Allow concurrent exec with watch mode #11840

gridbugs · 2025-05-23T06:56:37Z

This change allows a limited version of dune exec to run at the same time as dune is running in watch mode. This allows users to run example programs without needing to stop their watch server. This works by sending messages to the RPC server to build the executable if necessary.

Leonidas-from-XIV · 2025-05-23T11:07:52Z

Thanks for the PR, it'll be easier to review once #11833 is merged.

gridbugs · 2025-05-27T06:40:36Z

I've added a bunch of #11833 into this PR. Once #11833 is merged this diff will get much smaller.

Leonidas-from-XIV · 2025-06-06T09:41:31Z

@gridbugs Can you rebase, now that #11833 is merged?

gridbugs · 2025-06-09T02:45:10Z

Will do. I was waiting for #11879 to be merged first as it changes a lot of code in exec.ml.

gridbugs · 2025-06-11T08:09:44Z

@Leonidas-from-XIV all the prereqs for this are now merged. Can you please take a look.

Leonidas-from-XIV

Very useful work, however I am concerned about the maintainability if the tests are disabled for being flaky. Is there maybe some way to make them more stable?

src/dune_util/global_lock.mli

test/blackbox-tests/test-cases/watching/dune

test/blackbox-tests/test-cases/watching/watching-eager-concurrent-exec-command.t

bin/exec.ml

Alizter · 2025-06-11T09:30:54Z

test/blackbox-tests/test-cases/watching/watching-eager-concurrent-exec-command.t

+  Hello, World!
+
+  $ dune shutdown
+  $ wait


Why are we waiting at the end?

My intention is to wait for the background process started by dune build README.md --watch & to terminate before exiting the test.

gridbugs · 2025-06-12T03:06:44Z

Very useful work, however I am concerned about the maintainability if the tests are disabled for being flaky. Is there maybe some way to make them more stable?

Flaky watch-mode tests is something that has plagued dune for as long as I've worked on it and I'm not sure what exactly we can do about it. @Alizter I recall you doing some work on this recently?

Alizter · 2025-06-12T09:43:11Z

@gridbugs I fixed it somewhat with #11827 and then it was decided a more general approach as in #11841 would be a better fit. The issue in the latter is that the CI is still a bit flaky for some reason.

Leonidas-from-XIV

My only remaining complaint is that I don't like how the utility functions controls the output prettyprinting of the type, I believe the way that the PID is printed should be done in the bin/* modules.

src/dune_util/global_lock.mli

bin/exec.ml

This change allows a limited version of `dune exec` to run at the same time as dune is running in watch mode. This allows users to run example programs without needing to stop their watch server. This works by sending messages to the RPC server to build the executable if necessary. Signed-off-by: Stephen Sherratt <[email protected]>

