[SYCL][L0] Improve L0 timestamps #6006
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jandres742
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- Timer resolution is returned by L0 by default on nanoseconds. - Properly mask kernel timestamp based on valid bits. - Return ContextEndTime as end time, not as delta wrt start. Signed-off-by: Jaime Arteaga <jaime.a.arteaga.molina@intel.com>
| 1ULL) | ||
| : ((1ULL << Event->Context->Devices[0] | ||
| ->ZeDeviceProperties->kernelTimestampValidBits) - | ||
| 1ULL); |
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Please compute device first and the use it 5146-5158 to make it cleaner
| ZE_CALL(zeEventQueryKernelTimestamp, (Event->ZeEvent, &tsResult)); | ||
| uint64_t ContextStartTime = tsResult.context.kernelStart * ZeTimerFreq; | ||
| uint64_t ContextStartTime = | ||
| (tsResult.context.kernelStart & TimestampMaxValue) * ZeTimerResolution; |
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Does it mean that the Level-Zero spec guidance needs to be adjusted?
https://spec.oneapi.io/level-zero/latest/core/PROG.html#kernel-timestamp-events
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@smaslov-intel if you are referring to
const double timestampFreq = NS_IN_SEC / device_properties.timerResolution;this is valid only if you use ZE_STRUCTURE_TYPE_DEVICE_PROPERTIES_1_2
uint64_t timerResolution
[out] Returns the resolution of device timer used for profiling, timestamps, etc.
When stype==ZE_STRUCTURE_TYPE_DEVICE_PROPERTIES the units are in nanoseconds.
When stype==ZE_STRUCTURE_TYPE_DEVICE_PROPERTIES_1_2 units are in cycles/secis that what you are referring to or something else in the spec?
| const uint64_t TimestampMaxValue = | ||
| (1LL << Device->ZeDeviceProperties->kernelTimestampValidBits) - 1; | ||
| ContextEndTime += TimestampMaxValue - ContextStartTime; | ||
| ContextEndTime += TimestampMaxValue; |
smaslov-intel
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Apr 13, 2022
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Signed-off-by: Jaime Arteaga jaime.a.arteaga.molina@intel.com