Running multiple SDFGs with the same name using CUDA fails with DuplicateDLLError

[definelicht]

Problem

When compiling and running multiple SDFGs with the same name from the same Python executable, the SDFG is usually deleted in between (I assume by garbage collection?), which unloads the dynamic libraries.

However, when CUDA is involved, it seems that the SDFGs are not deleted even when they are no longer references by Python, which results in the loaded library to stick around. In practice, this can result in DuplicateDLLError when trying to load a new SDFG using the same name.

Expected behavior

SDFGs should be cleaned up when they are no longer referenced, and it should be possible to run multiple SDFGs with the same name from the same Python executable without explicitly deleting them.

To reproduce

Run test tests/library/blas_dot.py on the library_nodes branch, but change the initialization of dace.SDFG to always have the same name, then run the test including the cuBLAS runs.

Workaround

Name each SDFG differently, or explicitly call del my_sdfg between executions.

[tbennun]

Fixed in #114