[ofa-general] Re: Dapl 2 question/issue

[Tang, Changqing]

> -----Original Message-----
> From: general-bounces at lists.openfabrics.org
> [mailto:general-bounces at lists.openfabrics.org] On Behalf Of
> Arlin Davis
> Sent: Tuesday, January 29, 2008 12:44 PM
> To: Doug Ledford
> Cc: general
> Subject: [ofa-general] Re: Dapl 2 question/issue
>
> Doug Ledford wrote:
> > OK, I've been working on integrating the latest dapl stuff into our
> > RHEL5.2 product and I've come across what I think is an issue.
> >
> > The dapl-2 code is not compatible with dapl-1 code, and there is a
> > (albeit small, but still it exists) amount of work to
> forward port code.
> > However, you maintained the same library name (aka, libdat) for both
> > dapl-1 and dapl-2.
>
> Yes, I wanted to stay away from renaming on every major
> release if possible. But I can see your point if someone
> wants v1 and v2 development packages on the same system. The
> intention was to provide only the latest development
> environment with older versions supported in libraries only.
>
> That means that, if code were to #include
> > <dat/dat.h> and then link against -ldat, they would get the
> old dapl-1
> > headers and the new dapl-2 library (assuming the dapl-1 headers are
> > installed, which realistically they need to be until all dependent
> > code has been forward ported to dapl-2).  In order for dapl-1 and
> > dapl-2 libraries and devel environments to be installed
> > simultaneously, which is what you need for a seamless
> migration from
> > version 1 to 2, you need different names on the libs.  Is there any
> > chance we can get an updated
> > dapl-2 that actually changes the lib name to libdat2.so instead of
> > just libdat.so?
>
> I have no objections to libdat2.so.
>
> James, do you see any issues? Anyone else?

If it is this way, then all previous linked code must re-link again, even they
are only using basic uDAPL features.

And HP-MPI dlopen(libdat.so), and call dat_registry_list_providers() to find the version
number, this function always returns the runtime udapl version.

--CQ



>
> -arlin
>
>
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