| 1 | /* $Id: tstPrfRT.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT testcase - profile some of the important functions.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2024 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include <iprt/initterm.h>
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| 42 | #include <iprt/time.h>
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| 43 | #include <iprt/log.h>
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| 44 | #include <iprt/test.h>
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| 45 | #include <iprt/thread.h>
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| 46 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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| 47 | # include <iprt/asm-amd64-x86.h>
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| 48 | #endif
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| 49 |
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| 50 |
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| 51 | /*********************************************************************************************************************************
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| 52 | * Internal Functions *
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| 53 | *********************************************************************************************************************************/
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| 54 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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| 55 | DECLASM(void) tstRTPRfAMemoryAccess(void);
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| 56 | DECLASM(void) tstRTPRfARegisterAccess(void);
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| 57 | DECLASM(void) tstRTPRfAMemoryUnalignedAccess(void);
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| 58 | #endif
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| 59 |
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| 60 |
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| 61 | /*********************************************************************************************************************************
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| 62 | * Global Variables *
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| 63 | *********************************************************************************************************************************/
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| 64 | static RTTEST g_hTest;
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| 65 |
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| 66 |
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| 67 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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| 68 |
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| 69 | static void PrintResult(uint64_t u64Ticks, uint64_t u64MaxTicks, uint64_t u64MinTicks, unsigned cTimes, const char *pszOperation)
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| 70 | {
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| 71 | //RTTestPrintf(g_hTest, RTTESTLVL_ALWAYS,
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| 72 | // "%-32s %5lld / %5lld / %5lld ticks per call (%u calls %lld ticks)\n",
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| 73 | // pszOperation, u64MinTicks, u64Ticks / (uint64_t)cTimes, u64MaxTicks, cTimes, u64Ticks);
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| 74 | //RTTestValueF(g_hTest, u64MinTicks, RTTESTUNIT_NONE, "%s min ticks", pszOperation);
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| 75 | RTTestValueF(g_hTest, u64Ticks / (uint64_t)cTimes, RTTESTUNIT_NONE, "%s avg ticks", pszOperation);
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| 76 | //RTTestValueF(g_hTest, u64MaxTicks, RTTESTUNIT_NONE, "%s max ticks", pszOperation);
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| 77 | RT_NOREF_PV(u64MaxTicks); RT_NOREF_PV(u64MinTicks);
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| 78 | }
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| 79 |
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| 80 | # define ITERATE(preexpr, expr, postexpr, cIterations) \
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| 81 | AssertCompile(((cIterations) % 8) == 0); \
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| 82 | /* Min and max value. */ \
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| 83 | for (i = 0, u64MinTS = UINT64_MAX, u64MaxTS = 0; i < (cIterations); i++) \
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| 84 | { \
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| 85 | { preexpr } \
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| 86 | uint64_t u64StartTS = ASMReadTSC(); \
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| 87 | { expr } \
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| 88 | uint64_t u64ElapsedTS = ASMReadTSC() - u64StartTS; \
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| 89 | { postexpr } \
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| 90 | if (u64ElapsedTS > u64MinTS * 32) \
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| 91 | { \
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| 92 | i--; \
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| 93 | continue; \
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| 94 | } \
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| 95 | if (u64ElapsedTS < u64MinTS) \
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| 96 | u64MinTS = u64ElapsedTS; \
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| 97 | if (u64ElapsedTS > u64MaxTS) \
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| 98 | u64MaxTS = u64ElapsedTS; \
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| 99 | } \
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| 100 | { \
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| 101 | /* Calculate a good average value (may be smaller than min). */ \
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| 102 | i = (cIterations); \
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| 103 | AssertRelease((i % 8) == 0); \
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| 104 | { preexpr } \
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| 105 | uint64_t u64StartTS = ASMReadTSC(); \
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| 106 | while (i != 0) \
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| 107 | { \
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| 108 | { expr } \
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| 109 | { expr } \
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| 110 | { expr } \
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| 111 | { expr } \
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| 112 | { expr } \
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| 113 | { expr } \
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| 114 | { expr } \
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| 115 | { expr } \
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| 116 | i -= 8; \
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| 117 | } \
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| 118 | u64TotalTS = ASMReadTSC() - u64StartTS; \
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| 119 | { postexpr } \
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| 120 | i = (cIterations); \
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| 121 | }
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| 122 |
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| 123 | #else /* !AMD64 && !X86 */
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| 124 |
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| 125 | void PrintResult(uint64_t cNs, uint64_t cNsMax, uint64_t cNsMin, unsigned cTimes, const char *pszOperation)
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| 126 | {
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| 127 | RT_NOREF(cNsMax, cNsMin);
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| 128 | //RTTestPrintf(g_hTest, RTTESTLVL_ALWAYS,
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| 129 | // "%-32s %5lld / %5lld / %5lld ns per call (%u calls %lld ns)\n",
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| 130 | // pszOperation, cNsMin, cNs / (uint64_t)cTimes, cNsMax, cTimes, cNs);
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| 131 | //RTTestValueF(g_hTest, cNsMin, RTTESTUNIT_NS_PER_CALL, "%s min", pszOperation);
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| 132 | RTTestValueF(g_hTest, cNs / (uint64_t)cTimes, RTTESTUNIT_NS_PER_CALL, "%s avg", pszOperation);
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| 133 | //RTTestValueF(g_hTest, cNsMax, RTTESTUNIT_NS_PER_CALL, "%s max", pszOperation);
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| 134 | }
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| 135 |
