[libfabric-users] Simple libfabric Hello World Program

[James Board]

 Thanks.  I'm aware of fabtests.  But, they contain thousands of lines of code and well over a hundred subroutines.  It's difficult to follow the flow of control.  I'm looking for a simple "Hello World" type of program: something that contains the minimal amount of code necessary to send RMA messages between nodes.  It's easier for me to start with a simple example and make it do what I want versus starting with a complex example.
   

    On Wednesday, July 24, 2019, 8:05:14 PM UTC, Hefty, Sean <sean.hefty at intel.com> wrote:  
 
 > I'm new to the libfabric world.  I've been reading man pages and whatever online
> documentation I can find, but it's still unclear to me how to do the most basic things.
> Does anyone know of a simple "Hello World" program that sends RMA messages between two
> nodes?

You can look at the test apps, which are part of the same git repo:

https://github.com/ofiwg/libfabric/tree/master/fabtests

Look under fabtests/functional for dgram.c, msg.c, or rdm.c, depending on the endpoint type that you're wanting.  Those will perform message transfers between nodes.

A more stand-alone program also ships with libfabric:

https://github.com/ofiwg/libfabric/blob/master/util/pingpong.c

That will send messages between nodes using either the 'msg' or 'tagged' interfaces.  If you're wanting actual RMA transfers, rdm_rma_simple.c under fabtests/functional might be closest.

- Sean
  
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