I just checked the code for testing 2GB limitation in OMPIO. The code works with OMPIO's  " fcoll dynamic" module. Although it does have the same 2GB limitation with the two_phase module which is based on ROMIO's implementation and the static module. I have a fix for both these modules I will commit them to trunk shortly. 


Vishwanath Venkatesan
Graduate Research Assistant
Parallel Software Technologies Lab
Department of Computer Science
University of Houston

On Nov 7, 2012, at 3:47 AM, Ralph Castain wrote:

Hi Rayson

We take snapshots from time to time. We debated whether or not to update again for the 1.7 release, but ultimately decided not to do so - IIRC, none of our developers had the time.

If you are interested and willing to do the update, and perhaps look at removing the limit, that is fine with me! You might check to see if the latest ROMIO can go past 2GB - could be that an update is all that is required.

Alternatively, you might check with Edgar Gabriel about the ompio component and see if it either supports > 2GB sizes or can also be extended to do so. Might be that a simple change to select that module instead of ROMIO would meet the need.

Appreciate your interest in contributing!

On Tue, Nov 6, 2012 at 11:55 AM, Rayson Ho <raysonlogin@gmail.com> wrote:
How is the ROMIO code in Open MPI developed & maintained? Do Open MPI
releases take snapshots of the ROMIO code from time to time from the
ROMIO project, or was the ROMIO code forked a while ago and maintained
separately in Open MPI??

I would like to fix the 2GB limit in the ROMIO code... and that's why
I am asking! :-D


Open Grid Scheduler - The Official Open Source Grid Engine

On Thu, Nov 1, 2012 at 6:21 PM, Richard Shaw <jrs65@cita.utoronto.ca> wrote:
> Hi Rayson,
> Just seen this.
> In the end we've worked around it, by creating successive views of the file
> that are all else than 2GB and then offsetting them to eventually read in
> everything. It's a bit of a pain to keep track of, but it works at the
> moment.
> I was intending on following your hints and trying to fix the bug myself,
> but I've been short on time so haven't gotten around to it yet.
> Richard
> On Saturday, 20 October, 2012 at 10:12 AM, Rayson Ho wrote:
> Hi Eric,
> Sounds like it's also related to this problem reported by Scinet back in
> July:
> http://www.open-mpi.org/community/lists/users/2012/07/19762.php
> And I think I found the issue, but I still have not followed up with
> the ROMIO guys yet. And I was not sure if Scinet was waiting for the
> fix or not - next time I visit U of Toronto, I will see if I can visit
> the Scinet office and meet with the Scinet guys!
> _______________________________________________
> users mailing list
> users@open-mpi.org
> http://www.open-mpi.org/mailman/listinfo.cgi/users
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