Comparing Parallel Functional Array Languages: Programming and Performance

91•vok•5mo ago

Comments

yubblegum•5mo ago

Chapel got a mention in the 'Related Work' section. I looked at it a few years ago and found it compelling (but I don't do HPC so it was just window watching). What's the HN feedback on Chapel?

https://chapel-lang.org/

marai2•5mo ago

If you scroll down on the Chapel-lang website, there seems to be a lot of activity happening with this language. There is even going to be a ChapelCon 2025.

https://chapel-lang.org/blog/posts/chapelcon25-announcement/

throwaway17_17•5mo ago

Chapel and Lustre (a parallel, distributed file system) from Cray were funded by DARPA’s High Productivity Computing Systems program. This work, along with Fortress, from Sun, were developed explicitly to enable and ‘simplify’ the programming of distributed “supercomputers”. The work and artifacts, along with the published documentation and research is of particularly high quality.

Even if you aren’t involved in HPC I’d say the concepts transfer or provide a great basis for parallel and distributed idioms and methodologies that can be adapted to existing languages or used in development of new languages.

TL;DR - Chapel is cool and if you are interested in the general subject matter (despite a different focus) Fortress, which is discontinued, should also be checked out.

bradcray•5mo ago

@yubblegum: I'm unfairly biased towards Chapel (positively), so won't try to characterize HN's opinion on it. But I did want to note that while Chapel's original and main reason for being is HPC, now that everyone lives in a parallel-computing world, users also benefits from using Chapel in desktop environments where they want to do multicore and/or GPU programming. One such example is covered in this interview with an atmospheric science researcher for whom it has replaced Python as his go-to desktop language: https://chapel-lang.org/blog/posts/7qs-dias/

yubblegum•5mo ago

Thank you Brad! I was in fact wondering about GPU use myself. Does it work with Apple's M# GPUs?

Btw, I was looking at the docs for GPU [1] and unsolicited feedback from a potential user is that the setup process needs to become less painful. For example, yesterday installed it via brew but then hit the setup page for GPU and noted I now needed to build from source.

(Back in the day, one reason some of Sun's Java efforts to extend Java's fieddom faltered was because of the friction of setup for (iirc) things like Applets, etc. I think Chapel deserves a far wider audiance.)

[1]: https://chapel-lang.org/docs/technotes/gpu.html#setup (for others - you obviously know the link /g)

p.s. just saw your comment from last year - dropping it here for others: https://news.ycombinator.com/item?id=39032481

bradcray•5mo ago

@yubblegum: I'm afraid we don't have an update on support for Apple GPUs since last year's comment. While it comes up from time-to-time, nobody has opened an issue for it yet (please feel encouraged to!), and it isn't something we've had the chance to prioritize, where a lot of our recent work has focused on improving tooling support and addressing user requests.

I'll take your feedback about simplifying GPU-based installs back to our team, and have noted it on this thematically related issue: https://github.com/chapel-lang/chapel/issues/25187#issuecomm...

munchler•5mo ago

Are these languages pure in the functional sense? E.g. Do they allow/encourage mutation? My understanding is that APL permits mutable state and side effects, but maybe they are rarely used in practice? If you're modifying the contents of an array in-place, I don't think it's reasonable to consider that functional.

zfnmxt•5mo ago

Futhark, SaC, and Accelerate have purely functional semantics. Futhark has something called "in-place updates" that operationally mutate the given array, but semantically they work as if a new array is created (and are statically guaranteed to work this way by the type system).

RodgerTheGreat•5mo ago

APL arrays are values in the same sense as value types in any functional language. You don't explicitly modify arrays in-place; if they happen to have a refcount of 1 operations may happen in-place as an optimization, but not in a manner which observably alters program behavior.

grg0•5mo ago

Accelerate is a Haskell library/eDSL.

axman6•5mo ago

I wasn’t expecting to personally know two of the authors, but having Accelerate included makes sense.

geocar•5mo ago

> My understanding is that APL permits mutable state and side effects ... If you're modifying the contents of an array in-place, I don't think it's reasonable to consider that functional.

      a←'hello'
      a[1]←'c'

This does _not_ modify the array in-place. It's actually the same as:

     a←'hello'
     a←'c'@1⊢a

which is more obviously functional. It is easy to convince yourself of this:

      a←'hello'
      b←a
      b[1]←'j'
      a,b

returns 'hellojello' and not 'jellojello'.

teleforce•5mo ago

Notice that all the all the languages mentioned depends on the external BLAS library for example OpenBLAS for performance.

D language have excellent support functional and array features with parallel support. On top that not known to others it has high performance native BLAS kind of library with ergonomic and intuitiveness similar to python [1].

[1] Numeric age for D: Mir GLAS is faster than OpenBLAS and Eigen (2016):

http://blog.mir.dlang.io/glas/benchmark/openblas/2016/09/23/...

zfnmxt•5mo ago

> Notice that all the all the languages mentioned depends on the external BLAS library for example OpenBLAS for performance.

