From: Leo Butler <Leo.Butler@umanitoba.ca>
To: tbanelwebmin <tbanelwebmin@free.fr>
Cc: "emacs-orgmode@gnu.org" <emacs-orgmode@gnu.org>
Subject: Re: How to use mpirun with C or C++ Org-babel?
Date: Fri, 8 Dec 2023 15:47:48 +0000 [thread overview]
Message-ID: <87plzg7l25.fsf@t14.reltub.ca> (raw)
In-Reply-To: <6efe8fc4-c12f-e128-8d7e-9e32887b127c@free.fr> (tbanelwebmin@free.fr's message of "Fri, 8 Dec 2023 11:36:02 +0100")
On Fri, Dec 08 2023, tbanelwebmin <tbanelwebmin@free.fr> wrote:
> Caution: This message was sent from outside the University of Manitoba.
>
> On 23-12-08 00:10, Edgar Lux wrote:
>
> Hello, I found [1][2] that it is possible to change the compiler for C and C++
> source blocks. I would like to know if there is a way to add =mpirun -np 2=
> (where 2 can be any other number) to run the resulting executable. Thanks! [1]
> https://orgmode.org/worg//org-contrib/babel/languages/ob-doc-C.html [2]
> https://github.com/gheber/literate-hdf5
>
> I guess you want to run the executable after it has been compiled, with a command
> like this one:
>
> mpirun -np 2 /tmp/babel-ad2pdk/C-bin-JTvjS4
>
> Currently it is not possible.
>
> There is the :cmdline specifier which adds parameters to the executable, like this:
>
> #+begin_src C++ :cmdline AAA BBB CCC
> int main (int nargs, char** argv)
> {
> // argv will be {
> // "/tmp/babel-ad2pdk/C-bin-JTvjS4",
> // "AAA",
> // "BBB",
> // "CCC"
> // }
> }
> #+end_src
>
> Those parameters come AFTER the executable, whereas mpirun should come BEFORE the
> executable.
>
> An extension may be written in ob-C.el, in the org-babel-C-execute function.
> The relevant line is:
> (concat tmp-bin-file cmdline)
>
> If you want to contribute...
If you are wanting to run jobs with mpirun, then I will guess that they
are relatively long-running. However, ob-C.el does not support
asynchronous (background) execution, so your emacs would be tied up for
the duration. I doubt you want that.
I submitted an imperfect patch some time ago [1] that targeted your use
case: allow ob-C.el to create a named binary. Unfortunately, Ihor
dropped the issue due to lack of interest from other users.
My goal was to enable something like this to work:
#+begin_src cpp :includes <iostream> :results none :file ./hello-world
std::cout << "Hello World!\n";
#+end_src
#+begin_src bash :async t
mpirun -np 4 ./hello-world
#+end_src
As I said, the patch I wrote was not perfect, but I am happy to re-visit
the issue. The ability to create named binaries would significantly
increase the usability of ob-C for projects where you want to compile
the source once and run the binary repeatedly for potentially long
periods of time.
Leo
[1] https://list.orgmode.org/87fs81egk5.fsf@t14.reltub.ca/
next prev parent reply other threads:[~2023-12-08 15:48 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-07 23:10 How to use mpirun with C or C++ Org-babel? Edgar Lux
2023-12-08 10:36 ` tbanelwebmin
2023-12-08 15:47 ` Leo Butler [this message]
2023-12-08 22:24 ` Ihor Radchenko
2023-12-13 16:09 ` Leo Butler
2023-12-14 14:08 ` Ihor Radchenko
2023-12-19 22:14 ` [PATCH] ob-C.el compile-only header argument, was " Leo Butler
2023-12-22 12:20 ` Ihor Radchenko
2024-01-04 17:53 ` Leo Butler
2024-01-05 12:47 ` Ihor Radchenko
2023-12-20 18:15 ` Leo Butler
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