[Yt-dev] hop improvements

Matthew Turk matthewturk at gmail.com
Mon Apr 20 10:43:08 PDT 2009


Hi guys,

So I think the consensus here is that it doesn't fix the memory
issues, but it does not give bad results.  I'm going to commit, but we
can roll back if necessary.

-Matt

On Thu, Apr 16, 2009 at 4:32 PM, Britton Smith <brittonsmith at gmail.com> wrote:
> I just tried it in serial on Stephen's data and it worked.  I'll queue it up
> for the larger data.  I intend to try a few different processor
> configurations to get some information on the ram usage.
>
> Britton
>
> On Thu, Apr 16, 2009 at 5:19 PM, Matthew Turk <matthewturk at gmail.com> wrote:
>>
>> Guys,
>>
>> What seems to be happening was a floating point comparison issue.  It
>> must just be something with the way the particles were aligned in the
>> new dataset compared to the old.  Changing the type of 'fm' on line 59
>> of hop_kd.c from 'float' to 'npy_float64' fixed it for me; the loop
>> was never converging as a result, so it ran off the end and segfaulted
>> when it was unable to locate any more data points insie the process's
>> memory.  There may be other places that this needs to happen, and I
>> will look for them, but if you could test with this change that'd be
>> awesome.
>>
>> Let me know if that fixes it?  And if the memory improves?
>>
>> -Matt
>>
>> On Thu, Apr 16, 2009 at 1:55 PM, Stephen Skory <stephenskory at yahoo.com>
>> wrote:
>> >
>> >> I can replicate the error with D0065 on my laptop.  I'll figure it out
>> >> and fix it...  Not sure why it's not working with DD0065, but is with
>> >> RD0005.  All the dtypes seem the same.
>> >
>> > As a follow-up, yt-hop works fine on this dataset on Ranger with r1252.
>> >
>> >  _______________________________________________________
>> > sskory at physics.ucsd.edu           o__  Stephen Skory
>> > http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student
>> > ________________________________(_)_\(_)_______________
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