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Merge pull request #11173 from Morph1984/atleast_nanosecond_precision

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wall_clock: Increase precision requirements
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liamwhite 2023-07-31 09:11:11 -04:00 committed by GitHub
parent e2623d64de bb4e676155
commit 1ed6e3e51d
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1 changed files with 2 additions and 2 deletions
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src/common/wall_clock.cpp
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@ -56,12 +56,12 @@ std::unique_ptr<WallClock> CreateOptimalClock() {
#ifdef ARCHITECTURE_x86_64 #ifdef ARCHITECTURE_x86_64
const auto& caps = GetCPUCaps(); const auto& caps = GetCPUCaps();
if (caps.invariant_tsc && caps.tsc_frequency >= WallClock::GPUTickFreq) { if (caps.invariant_tsc && caps.tsc_frequency >= std::nano::den) {
return std::make_unique<X64::NativeClock>(caps.tsc_frequency); return std::make_unique<X64::NativeClock>(caps.tsc_frequency);
} else { } else {
// Fallback to StandardWallClock if the hardware TSC // Fallback to StandardWallClock if the hardware TSC
// - Is not invariant // - Is not invariant
// - Is not more precise than GPUTickFreq // - Is not more precise than 1 GHz (1ns resolution)
return std::make_unique<StandardWallClock>(); return std::make_unique<StandardWallClock>();
} }
#else #else