Yes, I was thinking of a more general language feature, but I have no idea
of the path to take. This is mainly because I don't think I have a very
good understanding of the process of creating custom domain maps. Also, the
documentation on layouts is kind of sparse at the moment.
On Fri, Jun 17, 2016 at 7:38 PM, Mike Noakes <[email protected]> wrote:
> Hi John,
>
> Assuming that I have understood your proposal, I find this concept
> intriguing in the abstract. Unfortunately I think that you are considering
> a notion that is beyond the current design of Chapel. It is, of course,
> possible that someone else in the community will propose an approach
> that I am overlooking.
>
>
> As you know, domain maps are intended to allow a relatively advanced
> user to define how the indices of a domain and the elements of an array
> map to storage locations in memory. The Chapel implementation provides
> a number of useful domains maps.
>
> As you indicate this means that a user could, for example, implement
> a domain map that causes array elements to be stored in row major
> order rather than the default column major order.
>
> However accessing the field of a record that is an element of an array
> requires two levels of addressing that Chapel considers to be distinct.
>
>
> I think one could imagine developing a language feature that allows Chapel
> to transform an array of structures to be a structure of arrays. However,
> if I
> understand correctly, you are imagining a more general language feature
> that generates this behavior as one of its use cases. Is that right?
> I wonder if you have a path in mind?
>
> With thanks and regards,
>
> Mike
>
>
>
>
>
>
>
> On Jun 15, 2016, at 11:20 AM, John Hall <[email protected]>
> wrote:
>
> It appears I forgot to reply all to my original reply...
>
> After looking over the documentation a bit more thoroughly, I think that
> what I'm referring to is closer to the layout in the Domain Map section,
> rather than putting things on different locales. For instance, there is the
> discussion about being able to customize things so that an array is row
> major instead of column major, but I don't see any description of how to do
> that.
>
> With respect to AoS vs. SoA, I was thinking about customizing the layout
> of the struct/record using a domain map. For instance, the code prints an
> array of structs in Chapel. It's possible to manually adjust the AoS so
> that it is a SoA. However, it would be interesting if I could provide a
> layout/domain/domain map that accomplishes this without needing to adjust
> Foo itself and instead could just provide an alternate D.
>
> record Foo {
> var bar: int;
> var baz: int;
> }
>
> proc main() {
> var n: int = 2;
> var D: domain(1) = {1..n};
> var foo: [D] Foo;
>
> writeln(foo);
> }
>
> On Tue, Jun 14, 2016 at 1:26 PM, Elliot Ronaghan <[email protected]>
> wrote:
>
>> Hi John,
>>
>> I'm not entirely sure what you're asking WRT to domains. Domains are a
>> first-class language feature, and they are not exclusive to arrays. You
>> can definitely use them as a field of a record. I think I'm missing the
>> relation to AoS vs. SoA though. Can you say more about how you want to
>> use domains?
>>
>> As far as the cygwin issue: We test cygwin nightly, and that's not a
>> familiar issue. I would try doing a `make clobber` in $CHPL_HOME and
>> then rebuilding. My best guess is that you might have tried to build
>> without all the dependencies and when you did install them the tree was
>> left in a weird state?
>>
>> If that doesn't fix it, can you send me the output of `uname -a` as well
>> as `gcc --version`? (You can send that to me off-list since it probably
>> won't be of much use/interest to others.)
>>
>> Elliot
>>
>> >I was curious if domains only worked for arrays or if they can also be
>> used for records. Some people find it an inconvenience to change an array
>> of structs to a struct of arrays. I was thinking that the equivalent array
>> of records to record of arrays might
>> > be more easily accomplished using domains.
>> >
>> >
>> >I was going to test this myself, but I had issues installing with
>> Cygwin. At first I just realized that I hadn't installed all the
>> dependencies, but I found the doc for Cygwin and think I installed them
>> all. The last time I ran make, the tail of the output
>> > is below. I see a bunch of these undefined reference to ___ lines.
>> >
>> >./util/gen/cygwin64.gnu.wide-struct.llvm-none/misc.o:misc.cpp:(.text+0xe5f):
>> undefined reference to `Symbol::hasFlag(Flag) const'
>> >./util/gen/cygwin64.gnu.wide-struct.llvm-none/misc.o:misc.cpp:(.text+0x1113):
>> undefined reference to `FnSymbol::isIterator() const'
>> >./util/gen/cygwin64.gnu.wide-struct.llvm-none/misc.o:misc.cpp:(.rdata$.refptr.currentAstLoc[.refptr.currentAstLoc]+0x0):
>> undefined reference to `currentAstLoc'
>> >collect2: error: ld returned 1 exit status
>> >make[2]: *** [Makefile:128:
>> /cygdrive/c/chapel/chapel-1.13.0/chapel-1.13.0/bin/cygwin64/chpl.exe] Error
>> 1
>> >make[1]: *** [Makefile:65: compiler] Error 2
>> >make: *** [Makefile:57: comprt] Error 2
>> >
>> >
>>
>>
>>
>
> ------------------------------------------------------------------------------
> What NetFlow Analyzer can do for you? Monitors network bandwidth and
> traffic
> patterns at an interface-level. Reveals which users, apps, and protocols
> are
> consuming the most bandwidth. Provides multi-vendor support for NetFlow,
> J-Flow, sFlow and other flows. Make informed decisions using capacity
> planning
> reports.
> http://pubads.g.doubleclick.net/gampad/clk?id=1444514421&iu=/41014381_______________________________________________
> Chapel-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/chapel-users
>
>
>
------------------------------------------------------------------------------
Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San
Francisco, CA to explore cutting-edge tech and listen to tech luminaries
present their vision of the future. This family event has something for
everyone, including kids. Get more information and register today.
http://sdm.link/attshape
_______________________________________________
Chapel-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/chapel-users