@rgrinberg

CHANGES: ### Fixed - Stop re-running cram tests after promotion when it's not necessary (ocaml/dune#11994, @rgrinberg) - fix: `$ dune subst` should not fail when adding the version field in opam files (ocaml/dune#11801, fixes ocaml/dune#11045, @btjorge) - Kill all processes in the process group after the main process has terminated; in particular this avoids background processes in cram tests to stick around after the test finished (ocaml/dune#11841, fixes ocaml/dune#11820, @Alizter, @Leonidas-from-XIV) ### Added - `(tests)` stanzas now generate aliases with the test name. To run `(test (name a))` you can do `dune build @runtest-a`. (ocaml/dune#11558, grants part of ocaml/dune#10239, @Alizter) - Inline test libraries now produce aliases `runtest-name_of_lib` allowing users to run specific inline tests as `dune build @runtest-name_of_lib`. (ocaml/dune#11109, partially fixes ocaml/dune#10239, @Alizter) - feature: `$ dune subst` use version from `dune-project` when no version control repository has been detected (ocaml/dune#11801, @btjorge) - Allow `dune exec` to run concurrently with another instance of dune in watch mode (ocaml/dune#11840, @gridbugs) - Introduce `%{os}`, `%{os_version}`, `%{os_distribution}`, and `%{os_family}` percent forms. These have the same values as their opam counterparts. (ocaml/dune#11863, @rgrinberg) - Introduce option `(implicit_transitive_deps false-if-hidden-includes-supported)` that is equivalent to `(implicit_transitive_deps false)` when `-H` is supported by the compiler (OCaml >= 5.2) and equivalent to `(implicit_transitive_deps true)` otherwise. (ocaml/dune#11866, fixes ocaml/dune#11212, @nojb) - Add `dune describe location` for printing the path to the executable that would be run (ocaml/dune#11905, @gridbugs) - `dune runtest` can now understand absolute paths as well as run tests in specific build contexts (ocaml/dune#11936, @Alizter). - Added 'empty' alias which contains no targets. (ocaml/dune#11556 ocaml/dune#11952 ocaml/dune#11955 ocaml/dune#11956, grants ocaml/dune#4161, @Alizter and @rgrinberg) - Allow `dune promote` to properly run while a watch mode server is running (ocaml/dune#12010, @ElectreAAS) - Add `--alias` and `--alias-rec` flags as an alternative to the `@` and `@@` syntax in the command line (ocaml/dune#12043, fixes ocaml/dune#5775, @rgrinberg) ### Changed - Format long lists in s-expressions to fill the line instead of formatting them in a vertical way (ocaml/dune#10892, fixes ocaml/dune#10860, @nojb) - Switch from MD5 to BLAKE3 for digesting targets and rules. BLAKE3 is both more performant and difficult to break than MD5 (ocaml/dune#11735, @rgrinberg, @Alizter) - Print a warning when `dune build` runs over RPC (ocaml/dune#11836, @gridbugs) - Stop emitting empty module group wrapper `.js` file in `melange.emit` (ocaml/dune#11987, fixes ocaml/dune#11986, @anmonteiro)

@rgrinberg

CHANGES: ### Fixed - Stop re-running cram tests after promotion when it's not necessary (ocaml/dune#11994, @rgrinberg) - fix: `$ dune subst` should not fail when adding the version field in opam files (ocaml/dune#11801, fixes ocaml/dune#11045, @btjorge) - Kill all processes in the process group after the main process has terminated; in particular this avoids background processes in cram tests to stick around after the test finished (ocaml/dune#11841, fixes ocaml/dune#11820, @Alizter, @Leonidas-from-XIV) ### Added - `(tests)` stanzas now generate aliases with the test name. To run `(test (name a))` you can do `dune build @runtest-a`. (ocaml/dune#11558, grants part of ocaml/dune#10239, @Alizter) - Inline test libraries now produce aliases `runtest-name_of_lib` allowing users to run specific inline tests as `dune build @runtest-name_of_lib`. (ocaml/dune#11109, partially fixes ocaml/dune#10239, @Alizter) - feature: `$ dune subst` use version from `dune-project` when no version control repository has been detected (ocaml/dune#11801, @btjorge) - Allow `dune exec` to run concurrently with another instance of dune in watch mode (ocaml/dune#11840, @gridbugs) - Introduce `%{os}`, `%{os_version}`, `%{os_distribution}`, and `%{os_family}` percent forms. These have the same values as their opam counterparts. (ocaml/dune#11863, @rgrinberg) - Introduce option `(implicit_transitive_deps false-if-hidden-includes-supported)` that is equivalent to `(implicit_transitive_deps false)` when `-H` is supported by the compiler (OCaml >= 5.2) and equivalent to `(implicit_transitive_deps true)` otherwise. (ocaml/dune#11866, fixes ocaml/dune#11212, @nojb) - Add `dune describe location` for printing the path to the executable that would be run (ocaml/dune#11905, @gridbugs) - `dune runtest` can now understand absolute paths as well as run tests in specific build contexts (ocaml/dune#11936, @Alizter). - Added 'empty' alias which contains no targets. (ocaml/dune#11556 ocaml/dune#11952 ocaml/dune#11955 ocaml/dune#11956, grants ocaml/dune#4161, @Alizter and @rgrinberg) - Allow `dune promote` to properly run while a watch mode server is running (ocaml/dune#12010, @ElectreAAS) - Add `--alias` and `--alias-rec` flags as an alternative to the `@@` and `@` syntax in the command line (ocaml/dune#12043, fixes ocaml/dune#5775, @rgrinberg) - Added a `(timeout <float>)` field to the `(cram)` stanza to specify per-test time limits. Tests exceeding the timeout are terminated with an error. (ocaml/dune#12041, @Alizter) ### Changed - Format long lists in s-expressions to fill the line instead of formatting them in a vertical way (ocaml/dune#10892, fixes ocaml/dune#10860, @nojb) - Switch from MD5 to BLAKE3 for digesting targets and rules. BLAKE3 is both more performant and difficult to break than MD5 (ocaml/dune#11735, @rgrinberg, @Alizter) - Print a warning when `dune build` runs over RPC (ocaml/dune#11833, @gridbugs) - Stop emitting empty module group wrapper `.js` file in `melange.emit` (ocaml/dune#11987, fixes ocaml/dune#11986, @anmonteiro)

