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Reduction prevents parallel execution on two GPUs
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mkcolg



Joined: 30 Jun 2004
Posts: 6616
Location: The Portland Group Inc.

PostPosted: Mon Mar 10, 2014 5:01 pm    Post subject: Reply with quote

Quote:
Why can't you defer the copy back to a acc wait?

"wait" is optional or could be in a different area of code.

Quote:
But sometimes, you (as user) just miss a tiny detail in the specification and then you get confused.
Understood. This is a topic that the compiler folks here have thought about with no clear solution. Though, I'm wondering if we could issue a warning when async is used that would be inhibited by data synchronization...Let me check.

- Mat
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