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"cwn" , caml-list@inria.fr, comp@lists.orbitalfox.eu Date: Tue, 31 Mar 2020 11:54:45 +0200 Message-ID: <87blocyhlm.fsf@polytechnique.org> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="=-=-=" X-AV-Checked: ClamAV using ClamSMTP at svoboda.polytechnique.org (Tue Mar 31 11:54:46 2020 +0200 (CEST)) X-Spam-Flag: No, tests=bogofilter, spamicity=0.000034, queueID=6AACD5612A0 X-Org-Mail: alan.schmitt.1995@polytechnique.org Subject: [Caml-list] Attn: Development Editor, Latest OCaml Weekly News Reply-To: Alan Schmitt X-Loop: caml-list@inria.fr X-Sequence: 18077 Errors-to: caml-list-owner@inria.fr Precedence: list Precedence: bulk Sender: caml-list-request@inria.fr X-no-archive: yes List-Id: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: base64 SGVsbG8NCg0KSGVyZSBpcyB0aGUgbGF0ZXN0IE9DYW1sIFdlZWtseSBOZXdzLCBmb3IgdGhlIHdl 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OCaml Weekly News

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Hello

Here is the latest OCaml Weekly News, for the week of March 24 to 31, 2020.

An In-Depth Look at OCaml=E2=80=99s New =E2=80=9CBest-Fit=E2= =80=9D Garbage Collector Strategy

Archive: https://discuss.ocaml.org/= t/an-in-depth-look-at-ocaml-s-new-best-fit-garbage-collector-strategy/5370/= 1

OCamlPro announced

The Garbage Collector is probably OCaml=E2=80=99s greatest unsung hero. Its= pragmatic approach allows us to allocate without much fear of efficiency loss. We looked into its new "Best-fit" strategy an= d here is what we learned! http://www.ocamlpro.com/2020/03/23/ocaml-new-best-fit-garbage-col= lector/

First release of Pp, a pretty-printing library

Archive: https://discuss.ocaml.org/t/ann-first-releas= e-of-pp-a-pretty-printing-library/5371/1

J=C3=A9r=C3=A9mie Dimino announced

I'm happy to announce the first release of the pp library! This library provides a lean alternative to the = Format module of the standard library. It uses the same comcepts of box= es and break hints, however it defines its own algebra which some might find easier to work with and reaso= n about. I personally do :) The final rendering is still done via a formatter which makes it easy to integrate Pp in existing programs using Format.

We introduced this module in Dune to hel= p improve the formatting of messages printed in the terminal and it has been a success. The new API is smaller, simpler and makes it easy for d= evelopers to do the right thing. Once the Pp module of Dune was mature enough, we decided to extract it = into a separate library so that it could benefit others.

The library itself is composed of a single Pp module and has n= o dependencies. Its documentation is self-contained and no previous knowledge is required to start using it, however the variou= s guides for the Format module such as this o= ne should be applicable to Pp as well.

If you have used Format before and like me found its API compl= icated and difficult to use, I hope that you will find Pp nicer to work with!

Josh Berdine then said

Another great resource for understanding the core mental model of Format is= Format Unraveled, although if I understand pp correctly the discussion about Format not being document-based won't apply = to pp.

soupault: a static website generator based on HTML rewriting

Archive: https://discuss.ocaml.org/t/a= nn-soupault-a-static-website-generator-based-on-html-rewriting/4126/13

Daniil Baturin announced

1.10.= 0 release is available.

Bug fixes:

  • Files without extensions are handled correctly.

New features:

  • Plugin discovery: if you save a plugin to plugins/my-plugin.lua, it's automatically loaded as a widget named

my-plugin. List of plugin directories is configurable.

  • New plugin API functions: HTMLget_tag_name, HTML.sel= ect_any_of, HTML.select_all_of.
  • The HTML module is now "monadic": giving a nil to a functi= on that expects an element gives you a nil back, rather than cause a runtim= e error.

routes: path based routing for web applications

Archive: https://discuss.ocaml.org/t/ann-routes-path= -based-routing-for-web-applications/3624/6

Anurag Soni announced

0.7.2 release is now= available on opam. There have been quite a few changes since the previous versions.

