Re: [Ocamlnet-devel] Unix error 17 on nqueens example

[Pierre-Alexandre V. <ont...@gm...>]

2012/2/29 Gerd Stolpmann <in...@ge...>

> Am Sonntag, den 26.02.2012, 23:45 +0100 schrieb Pierre-Alexandre Voye:
> > Hi list,
> >
> > In my mac (Lion, 10.7) I'm unable to make nqueens example work with
> > -mp or even -sht flags
> > Here my attempts :
> >
> > $ time ./nqueens -n 3 -mp > /dev/null
> > Fatal error: exception Unix.Unix_error(17, "",
> >
> "/Users/ontologiae/Documents/Projets/COWEBO/CoweboDev/Etudes/ocamlnet-3.5/examples/multicore/run_nqueens/netplex.controller/admin")
>
> Unix error 17 = ENAMETOOLONG. You can find this out by running in the
> toploop:
>
> # (Obj.magic 17 : Unix.error);;
> - : Unix.error = Unix.ENAMETOOLONG
>

Thank you ! I didn't knew that, it will help me to investigate more by
myself.

>
> This refers to the path name of the Unix domain socket. Because of
> historical reasons, such paths are limited to 108 bytes. You can work
> around by e.g. creating a symlink to your working directory in /tmp.
>
> > time ./nqueens -n 3 -sht > /dev/null
> > Fatal error: exception Unix.Unix_error(12, "fchmod", "")
> >
> >
> > $ time ./nqueens -n 3 -mp2 > /dev/null
> > Fatal error: exception Unix.Unix_error(12, "fchmod", "")
> >
> > Is it a mac/BSD linked problem ?
>
> The fchmod problem probably is. fchmod is here called on a file
> descriptor referring to shared memory. This is strange because fchmod is
> part of the POSIX API for shared memory.
>
> Anyway, I'll just catch EINVAL and ignore it.
>

It's probably a good idea :
/tmp/multicore$ ./nqueens -mp
Problem size: 8
[Wed Feb 29 15:48:46 2012] [netmcore_0] [err] Exception in worker process
0: Unix.Unix_error(EINVAL, "fchmod", "")
Time: 0.023

>
> Gerd
>
> >
> > Regards
> >
> > Pierre-Alexandre
> >
> > --
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> >
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> Gerd Stolpmann, Darmstadt, Germany    ge...@ge...
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