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CPU Runtime

CPU runtime for CubeCL. It executes kernels in-process on a worker thread pool, using SIMD where the host CPU supports it. Compilation is delegated to cubecl-llvm, which JIT-compiles each kernel through LLVM; this crate owns the memory management, scheduling and execution around it.

Setup

Add cubecl with the cpu feature:

[dependencies]
cubecl = { version = "*", features = ["cpu"] }

Layout

Module	What it does
`compute::server`	The `ComputeServer` impl: allocation, launches and reads
`compute::threadpool`	Worker threads, and the per-unit dispatch of a launch
`compute::affinity`	Core topology and thread pinning, per platform
`runtime`	`CpuRuntime`, device properties and the supported type/atomic table

Tuning

Variable	Effect
`CUBECL_CPU_STACK_SIZE`	Worker thread stack size, in bytes
`CUBECL_CPU_STACK_MB`	Same, in MiB; used only when `CUBECL_CPU_STACK_SIZE` is unset

This is the stack of the worker threads the JIT'd kernels run on, so a kernel's own stack frame comes out of it. Both variables are floored at 16 MiB, and the default is 64 MiB.

Debugging

To dump the IR a kernel goes through on its way to machine code, see Debugging the compiler in cubecl-llvm.

Troubleshooting