[MOAB-dev] Setting tags of non-owned entities

[Grindeanu, Iulian R.]

Yes, the wording maybe is unclear

the "right to set tag values" refers to the fact that those values can be propagated to other processors, using exchange_tags

locally, you can set any value on any entity in that local instance, it does not matter if it is shared, owned or ghosted

the only guarantee is that after calling exchange_tags on that tag, the value on the owning instance wins, and gets propagated to all other instances of that entity (or if you save the file, in parallel, the owning instance wins)

Iulian
________________________________________
From: moab-dev-bounces at mcs.anl.gov [moab-dev-bounces at mcs.anl.gov] on behalf of Alexander Nikolas Breuer [anbreuer at ucsd.edu]
Sent: Friday, July 15, 2016 12:56 AM
To: MOAB dev
Subject: [MOAB-dev] Setting tags of non-owned entities

Dear MOAB-team,

I have a (hopefully) quick questions on the User Guide:

> Owning Processor: Each shared entity is owned by exactly one processor. This processor has the right to set tag values on the entity and have those values propagated to any sharing processors.

Would like to create an (globally) inconsistent state by setting values (dense tag) of non-owned entities. Don’t need this info on neighboring ranks -> I’ll never propagate that info through pcomm. Are there any technical reasons existing against doing so?

Should I initialize the ghost entities remotely first so that the memory gets allocated properly?

> Storage for a given dense tag is not allocated until a tag value is set on an entity; memory for a given dense tag is allocated for all entities in a given sequence at the same time.


Thanks,

Alex

PS: [6] “MOAB Users Email List.”, moab at mcs.anl.gov. in http://ftp.mcs.anl.gov/pub/fathom/moab-docs/contents.html#references seems to be broken:

> The following message to <moab at mcs.anl.gov> was undeliverable.
> The reason for the problem:
> 5.1.0 - Unknown address error 550-'#5.1.0 Address rejected.'


--
Alexander Breuer
University of California, San Diego
San Diego Supercomputer Center
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