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db_bench background work thread pool size arguments

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Summary:
The background thread pools' sizes weren't easily configurable by `max_background_compactions` and `max_background_flushes` in multi-instance setups. Introduced separate arguments for their sizes.
Closes https://github.com/facebook/rocksdb/pull/2680

Differential Revision: D5550675

Pulled By: ajkr

fbshipit-source-id: bab5f0a7bc5db63bb084d0c10facbe437096367d
This commit is contained in:
Andrew Kryczka 2017-08-03 21:30:37 -07:00 committed by Facebook Github Bot
parent 4f81ab38bf
commit dce6d5a838
1 changed files with 13 additions and 4 deletions
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17
tools/db_bench_tool.cc
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@ -322,6 +322,14 @@ DEFINE_int32(num_bottom_pri_threads, 0,
"The number of threads in the bottom-priority thread pool (used "
"by universal compaction only).");
DEFINE_int32(num_high_pri_threads, 0,
"The maximum number of concurrent background compactions"
" that can occur in parallel.");
DEFINE_int32(num_low_pri_threads, 0,
"The maximum number of concurrent background compactions"
" that can occur in parallel.");
DEFINE_int32(max_background_compactions,
rocksdb::Options().max_background_compactions,
"The maximum number of concurrent background compactions"
@ -5241,13 +5249,14 @@ int db_bench_tool(int argc, char** argv) {
FLAGS_rep_factory = StringToRepFactory(FLAGS_memtablerep.c_str());
// The number of background threads should be at least as much the
// max number of concurrent compactions.
FLAGS_env->SetBackgroundThreads(FLAGS_max_background_compactions);
FLAGS_env->SetBackgroundThreads(FLAGS_max_background_flushes,
// Note options sanitization may increase thread pool sizes according to
// max_background_flushes/max_background_compactions/max_background_jobs
FLAGS_env->SetBackgroundThreads(FLAGS_num_high_pri_threads,
rocksdb::Env::Priority::HIGH);
FLAGS_env->SetBackgroundThreads(FLAGS_num_bottom_pri_threads,
rocksdb::Env::Priority::BOTTOM);
FLAGS_env->SetBackgroundThreads(FLAGS_num_low_pri_threads,
rocksdb::Env::Priority::LOW);
// Choose a location for the test database if none given with --db=<path>
if (FLAGS_db.empty()) {