[Pvfs2-developers] Strange behavior with level2 (MPI-IO.c)

[Rob Ross]

Hi guys,

It's *very* cool to see this all coming together.

Rob

Thomas Ludwig wrote:
> Hi all,
> 
> Robert Latham wrote:
>> On Thu, Mar 08, 2007 at 05:50:52PM +0100, Julian Martin Kunkel wrote:
>>> We see a rather strange and wrong behavior with PVFS2 using a file view with 
>>> MPI-IO using different levels :)
>> You guys do a great job finding the most excellent corner cases.
> 
> :-) as Julian said: "We see". We now have our Jumpshot extension running
> quite well and we are about to prepare a talk and a report about it.
> 
> Look at the attached screen dump. It shows four time lines for the
> client processes on the top. They do open, set_view, write, barrier. The
> lower 4x4 time lines are from the four I/O servers (view is expanded
> such that you do not have overlapping events). The green events are jobs
> ( dspace_..., BMI_send, FLOW, BMI_send). Within the flow you see the
> TROVE_WRITE_LIST event (brown). It gives you the data in the info lines
> that we added to jumpshot. They get updated by mouse-over events. The
> mouse was over the top-most trove event when I made the dump. It says
> 131.072 (bytes). Well, I was just curious whether everything adds up
> nicely - and it didn't. :-)
> 
>> Hope you don't find any more bugs,
> 
> Not very likely. :-)
> 
>> but if you do, keep the reports
>> coming.
> 
> Definitely. :-)
> 
> Details on the project will follow next week. I produced lot's of screen
> dumps and are about to put together some nice slides explaining everything.
> 
> Bye,
> 
> 	Thomas
> 
> 
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