CUDA Python 11.6.0 Release notes¶

Released on Januray 12, 2022

Highlights¶

Support CUDA Toolkit 11.6
Support Profiler APIs
Support Graphic APIs (EGL, GL, VDPAU)
Support changing default stream
Relaxed primitive interoperability

Default stream¶

Changing default stream to Per-Thread-Default-Stream (PTDS) is done through environment variable before execution:

export CUDA_PYTHON_CUDA_PER_THREAD_DEFAULT_STREAM=1

When set to 1, the default stream is the per-thread default stream. When set to 0, the default stream is the legacy default stream. This defaults to 0, for the legacy default stream. See Stream Synchronization Behavior for an explanation of the legacy and per-thread default streams.

Primitive interoperability¶

APIs accepting classes that wrap a primitive value are now interoperable with the underlining value.

Example 1: Structure member handles interoperability.

>>> waitParams = cuda.CUstreamMemOpWaitValueParams_st()
>>> waitParams.value64 = 1
>>> waitParams.value64
<cuuint64_t 1>
>>> waitParams.value64 = cuda.cuuint64_t(2)
>>> waitParams.value64
<cuuint64_t 2>

Example 2: Function signature handles interoperability.

>>> cudart.cudaStreamQuery(cudart.cudaStreamNonBlocking)
(<cudaError_t.cudaSuccess: 0>,)
>>> cudart.cudaStreamQuery(cudart.cudaStream_t(cudart.cudaStreamNonBlocking))
(<cudaError_t.cudaSuccess: 0>,)

Limitations¶

CUDA Functions Not Supported in this Release¶

Symbol APIs
- cudaGraphExecMemcpyNodeSetParamsFromSymbol
- cudaGraphExecMemcpyNodeSetParamsToSymbol
- cudaGraphAddMemcpyNodeToSymbol
- cudaGraphAddMemcpyNodeFromSymbol
- cudaGraphMemcpyNodeSetParamsToSymbol
- cudaGraphMemcpyNodeSetParamsFromSymbol
- cudaMemcpyToSymbol
- cudaMemcpyFromSymbol
- cudaMemcpyToSymbolAsync
- cudaMemcpyFromSymbolAsync
- cudaGetSymbolAddress
- cudaGetSymbolSize
- cudaGetFuncBySymbol
Launch Options
- cudaLaunchKernel
- cudaLaunchCooperativeKernel
- cudaLaunchCooperativeKernelMultiDevice
cudaSetValidDevices
cudaVDPAUSetVDPAUDevice

Note

Deprecated APIs are removed from tracking