[libfabric-users] Tagged message question

[Chris Dolan]

Yes, the provider may provide some of the memory. In the example of RxM
(which emulates tagged messaging for providers that don't support it
directly, here's where the buffer pools are allocated with their sizes
(size per entry, number of entries):
https://github.com/ofiwg/libfabric/blob/master/prov/rxm/src/rxm_ep.c#L334

On Sun, Mar 15, 2020 at 10:45 AM Biddiscombe, John A. <biddisco at cscs.ch>
wrote:

> Dear list,
>
>
> I'm upgrading my code to allow the use of tagged messages - which appear
> to work fine. thanks. very nice feature.
>
>
> If I send a tagged message, but no tagged receives have yet been posted,
> the message is sent ok and I get a send completion. None of the untagged
> pre-posted receives are matched with it, but when I post a tagged receive,
> it matches.
>
>
> Who provided the memory that the received message went into between being
> received and my posting the recv buffer? Did libfabric supply some memory
> buffer 'on the fly' that the tagged message went into?
>
> If that's the case, are there any precautions/guidelines I ought to follow
> regarding the size of the tagged sends?
>
>
> Thanks
>
>
> JB
>
>
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