Hi everyone,
I am trying to do some overlapping/synchronization of communication and
computation from within the follower iterator for arrays in the CyclicDist
module (albeit a version that I've modified). I have three main
"tasks/jobs/pieces of code" that I'd like to overlap/synchronize. Let's call
them get, yield, and put.
Get is responsible for retrieving a buffer of elements from a nonlocal locale.
Yield is yielding each element in the buffer. Put is writing back these
elements to the locale they belong to. These "tasks/jobs" are running in a
serial loop within the follower iterator.
I'd like to overlap these "tasks/jobs" so that the get call for the second
buffer can start while the first buffer is yielding and putting back. A
simplified way to envision this might be:
Get1Yield1Put1
Get2Yield2Put2
Get3Yield3Put3
.
.
.
To do this, I would like to create separate Chapel tasks from within the
follower iterator for get and put using "begin", and provide synchronization
using sync variables to block certain tasks from executing before others
finish. These "tasks/jobs" aren't doing any yielding so it should be safe to do
within the follower iterator. However, I get the following error when creating
new tasks within a follower iterator:
error: invalid use of parallel construct within serial iterator
Can any of you recommend a way around this so I can accomplish this
overlapping/synchronization? Thanks.
Aroon Sharma
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