[cwn] Attn: Development Editor, Latest OCaml Weekly News
Alan Schmitt
alan.schmitt at polytechnique.org
Mon Jan 30 22:44:31 PST 2023
Hello
Here is the latest OCaml Weekly News, for the week of January 24 to 31,
2023.
Table of Contents
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Stramon 0.2.2 - Process behavior monitoring utility based on strace
Diskuv OCaml 1.2.0 (Windows, MSVC)
Simple installation of packages without network
Old CWN
Stramon 0.2.2 - Process behavior monitoring utility based on strace
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Archive:
<https://discuss.ocaml.org/t/ann-stramon-0-2-2-process-behavior-monitoring-utility-based-on-strace/11242/1>
Darren announced
────────────────
I’m happy to announce [Stramon] (right now mainly distributed as
statically built binary [here]).
Stramon is primarily created to make usage of strace and the analysis
of strace output easier.
Stramon invokes strace underneath, analyzes the piped output and
summarizes the findings into a JSON file when the command finishes.
An example JSON created by running Firefox via Stramon can be seen
[here]. (Network access section is trimmed.)
[Stramon] <https://github.com/darrenldl/stramon>
[here] <https://github.com/darrenldl/stramon/releases/tag/stramon-0.2.2>
[here]
<https://github.com/darrenldl/stramon/blob/main/examples/firefox.json>
Diskuv OCaml 1.2.0 (Windows, MSVC)
══════════════════════════════════
Archive:
<https://discuss.ocaml.org/t/ann-diskuv-ocaml-1-2-0-windows-msvc/11245/1>
jbeckford announced
───────────────────
There is a new release of the Diskuv OCaml installer available for
Windows users at
<https://github.com/diskuv/dkml-installer-ocaml/releases/tag/v1.2.0>.
It contains critical changes that were blocking some Windows users
from completing the install, and some performance improvements thanks
in large part to @edwin. The release notes have been reproduced
immediately below. It will be available using `winget install
Diskuv.OCaml' in a week or so.
/Upgrading?/ First uninstall the old Diskuv OCaml version using “Add
or remove programs” in the Control Panel.
Callout to *VirtualBox* users: You’ll need a workaround for [a not-yet
backported FMA fix] by doing the following in a PowerShell terminal
inside VirtualBox _before_ running the installer:
┌────
│ mkdir "$env:ProgramData\DiskuvOCaml\conf\"
│ Set-Content -Path "$env:ProgramData\DiskuvOCaml\conf\ocamlcompiler.sexp" -Value "((feature_flag_imprecise_c99_float_ops))"
└────
Critical changes:
• Switch from the official MSYS2 `msys2-base' install, plus a set of
MSYS2 Internet updates, to a standalone [msys2-dkml-base] that has
all the MSYS2 packages needed during installation. That removes the
Internet, GPG keys, proxies, etc. as a source of failures during the
MSYS2 sub-installation.
• Special handling for Scoop package manager on Windows which
comingles a conflicting bash.exe and git.exe in the same directory.
A prior `scoop install git' should no longer present a problem
during installation.
• Fixed: No longer need to do `opam pin remove ...' to install
`merlin' and `ocaml-lsp'.
Performance improvements:
• Plumb the number of cpus to the compiler jobs. [@edwin]
• Skip over cross-compiling support when no target ABIs specified.
• Overall shaved ~15 minutes from installation on a 3-CPU machine (80m
instead of 95m), with additional savings if you have more CPUs.
Timings in <https://github.com/diskuv/dkml-runtime-common/pull/1>
Open source help wanted:
• Byte-code only installation. That will be fast and simple and light,
and is likely the best option for students. The existing installer
already ships with a functioning `ocamlrun' and standard library,
and is “component”-based so pieces can be added or removed. No
Visual Studio, no MSYS2, no spending time compiling code during
installation. However a shim would need to be developed so that
`ocaml', `ocamlc', `utop', etc. work without setting required OCaml
environment variables. Almost all of this new byte-code only
installation can be developed on macOS or Linux. If you would like
to contribute post your github username on
<https://github.com/diskuv/dkml-installer-ocaml/issues/35>
Component upgrades:
• Bump utop from `2.9.0' to `2.10.0'.
