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GPU CMake: Add option to override deterministic mode #14827

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Merged
davidrohr merged 2 commits into from
Nov 17, 2025
Merged

GPU CMake: Add option to override deterministic mode #14827

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3aeb22c
GPU CMake: Add option to override deterministic mode
davidrohr Nov 17, 2025
2764e22
GPU: If deterministic compile time option set, default for determinis…
davidrohr Nov 17, 2025
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4 changes: 4 additions & 0 deletions GPU/GPUTracking/Base/GPUReconstruction.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -264,7 +264,11 @@ int32_t GPUReconstruction::InitPhaseBeforeDevice()
mProcessingSettings->recoTaskTiming = true;
}
if (GetProcessingSettings().deterministicGPUReconstruction == -1) {
#ifdef GPUCA_DETERMINISTIC_MODE
mProcessingSettings->deterministicGPUReconstruction = 1;
#else
mProcessingSettings->deterministicGPUReconstruction = GetProcessingSettings().debugLevel >= 6;
#endif
}
if (GetProcessingSettings().deterministicGPUReconstruction) {
#ifndef GPUCA_DETERMINISTIC_MODE
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2 changes: 1 addition & 1 deletion GPU/GPUTracking/Definitions/GPUSettingsList.h
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Expand Up @@ -306,7 +306,7 @@ AddOption(debugMask, uint32_t, (1 << 18) - 1, "debugMask", 0, "Mask for debug ou
AddOption(debugLogSuffix, std::string, "", "debugSuffix", 0, "Suffix for debug log files with --debug 6")
AddOption(serializeGPU, int8_t, 0, "", 0, "Synchronize after each kernel call (bit 1) and DMA transfer (bit 2) and identify failures")
AddOption(recoTaskTiming, bool, 0, "", 0, "Perform summary timing after whole reconstruction tasks")
AddOption(deterministicGPUReconstruction, int32_t, -1, "", 0, "Make CPU and GPU debug output comparable (sort / skip concurrent parts), -1 = automatic if debugLevel >= 6", def(1))
AddOption(deterministicGPUReconstruction, int32_t, -1, "", 0, "Make CPU and GPU debug output comparable (sort / skip concurrent parts), -1 = automatic if debugLevel >= 6 or deterministic compile flag set", def(1))
AddOption(showOutputStat, bool, false, "", 0, "Print some track output statistics")
AddOption(runCompressionStatistics, bool, false, "compressionStat", 0, "Run statistics and verification for cluster compression")
AddOption(resetTimers, int8_t, 1, "", 0, "Reset timers every event")
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5 changes: 4 additions & 1 deletion dependencies/FindO2GPU.cmake
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Expand Up @@ -10,7 +10,7 @@
# or submit itself to any jurisdiction.

# NOTE!!!! - Whenever this file is changed, move it over to alidist/resources
# FindO2GPU.cmake Version 5
# FindO2GPU.cmake Version 6

if(NOT DEFINED ENABLE_CUDA)
set(ENABLE_CUDA "AUTO")
Expand Down Expand Up @@ -71,6 +71,9 @@ endfunction()
STRING(REGEX REPLACE "\-std=[^ ]*" "" O2_GPU_CMAKE_CXX_FLAGS_NOSTD "${CMAKE_CXX_FLAGS}")

# ================================== Fast Math / Deterministic Mode ==================================
if(DEFINED ENV{O2_OVERRIDE_GPUCA_DETERMINISTIC_MODE})
set(GPUCA_DETERMINISTIC_MODE $ENV{O2_OVERRIDE_GPUCA_DETERMINISTIC_MODE})
endif()
# set(GPUCA_DETERMINISTIC_MODE WHOLEO2) # Override
set(GPUCA_DETERMINISTIC_MODE_MAP_OFF 0)
set(GPUCA_DETERMINISTIC_MODE_MAP_NO_FAST_MATH 1) # No -ffast-math and similar compile flags for GPU folder
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