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ICFP 2019
Sun 18 - Fri 23 August 2019 Berlin, Germany

The OCaml Users and Developers Workshop brings together industrial users of OCaml with academics and hackers who are working on extending the language, type system and tools. Previous editions have been co-located with ICFP 2012 in Copenhagen, ICFP 2013 in Boston, ICFP 2014 in Gothenburg, ICFP 2015 in Vancouver, ICFP 2016 in Nara, ICFP 2017 in Oxford and ICFP 2018 in St Louis, following the OCaml Meetings in Paris in 2010 and 2011.

OCaml 2019 will be held on August 23rd, 2019 in Berlin, Germany, co-located with ICFP 2019.

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Fri 23 Aug

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09:00 - 10:00
EcosystemOCaml at Pine
Chair(s): David Allsopp University of Cambridge
Day opening
David Allsopp University of Cambridge
Invited Talk
Xavier Leroy Collège de France
The OCaml Platform in 2019
Anil Madhavapeddy OCaml Labs, Gemma Gordon University of Cambridge
10:30 - 12:00
ApplicationsOCaml at Pine
Chair(s): Igor Pikovets
OwlDE: making ODEs first-class Owl citizens
Marcello Seri Bernoulli Institute for Mathematics, Computer Science and Artificial Intelligence, University of Groningen, Ta-Chu Kao Computational and Biological Learning Lab, Department of Engineering, University of Cambridge
CausalRPC: traceable distributed computation
Executing Owl Computation on GPU and TPU
Jianxin Zhao University of Cambridge
12:00 - 13:30

Call for Presentations


Presentations and discussions focus on the OCaml programming language and its community. We aim to solicit talks on all aspects related to improving the use or development of the language and its programming environment, including, for example (but not limited to):

  • compiler developments, new backends, runtime and architectures

  • practical type system improvements, such as GADTs, first-class modules, generic programming, or dependent types

  • new library or application releases, and their design rationales

  • tools and infrastructure services, and their enhancements

  • prominent industrial or experimental uses of OCaml, or deployments in unusual situations.


The workshop is an informal meeting with no formal proceedings. The presentation material will be available online from the workshop homepage. The presentations may be recorded and made available at a later date.

The main presentation format is a workshop talk, traditionally around 20 minutes in length, plus question time, but we also have a poster session during the workshop – this allows to present more diverse work, and gives time for discussion. The program committee will decide which presentations should be delivered as posters or talks.


To submit a presentation, please register a description of the talk (about 2 pages long) at https://ocaml2019.hotcrp.com/ providing a clear statement of what will be provided by the presentation: the problems that are addressed, the solutions or methods that are proposed.

LaTeX-produced PDFs are a common and welcome submission format. For accessibility purposes, we ask PDF submitters to also provide the sources of their submission in a textual format, such as .tex sources. Reviewers may read either the submitted PDF or the text version.

Important dates

  • Extended Friday 24th May (any time zone): Abstract submission deadline
  • Sunday 30th June: Author notification
  • Friday 23rd August: OCaml Workshop

ML family workshop

The ML family workshop, held on the previous day, deals with general issues of the ML-style programming and type systems, focuses on more research-oriented work that is less specific to a language in particular. There is an overlap between the two workshops, and we have occasionally transferred presentations from one to the other in the past. Authors who feel their submission fits both workshops are encouraged to mention it at submission time and/or contact the Program Chairs.