@rgrinberg

CHANGES: ### Fixed - Stop re-running cram tests after promotion when it's not necessary (ocaml/dune#11994, @rgrinberg) - fix: `$ dune subst` should not fail when adding the version field in opam files (ocaml/dune#11801, fixes ocaml/dune#11045, @btjorge) - Kill all processes in the process group after the main process has terminated; in particular this avoids background processes in cram tests to stick around after the test finished (ocaml/dune#11841, fixes ocaml/dune#11820, @Alizter, @Leonidas-from-XIV) ### Added - `(tests)` stanzas now generate aliases with the test name. To run `(test (name a))` you can do `dune build @runtest-a`. (ocaml/dune#11558, grants part of ocaml/dune#10239, @Alizter) - Inline test libraries now produce aliases `runtest-name_of_lib` allowing users to run specific inline tests as `dune build @runtest-name_of_lib`. (ocaml/dune#11109, partially fixes ocaml/dune#10239, @Alizter) - feature: `$ dune subst` use version from `dune-project` when no version control repository has been detected (ocaml/dune#11801, @btjorge) - Allow `dune exec` to run concurrently with another instance of dune in watch mode (ocaml/dune#11840, @gridbugs) - Introduce `%{os}`, `%{os_version}`, `%{os_distribution}`, and `%{os_family}` percent forms. These have the same values as their opam counterparts. (ocaml/dune#11863, @rgrinberg) - Introduce option `(implicit_transitive_deps false-if-hidden-includes-supported)` that is equivalent to `(implicit_transitive_deps false)` when `-H` is supported by the compiler (OCaml >= 5.2) and equivalent to `(implicit_transitive_deps true)` otherwise. (ocaml/dune#11866, fixes ocaml/dune#11212, @nojb) - Add `dune describe location` for printing the path to the executable that would be run (ocaml/dune#11905, @gridbugs) - `dune runtest` can now understand absolute paths as well as run tests in specific build contexts (ocaml/dune#11936, @Alizter). - Added 'empty' alias which contains no targets. (ocaml/dune#11556 ocaml/dune#11952 ocaml/dune#11955 ocaml/dune#11956, grants ocaml/dune#4161, @Alizter and @rgrinberg) - Allow `dune promote` to properly run while a watch mode server is running (ocaml/dune#12010, @ElectreAAS) - Add `--alias` and `--alias-rec` flags as an alternative to the `@@` and `@` syntax in the command line (ocaml/dune#12043, fixes ocaml/dune#5775, @rgrinberg) - Added a `(timeout <float>)` field to the `(cram)` stanza to specify per-test time limits. Tests exceeding the timeout are terminated with an error. (ocaml/dune#12041, @Alizter) ### Changed - Format long lists in s-expressions to fill the line instead of formatting them in a vertical way (ocaml/dune#10892, fixes ocaml/dune#10860, @nojb) - Switch from MD5 to BLAKE3 for digesting targets and rules. BLAKE3 is both more performant and difficult to break than MD5 (ocaml/dune#11735, @rgrinberg, @Alizter) - Print a warning when `dune build` runs over RPC (ocaml/dune#11833, @gridbugs) - Stop emitting empty module group wrapper `.js` file in `melange.emit` (ocaml/dune#11987, fixes ocaml/dune#11986, @anmonteiro)

