/* * 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; }