Performance portability

Article: Introduction to OpenCL
By: EduardoS (no.delete@this.spam.com), December 11, 2010 8:20 pm
Room: Moderated Discussions
Wainwright (ian.wainwright@hpcsweden.se) on 12/11/10 wrote:
---------------------------
>That was the point I was trying to get through. Going from scalar to 4-wide can
>lower performance if you don't lower the number of threads by a factor of 4.

Reduce the numbers of threads too much and you won't be able to hide latency.

Just in case you quote a paper talking about increase the amount of work per thread this is a specific case, not a general optimization.

>Uhhhh, what? I didn't quite understand this part.

2 dispatchers with 3 execution units aren't a reason to go 4-wide.
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