  • Routes doesn't deal with HTTP methods anymore
  • The internal implementation is now based around a trie like data struct= ure
  • Routes have pretty printers
  • sprintf style route printing is supported again
  • Minimum supported OCaml version is now 4.05 (it used to be 4.06)
  • There is a release available for bucklescript as well and it is availab= le to install via npm.

Compiler Engineer at Mixtional Code in Darmstadt or anywhere e= lse in Germany

Archive: https://discuss.o= caml.org/t/compiler-engineer-at-mixtional-code-in-darmstadt-or-anywhere-els= e-in-germany/5377/1

Gerd Stolpmann announced

Type of position:

  • regular hire (no freelancers)
  • full time
  • work from home anywhere in Germany, or in the office in Darmstadt
  • work for a small and highly skilled international team, located in the = US and Europe
  • the team language is English

We are developing a compiler for a no-code platform that translates our DSL= to bytecode and/or WebAssembly. The language is largely of functional type but is also able to manage state wit= h a spreadsheet model, allowing reactive programming without having to resort to libraries. The language is statical= ly typed using a Hindley-Milner type checker. The compiler is primarily written in OCaml. Other languages of our= platform are Go, Elm, and Javascript.

We are looking for a compiler engineer with strong skills in all relevant a= reas:

  • fluent in OCaml or a similar language such as Haskell
  • Understanding of the structure of the DSL, including syntax and semanti= cs
  • Translation of FP languages to executable code
  • Code optimization
  • Graph algorithms
  • Type checking

We are open to both juniors and seniors, and payment will be accordingly. W= e are not so much interested in formal certifications but rather in real practice, either from previous jobs, rese= arch projects, or contributions to open source projects.

The no-code platform is being developed by engineers in Europe and the US a= t various places, and we usually do not meet physically but in video conferences. Working from home is very usual. = We also get you a desk in your home town if you prefer this. The compiler development is lead by Gerd Stolpmann from= Darmstadt.

Due to the strong connections to the US, video conferences will often have = to take place in evening hours, until around 7pm or 8pm.

Applications: please follow the "Apply" link at the official web page descr= ibing the position: https://rmx.mixtional= .de/static/54657cda/

Gerd Stolpmann
CEO of Mixtional Code GmbH (and OCaml hacker of the first hour)
Contact and company details: https://www.mixtional.de/contact.html

S=C3=A9bastien Besnier asked

I'm living in France, can I apply to the position (we are neighbors!)?

Gerd Stolpmann replied

Well, I can (at the moment) only make contracts using German law and for th= e social security system here. So, if you need a doctor you'd have to travel… If my company was a bit bigger t= here would be the option of opening a second site in France (even a very minimal one), but the setup costs are so far to= o high (lawyers and accountants), and it is too distracting for me to keep up with the fine points of the system in = France. Unfortunately, the EU is not that far that it is super simple for an employer to hire anywhere in Europe. - T= hanks for asking.

tiny-httpd 0.5

Archive: = https://discuss.ocaml.org/t/ann-tiny-httpd-0-5/5381/1

Simon Cruanes announced

I just released tiny-httpd 0.5 and the new tiny-httpd-camlzip, which makes = it possible to use deflate transparently for queries and responses. The server has evolved quietly and is getting so= mewhat more robust: I'm using it for an internal tool with big html pages (up to several MB) and it's reasonably fa= st and doesn't seem to memleak. There's also an improved http_of_dir to quickly and simply serve a dir= ectory on an arbitrary port.

Previous announcement here

Visual Studio Code plugin for OCaml

Archive: https://discuss.ocaml.org/t/ann-preview-visual= -studio-code-plugin-for-ocaml/5395/1

Rudi Grinberg announced

I'm proud to announce a preview release of an VSC extension for OCaml. You can fetch and install this plugin directly from the extension marketplace if you search for "OCaml Labs". The extension isn't y= et mature, but I believe that it offers a user experience comparable to other VSC extensions for OCaml already. The p= lugin should be used in conjunction with ocaml-lsp

The extension is for the OCaml "platform", which means that its scope inclu= des support for various tools used in OCaml development such as dune, opam.