@rgrinberg

CHANGES: ### Fixed - Stop re-running cram tests after promotion when it's not necessary (ocaml/dune#11994, @rgrinberg) - fix: `$ dune subst` should not fail when adding the version field in opam files (ocaml/dune#11801, fixes ocaml/dune#11045, @btjorge) - Kill all processes in the process group after the main process has terminated; in particular this avoids background processes in cram tests to stick around after the test finished (ocaml/dune#11841, fixes ocaml/dune#11820, @Alizter, @Leonidas-from-XIV) ### Added - `(tests)` stanzas now generate aliases with the test name. To run `(test (name a))` you can do `dune build @runtest-a`. (ocaml/dune#11558, grants part of ocaml/dune#10239, @Alizter) - Inline test libraries now produce aliases `runtest-name_of_lib` allowing users to run specific inline tests as `dune build @runtest-name_of_lib`. (ocaml/dune#11109, partially fixes ocaml/dune#10239, @Alizter) - feature: `$ dune subst` use version from `dune-project` when no version control repository has been detected (ocaml/dune#11801, @btjorge) - Allow `dune exec` to run concurrently with another instance of dune in watch mode (ocaml/dune#11840, @gridbugs) - Introduce `%{os}`, `%{os_version}`, `%{os_distribution}`, and `%{os_family}` percent forms. These have the same values as their opam counterparts. (ocaml/dune#11863, @rgrinberg) - Introduce option `(implicit_transitive_deps false-if-hidden-includes-supported)` that is equivalent to `(implicit_transitive_deps false)` when `-H` is supported by the compiler (OCaml >= 5.2) and equivalent to `(implicit_transitive_deps true)` otherwise. (ocaml/dune#11866, fixes ocaml/dune#11212, @nojb) - Add `dune describe location` for printing the path to the executable that would be run (ocaml/dune#11905, @gridbugs) - `dune runtest` can now understand absolute paths as well as run tests in specific build contexts (ocaml/dune#11936, @Alizter). - Added 'empty' alias which contains no targets. (ocaml/dune#11556 ocaml/dune#11952 ocaml/dune#11955 ocaml/dune#11956, grants ocaml/dune#4161, @Alizter and @rgrinberg) - Allow `dune promote` to properly run while a watch mode server is running (ocaml/dune#12010, @ElectreAAS) - Add `--alias` and `--alias-rec` flags as an alternative to the `@@` and `@` syntax in the command line (ocaml/dune#12043, fixes ocaml/dune#5775, @rgrinberg) - Added a `(timeout <float>)` field to the `(cram)` stanza to specify per-test time limits. Tests exceeding the timeout are terminated with an error. (ocaml/dune#12041, @Alizter) ### Changed - Format long lists in s-expressions to fill the line instead of formatting them in a vertical way (ocaml/dune#10892, fixes ocaml/dune#10860, @nojb) - Switch from MD5 to BLAKE3 for digesting targets and rules. BLAKE3 is both more performant and difficult to break than MD5 (ocaml/dune#11735, @rgrinberg, @Alizter) - Print a warning when `dune build` runs over RPC (ocaml/dune#11833, @gridbugs) - Stop emitting empty module group wrapper `.js` file in `melange.emit` (ocaml/dune#11987, fixes ocaml/dune#11986, @anmonteiro)

