SYCL: Add a new path for big kernels#4952
Merged
WeiqunZhang merged 1 commit intoAMReX-Codes:developmentfrom Feb 18, 2026
Merged
SYCL: Add a new path for big kernels#4952WeiqunZhang merged 1 commit intoAMReX-Codes:developmentfrom
WeiqunZhang merged 1 commit intoAMReX-Codes:developmentfrom
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The SYCL kernel on Intel GPUs has a kernel parameter size limit of 2KB. If this limit is exceeded, a runtime error will occur when if AOT is off, and a compile time error will occur if AOT is on. Compiling with AOT is very time consuming. Thus we usually compile with AOT off, and this often results in run time errors. In this PR, we have implemented a workaround for this limitation. When the kernel parameter is too large, we explicitly copy the kernel function object to device memory. Note that CUDA has a much bigger kernel size limit. Since CUDA 12.1, the limit is 32KB for Volta and above. For HIP on AMD GPUs, the limit is 4KB.
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GitLab CI 1432492 finished with status: success. See details at https://gitlab.spack.io/amrex/amrex/-/pipelines/1432492. |
kngott
approved these changes
Feb 18, 2026
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The SYCL kernel on Intel GPUs has a kernel parameter size limit of 2KB. If this limit is exceeded, a runtime error will occur when if AOT is off, and a compile time error will occur if AOT is on. Compiling with AOT is very time consuming. Thus we usually compile with AOT off, and this often results in run time errors.
In this PR, we have implemented a workaround for this limitation. When the kernel parameter is too large, we explicitly copy the kernel function object to device memory.
Note that CUDA has a much bigger kernel size limit. Since CUDA 12.1, the limit is 32KB for Volta and above. For HIP on AMD GPUs, the limit is 4KB.