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/*=============================================================================
This file is part of FLINT.
FLINT 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.
FLINT 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 FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2007 William Hart and David Harvey
Copyright (C) 2013 Fredrik Johansson
******************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <float.h>
#include <string.h>
#include "profiler.h"
/*
clock_last[i] is the last read clock value for clock #i.
clock_accum[i] is the total time attributed to clock #i so far.
These should not be read directly; use get_clock(i) instead.
*/
double clock_last[FLINT_NUM_CLOCKS];
double clock_accum[FLINT_NUM_CLOCKS];
void
prof_repeat(double *min, double *max, profile_target_t target, void *arg)
{
/* Number of timings that were at least DURATION_THRESHOLD microseconds */
ulong good_count = 0;
double max_time = DBL_MIN, min_time = DBL_MAX;
/* First try one loop */
ulong num_trials = 4;
double last_time;
init_clock(0);
target(arg, num_trials);
last_time = get_clock(0);
/* Loop until we have enough good times */
while (1)
{
double per_trial = last_time / num_trials;
/* If the last recorded time was long enough, record it */
if (last_time > DURATION_THRESHOLD)
{
if (good_count)
{
if (per_trial > max_time)
max_time = per_trial;
if (per_trial < min_time)
min_time = per_trial;
}
else
max_time = min_time = per_trial;
if (++good_count == 5)
{
/* We've got enough data */
break;
}
}
/*
Adjust num_trials so that the elapsed time gravitates towards
DURATION_TARGET; num_trials can be changed by a factor of
at most 25%, and must be at least 1
*/
{
double adjust_ratio;
if (last_time < 0.0001)
last_time = 0.0001;
adjust_ratio = DURATION_TARGET / last_time;
if (adjust_ratio > 1.25)
adjust_ratio = 1.25;
if (adjust_ratio < 0.75)
adjust_ratio = 0.75;
num_trials = (ulong) ceil(adjust_ratio * num_trials);
/* Just to be safe */
if (num_trials == 0)
num_trials = 1;
}
/* Run another trial */
init_clock(0);
target(arg, num_trials);
last_time = get_clock(0);
}
/* Store results */
if (min)
*min = min_time;
if (max)
*max = max_time;
}
void get_memory_usage(meminfo_t meminfo)
{
FILE * file = fopen("/proc/self/status", "r");
ulong result;
char line[128];
while (fgets(line, 128, file) != NULL)
{
result = 0;
if (strncmp(line, "VmSize:", 7) == 0)
{
flint_sscanf(line, "VmSize: %wu kB\n", &result);
meminfo->size = result;
}
else if (strncmp(line, "VmPeak:", 7) == 0)
{
flint_sscanf(line, "VmPeak: %wu kB\n", &result);
meminfo->peak = result;
}
else if (strncmp(line, "VmHWM:", 6) == 0)
{
flint_sscanf(line, "VmHWM: %wu kB\n", &result);
meminfo->hwm = result;
}
else if (strncmp(line, "VmRSS:", 6) == 0)
{
flint_sscanf(line, "VmRSS: %wu kB\n", &result);
meminfo->rss = result;
}
}
fclose(file);
}
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