[Octave-bug-tracker] [bug #59952] Octave parallel package: Command line function call issues

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?59952>

                 Summary: Octave parallel package: Command line function call
issues
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Wed 27 Jan 2021 04:48:36 AM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error or Warning
                  Status: None
             Assigned to: None
         Originator Name: Stavros Kousidis
        Originator Email: st.kousidis@gmail.com
             Open/Closed: Open
                 Release: 6.1.0
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

I have trouble calling a command line function with pararrayfun (likewise for
parcellfun). When I execute the following code:


pkg load parallel

function retval = mul(x,y)
  retval = x*y;
endfunction

vector_x = 1:2^3;
vector_y = 1:2^3;

vector_z = pararrayfun(nproc, @(x,y) mul(x,y), vector_x, vector_y)
vector_z = pararrayfun(nproc, @(x,y) x*y, vector_x, vector_y)


I get the following output:


vector_z =

  -1  -1  -1  -1  -1  -1  -1  -1

vector_z =

    1    4    9   16   25   36   49   64


That is, the call to the command line function does not seem to work, whereas
the same as an anonymous function calling the built-in multiplication is
working.

The maching is x86_64 with Debian bullseye and 5.10.0-1-amd64 kernel. Octave's
version is 6.1.1~hg.2020.12.27-1. The `pkg list` command gives me:


Package Name  | Version | Installation directory
--------------+---------+-----------------------
   dataframe  |   1.2.0 | /usr/share/octave/packages/dataframe-1.2.0
    parallel *|   4.0.0 | /usr/share/octave/packages/parallel-4.0.0
      struct *|  1.0.16 | /usr/share/octave/packages/struct-1.0.16


The same code works flawless on armv7l with Debian buster and
4.14.150-odroidxu4 kernel. That is the call to the command line function and
the built-in multiplication function produce the output:


parcellfun: 8/8 jobs done
vector_z =

    1    4    9   16   25   36   49   64

parcellfun: 8/8 jobs done
vector_z =

    1    4    9   16   25   36   49   64


On that machine Octave's version is 4.4.1 and `pkg list` gives:



Package Name  | Version | Installation directory
--------------+---------+-----------------------
   dataframe  |   1.2.0 | /usr/share/octave/packages/dataframe-1.2.0
    parallel *|   3.1.3 | /usr/share/octave/packages/parallel-3.1.3
      struct *|  1.0.15 | /usr/share/octave/packages/struct-1.0.15


This behavior with a workaround has been posted on Stack Overflow here:

https://stackoverflow.com/q/65898175/15081838
<https://stackoverflow.com/q/65898175/15081838>

It has also been suggested to submit it as a potential bug.




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