[Llvm-bgq-discuss] Details behind MPI wrapper for bgclang++

[Jeff Hammond]

everyone on this list knows how to use email filters.  it's better to
have such details archived for the alien archeologists that will
examine our society thousands of years from now.

jeff

On Fri, Mar 1, 2013 at 4:07 PM, Jack Poulson <jack.poulson at gmail.com> wrote:
> On Fri, Mar 1, 2013 at 1:03 PM, Jack Poulson <jack.poulson at gmail.com> wrote:
>>
>> On Fri, Mar 1, 2013 at 12:43 PM, Hal Finkel <hfinkel at anl.gov> wrote:
>>>
>>> The lightweight core files are really text files, I looked at the line:
>>> While executing instruction at..........0x000000000100c7c4
>>>
>>> Then I ran powerpc64-bgq-linux-objdump -C -d Backproj-2d and looked at
>>> the assembly around address 100c7c4 (if you search for it in the file, note
>>> that objdump may omit the leading 0s in the address).
>>>
>>
>> Thanks!
>>
>>>
>>> Can you try compiling/linking with
>>> /home/projects/llvm/r175919-20130222/bin/bgclang++ instead of the default
>>> one; this is a newer build and I'd like to see if it still has whatever bug
>>> is yielding this miscompile.
>>
>>
>> Strangely enough, my executable ran correctly with the new version of LLVM
>> (and passed my accuracy tests). I'm rerunning it again right now to help
>> rule out whether or not that was a fluke.
>>
>> Any ideas as to what might have been the major change in the new release?
>>
>
> Sigh. It was a fluke.
>
> Perhaps we should take this offline to avoid spamming everyone else on the
> list? I will try linking statically next.
>
> Jack
>



-- 
Jeff Hammond
Argonne Leadership Computing Facility
University of Chicago Computation Institute
jhammond at alcf.anl.gov / (630) 252-5381
http://www.linkedin.com/in/jeffhammond
https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond