I don't get the chance to talk about Arkouda—a Python library for doing exploratory data analytics interactively on supercomputers—nearly as often as I do Chapel, so this talk at the University of Washington eScience Institute (uwescience.bsky.social) that wrapped up 2025 was a fun one for me.

Chapel 2.7 is now live! 💙 This release marks an important milestone for the project, as 2.7 is the first version released since Chapel joined the HPSF as an established project in November. Check out all the highlights in our latest blog post: hpsf.io/blog/2025/ch...

I'm looking forward to introducing Arkouda to the UW community tomorrow at the eScience institute's (@uwescience.bsky.social) Data Science Seminar!

I'm really excited about this announcement and the opportunity to work with the High Performance Software Foundation (@hpsf.bsky.social) on their goal of improving the productivity and adoption of HPC through open-source software!

If you're at #SC25 today, be sure to catch @mppf.bsky.social's talk at PAW-ATM starting at 11:30am comparing distributed memory radix sort in a number of programming models, including Chapel, Lamellar, SHMEM, and MPI: sourceryinstitute.github.io/PAW/

@lumi-supercomputer.eu is a very cool supercomputer. Chapel is a very cool language. And Engin is an excellent speaker. Check his talk out tomorrow if parallel programming at scale is of interest to you!

Tomorrow is the fourth and final day of ChapelCon '25! Join us for this free, online virtual event to catch my annual "State of the Project" talk, an invited talk by Todd Gamblin (@tgamblin.bsky.social), and much, much more. Register and browse the agenda at: chapel-lang.org/chapelcon25/

The phrase "Summer of Programming Languages" is one that's music to my ears. Thanks to HiRSE for sponsoring this video series and for including Chapel as part of it!

It's been a busy quarter for Chapel, and you can read all about it in our latest newsletter which came out this week!

I'm really happy about this new installment of our interview series with Chapel users, but more than that, I'm proud of the great accomplishments that users like Tiago and Guillaume are achieving with our language!

Congratulations to the Spack team on reaching this significant milestone!

Are GitHub stars something of a silly metric? In my opinion, "yes." Would I like you to star our project anyway? Also "yes". :)

Engin's a great speaker, so you won't want to miss his virtual talk for Los Alamos tomorrow, particularly if you are interested in parallel programming of CPUs, GPUs, and/or supercomputers!

I made the new scalable sort routine for the Chapel standard library! Now it's possible to easily sort a distributed array just by calling the standard library 'sort'. Outperforms the best distributed Chapel sort to date, and it performs competitively with the KaDiS AMS sort written in MPI. #HPC

On top of hundreds of other formulas, this release of E4S adds Chapel's GPU support to the mix. Thanks to the E4S project for this addition!

The second article in my archival "10 myths about scalable parallel programming languages (redux)" blog series, with current commentary, 13 years later, is now available. Trigger warnings: multiple mentions of HPF #HPC

We're now one week out from IPDPS and this keynote!

It's been a very busy quarter for the Chapel community, and Engin has done a great job of capturing the highlights in our latest newsletter. Read on to see what we've been up to!

Look carefully and you can see @mppf.bsky.social and Shreyas Khandekar sporting their Chapel Programming Language keychains. :)

I'm excited to have the opportunity to give this virtual talk hosted by KAUST tomorrow morning. If you're interested in learning a bit about Chapel, please feel encouraged to register and attend!

I'm excited to be giving this keynote at HIPS / IPDPS 2025, using the workshop's 30th anniversary as an opportunity to reflect on the past 30 years of #HPC programming language design and adoption. Hope to see many of you there!

For those at #CUG2025 this week, be sure to catch @michelle-strout.bsky.social's talk tomorrow about our team's collaboration with @cworthy.bsky.social in support of climate research.

Though I wasn't able to attend, I'm very excited for HPSFCon to be happening in Chicago this week. Michael and Shreyas will be representing our project on-site, so seek them out to talk Chapel, HPC programming, and open-source. They'll also be presenting a short project overview tomorrow (Monday).

In June, I will be giving a talk at HIPS 2025 reflecting on the past 30 years of programming languages in #HPC. I have an outline and my own opinions as to why new languages have not been adopted, but want to hear yours as well: Why would you say the HPC community has not adopted new languages?

I was really proud of this "[10] Myths of Scalable Parallel Programming Languages" series when I wrote it for IEEE TCSC in 2012. I'm somewhat terrified to go back and re-read my writing now, but in honor of its 13th anniversary, we're doing just that, re-publishing and reflecting on the series.

