Greg,
Yes, that is what I was referring to. Thank for answering my question.
- Apan
On Jun 29, 2017, at 2:26 PM, Greg Titus <[email protected]<mailto:[email protected]>>
wrote:
Hello Apan --
Are you referring to the ‘mData’ chunking in
modules/internal/DefaultRectangular.chpl? If so, that has to do with the
so-called ‘multi-ddata’ feature, which split the underlying storage for default
rectangular arrays into multiple pieces (chunks) instead of just one piece.
The intent was that for NUMA architectures those pieces could be separately
placed on different NUMA nodes and we would be able to achieve perfect NUMA
storage/execution affinity despite the fact that locality is page-based.
Unfortunately this work turned out to introduce other overheads that we
couldn’t get rid of, so it’s been disabled for general use (via the param
defRectDisableMultiDData). You can ignore it.
greg
On Jun 29, 2017, at 11:12 AM, Qasem, Apan M
<[email protected]<mailto:[email protected]>> wrote:
Hello,
I am implementing data layout transformations in Chapel that favor the
GPU/heterogenous memory hierarchy.
I have been studying the dists and layout codes in the Chapel distribution. I
was wondering if someone can help me understand (or point me to documentation
that explains) the idea behind “chunking” in data layouts. It appears that it
is only used when the array element is a compound (mdata) type. But I can’t
figure out what it is meant to do by reading the code.
Thanks.
- Apan
Apan Qasem, PhD
Visiting Scholar, AMD Research
Associate Professor, Dept of Computer Science
Texas State University
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