AuroraSupport/AuroraRuntime
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[*] Rework SMT yielding

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This commit is contained in:
Reece Wilson 2023-08-27 19:43:21 +01:00
parent 6a3b278ea0
commit 8fe2619673
3 changed files with 14 additions and 22 deletions
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8
Include/Aurora/Runtime.hpp
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@ -346,10 +346,10 @@ namespace Aurora
bool bNoThreadNames { false };
bool bPlatformIsSMPProcessorOptimized { true }; // Whether to attempt to using mm_pause or similar before yielding into the kernel
AuUInt8 uSpinLoopPowerA { 3 }; // Nudgable spinloop power. This is our local userland niceness factor; where 1 << n is the amount of smt-yield instructions to stall for
AuUInt8 uSpinLoopPowerA { 40 }; // Nudgable spinloop power. This is our local userland niceness factor
// This is comparable to Win32's SetCriticalSectionSpinCount applied across every single AuThreadPrimitives try-lock and lock.
// Adjust this value to compensate for longer critical sections when context switching isn't preferrable.
AuUInt8 uSpinLoopLinearBit { 6 };
AuUInt8 uSpinLoopLinearBit { 1 };
AuUInt64 bEnableAggressiveScheduling : 1 { false };
AuUInt64 bEnableAgrSchedulingRatelimit : 1 { true };
AuUInt64 bPreferNt51XpMutexesOver8 : 1 { false };
@ -358,7 +358,7 @@ namespace Aurora
AuUInt64 bPreferNtCondvarOlderWinSpin : 1 { true };
AuUInt64 bPreferNtSemaphoreSpinTryLock : 1 { true };
AuUInt64 bPreferNtMutexSpinTryLock : 1 { true };
AuUInt64 bPreferNtCondMutexSpinTryLock : 1 { true };
AuUInt64 bPreferNtCondMutexSpinTryLock : 1 { false };
AuUInt64 bPreferLinuxSemaphoreSpinTryLock : 1 { true };
AuUInt64 bPreferLinuxMutexSpinTryLock : 1 { true };
AuUInt64 bPreferLinuxCondMutexSpinTryLock : 1 { true };
@ -369,6 +369,8 @@ namespace Aurora
AuUInt64 uUWPNanosecondEmulationMaxYields : 7 { 12 };
AuUInt64 bForceEnableAdaptiveSpin : 1 { false };
AuUInt64 bPreferLinuxAdaptiveSpin : 1 { true };
AuUInt64 bPreferOldWin32AdaptiveSpin : 1 { true };
AuUInt64 bPreferNewWin32AdaptiveSpin : 1 { true };
AuUInt64 uAdaptiveSpinCUCnt0 : 4 { 0 };
AuUInt64 uAdaptiveSpinCUCnt4 : 4 { 2 };
AuUInt64 uAdaptiveSpinCUCnt8 : 4 { 3 };

9
Source/Threading/Primitives/SMTYield.cpp
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@ -35,7 +35,7 @@ namespace Aurora::Threading
return 16;
}
uCount = 1u << AuUInt32(gRuntimeConfig.threadingConfig.uSpinLoopPowerA);
uCount = AuUInt32(gRuntimeConfig.threadingConfig.uSpinLoopPowerA);
if (gHasThreadLocalTimeout)
{
uCount += 1u << AuUInt32(tlsSpinCountLocal);
@ -70,7 +70,6 @@ namespace Aurora::Threading::Primitives
{
auto uCores = AuHwInfo::GetCPUInfo().uThreads;
gSpinLinearPart = gRuntimeConfig.threadingConfig.uSpinLoopLinearBit;
gUseFutexRWLock = gRuntimeConfig.threadingConfig.bPreferFutexRWLock &&
IsWaitOnRecommended();
@ -121,7 +120,11 @@ namespace Aurora::Threading::Primitives
#else
if (AuSwInfo::IsWindows10OrGreater())
{
gRuntimeConfig.threadingConfig.bForceEnableAdaptiveSpin = true;
gRuntimeConfig.threadingConfig.bForceEnableAdaptiveSpin = gRuntimeConfig.threadingConfig.bPreferNewWin32AdaptiveSpin;
}
else
{
gRuntimeConfig.threadingConfig.bForceEnableAdaptiveSpin = gRuntimeConfig.threadingConfig.bPreferOldWin32AdaptiveSpin;
}
#endif
}

19
Source/Threading/Primitives/SMTYield.hpp
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@ -17,7 +17,6 @@ namespace Aurora::Threading::Primitives
{
inline AuUInt32 gSpinAdaptiveThreshold {};
inline AuUInt32 gSpinAdaptiveCurrentCount {};
inline AuUInt32 gSpinLinearPart {};
inline AuUInt32 gUseFutexRWLock {};
@ -54,15 +53,9 @@ namespace Aurora::Threading::Primitives
if (uNow <= gSpinAdaptiveThreshold)
{
int loops = (1 << spin);
auto uLinear = gSpinLinearPart;
int loops = spin;
while (loops > 0)
{
for (AU_ITERATE_N(i, uLinear))
{
SMPPause();
}
loops -= 1;
if (callback())
@ -95,7 +88,7 @@ namespace Aurora::Threading::Primitives
}
else
{
int loops = (1 << spin) / 3;
int loops = (spin) / 3;
while (loops > 0)
{
SMPPause();
@ -114,15 +107,9 @@ namespace Aurora::Threading::Primitives
}
else
{
int loops = (1 << spin);
auto uLinear = gSpinLinearPart;
int loops = spin;
while (loops > 0)
{
for (AU_ITERATE_N(i, uLinear))
{
SMPPause();
}
loops -= 1;
if (callback())