Bug reports & contributions are welcome. Happy hacking.

Dismas: a tool for automatically making cross-versions of opam= packages

Archive: https://d= iscuss.ocaml.org/t/ann-prototype-dismas-a-tool-for-automatically-making-cro= ss-versions-of-opam-packages/5404/1

Daniil Baturin announced

opam-cross-* are seriously lagging behind the official opam repository and = fdopen's opam-windows, not least because importing packages by hand is a lot of work. I suppose at least a semi-automated process could help those repos grow and= stay in sync with the upstream much faster.

I've made a prototype of a tool for "stealing" packages into cross-repos. F= or obvious reasons it's called Dismas. You can find it here: https://github.com/dmbaturin/scripts/blob/master/dismas.m= l

Limitations:

  • the code is a real mess for now
  • only dune is supported by automatic build command adjustment
  • it cannot handle cases when both native and cross-version of a dependen= cy are needed

However:

  • For simple packages that use dune exclusively, it's completely automate= d. I've ported bigstreamaf and angstrom to test it, and cross-versions buil= t just fine from its output, no editing was needed.
  • It automatically converts dependencies from foo to too-$toolchain and r= emoves dependencies and build steps only

needed for with-test and with-doc. 

$ ./dismas.ml windows containers ~/devel/opam-repository/packages/container=
s/containers.2.8.1/opam
opam-version: "2.0"
maintainer: "simon.cruanes.2007@m4x.org"
synopsis:
  "A modular, clean and powerful extension of the OCaml standard library"
build: [
  ["dune" "build" "-p" "containers" "-j" jobs "-x" "windows"]
]
depends: [
  "ocaml-windows" {>=3D "4.03.0"}
  "dune" {>=3D "1.1"}
  "dune-configurator"
  "seq-windows"
]
depopts: ["base-unix" "base-threads"]
tags: ["stdlib" "containers" "iterators" "list" "heap" "queue"]
homepage: "https://github.com/c-cube/ocaml-containers/"
doc: "https://c-cube.github.io/ocaml-containers"
dev-repo: "git+https://github.com/c-cube/ocaml-containers.git"
bug-reports: "https://github.com/c-cube/ocaml-containers/issues/"
authors: "Simon Cruanes"
url {
  src: "https://github.com/c-cube/ocaml-containers/archive/v2.8.1.tar.gz"
  checksum: [
    "md5=3Dd84e09c5d0abc501aa17cd502e31a038"
    "sha512=3D8b832f4ada6035e80d81be0cfb7bdffb695ec67d465ed6097a144019e2b8a=
8f909095e78019c3da2d8181cc3cd730cd48f7519e87d3162442562103b7f36aabb"
  ]
}

$ ./dismas.ml windows containers ~/devel/opam-repository/packages/container=
s/containers.2.8.1/opam | diff
~/devel/opam-repository/packages/containers/containers.2.8.1/opam -
3c3,4
< synopsis: "A modular, clean and powerful extension of the OCaml standa=
rd library"
---
> synopsis:
>   "A modular, clean and powerful extension of the OCaml standard libra=
ry"
5,7c6
<   ["dune" "build" "-p" name "-j" jobs]
<   ["dune" "build" "@doc" "-p" name ] {with-doc}
<   ["dune" "runtest" "-p" name "-j" jobs] {with-test}
---
>   ["dune" "build" "-p" "containers" "-j" jobs "-x" "windows"]
10,11c9,10
<   "ocaml" { >=3D "4.03.0" }
<   "dune" { >=3D "1.1" }
---
>   "ocaml-windows" {>=3D "4.03.0"}
>   "dune" {>=3D "1.1"}
13,21c12
<   "seq"
<   "qtest" { with-test }
<   "qcheck" { with-test }
<   "ounit" { with-test }
<   "iter" { with-test }
<   "gen" { with-test }
<   "uutf" { with-test }
<   "mdx" { with-test & >=3D "1.5.0" & < "2.0.0" }
<   "odoc" { with-doc }
---
>   "seq-windows"
23,27c14,15
< depopts: [
<   "base-unix"
<   "base-threads"
< ]
< tags: [ "stdlib" "containers" "iterators" "list" "heap" "queue" ]
---
> depopts: ["base-unix" "base-threads"]
> tags: ["stdlib" "containers" "iterators" "list" "heap" "queue"]

Things to do:

  • identify all packages that don't need cross-versions. Is cppo one of th= em, for example?
  • add support for cases when both native and cross versions are needed. I= f menhir the only one?
  • add support for other build systems. Do all of them work well with `OCA= MLFIND_TOOLCHAIN=3Dwindows` if the build setup is written correctly?

