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Subject: Re: [OMPI devel] RFC: MCA system revamp phase 1
From: Jeff Squyres (jsquyres) (jsquyres_at_[hidden])
Date: 2013-03-26 17:50:01


Bump. Reminder to everyone that this RFC expires tomorrow.

It's a big change.

On Mar 20, 2013, at 3:29 PM, Nathan Hjelm <hjelmn_at_[hidden]> wrote:

> What: This is the first of a series of changes intended to update the
> MCA parameter and frameworks/components systems. The specific
> changes in this RFC are itemized below.
>
> Where: Just about the entire code base.
>
> Why: To support the MPI-3 MPI_T_* tools interface. Also, a
> cleanup/revamp of the MCA param system has been on to to-do list
> for a long, long time.
>
> Timeout: One week from today at 3pm US Mountain time (see below!).
>
> --------
>
> More detail:
>
> This RFC contains the following changes:
>
> MCA Variable System (aka "MCA param system"):
> - Replaces the MCA parameter system. A "shim" layer will be provided
> in the trunk (for a time) and v1.7 (for the duration of the series).
> - All calls to mca_base_param_* have been changed to mca_base_var_*.
> - Support for an override variable file
> "openmpi-mca-params-override.conf" with values that cannot
> otherwise be reset.
> - Support for enumerated integer values. For examples, please look at
> ompi/mca/coll/tuned .
> - All components have been updated to the new system.
> - ompi_info output generation has been updated to the new MCA
> variable system.
>
> MCA Framework System:
> - Formalizes the framework interface. Frameworks can now provide
> functions for variable registration, open, and close.
> - Three functions are provided to interface with frameworks:
> mca_base_framework_register (registers MCA variables for the
> framework itself), mca_base_framework_open,
> mca_base_framework_close.
> - Declare your framework with MCA_BASE_FRAMEWORK_DECLARE (see
> mca_base_framework.h)
> - All frameworks have been updated to the new system.
> - All frameworks MUST conform to the new interface. This may
> include 1.7 frameworks!
>
> The work can be found @ github ("svn-commit" branch):
>
> http://github.com/hjelmn/ompi-mca-var
>
> Commits of interest:
> https://github.com/hjelmn/ompi-mca-var/commit/ac96dfaa08f1119ba17e55ad7ef35b0448801033
> https://github.com/hjelmn/ompi-mca-var/commit/6450f9a5d5b080528ba8603ca6338d302bca5dc8
> https://github.com/hjelmn/ompi-mca-var/commit/73e621b3684b1cbaee56a65b46a855af8ca76808
> https://github.com/hjelmn/ompi-mca-var/commit/e44d6aaa4709883c8644a02e8379a56f0b637850
> https://github.com/hjelmn/ompi-mca-var/commit/8577ab48be59b418f482ffdc2a2ea719895d8ad6
> https://github.com/hjelmn/ompi-mca-var/commit/50a0874fbf4907c2e16c799e013e3499c9458503
> https://github.com/hjelmn/ompi-mca-var/commit/be525bef85f89078df164807df09b70daedbb23a
>
> A diff compared to the SVN HEAD is attached; it's currently around 74k
> lines (!).
>
> It may take some time to understand the impacts on your components and
> frameworks. That said, these changes *are* coming and there will be
> time to fix issues on the trunk before these updates are CMRed to 1.7.
> So I am setting the timeout for a week from today at 3:00 PM US
> Mountain Daylight time.
>
> *** Because the commit is so invasive, I will be asking for quiet time
> *** while I commit the changes.
>
> Please let me know if there is anything that should be done to improve
> documentation. I will use git svn dcommit (the master repository is
> git-svn) to push the 8 commits found on the svn-commit branch. I can
> break it into more commits if there are any objections. I will then
> remove the .gitignore file (any any other files not relevant to svn).
>
> Questions? Comments? Hate mail?
>
> -Nathan Hjelm
> HPC-3, LANL
> <mca_revamp.patch.bz2>_______________________________________________
> devel mailing list
> devel_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/devel

-- 
Jeff Squyres
jsquyres_at_[hidden]
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