| /* |
| * 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; |
| } |