[ofa-general] libibumad umad_recv and umad_poll

[Ira Weiny]

On Tue, 01 Jul 2008 05:57:10 -0700
Hal Rosenstock <hrosenstock at xsigo.com> wrote:

> On Mon, 2008-06-30 at 18:31 -0700, Sean Hefty wrote:
> > I have a couple questions regarding the libibumad interface, and I'm hoping
> > someone might know the answers to.
> > 
> > Do any apps call umad_recv()/umad_poll() from multiple threads?  I'm
> > specifically interested in opensm and the diagnostic utilities.
> 
> OpenSM does not. There's a single receiver thread which calls umad_recv.
> AFAIK none of the infiniband-diags do either.
> 
> I can't speak for ibutils and any out of tree consumers.
> 
> I also haven't looked at Ira's new libibnetdisc yet.

I make the same calls ibnetdiscover does, for now...  I have thought that using
multiple threads would make some things faster but it seems fast enough for
now.

Ira

> 
> > If so, can umad_recv() support a mix of blocking and non-blocking calls
> > concurrently?  Or are all calls from a single app always blocking or always
> > non-blocking?
> > 
> > Is the user expected to modify the fd to support non-blocking calls?
> 
> libibumad does open the fd as non blocking in umad_open_port:
> 	if ((fd = open(dev_file, O_RDWR|O_NONBLOCK)) < 0)
> 
> -- Hal
> 
> > I'm more concerned with the current, actual usage of the interface, rather than
> > the theoretical operation.
> > 
> > Thanks,
> > - Sean
> > 
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