138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/*
|
|
* Copyright (C) 2009 VMware, Inc. All Rights Reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included
|
|
* in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* VMWARE BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
|
|
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
/**
|
|
* Common perf code. This should be re-usable with other APIs.
|
|
*/
|
|
|
|
#include "common.h"
|
|
#include "glmain.h"
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stdarg.h>
|
|
|
|
#if defined(_MSC_VER)
|
|
#define snprintf _snprintf
|
|
#endif
|
|
|
|
|
|
/* Need to add a fflush windows console with mingw, otherwise nothing
|
|
* shows up until program exit. May want to add logging here.
|
|
*/
|
|
void
|
|
perf_printf(const char *format, ...)
|
|
{
|
|
va_list ap;
|
|
va_start(ap, format);
|
|
|
|
fflush(stdout);
|
|
vfprintf(stdout, format, ap);
|
|
fflush(stdout);
|
|
|
|
va_end(ap);
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Run function 'f' for enough iterations to reach a steady state.
|
|
* Return the rate (iterations/second).
|
|
*/
|
|
double
|
|
PerfMeasureRate(PerfRateFunc f)
|
|
{
|
|
const double minDuration = 1.0;
|
|
double rate = 0.0, prevRate = 0.0;
|
|
unsigned subiters;
|
|
|
|
/* Compute initial number of iterations to try.
|
|
* If the test function is pretty slow this helps to avoid
|
|
* extraordarily long run times.
|
|
*/
|
|
subiters = 2;
|
|
{
|
|
const double t0 = PerfGetTime();
|
|
double t1;
|
|
do {
|
|
f(subiters); /* call the rendering function */
|
|
t1 = PerfGetTime();
|
|
subiters *= 2;
|
|
} while (t1 - t0 < 0.1 * minDuration);
|
|
}
|
|
/*perf_printf("initial subIters = %u\n", subiters);*/
|
|
|
|
while (1) {
|
|
const double t0 = PerfGetTime();
|
|
unsigned iters = 0;
|
|
double t1;
|
|
|
|
do {
|
|
f(subiters); /* call the rendering function */
|
|
t1 = PerfGetTime();
|
|
iters += subiters;
|
|
} while (t1 - t0 < minDuration);
|
|
|
|
rate = iters / (t1 - t0);
|
|
|
|
if (0)
|
|
perf_printf("prevRate %f rate %f ratio %f iters %u\n",
|
|
prevRate, rate, rate/prevRate, iters);
|
|
|
|
/* Try and speed the search up by skipping a few steps:
|
|
*/
|
|
if (rate > prevRate * 1.6)
|
|
subiters *= 8;
|
|
else if (rate > prevRate * 1.2)
|
|
subiters *= 4;
|
|
else if (rate > prevRate * 1.05)
|
|
subiters *= 2;
|
|
else
|
|
break;
|
|
|
|
prevRate = rate;
|
|
}
|
|
|
|
if (0)
|
|
perf_printf("%s returning iters %u rate %f\n", __FUNCTION__, subiters, rate);
|
|
return rate;
|
|
}
|
|
|
|
|
|
/* Note static buffer, can only use once per printf.
|
|
*/
|
|
const char *
|
|
PerfHumanFloat( double d )
|
|
{
|
|
static char buf[80];
|
|
|
|
if (d > 1000000000.0)
|
|
snprintf(buf, sizeof(buf), "%.1f billion", d / 1000000000.0);
|
|
else if (d > 1000000.0)
|
|
snprintf(buf, sizeof(buf), "%.1f million", d / 1000000.0);
|
|
else if (d > 1000.0)
|
|
snprintf(buf, sizeof(buf), "%.1f thousand", d / 1000.0);
|
|
else
|
|
snprintf(buf, sizeof(buf), "%.1f", d);
|
|
|
|
return buf;
|
|
}
|