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/*
* 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.
*/
/* $Rev$ $Date$ */
#ifndef tuscany_perf_hpp
#define tuscany_perf_hpp
/**
* Functions to help measure performance.
*/
#include <sys/time.h>
#include <time.h>
#include "function.hpp"
namespace tuscany
{
/**
* Measure the time required to perform a function in msec.
*/
struct timeLambda {
const lambda<bool()> f;
timeLambda(const lambda<bool()>& f) : f(f) {
}
bool operator()(const long count) const {
if (count == 0)
return true;
f();
(*this)(count - 1);
return true;
}
};
const double time(const lambda<bool()>& f, const long warmup, const long count) {
const lambda<bool(long)> tl = timeLambda(f);
struct timeval start;
struct timeval end;
tl(warmup);
gettimeofday(&start, NULL);
tl(count);
gettimeofday(&end, NULL);
const long t = (end.tv_sec * 1000 + end.tv_usec / 1000) - (start.tv_sec * 1000 + start.tv_usec / 1000);
return (double)t / (double)count;
}
}
#endif /* tuscany_perf_hpp */
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