Input from @toots and @pirbo is welcome.

Romain Beauxis then said

That's a great initiative! Here are a couple of thoughts:

  • For dune-based packages, things are indeed pretty straight-forward. Fin= ding out which dependencies need to be ported as cross-dependency is indeed= the part that's hard to automatize
  • For other build systems, it's less clear to me how to automatize. Maybe= others have some thoughts about it.
  • The CI system on opam-cross-windows is pretty good at building from scr= atch and failing if some deps are missing so trial and error there can be a= great tool.
  • Once solved for one cross situation, the problem of cross-dependencies = should be exactly the same for all other cross environment (android, iOS)

I haven't looked at the tool very closely yet but I'd say a first improveme= nt would be to be able to track cross-dependencies resolution and generate new version of the package using= them and/or generate other cross-compiled packages using them.

Anton Kochkov said

For automated pull requests, you might be interested in https://discuss.ocaml.org/t/= dependabot-and-ocaml/4282

Daniil Baturin then asked

I'm not sure if I understand the premise of dependabot. Why would anyone ha= rdcode specific dependency versions? Maybe it makes sense in certain ecosystems that suffer from never-ending ecologic= al disasters… ;)

In any case, most opam packages don't have a constraint on the upper versio= ns of their dependencies. Can dependabot use custom tracking rules to check for presense of a newer version in the r= epo? My thought was much simpler actually: track the commits in opam-repository,= run recently changed files through Dismas and send pull requests to opam-cross-*

Yawar Amin replied

It's common practice nowadays to use semantic versioning and have lockfiles= for reproducible builds. Dependabot updates semantic version ranges and lockfiles. See e.g.

Multicore OCaml: March 2020 update

Archive: https://discuss.ocaml.org/t/multicore-ocaml-march-2020-updat= e/5406/1

Anil Madhavapeddy announced

Welcome to the March 2020 news update from the Multicore OCaml team! This = update has been assembled with @shakthimaan and @kayceesrk, as with the February and January ones.

Our work this month was primarily focused on performance improvements to th= e Multicore OCaml compiler and runtime, as part of a comprehensive evaluation exercise. We continue to add additional = benchmarks to the Sandmark test suite. The eventlog tracing system and the use of hash tables for marshaling in upstre= am OCaml are in progress, and more PRs are being queued up for OCaml 4.11.0-dev as well.

The biggest observable change for users trying the branch is that a new GC = (the "parallel minor gc") has been merged in preference to the previous one ("the concurrent minor gc"). We will hav= e the details in longer form at a later stage, but the essential gist is that the parallel minor GC no longer re= quires a read barrier or changes to the C API. It may have slightly worse scalability properties at a very high = number of cores, but is roughly equivalent at up to 24 cores in our evaluations. Given the vast usability improvement= from not having to port existing C FFI uses, we have decided to make the parallel minor GC the default one for our= first upstream runtime patches. The concurrent minor GC follow at a later stage when we ramp up testing to 64-c= ore+ machines. The multicore opam remote has been updated to reflect these changes, for those who wish to try it out at home.

We are now at a stage where we are porting larger applications to multicore= . Thanks go to:

If you do have other suggestions for application that you think might provi= de useful benchmarks, then please do get in touch with myself or @kayceesrk.

Onto the details! The various ongoing and completed tasks for Multicore OCa= ml are listed first, which is followed by the changes to the Sandmark benchmarking infrastructure and ongoing PRs to = upstream OCaml.

