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#ifndef TIMING_H
#define TIMING_H
/*
* Timing functions
*
* Copyright (C) 2006 Enrico Zini
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <sys/times.h>
#include <unistd.h>
#include <iostream>
class Timing
{
private:
double tps;
std::string tag;
struct tms firsttms;
struct tms lasttms;
std::string format(const struct tms& curtms, const struct tms& lasttms) const
{
std::stringstream str;
double user = (curtms.tms_utime - lasttms.tms_utime)/tps;
double system = (curtms.tms_stime - lasttms.tms_stime)/tps;
str << tag << ": "
<< user << " user, "
<< system << " system, "
<< user + system << " total";
return str.str();
}
public:
Timing(const std::string& tag) :
tps(sysconf(_SC_CLK_TCK)),
tag(tag)
{
if (times(&firsttms) == -1)
throw wibble::exception::System("reading timing information");
lasttms = firsttms;
}
std::string partial()
{
struct tms curtms;
if (times(&curtms) == -1)
throw wibble::exception::System("reading timing information");
std::string res = format(curtms, lasttms);
if (times(&lasttms) == -1)
throw wibble::exception::System("reading timing information");
return res;
}
std::string total()
{
struct tms curtms;
if (times(&curtms) == -1)
throw wibble::exception::System("reading timing information");
return format(curtms, firsttms);
}
};
// vim:set ts=4 sw=4:
#endif
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