[yt-users] parallel volume render returns blank image

Sam Skillman samskillman at gmail.com
Tue Nov 1 09:42:22 PDT 2011


Hi Britton,

Would you mind pasting your script and mpirun command line?  Processor 0
should be the only processor that has the entire image at the end.  If
anything processor 1 would have half an image, which is why this confuses
me.

Thanks,
Sam

On Tue, Nov 1, 2011 at 10:07 AM, Britton Smith <brittonsmith at gmail.com>wrote:

> Hi again,
>
> Just an update on this.  I was incorrect when I stated that the image
> arrays were all zeros in parallel.  What actually seems to be the case is
> that with two processors, processor 0 which does the image writing, only
> has a fraction of the total image, which to me looked like all zeros.
> Processor 1 seems to have the entire image, though.  It has the same number
> of non-zero cells as the image array does in serial mode.
>
> I still don't know what's happening, but I'm looking at it.
>
> Britton
>
>
> On Tue, Nov 1, 2011 at 11:55 AM, Britton Smith <brittonsmith at gmail.com>wrote:
>
>> Hi,
>>
>> I'm doing a pretty simple volume render that uses the Camera.snapshot
>> function.  In serial, everything seems to be working fine, but when I run
>> in parallel, the image comes out completely blank.  I have gone into the
>> snapshot routine and verified that the image array is all zeros for every
>> processor after the loop:
>> for brick in self.volume.traverse(self.back_center, self.front_center,
>> image):
>>
>> This is in the tip of the development version of yt.
>>
>> Does anyone know what the issue is here?
>>
>> Thanks,
>> Britton
>>
>
>
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