[Users] cctk_ash versus cctk_lsh

[Yosef Zlochower]

On 10/21/2014 09:39 AM, Erik Schnetter wrote:
> Yes, if VECTORISE_ALIGNED_ARRAYS=no (which is the default), then ash
> will be identical to lsh.
>
> No, there is currently no way to enforce this, although this would be
> very good to have for debugging.
>
> The respective code is in CarpetLib's gdata.cc, bracketed by #if
> VECTORISE && VECTORISE_ALIGNED_ARRAYS. To test, you could artificially
> add 1 to shape[0] after the line that modifies shape[0].
>

The above code in gdata.cc seems to be commented out by an #if 0



I tried modifying cacheinfo.cc as follows

diff --git a/Carpet/CarpetLib/src/cacheinfo.cc 
b/Carpet/CarpetLib/src/cacheinfo.
index c6b33b1..8a68859 100644
--- a/Carpet/CarpetLib/src/cacheinfo.cc
+++ b/Carpet/CarpetLib/src/cacheinfo.cc
@@ -121,8 +121,9 @@ pad_shape(vect<int,D> const& shape)
      }   // if pad_to_cachelines
  #endif

-    padded_shape[d] = npoints;
-    accumulated_npoints *= npoints;
+#define TEST_PAD 1
+    padded_shape[d] = npoints + TEST_PAD*(d==0);
+    accumulated_npoints *= npoints + TEST_PAD*(d==0);
    }
    assert(prod(padded_shape) == accumulated_npoints);

This seemed to add padding, but I'm still trying to debug why
the result of the test is that for timesteps 1, I get the
same results as for no padding, but on timestep 2, I get that
every other point in the buffer zone is modified by a small
amount (but larger than roundoff), while at iteration
4 nans appear on the symmetry boundary.


> -erik
>
> On Tue, Oct 21, 2014 at 8:59 AM, Yosef Zlochower <yosef at astro.rit.edu> wrote:
>> Hi,
>>
>>     Is it the case that cctk_ash[i] = cctk_lsh[i] (i=0..3)
>> if  VECTORISE_ALIGNED_ARRAYS= no? I want to update and
>> test  a code that assumed the GF sizes were
>> given by cctk_lsh. Is there a way to force
>> cctk_ash to be larger than cctk_lsh in order
>> to test the update.
>>
>> Thanks
>>
>> --
>> Dr. Yosef Zlochower
>> Center for Computational Relativity and Gravitation
>> Associate Professor
>> School of Mathematical Sciences
>> Rochester Institute of Technology
>> 85 Lomb Memorial Drive
>> Rochester, NY 14623
>>
>> Office:74-2067
>> Phone: +1 585-475-6103
>>
>> yosef at astro.rit.edu
>>
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>
>


-- 
Dr. Yosef Zlochower
Center for Computational Relativity and Gravitation
Associate Professor
School of Mathematical Sciences
Rochester Institute of Technology
85 Lomb Memorial Drive
Rochester, NY 14623

Office:74-2067
Phone: +1 585-475-6103

yosef at astro.rit.edu

CONFIDENTIALITY NOTE: The information transmitted, including
attachments, is intended only for the person(s) or entity to which it
is addressed and may contain confidential and/or privileged material.
Any review, retransmission, dissemination or other use of, or taking
of any action in reliance upon this information by persons or entities
other than the intended recipient is prohibited. If you received this
in error, please contact the sender and destroy any copies of this
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