There is a feature request for SYCL_EXT_ONEAPI_GRAPH to support creating an executable graph which contains commands targetting different devices. The complete graph targetting different devices can then be submitted for execution at once.

Creating/submitting such a graph is not possible in the current API, and instead the user must compose executable graph submissions from graphs targetting the individual devices. We should discuss whether multi-device support is a requirement, and if so, iterate on the spec to make it possible.