Given the recent focus on software safety, I really enjoyed this article by @mppf.bsky.social exploring how Chapel, despite not being as safety-driven as Rust, comes quite close for the errors he studied, while also arguably having a better story in terms of programmability and #HPC parallelism.

On one hand, the support we've just added for multidimensional array literals in Chapel is not a big deal compared to its core features for distributed scalable parallelism. On the other hand, it's a feature that users have understandably requested for years, so it's great to have landed it in 2.4!

Continues to be excited by the community-building activities HPSF is undertaking to advance HPC software!

I'm particularly proud of this release. Not because it contains crazy new massively groundbreaking changes, but instead the opposite: Because it feels like the highlights shore up the technology and fill in gaps that users have asked us to focus on. (That said, the Python interop is very cool!)

Nice to see LBNL increasing their participation in HPSF!

What must I do to make you remove that little green dot, Element? I've scrolled through all 41 replies in the thread… I've clicked on most of them… What... Must... I... DO?!?

@mppf.bsky.social has recently been taking a deep-dive into writing distributed radix sorts in Chapel, MPI, and SHMEM for #HPC. If you're interested in the topic, be sure to check out his repository below.

Looking forward to this event in May!

Got #HPC -ready sorts or expertise?

@tgamblin.bsky.social and @walkingrandomly.bsky.social : Any chance of merging the two HPC starter packs into one to reduce confusion? Or to change the name of one of them to distinguish them somehow?

Another quarter's gone by already?!? Read about what the Chapel community's been up to since November with #HPC in our latest newsletter.

I'm always very curious to see how our newest Chapel releases will compare in the Computer Language Benchmarks Game. How I wish we had a similar framework for comparing programming models within #HPC.

I'm very excited about the launch of our new website! We've made a few attempts to modernize it over the years, but none have managed to get traction until now, thanks in large part to 'hugo' (gohugo.io). Please let us know if you see issues or things to improve that we should add to our list!

For those curious about how Arkouda got started and why it was written in Chapel, check out this interview we've just published with Bill Reus. (For those not already familiar with Arkouda, it's a Python library framework that lets you drive a supercomputer interactively from your Jupyter notebook)

A few years ago, the question I most dreaded after describing Chapel's goal of supporting "any parallel algorithm on any parallel hardware" was "Does it support GPUs?" Now I look forward to the question thanks to the amazing work Engin and our GPU sub-team have done.

A number of us on the Chapel project have been enjoying our interactions on BlueSky these past few months, so we have kicked off a new @chapellanguage.bsky.social account to reflect that. Follow the project there, and thanks to all who make BlueSky a great forum for #HPC conversations!

ICYMI in the run-up to SC24, be sure to give Chapel’s fall newsletter a look. In editing it, Engin's been doing a great job of pulling together information about recent demos, tutorials, talks, and recordings; our new Discord server; upcoming events; and more! chapel.discourse.group/t/chapel-new...

I'm really pleased to announce that we released Chapel 2.3 today, including some nice features for Python interop, vendor-neutral GPU computing, sparse computations, and performance optimizations! Read about these highlights and more in our release announcement at: chapel-lang.org/blog/posts/a...

Always likes when a parallel Chapel solution to a @was.tl Advent of Code puzzle fits within a single tweet (or… what are we calling them here?). Here's part 2 of day 1, leaning heavily on Chapel's associative domains and arrays:

We’d like to thank everyone who engaged with our team at #SC24, whether at the HPE booth, one of our talks, or chatting with us in the halls about Arkouda and Chapel. Please reach out about any follow-ups, and we look forward to SC25! chapel-lang.org/community.html

Interested in performing multidimensional array computations on #HPC systems using Python & Jupyter? If so, catch Jeremiah's Pangeo talk today at 4pm EST. In it, he'll describe an Arkouda extension that supports the XArray and Python Array APIs. This is a free, online event: www.pangeo.io/showcase

At #SC24 and interested in software productivity for #HPC? Be sure to swing by the HPE booth (#2219) to hear from members of our dev team about: * Arkouda: a framework for driving HPC computations interactively from Python + Jupyter notebooks * Chapel: a Pythonic language delivering HPC performance

The former overseas student in me is loving seeing Italia in the top 5 of the #HPC #top500

#SC24 come by the HPE booth to see some of El Capitan & then wander to the other side of the booth to learn about programmability: I’ll demo Arkouda and Chapel!

If you're at #SC24, be sure to drop by the HPE booth to talk with members of the Arkouda and Chapel development teams, and to see a demo of these productive technologies in action. See you at booth 2219!