[Openmp-dev] Porting notes

[Cownie, James H]

Probably no reason; just work.

-- Jim

James Cownie <james.h.cownie at intel.com>
SSG/DPD/TCAR (Technical Computing, Analyzers and Runtimes)
Tel: +44 117 9071438


-----Original Message-----
From: Dr D. Chisnall [mailto:dc552 at hermes.cam.ac.uk] On Behalf Of David Chisnall
Sent: Tuesday, March 04, 2014 11:02 AM
To: Cownie, James H
Cc: openmp-dev at dcs-maillist2.engr.illinois.edu
Subject: Re: [Openmp-dev] Porting notes

Hi,

I particularly noticed this:

> The runtime uses a variety of atomic operations; you'll need to work 
> out how to implement them. They're used to implement locks and to 
> implement atomic operations for the compiler. (#pragma omp atomic). A 
> "compare and swap" is particularly useful here if you have one. 
> Otherwise you may have to using locking to guard the operation, 
> however that is normally significantly slower than a single atomic 
> operation or a CAS.

Is there a reason that we can't use the C11 atomic types and operations, since the compiler (or support library) already provides efficient implementations of these.

David

On 4 Mar 2014, at 09:33, Cownie, James H <james.h.cownie at intel.com> wrote:

> Here are some initial notes on porting issues.
> They're still extremely incomplete (and haven't been latex or doxygen-ised), but since people seemed to want *something* sooner rather than later maybe they'll help.
>  
> -- Jim
> 
> James Cownie <james.h.cownie at intel.com> SSG/DPD/TCAR (Technical 
> Computing, Analyzers and Runtimes)
> Tel: +44 117 9071438
>  
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