@rgrinberg

CHANGES: ### Fixed - Stop re-running cram tests after promotion when it's not necessary (ocaml/dune#11994, @rgrinberg) - fix: `$ dune subst` should not fail when adding the version field in opam files (ocaml/dune#11801, fixes ocaml/dune#11045, @btjorge) - Kill all processes in the process group after the main process has terminated; in particular this avoids background processes in cram tests to stick around after the test finished (ocaml/dune#11841, fixes ocaml/dune#11820, @Alizter, @Leonidas-from-XIV) ### Added - `(tests)` stanzas now generate aliases with the test name. To run `(test (name a))` you can do `dune build @runtest-a`. (ocaml/dune#11558, grants part of ocaml/dune#10239, @Alizter) - Inline test libraries now produce aliases `runtest-name_of_lib` allowing users to run specific inline tests as `dune build @runtest-name_of_lib`. (ocaml/dune#11109, partially fixes ocaml/dune#10239, @Alizter) - feature: `$ dune subst` use version from `dune-project` when no version control repository has been detected (ocaml/dune#11801, @btjorge) - Allow `dune exec` to run concurrently with another instance of dune in watch mode (ocaml/dune#11840, @gridbugs) - Introduce `%{os}`, `%{os_version}`, `%{os_distribution}`, and `%{os_family}` percent forms. These have the same values as their opam counterparts. (ocaml/dune#11863, @rgrinberg) - Introduce option `(implicit_transitive_deps false-if-hidden-includes-supported)` that is equivalent to `(implicit_transitive_deps false)` when `-H` is supported by the compiler (OCaml >= 5.2) and equivalent to `(implicit_transitive_deps true)` otherwise. (ocaml/dune#11866, fixes ocaml/dune#11212, @nojb) - Add `dune describe location` for printing the path to the executable that would be run (ocaml/dune#11905, @gridbugs) - `dune runtest` can now understand absolute paths as well as run tests in specific build contexts (ocaml/dune#11936, @Alizter). - Added 'empty' alias which contains no targets. (ocaml/dune#11556 ocaml/dune#11952 ocaml/dune#11955 ocaml/dune#11956, grants ocaml/dune#4161, @Alizter and @rgrinberg) - Allow `dune promote` to properly run while a watch mode server is running (ocaml/dune#12010, @ElectreAAS) - Add `--alias` and `--alias-rec` flags as an alternative to the `@@` and `@` syntax in the command line (ocaml/dune#12043, fixes ocaml/dune#5775, @rgrinberg) - Added a `(timeout <float>)` field to the `(cram)` stanza to specify per-test time limits. Tests exceeding the timeout are terminated with an error. (ocaml/dune#12041, @Alizter) ### Changed - Format long lists in s-expressions to fill the line instead of formatting them in a vertical way (ocaml/dune#10892, fixes ocaml/dune#10860, @nojb) - Switch from MD5 to BLAKE3 for digesting targets and rules. BLAKE3 is both more performant and difficult to break than MD5 (ocaml/dune#11735, @rgrinberg, @Alizter) - Print a warning when `dune build` runs over RPC (ocaml/dune#11833, @gridbugs) - Stop emitting empty module group wrapper `.js` file in `melange.emit` (ocaml/dune#11987, fixes ocaml/dune#11986, @anmonteiro)

@rgrinberg

CHANGES: ### Fixed - Stop re-running cram tests after promotion when it's not necessary (ocaml/dune#11994, @rgrinberg) - fix: `$ dune subst` should not fail when adding the version field in opam files (ocaml/dune#11801, fixes ocaml/dune#11045, @btjorge) - Kill all processes in the process group after the main process has terminated; in particular this avoids background processes in cram tests to stick around after the test finished (ocaml/dune#11841, fixes ocaml/dune#11820, @Alizter, @Leonidas-from-XIV) ### Added - `(tests)` stanzas now generate aliases with the test name. To run `(test (name a))` you can do `dune build @runtest-a`. (ocaml/dune#11558, grants part of ocaml/dune#10239, @Alizter) - Inline test libraries now produce aliases `runtest-name_of_lib` allowing users to run specific inline tests as `dune build @runtest-name_of_lib`. (ocaml/dune#11109, partially fixes ocaml/dune#10239, @Alizter) - feature: `$ dune subst` use version from `dune-project` when no version control repository has been detected (ocaml/dune#11801, @btjorge) - Allow `dune exec` to run concurrently with another instance of dune in watch mode (ocaml/dune#11840, @gridbugs) - Introduce `%{os}`, `%{os_version}`, `%{os_distribution}`, and `%{os_family}` percent forms. These have the same values as their opam counterparts. (ocaml/dune#11863, @rgrinberg) - Introduce option `(implicit_transitive_deps false-if-hidden-includes-supported)` that is equivalent to `(implicit_transitive_deps false)` when `-H` is supported by the compiler (OCaml >= 5.2) and equivalent to `(implicit_transitive_deps true)` otherwise. (ocaml/dune#11866, fixes ocaml/dune#11212, @nojb) - Add `dune describe location` for printing the path to the executable that would be run (ocaml/dune#11905, @gridbugs) - `dune runtest` can now understand absolute paths as well as run tests in specific build contexts (ocaml/dune#11936, @Alizter). - Added 'empty' alias which contains no targets. (ocaml/dune#11556 ocaml/dune#11952 ocaml/dune#11955 ocaml/dune#11956, grants ocaml/dune#4161, @Alizter and @rgrinberg) - Allow `dune promote` to properly run while a watch mode server is running (ocaml/dune#12010, @ElectreAAS) - Add `--alias` and `--alias-rec` flags as an alternative to the `@@` and `@` syntax in the command line (ocaml/dune#12043, fixes ocaml/dune#5775, @rgrinberg) - Added a `(timeout <float>)` field to the `(cram)` stanza to specify per-test time limits. Tests exceeding the timeout are terminated with an error. (ocaml/dune#12041, @Alizter) ### Changed - Format long lists in s-expressions to fill the line instead of formatting them in a vertical way (ocaml/dune#10892, fixes ocaml/dune#10860, @nojb) - Switch from MD5 to BLAKE3 for digesting targets and rules. BLAKE3 is both more performant and difficult to break than MD5 (ocaml/dune#11735, @rgrinberg, @Alizter) - Print a warning when `dune build` runs over RPC (ocaml/dune#11833, @gridbugs) - Stop emitting empty module group wrapper `.js` file in `melange.emit` (ocaml/dune#11987, fixes ocaml/dune#11986, @anmonteiro)

