Allocate cuda stream `let_value`'s `__op_state_` in pinned memory
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
Research direction
Read issues #953 and #970 first to understand the existing allocation changes. Trace how let_value's operation state is allocated and how sync_wait stores eagerly connected operation states; done means let_value uses pinned memory for all such algorithms and the sync_wait change from #970 is backed out.
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Description
The fix for #953 is not strictly correct. Only let_value's operation state needs to be in pinned memory, and it needs to be there not just for sync_wait but for all algorithms that eagerly connect a sender and store the resulting operation state in memory that isn't device-accessible.
Once let_value's operation state is allocate in pinned memory, back out the change to sync_wait that was made in #970.
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- C++
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