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SWIFT
SWIFTsim
Commits
12f69efd
Commit
12f69efd
authored
Mar 02, 2016
by
Peter W. Draper
Browse files
Start adding a clocks API for measuring time in seconds
parent
9da3578f
Changes
3
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Inline
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src/Makefile.am
View file @
12f69efd
...
...
@@ -35,13 +35,13 @@ endif
# List required headers
include_HEADERS
=
space.h runner.h queue.h task.h lock.h cell.h part.h const.h
\
engine.h swift.h serial_io.h timers.h debug.h scheduler.h proxy.h parallel_io.h
\
common_io.h single_io.h multipole.h map.h tools.h partition.h
common_io.h single_io.h multipole.h map.h tools.h partition.h
clocks.h
# Common source files
AM_SOURCES
=
space.c runner.c queue.c task.c cell.c engine.c
\
serial_io.c timers.c debug.c scheduler.c proxy.c parallel_io.c
\
units.c common_io.c single_io.c multipole.c version.c map.c
\
kernel.c tools.c part.c partition.c
kernel.c tools.c part.c partition.c
clocks.c
# Include files for distribution, not installation.
nobase_noinst_HEADERS
=
approx_math.h atomic.h cycle.h error.h inline.h kernel.h vector.h
\
...
...
src/clocks.c
0 → 100644
View file @
12f69efd
/*******************************************************************************
* This file is part of SWIFT.
* Copyright (c) 2016 Peter W. Draper (p.w.draper@durham.ac.uk)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 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 Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
/**
* @file clocks.c
* @brief support for measuring intervals in seconds. Use cycle.h
* or timers.h for relative times.
*/
/* Config parameters. */
#include
"../config.h"
/* Standard headers. */
#include
<stdio.h>
#include
<unistd.h>
/* Local headers. */
#include
"clocks.h"
/* 0.25 of a second in nanoseconds. */
#define SLEEPTIME 250000000
/**
* @brief Get the current time.
*
* @param time the current time.
*/
void
clocks_gettime
(
struct
clockstime
*
time
)
{
#ifdef HAVE_CLOCK_GETTIME
clock_gettime
(
CLOCK_REALTIME
,
&
time
->
time
);
#else
time
->
time
=
getticks
();
#endif
}
/**
* @brief Get difference in milli-seconds between two times.
*
* @param start the start time.
* @param end the end time.
*
* @return the difference in milli-secinds.
*/
double
clocks_diff
(
struct
clockstime
*
start
,
struct
clockstime
*
end
)
{
#ifdef HAVE_CLOCK_GETTIME
struct
timespec
temp
;
if
((
end
->
time
.
tv_nsec
-
start
->
time
.
tv_nsec
)
<
0
)
{
temp
.
tv_sec
=
end
->
time
.
tv_sec
-
start
->
time
.
tv_sec
-
1
;
temp
.
tv_nsec
=
1000000000
+
end
->
time
.
tv_nsec
-
start
->
time
.
tv_nsec
;
}
else
{
temp
.
tv_sec
=
end
->
time
.
tv_sec
-
start
->
time
.
tv_sec
;
temp
.
tv_nsec
=
end
->
time
.
tv_nsec
-
start
->
time
.
tv_nsec
;
}
return
(
double
)
temp
.
tv_sec
*
1000
.
0
+
(
double
)
temp
.
tv_nsec
*
1.0E-6
;
#else
return
elapsed
(
end
->
time
,
start
-
time
)
/
clocks_cpufreq
()
*
1000
;
#endif
}
/**
* @brief Estimate the CPU frequency in Hz.
*
* The technique is either to read the value from the cpuinfo_max_freq
* file, or use a clock timed nanosleep, or use the macro CPU_TPS.
*
* Only evaulated once.
*
* @result the CPU frequency.
*/
unsigned
long
long
clocks_cpufreq
()
{
static
unsigned
long
long
cpufreq
=
0
;
/* If already evaluated return that. */
if
(
cpufreq
>
0
)
return
cpufreq
;
/* Look for the system value, if available. */
#ifdef __linux__
FILE
*
file
=
fopen
(
"/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq"
,
"r"
);
if
(
file
!=
NULL
)
{
unsigned
long
long
maxfreq
;
if
(
fscanf
(
file
,
"%llu"
,
&
maxfreq
)
==
1
)
{
cpufreq
=
maxfreq
;
}
fclose
(
file
);
}
#endif
#ifdef HAVE_CLOCK_GETTIME
/* If not try to time a nanosleep() in ticks. */
if
(
cpufreq
==
0
)
{
struct
clockstime
time1
;
struct
clockstime
time2
;
struct
timespec
sleep
;
sleep
.
tv_sec
=
0
;
sleep
.
tv_nsec
=
SLEEPTIME
;
clocks_gettime
(
&
time1
);
ticks
tic
=
getticks
();
/* Could do some calculation, but constant_tsc should protect us. */
nanosleep
(
&
sleep
,
NULL
);
clocks_gettime
(
&
time2
);
ticks
toc
=
getticks
();
double
realsleep
=
clocks_diff
(
&
time1
,
&
time2
);
cpufreq
=
(
signed
long
long
)
(
double
)(
toc
-
tic
)
*
1
.
0
/
realsleep
;
}
#endif
/* Final attempt */
#ifdef CPU_TPS
if
(
cpufreq
==
0
)
cpufreq
=
CPU_TPS
;
#endif
/* If all fails just report ticks in any times. */
if
(
cpufreq
==
0
)
cpufreq
=
1
;
return
cpufreq
;
}
src/clocks.h
0 → 100644
View file @
12f69efd
/*******************************************************************************
* This file is part of SWIFT.
* Copyright (c) 2016 Peter W. Draper (p.w.draper@durham.ac.uk)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 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 Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
#ifndef SWIFT_CLOCKS_H
#define SWIFT_CLOCKS_H
#include
<time.h>
#include
"cycle.h"
/* Struct to record a time for the clocks functions. */
struct
clockstime
{
#ifdef HAVE_CLOCK_GETTIME
struct
timespec
time
;
#else
ticks
time
;
#endif
};
void
clocks_gettime
(
struct
clockstime
*
time
);
double
clocks_diff
(
struct
clockstime
*
start
,
struct
clockstime
*
end
);
unsigned
long
long
clocks_cpufreq
();
#endif
/* SWIFT_CLOCKS_H */
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