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wall_clock: Increase precision requirements
We are providing a conversion to nanoseconds in NativeClock, which is more precise than the GPU tick.
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@ -56,12 +56,12 @@ std::unique_ptr<WallClock> CreateOptimalClock() {
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#ifdef ARCHITECTURE_x86_64
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#ifdef ARCHITECTURE_x86_64
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const auto& caps = GetCPUCaps();
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const auto& caps = GetCPUCaps();
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if (caps.invariant_tsc && caps.tsc_frequency >= WallClock::GPUTickFreq) {
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if (caps.invariant_tsc && caps.tsc_frequency >= std::nano::den) {
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return std::make_unique<X64::NativeClock>(caps.tsc_frequency);
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return std::make_unique<X64::NativeClock>(caps.tsc_frequency);
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} else {
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} else {
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// Fallback to StandardWallClock if the hardware TSC
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// Fallback to StandardWallClock if the hardware TSC
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// - Is not invariant
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// - Is not invariant
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// - Is not more precise than GPUTickFreq
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// - Is not more precise than 1 GHz (1ns resolution)
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return std::make_unique<StandardWallClock>();
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return std::make_unique<StandardWallClock>();
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}
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}
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#else
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#else
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