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/* $Id: tstPrfRT.cpp $ */
/** @file
* IPRT testcase - profile some of the important functions.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program 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, in version 3 of the
* License.
*
* This program 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 this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/initterm.h>
#include <iprt/time.h>
#include <iprt/log.h>
#include <iprt/test.h>
#include <iprt/thread.h>
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
# include <iprt/asm-amd64-x86.h>
#endif
/*********************************************************************************************************************************
* Internal Functions *
*********************************************************************************************************************************/
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
DECLASM(void) tstRTPRfAMemoryAccess(void);
DECLASM(void) tstRTPRfARegisterAccess(void);
DECLASM(void) tstRTPRfAMemoryUnalignedAccess(void);
#endif
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
static RTTEST g_hTest;
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
void PrintResult(uint64_t u64Ticks, uint64_t u64MaxTicks, uint64_t u64MinTicks, unsigned cTimes, const char *pszOperation)
{
//RTTestPrintf(g_hTest, RTTESTLVL_ALWAYS,
// "%-32s %5lld / %5lld / %5lld ticks per call (%u calls %lld ticks)\n",
// pszOperation, u64MinTicks, u64Ticks / (uint64_t)cTimes, u64MaxTicks, cTimes, u64Ticks);
//RTTestValueF(g_hTest, u64MinTicks, RTTESTUNIT_NONE, "%s min ticks", pszOperation);
RTTestValueF(g_hTest, u64Ticks / (uint64_t)cTimes, RTTESTUNIT_NONE, "%s avg ticks", pszOperation);
//RTTestValueF(g_hTest, u64MaxTicks, RTTESTUNIT_NONE, "%s max ticks", pszOperation);
RT_NOREF_PV(u64MaxTicks); RT_NOREF_PV(u64MinTicks);
}
# define ITERATE(preexpr, expr, postexpr, cIterations) \
AssertCompile(((cIterations) % 8) == 0); \
/* Min and max value. */ \
for (i = 0, u64MinTS = UINT64_MAX, u64MaxTS = 0; i < (cIterations); i++) \
{ \
{ preexpr } \
uint64_t u64StartTS = ASMReadTSC(); \
{ expr } \
uint64_t u64ElapsedTS = ASMReadTSC() - u64StartTS; \
{ postexpr } \
if (u64ElapsedTS > u64MinTS * 32) \
{ \
i--; \
continue; \
} \
if (u64ElapsedTS < u64MinTS) \
u64MinTS = u64ElapsedTS; \
if (u64ElapsedTS > u64MaxTS) \
u64MaxTS = u64ElapsedTS; \
} \
{ \
/* Calculate a good average value (may be smaller than min). */ \
i = (cIterations); \
AssertRelease((i % 8) == 0); \
{ preexpr } \
uint64_t u64StartTS = ASMReadTSC(); \
while (i != 0) \
{ \
{ expr } \
{ expr } \
{ expr } \
{ expr } \
{ expr } \
{ expr } \
{ expr } \
{ expr } \
i -= 8; \
} \
u64TotalTS = ASMReadTSC() - u64StartTS; \
{ postexpr } \
i = (cIterations); \
}
#else /* !AMD64 && !X86 */
void PrintResult(uint64_t cNs, uint64_t cNsMax, uint64_t cNsMin, unsigned cTimes, const char *pszOperation)
{
//RTTestPrintf(g_hTest, RTTESTLVL_ALWAYS,
// "%-32s %5lld / %5lld / %5lld ns per call (%u calls %lld ns)\n",
// pszOperation, cNsMin, cNs / (uint64_t)cTimes, cNsMax, cTimes, cNs);
//RTTestValueF(g_hTest, cNsMin, RTTESTUNIT_NS_PER_CALL, "%s min", pszOperation);
RTTestValueF(g_hTest, cNs / (uint64_t)cTimes, RTTESTUNIT_NS_PER_CALL, "%s avg", pszOperation);
//RTTestValueF(g_hTest, cNsMax, RTTESTUNIT_NS_PER_CALL, "%s max", pszOperation);
