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Cycles: use one instance of oneAPI gpu compiler by default 

This change removes CMake code for automatic calculation of the number
of offline device compiler instances, to hand over control to developers
instead as it incurs a rather large memory usage with around 8GB per
instance at peak.
Use SYCL_OFFLINE_COMPILER_PARALLEL_JOBS CMake variable to configure it.
This commit is contained in:
Nikita Sirgienko 2022-10-13 10:49:07 +02:00
parent c32a455605
commit 057e99d6df
1 changed files with 3 additions and 10 deletions
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13
intern/cycles/kernel/CMakeLists.txt
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@ -727,16 +727,9 @@ if(WITH_CYCLES_DEVICE_ONEAPI)
${SRC_UTIL_HEADERS}
)
set (ONEAPI_OFFLINE_COMPILER_PARALLEL_JOBS 1)
set (SYCL_OFFLINE_COMPILER_PARALLEL_JOBS 1 CACHE STRING "Number of parallel compiler instances to use for device binaries compilation (expect ~8GB peak memory usage per instance).")
if (WITH_CYCLES_ONEAPI_BINARIES)
cmake_host_system_information(RESULT AVAILABLE_MEMORY_AMOUNT QUERY AVAILABLE_PHYSICAL_MEMORY)
# Conservative value of peak consumption here, just to be fully sure that other backend compilers will have enough memory as well
set(ONEAPI_GPU_COMPILER_MEMORY_AT_PEAK_MB 8150)
math(EXPR ONEAPI_OFFLINE_COMPILER_PARALLEL_JOBS "${AVAILABLE_MEMORY_AMOUNT} / ${ONEAPI_GPU_COMPILER_MEMORY_AT_PEAK_MB}")
if (ONEAPI_OFFLINE_COMPILER_PARALLEL_JOBS LESS 1)
set(ONEAPI_OFFLINE_COMPILER_PARALLEL_JOBS 1)
endif()
message(STATUS "${ONEAPI_OFFLINE_COMPILER_PARALLEL_JOBS} instance(s) of oneAPI offline compiler will be used.")
message(STATUS "${SYCL_OFFLINE_COMPILER_PARALLEL_JOBS} instance(s) of oneAPI offline compiler will be used.")
endif()
# SYCL_CPP_FLAGS is a variable that the user can set to pass extra compiler options
set(sycl_compiler_flags
@ -747,7 +740,7 @@ if(WITH_CYCLES_DEVICE_ONEAPI)
-mllvm -inlinedefault-threshold=250
-mllvm -inlinehint-threshold=350
-fsycl-device-code-split=per_kernel
-fsycl-max-parallel-link-jobs=${ONEAPI_OFFLINE_COMPILER_PARALLEL_JOBS}
-fsycl-max-parallel-link-jobs=${SYCL_OFFLINE_COMPILER_PARALLEL_JOBS}
-shared
-DWITH_ONEAPI
-ffast-math