rocksdb/thrift/lib/cpp/test/loadgen/LatencyScoreBoard.h
Dhruba Borthakur 80c663882a Create leveldb server via Thrift.
Summary:
First draft.
Unit tests pass.

Test Plan: unit tests attached

Reviewers: heyongqiang

Reviewed By: heyongqiang

Differential Revision: https://reviews.facebook.net/D3969
2012-07-07 09:42:39 -07:00

99 lines
2.9 KiB
C++

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#ifndef THRIFT_TEST_LOADGEN_LATENCYSCOREBOARD_H_
#define THRIFT_TEST_LOADGEN_LATENCYSCOREBOARD_H_ 1
#include "thrift/lib/cpp/test/loadgen/ScoreBoard.h"
#include "thrift/lib/cpp/test/loadgen/ScoreBoardOpVector.h"
namespace apache { namespace thrift { namespace loadgen {
/**
* A ScoreBoard that tracks number of queries per second, as well as
* information about how long each operation takes.
*
* This ScoreBoard calls gettimeofday() twice for each operation, so it does
* add a small amount of overhead. If you have extremely high performance
* requirements, you could use QpsScoreBoard to track just the QPS rate and
* eliminate the gettimeofday() calls.
*/
class LatencyScoreBoard : public ScoreBoard {
public:
class OpData {
public:
OpData();
void addDataPoint(uint64_t latencyUsecs);
void zero();
void accumulate(const OpData* other);
uint64_t getCount() const;
uint64_t getCountSince(const OpData* other) const;
double getLatencyAvg() const;
double getLatencyAvgSince(const OpData* other) const;
double getLatencyStdDev() const;
double getLatencyStdDevSince(const OpData* other) const;
uint64_t count_;
uint64_t usecSum_;
uint64_t sumOfSquares_;
};
LatencyScoreBoard(uint32_t numOpsHint)
: startTime_(0)
, opData_(numOpsHint) {}
virtual void opStarted(uint32_t opType);
virtual void opSucceeded(uint32_t opType);
virtual void opFailed(uint32_t opType);
/**
* Get the OpData for a particular operation type
*/
const OpData* getOpData(uint32_t opType);
/**
* Compute an OpData object with aggregate information over all operation
* types.
*
* @param result A pointer to the OpData object to fill in with aggregate
* information.
*/
void computeOpAggregate(OpData* result) const;
/**
* Zero out the statistics.
*/
void zero();
/**
* Add the counters from another scoreboard to this one.
*/
void accumulate(const LatencyScoreBoard* other);
private:
int64_t startTime_;
ScoreBoardOpVector<OpData> opData_;
};
}}} // apache::thrift::loadgen
#endif // THRIFT_TEST_LOADGEN_LATENCYSCOREBOARD_H_