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[FEA]: Support CU_LAUNCH_ATTRIBUTE_PRIORITY in LaunchConfig #2631
Description
Is this a duplicate?
- I confirmed there appear to be no duplicate issues for this request and that I agree to the Code of Conduct
Area
cuda.core
Is your feature request related to a problem? Please describe.
LaunchConfig does not expose CU_LAUNCH_ATTRIBUTE_PRIORITY, which sets the launch priority for a kernel.
Parent tracking: #496.
Describe the solution you'd like
- Users can set
CU_LAUNCH_ATTRIBUTE_PRIORITYviaLaunchConfig. - Mapping to the native launch attribute is tested.
Describe alternatives you've considered
Use cuda.bindings.driver (CUlaunchAttribute / CU_LAUNCH_ATTRIBUTE_PRIORITY) and cuLaunchKernelEx directly.
Downside: leaves cuda.core users without a first-class LaunchConfig API; they must drop to low-level bindings, manage the attribute array themselves, and lose consistency with other LaunchConfig launch attributes (is_cooperative, programmatic_stream_serialization, etc.).
Additional context
Incremental LaunchConfig attribute coverage under #496 (same approach as #1334 for programmatic_stream_serialization).
No example code in the design notes for this attribute.
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launch_attrinLaunchConfigctor #496[-][FEA]: Add support for CU_LAUNCH_ATTRIBUTE_PRIORITY in LaunchConfig[/-][+][FEA]: Support CU_LAUNCH_ATTRIBUTE_PRIORITY in LaunchConfig[/+]ichensun commentedon Aug 25, 2026
The goal is to expose CUDA's per-kernel launch priority through
cuda.core.LaunchConfig, avoiding the need for users to constructCUlaunchAttributemanually withcuda.bindings.We can add an optional
priorityfield toLaunchConfig, declaring its Cython storage in_launch_config.pyd, and maping supplied values toCU_LAUNCH_ATTRIBUTE_PRIORITYandCUlaunchAttributeValue.priorityin both native-conversion paths in_launch_config.pyx. Preserve the distinction between omitted priority and explicitpriority=0.lijinf2 commentedon Aug 25, 2026
Hi @ichensun I am on the same page that cuda.core.LaunchConfig is for when users don't set CUlaunchAttribute manually.
Adding a
priorityfield and implementation plan in cython layer look good. Please also add test cases about setter/getter and/or explore if it is possible to test a policy at runtime (looks complicated can be in a separate PR).