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| 136 | # define ITERATE(preexpr, expr, postexpr, cIterations) \
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| 137 | for (i = 0, u64TotalTS = 0, u64MinTS = UINT64_MAX, u64MaxTS = 0; i < (cIterations); i++) \
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| 138 | { \
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| 139 | { preexpr } \
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| 140 | uint64_t u64StartTS = RTTimeNanoTS(); \
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| 141 | { expr } \
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| 142 | uint64_t u64ElapsedTS = RTTimeNanoTS() - u64StartTS; \
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| 143 | { postexpr } \
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| 144 | if (u64ElapsedTS > u64MinTS * 32) \
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| 145 | { \
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| 146 | i--; \
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| 147 | continue; \
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| 148 | } \
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| 149 | if (u64ElapsedTS < u64MinTS) \
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| 150 | u64MinTS = u64ElapsedTS; \
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| 151 | if (u64ElapsedTS > u64MaxTS) \
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| 152 | u64MaxTS = u64ElapsedTS; \
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| 153 | u64TotalTS += u64ElapsedTS; \
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| 154 | }
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| 155 |
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| 156 | #endif /* !AMD64 && !X86 */
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| 157 |
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| 158 |
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| 159 | int main(int argc, char **argv)
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| 160 | {
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| 161 | uint64_t u64TotalTS;
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| 162 | uint64_t u64MinTS;
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| 163 | uint64_t u64MaxTS;
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| 164 | uint32_t i;
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| 165 |
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| 166 | RTEXITCODE rcExit = RTTestInitExAndCreate(argc, &argv, argc == 2 ? RTR3INIT_FLAGS_SUPLIB : 0, "tstRTPrf", &g_hTest);
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| 167 | if (rcExit != RTEXITCODE_SUCCESS)
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| 168 | return rcExit;
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| 169 | RTTestBanner(g_hTest);
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| 170 |
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| 171 | /*
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| 172 | * RTTimeNanoTS, RTTimeProgramNanoTS, RTTimeMilliTS, and RTTimeProgramMilliTS.
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| 173 | */
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| 174 | ITERATE(RT_NOTHING, RTTimeNanoTS();, RT_NOTHING, _32M);
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| 175 | PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTTimeNanoTS");
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| 176 |
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| 177 | ITERATE(RT_NOTHING, RTTimeProgramNanoTS();, RT_NOTHING, UINT32_C(1000000));
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| 178 | PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTTimeProgramNanoTS");
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| 179 |
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| 180 | ITERATE(RT_NOTHING, RTTimeMilliTS();, RT_NOTHING, UINT32_C(1000000));
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| 181 | PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTTimeMilliTS");
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| 182 |
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| 183 | ITERATE(RT_NOTHING, RTTimeProgramMilliTS();, RT_NOTHING, UINT32_C(1000000));
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| 184 | PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTTimeProgramMilliTS");
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| 185 |
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| 186 | /*
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| 187 | * RTTimeNow
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| 188 | */
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| 189 | RTTIMESPEC Time;
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| 190 | ITERATE(RT_NOTHING, RTTimeNow(&Time);, RT_NOTHING, UINT32_C(1000000));
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| 191 | PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTTimeNow");
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| 192 |
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| 193 | /*
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| 194 | * RTLogDefaultInstance()
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| 195 | */
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| 196 | ITERATE(RT_NOTHING, RTLogDefaultInstance();, RT_NOTHING, UINT32_C(1000000));
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| 197 | PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTLogDefaultInstance");
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| 198 |
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| 199 | /*
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| 200 | * RTThreadSelf and RTThreadNativeSelf
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| 201 | */
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| 202 | ITERATE(RT_NOTHING, RTThreadSelf();, RT_NOTHING, UINT32_C(1000000));
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| 203 | PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTThreadSelf");
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| 204 |
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| 205 | ITERATE(RT_NOTHING, RTThreadNativeSelf();, RT_NOTHING, UINT32_C(1000000));
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| 206 | PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTThreadNativeSelf");
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| 207 |
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| 208 | #if defined(RT_ARCH_X86) || defined(RT_ARCH_AMD64)
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| 209 | /*
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| 210 | * Registers vs stack.
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| 211 | */
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| 212 | ITERATE(RT_NOTHING, tstRTPRfARegisterAccess();, RT_NOTHING, UINT32_C(1000));
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| 213 | uint64_t const cRegTotal = u64TotalTS;
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| 214 | //PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "Register only algorithm");
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| 215 |
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| 216 | ITERATE(RT_NOTHING, tstRTPRfAMemoryAccess();, RT_NOTHING, UINT32_C(1000));
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| 217 | uint64_t const cMemTotal = u64TotalTS;
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| 218 | //PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "Memory only algorithm");
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| 219 |
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| 220 | ITERATE(RT_NOTHING, tstRTPRfAMemoryUnalignedAccess();, RT_NOTHING, UINT32_C(1000));
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| 221 | uint64_t const cMemUnalignedTotal = u64TotalTS;
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| 222 | //PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "Memory only algorithm");
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| 223 |
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| 224 | uint64_t const cSlower100 = cMemTotal * 100 / cRegTotal;
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| 225 | RTTestValue(g_hTest, "Memory instead of registers slowdown", cSlower100, RTTESTUNIT_PCT);
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| 226 | uint64_t const cUnalignedSlower100 = cMemUnalignedTotal * 100 / cRegTotal;
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| 227 | RTTestValue(g_hTest, "Unaligned memory instead of registers slowdown", cUnalignedSlower100, RTTESTUNIT_PCT);
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| 228 | #endif
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| 229 |
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| 230 | return RTTestSummaryAndDestroy(g_hTest);
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| 231 | }
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