}
# define ITERATE(preexpr, expr, postexpr, cIterations) \
for (i = 0, u64TotalTS = 0, u64MinTS = UINT64_MAX, u64MaxTS = 0; i < (cIterations); i++) \
{ \
{ preexpr } \
uint64_t u64StartTS = RTTimeNanoTS(); \
{ expr } \
uint64_t u64ElapsedTS = RTTimeNanoTS() - u64StartTS; \
{ postexpr } \
if (u64ElapsedTS > u64MinTS * 32) \
{ \
i--; \
continue; \
} \
if (u64ElapsedTS < u64MinTS) \
u64MinTS = u64ElapsedTS; \
if (u64ElapsedTS > u64MaxTS) \
u64MaxTS = u64ElapsedTS; \
u64TotalTS += u64ElapsedTS; \
}
#endif /* !AMD64 && !X86 */
int main(int argc, char **argv)
{
uint64_t u64TotalTS;
uint64_t u64MinTS;
uint64_t u64MaxTS;
uint32_t i;
RTEXITCODE rcExit = RTTestInitExAndCreate(argc, &argv, argc == 2 ? RTR3INIT_FLAGS_SUPLIB : 0, "tstRTPrf", &g_hTest);
if (rcExit != RTEXITCODE_SUCCESS)
return rcExit;
RTTestBanner(g_hTest);
/*
* RTTimeNanoTS, RTTimeProgramNanoTS, RTTimeMilliTS, and RTTimeProgramMilliTS.
*/
ITERATE(RT_NOTHING, RTTimeNanoTS();, RT_NOTHING, _32M);
PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTTimeNanoTS");
ITERATE(RT_NOTHING, RTTimeProgramNanoTS();, RT_NOTHING, UINT32_C(1000000));
PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTTimeProgramNanoTS");
ITERATE(RT_NOTHING, RTTimeMilliTS();, RT_NOTHING, UINT32_C(1000000));
PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTTimeMilliTS");
ITERATE(RT_NOTHING, RTTimeProgramMilliTS();, RT_NOTHING, UINT32_C(1000000));
PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTTimeProgramMilliTS");
/*
* RTTimeNow
*/
RTTIMESPEC Time;
ITERATE(RT_NOTHING, RTTimeNow(&Time);, RT_NOTHING, UINT32_C(1000000));
PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTTimeNow");
/*
* RTLogDefaultInstance()
*/
ITERATE(RT_NOTHING, RTLogDefaultInstance();, RT_NOTHING, UINT32_C(1000000));
PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTLogDefaultInstance");
/*
* RTThreadSelf and RTThreadNativeSelf
*/
ITERATE(RT_NOTHING, RTThreadSelf();, RT_NOTHING, UINT32_C(1000000));
PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTThreadSelf");
ITERATE(RT_NOTHING, RTThreadNativeSelf();, RT_NOTHING, UINT32_C(1000000));
PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "RTThreadNativeSelf");
#if defined(RT_ARCH_X86) || defined(RT_ARCH_AMD64)
/*
* Registers vs stack.
*/
ITERATE(RT_NOTHING, tstRTPRfARegisterAccess();, RT_NOTHING, UINT32_C(1000));
uint64_t const cRegTotal = u64TotalTS;
//PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "Register only algorithm");
ITERATE(RT_NOTHING, tstRTPRfAMemoryAccess();, RT_NOTHING, UINT32_C(1000));
uint64_t const cMemTotal = u64TotalTS;
//PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "Memory only algorithm");
ITERATE(RT_NOTHING, tstRTPRfAMemoryUnalignedAccess();, RT_NOTHING, UINT32_C(1000));
uint64_t const cMemUnalignedTotal = u64TotalTS;
//PrintResult(u64TotalTS, u64MaxTS, u64MinTS, i, "Memory only algorithm");
uint64_t const cSlower100 = cMemTotal * 100 / cRegTotal;
RTTestValue(g_hTest, "Memory instead of registers slowdown", cSlower100, RTTESTUNIT_PCT);
uint64_t const cUnalignedSlower100 = cMemUnalignedTotal * 100 / cRegTotal;
RTTestValue(g_hTest, "Unaligned memory instead of registers slowdown", cUnalignedSlower100, RTTESTUNIT_PCT);
#endif
return RTTestSummaryAndDestroy(g_hTest);
}
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