726452720c
These commits fix issues regarding storage of tool data within libomptarget. Both libomp and libomptarget have been modified to accommodate this. We differentiate between two cases depending on the type of the target region: - merged target regions (default, without `nowait` clause): behavior remains unchanged, tool data is stored in the thread local RegionInterface class within libomptarget. - deferred target regions (using `nowait` clause): tool data is moved to `ompt_task_info_t` struct within libomp, as `RegionInterface` is thread local and its data is lost whenever another task is scheduled on the thread, which happens with deferred target regions. In the new implementation, `RegionInterface` receives pointers to `ompt_task_info_t` within libomp which are handled transparently within libomptarget. Thus, the problem of tool data getting lost when a thread receives a new task is resolved: `target_data` and `target_task_data` remain set. Another issue was the value of `task_data` which is supposed to belong to the generating task of the region according to the OpenMP standard, but instead had been set to the `task_data` of the target task itself until now. Test cases have been added which check both of these fixes. --------- Co-authored-by: Joachim <jenke@itc.rwth-aachen.de>
The LLVM/Offload Subproject
The Offload subproject aims at providing tooling, runtimes, and APIs that allow users to execute code on accelerators or other "co-processors" that may or may not match the architecture of their "host". In the long run, all kinds of targets are in scope of this effort, including but not limited to: CPUs, GPUs, FPGAs, AI/ML accelerators, distributed resources, etc.
For OpenMP offload users, the project is ready and fully usable. The final API design is still under development. More content will show up here and on our webpage soon. In the meantime, people are encouraged to participate in our meetings (see below) and check our development board as well as the discussions on Discourse.
Meetings
Every second Wednesday, 7:00 - 8:00am PT, starting Jan 24, 2024. Alternates with the OpenMP in LLVM meeting. invite.ics Meeting Minutes and Agenda