Multicore OCaml

  • Ongoing

    • oca= ml-multicore/ocaml-multicore#240 Proposed implementation of threads in = terms of Domain and Atomic

      A new implementation of the `Threads` library for use with the new `Domain`= and `Atomic` modules in Multicore OCaml has been proposed. This builds Dun= e 2.4.0 which in turn makes it useful to build other packages. This PR is o= pen for review.

    • ocaml-multicore/safepoints-cmm-mach Better safe points for OC= aml

      A newer implementation to insert safe points at the Cmm level is being work= ed upon in this branch.

  • Completed

    The following PRs have been merged into Multicore OCaml:

    • oca= ml-multicore/ocaml-multicore#303 Account correctly for incremental mark= budget

      The patch correctly measures the incremental mark budget value, and improve= s the maximum latency for the `menhir.ocamly` benchmark.

    • ocaml-multicore/ocaml-multicore#307 Put the phase change event in the = actual phase change code. The PR includes the `major_gc/phase_change` event= in the appropriate context.

    • oca= ml-multicore/ocaml-multicore#309 Don't take all the full pools in one g= o.

      The code change selects one of the `global_full_pools` to try sweeping it l= ater, instead of adopting all of the full ones.

    • oca= ml-multicore/ocaml-multicore#310 Statistics for the current domain are = more recent than other domains

      The statistics (`minor_words`, `promoted_words`, `major_words`, `minor_coll= ections`) for the current domain are more recent, and are used in the right= context.

    • oca= ml-multicore/ocaml-multicore#315 Writes in `caml_blit_fields` should al= ways use `caml_modify_field` to record `young_to_young` pointers

      The PR enforces that `caml_modify_field()` is always used to store `young_t= o_young` pointers.

    • oca= ml-multicore/ocaml-multicore#316 Fix bug with `Weak.blit`.

      The ephemerons are allocated as marked, but, the keys or data can be unmark= ed. The blit operations copy weak references from one ephemeron to another = without marking them. The patch marks the keys that are blitted in order to= keep the unreachable keys alive for another major cycle.

    • oca= ml-multicore/ocaml-multicore#317 Return early for 0 length blit

      The PR forces a `CAMLreturn()` call if the blit length is zero in `byterun/= weak.c`.

    • oca= ml-multicore/ocaml-multicore#320 Move `num_domains_running` decrement

      The `caml_domain_alone()` invocation needs to be used in the shared heap te= ardown, and hence the `num_domains_running` decrement is moved as the last = operation for at least the `shared_heap` lockfree fast paths.

Benchmarking

The Sandmark perfor= mance benchmarking test suite has had newer benchmarks added, and work is underway to enhance its functionality.

  • ocaml-bench/san= dmark#88 Add PingPong Multicore benchmark

    The PingPong benchmark that uses producer and consumer queues has now been = included into Sandmark.

  • ocaml-bench/san= dmark#98 Add the read/write Irmin benchmark

    A basic read/write file performance benchmark for Irmin has been added to S= andmark. You can vary the following input parameters: number of branches, n= umber of keys, percentage of reads and writes, number of iterations, and th= e number of write operations.

  • ocaml-bench/= sandmark#100 Add Gram Matrix benchmark

    A request oc= aml-bench/sandmark#99 to include the Gram Matrix initialization numeric= al benchmark was created. This is useful for machine learning applications = and is now available in the Sandmark performance benchmark suite. The speed= up (sequential_time/multi_threaded_time) versus number of cores for Multico= re (Concurrent Minor Collector), Parmap and Parany is quite significant and= illustrated in the graph: 3D"20dc869a8dda1c8=

  • ocaml-bench/sa= ndmark#103 Add depend target in Makefile

    Sandmark now includes a `depend` target defined in the Makefile to check th= at both `libgmp-dev` and `libdw-dev` packages are installed and available o= n Ubuntu.

  • ocaml-bench/s= andmark#90 More parallel benchmarks

    An issue has been created to add more parallel benchmarks. We will use this= to keep track of the requests. Please feel free to add your wish list of b= enchmarks!

OCaml

Old CWN

If you happen to miss a CWN, you can send me a message and I'll mail it to you, or go take a loo= k at the archive or the RSS feed of the archives<= /a>.

If you also wish to receive it every week by mail, you may subscribe online.

Alan Schmitt

--=-=-=--