That's incorrect. Futhark doesn't even have linear algebra primitives---everything has to be done in terms of map/reduce/etc: https://github.com/diku-dk/linalg/blob/master/lib/github.com...

tomsmeding•5mo ago

The same holds for Accelerate, and I'm fairly sure also SaC and APL. DaCe even gets a special mention in the paper in section 10.5 stating that they specifically _do_ use BLAS bindings.

joe_the_user•5mo ago

"Notice that all the all the languages mentioned depends on the external BLAS library". I didn't notice this 'cause I don't think it's true. For example, it highly implausible that APL[1] would depend on BLAS[2] considering APL predates BLAS by 5-10 years ("developed in the sixties" versus "between 1971 and 1973"). I don't think Futhark uses BLAS either but in modern stupidity, this currently two hour old parent has taken over Google results so it's hard to find references.

[1] https://en.wikipedia.org/wiki/APL_(programming_language)

[2] https://en.wikipedia.org/wiki/Basic_Linear_Algebra_Subprogra...

DrNosferatu•5mo ago

Matlab supposedly is “portable APL”.

DrNosferatu•5mo ago

the man who invented MATLAB, Cleve Moler said: [I’ve] always seen MATLAB as “portable APL”. [1]

…why the downvoting?

[1] - https://computinged.wordpress.com/2012/06/14/matlab-and-apl-...

beagle3•5mo ago

I didn't downvote, but ... as someone who used both, this statement seems nonsensical.

APL is mathematical notation that is also executable. It is all about putting a mathematical algorithm in a succinct, terse way.

MATLAB is a clunky Fortran-like language that does simple 2D matrix stuff reasonably terse (though not remotely as terse as APL), and does everything else horribly awkwardly and verbosely.

Modern MATLAB might be comparable to 1960s APL, but original MATLAB was most certainly not, and even modern MATLAB isn't comparable to modern APL (and its successors such as BQN and K)

devlovstad•5mo ago

I took a course on massively parallel programming taught by one of the authors of this paper that extensively used Futhark and CUDA. While I have not used any of these languages since, I have used JAX[1] quite a lot, where the learnings from this course have been quite helpful. Many people will end up writing code for GPUs through different levels of abstraction, but those who are able to reason about the semantics through functional primitives might have an easier time understanding what's happening under the hood.

vanderZwan•5mo ago

I think the intended footnote was accidentally left out. Were you talking about this Python library?

https://docs.jax.dev/en/latest/index.html

tough•5mo ago

There's a JAX for AI/LM too

https://github.com/jax-ml/jax

but yeah no idea which the OP meant

zfnmxt•5mo ago

> I took a course on massively parallel programming taught by one of the authors of this paper that extensively used Futhark and CUDA.

PMPH? :)

VST3 audio plugin format is now MIT

Google flags Immich sites as dangerous

Radios, how do they work? (2024)

Run interactive commands in Gemini CLI

Scripts I wrote that I use all the time

Willow quantum chip demonstrates verifiable quantum advantage on hardware

Accessing Max Verstappen's passport and PII through FIA bugs

Ovi: Twin backbone cross-modal fusion for audio-video generation

JMAP for Calendars, Contacts and Files Now in Stalwart

Glasses-free 3D using webcam head tracking

Karpathy on DeepSeek-OCR paper: Are pixels better inputs to LLMs than text?

Why SSA Compilers?

Play abstract strategy board games online with friends or against bots

The first interstellar software update: The hack that saved Voyager 1 [video]

When You Get to Be Smart Writing a Macro

Sodium-ion batteries have started to appear in cars and home storage

The mild mannered Englishman who was the most prolific ghost hunter

Element: setHTML() method

Programming with Less Than Nothing

Derek Sivers's database and web apps

Rivian's TM-B electric bike

Common yeast can survive Martian conditions

InpharmD (YC W21) Is Hiring – NLP Engineer

LibCube: Find new sounds from audio synths easier

HP SitePrint

VortexNet: Neural network based on fluid dynamics

Show HN: Cuq – Formal Verification of Rust GPU Kernels

Speculations on arenas and non-trivial destructors

I see a future in jj

Criticisms of “The Body Keeps the Score”

VST3 audio plugin format is now MIT

Google flags Immich sites as dangerous

Radios, how do they work? (2024)

Run interactive commands in Gemini CLI

Scripts I wrote that I use all the time

Willow quantum chip demonstrates verifiable quantum advantage on hardware

Accessing Max Verstappen's passport and PII through FIA bugs

Ovi: Twin backbone cross-modal fusion for audio-video generation

JMAP for Calendars, Contacts and Files Now in Stalwart

Glasses-free 3D using webcam head tracking

Karpathy on DeepSeek-OCR paper: Are pixels better inputs to LLMs than text?

Why SSA Compilers?

Play abstract strategy board games online with friends or against bots

The first interstellar software update: The hack that saved Voyager 1 [video]

When You Get to Be Smart Writing a Macro

Sodium-ion batteries have started to appear in cars and home storage

The mild mannered Englishman who was the most prolific ghost hunter

Element: setHTML() method

Programming with Less Than Nothing

Derek Sivers's database and web apps

Rivian's TM-B electric bike

Common yeast can survive Martian conditions

InpharmD (YC W21) Is Hiring – NLP Engineer

LibCube: Find new sounds from audio synths easier

HP SitePrint

VortexNet: Neural network based on fluid dynamics

Show HN: Cuq – Formal Verification of Rust GPU Kernels

Speculations on arenas and non-trivial destructors

I see a future in jj

Criticisms of “The Body Keeps the Score”

Comparing Parallel Functional Array Languages: Programming and Performance

Comments