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Add knob for tuning number of RocksDB read threads

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This commit is contained in:
Daniel Smith 2020-10-14 22:07:46 +00:00
parent 2671157f8f
commit a99b68a7e3
3 changed files with 3 additions and 2 deletions
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3
fdbserver/KeyValueStoreRocksDB.actor.cpp
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@ -269,7 +269,6 @@ struct RocksDBKeyValueStore : IKeyValueStore {
UID id;
Reference<IThreadPool> writeThread;
Reference<IThreadPool> readThreads;
unsigned nReaders = 16;
Promise<Void> errorPromise;
Promise<Void> closePromise;
std::unique_ptr<rocksdb::WriteBatch> writeBatch;
@ -281,7 +280,7 @@ struct RocksDBKeyValueStore : IKeyValueStore {
writeThread = createGenericThreadPool();
readThreads = createGenericThreadPool();
writeThread->addThread(new Writer(db, id));
for (unsigned i = 0; i < nReaders; ++i) {
for (unsigned i = 0; i < SERVER_KNOBS->ROCKSDB_READ_PARALLELISM; ++i) {
readThreads->addThread(new Reader(db));
}
}

1
fdbserver/Knobs.cpp
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@ -315,6 +315,7 @@ void ServerKnobs::initialize(bool randomize, ClientKnobs* clientKnobs, bool isSi
// KeyValueStoreRocksDB
init( ROCKSDB_BACKGROUND_PARALLELISM, 0 );
init( ROCKSDB_READ_PARALLELISM, 4 );
init( ROCKSDB_MEMTABLE_BYTES, 512 * 1024 * 1024 );
init( ROCKSDB_UNSAFE_AUTO_FSYNC, false );
init( ROCKSDB_PERIODIC_COMPACTION_SECONDS, 0 );

1
fdbserver/Knobs.h
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@ -250,6 +250,7 @@ public:
// KeyValueStoreRocksDB
int ROCKSDB_BACKGROUND_PARALLELISM;
int ROCKSDB_READ_PARALLELISM;
int64_t ROCKSDB_MEMTABLE_BYTES;
bool ROCKSDB_UNSAFE_AUTO_FSYNC;
int64_t ROCKSDB_PERIODIC_COMPACTION_SECONDS;