yakobowski · 2025-10-03T16:04:46Z

This looks very nice, thanks a lot!! Would this MR solve #8114 too by any chance?

shonfeder · 2025-10-03T17:45:36Z

@yakobowski the part of that relating to tests is being addressed in #12473

gridbugs requested review from Alizter, Leonidas-from-XIV and rgrinberg May 23, 2025 06:56

gridbugs force-pushed the exec-concurrent-with-watch-mode branch from 1d6ea1e to 09a0dbe Compare May 23, 2025 06:58

gridbugs changed the title ~~Allow concurrent with watch mode~~ Allow concurrent exec with watch mode May 26, 2025

gridbugs force-pushed the exec-concurrent-with-watch-mode branch from 09a0dbe to 63481de Compare May 27, 2025 06:38

gridbugs force-pushed the exec-concurrent-with-watch-mode branch 3 times, most recently from f3b6fe0 to 171c7a3 Compare June 2, 2025 06:36

gridbugs force-pushed the exec-concurrent-with-watch-mode branch 2 times, most recently from 32a0082 to b91cfa6 Compare June 11, 2025 07:45

Leonidas-from-XIV requested changes Jun 11, 2025

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gridbugs force-pushed the exec-concurrent-with-watch-mode branch from b91cfa6 to 1254b46 Compare June 12, 2025 03:03

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gridbugs force-pushed the exec-concurrent-with-watch-mode branch 2 times, most recently from 4bcb45d to 857372c Compare June 18, 2025 05:22

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gridbugs force-pushed the exec-concurrent-with-watch-mode branch from 857372c to 5e8dbb9 Compare June 19, 2025 11:18

gridbugs merged commit c6f8143 into ocaml:main Jun 19, 2025
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ElectreAAS mentioned this pull request Jul 2, 2025

[RPC] Allow formatting while watch server is running #11958

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maiste mentioned this pull request Jul 28, 2025

[new release] dune (15 packages) (3.20.0~alpha0) ocaml/opam-repository#28267

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[new release] dune (15 packages) (3.20.0~alpha1) ocaml/opam-repository#28276

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[new release] dune (15 packages) (3.20.0~alpha2) ocaml/opam-repository#28298

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[new release] dune (15 packages) (3.20.0~alpha3) ocaml/opam-repository#28302

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[new release] dune (15 packages) (3.20.0~alpha4) ocaml/opam-repository#28333

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[new release] dune (15 packages) (3.20.0) ocaml/opam-repository#28357

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ElectreAAS mentioned this pull request Oct 14, 2025

Running tests and exec-ing executables should be possible while build server is running #8114

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Allow concurrent exec with watch mode #11840

Allow concurrent exec with watch mode #11840

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shonfeder commented Oct 3, 2025 •

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