuang

fbshipit-source-id: 0ecf2f2686557251fe741a2769b21170777efa3d
This commit is contained in:
haoyuhuang 2019-06-17 11:03:47 -07:00 committed by Facebook Github Bot
parent d1ae67bdb9
commit d43b4cd570
1 changed files with 61 additions and 0 deletions
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61
tools/db_bench_tool.cc
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@ -774,6 +774,17 @@ DEFINE_string(trace_file, "", "Trace workload to a file. ");
DEFINE_int32(trace_replay_fast_forward, 1,
"Fast forward trace replay, must >= 1. ");
DEFINE_int32(block_cache_trace_sampling_frequency, 1,
"Block cache trace sampling frequency, termed s. It uses spatial "
"downsampling and samples accesses to one out of s blocks.");
DEFINE_int64(
block_cache_trace_max_trace_file_size_in_bytes,
uint64_t{64} * 1024 * 1024 * 1024,
"The maximum block cache trace file size in bytes. Block cache accesses "
"will not be logged if the trace file size exceeds this threshold. Default "
"is 64 GB.");
DEFINE_string(block_cache_trace_file, "", "Block cache trace file path.");
static enum rocksdb::CompressionType StringToCompressionType(const char* ctype) {
assert(ctype);
@ -2081,6 +2092,7 @@ class Benchmark {
Options open_options_; // keep options around to properly destroy db later
#ifndef ROCKSDB_LITE
TraceOptions trace_options_;
TraceOptions block_cache_trace_options_;
#endif
int64_t reads_;
int64_t deletes_;
@ -2917,6 +2929,47 @@ class Benchmark {
fprintf(stdout, "Tracing the workload to: [%s]\n",
FLAGS_trace_file.c_str());
}
// Start block cache tracing.
if (!FLAGS_block_cache_trace_file.empty()) {
// Sanity checks.
if (FLAGS_block_cache_trace_sampling_frequency <= 0) {
fprintf(stderr,
"Block cache trace sampling frequency must be higher than "
"0.\n");
exit(1);
}
if (FLAGS_block_cache_trace_max_trace_file_size_in_bytes <= 0) {
fprintf(stderr,
"The maximum file size for block cache tracing must be "
"higher than 0.\n");
exit(1);
}
block_cache_trace_options_.max_trace_file_size =
FLAGS_block_cache_trace_max_trace_file_size_in_bytes;
block_cache_trace_options_.sampling_frequency =
FLAGS_block_cache_trace_sampling_frequency;
std::unique_ptr<TraceWriter> block_cache_trace_writer;
Status s = NewFileTraceWriter(FLAGS_env, EnvOptions(),
FLAGS_block_cache_trace_file,
&block_cache_trace_writer);
if (!s.ok()) {
fprintf(stderr,
"Encountered an error when creating trace writer, %s\n",
s.ToString().c_str());
exit(1);
}
s = db_.db->StartBlockCacheTrace(block_cache_trace_options_,
std::move(block_cache_trace_writer));
if (!s.ok()) {
fprintf(
stderr,
"Encountered an error when starting block cache tracing, %s\n",
s.ToString().c_str());
exit(1);
}
fprintf(stdout, "Tracing block cache accesses to: [%s]\n",
FLAGS_block_cache_trace_file.c_str());
}
#endif // ROCKSDB_LITE
if (num_warmup > 0) {
@ -2959,6 +3012,14 @@ class Benchmark {
s.ToString().c_str());
}
}
if (!FLAGS_block_cache_trace_file.empty()) {
Status s = db_.db->EndBlockCacheTrace();
if (!s.ok()) {
fprintf(stderr,
"Encountered an error ending the block cache tracing, %s\n",
s.ToString().c_str());
}
}
#endif // ROCKSDB_LITE
if (FLAGS_statistics) {