• ocurrent ocaml/opam CI Docker image (a source of pins) updated from
2022-02-28 to 2022-11-22; numerous pins updated.
Bug fixes:
• `dkml-runtime-common-native' works with spaces in the Windows home
directory
• Removed incorrect `ptime.0.8.6' pin during `dkml init'; now
`ptime.1.1.0'
Doc fixes:
• Create `dune-project' in Beyond Basics documentation alongside
existing `dune init exe' to adhere to Dune 3.x behavior. (Dune 3.6
was added in DKML 1.1.0)
Deprecations:
• The `dkml --build-type' build type option will be removed next
release. It was originally created for Linux builds (perf and AFL
variants), and can be resurrected and simplified if and when Linux
support is added.
Internal changes:
• Added Jane Street’s `base' package to global `utop'. In particular,
`base' is now part of the `dkml' switch created during installation.
*`core' is too expensive (52 packages) to install automatically, but
you can install utop and core in your own switch.* For now this is
not that useful. The `lib/stublibs' directory of the `dkml' switch
needs to be in the PATH for `#require "base";;' to work in global
`utop'. That would help readers of the Real World OCaml book. A
future release will automate the PATH change.
• Removed `digestif.1.1.2+msvc' pin since MSVC changes upstreamed to
1.1.3.
• The bytecode `*.bc' embedded in the installer is compiled with
4.14.0 and its embedded runtime is also 4.14.0.
• When using `opam option setenv+=' stop removing the `environment'
file to force a rebuild of the environment.
• Pin `omd.1.3.1'
• Print timestamp for many logging operations to aid performance
comparisons
Patches:
• `base_bigstring.v0.15.0' for MSVC and MinGW (same in fdopen and
esy). upstream:
<https://github.com/janestreet/base_bigstring/pull/3>
• `time_now.v0.15.0' for MSVC. upstream:
<https://github.com/janestreet/time_now/issues/3>
• `core.v0.15.1' for MSVC. upstream:
<https://github.com/janestreet/core/pull/161>
• `core_kernel.v0.15.0' for MSVC. upstream:
<https://github.com/janestreet/core_kernel/pull/107>
• `alcotest.1.6.0' for MSVC. upstream:
<https://github.com/mirage/alcotest/pull/369>
• `curly.0.2.0' for Windows and MSVC (pending release; already
unblocked). upstream: <https://github.com/rgrinberg/curly/issues/10>
• `base.v0.15.1' for MSVC 32-bit. Already merged; in
v0.16~preview.127.22+307. upstream:
<https://github.com/janestreet/base/pull/128>
[a not-yet backported FMA fix]
<https://github.com/ocaml/ocaml/issues/11487>
[msys2-dkml-base]
<https://gitlab.com/diskuv-ocaml/distributions/msys2-dkml-base#msys2-dkml-base>
Simple installation of packages without network
═══════════════════════════════════════════════
Archive:
<https://discuss.ocaml.org/t/simple-installation-of-packages-without-network/11263/1>
Anthony Scemama announced
─────────────────────────
I have access to machines that don’t allow me to download anything
from the web, so I had difficulties installing software with Opam.
With the help of Raja from OCamlPro, I came to a practical solution
that solved my problem, and I turned it into a script:
[https://github.com/scemama/OpamPack] It is a simple script that makes
a tar.gz on your local machine with all the dependencies you need, and
then you can copy the `tar.gz' o the remote isolated machine and
install everything using Opam without needing the network.
[https://github.com/scemama/OpamPack]
<https://github.com/scemama/OpamPack>
Old CWN
═══════
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[Alan Schmitt]
[send me a message] <mailto:alan.schmitt at polytechnique.org>
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[Alan Schmitt] <https://alan.petitepomme.net/>
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