[Octave-bug-tracker] [bug #64017] plotting with hist() results in unnecessary big (/failing) memory allocation for some inputs.

[Martin Castillo]

URL:
  <https://savannah.gnu.org/bugs/?64017>

                 Summary: plotting with hist() results in unnecessary big
(/failing) memory allocation for some inputs.
                   Group: GNU Octave
               Submitter: castilma
               Submitted: Sat 08 Apr 2023 01:45:57 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: Martin Castillo
        Originator Email: 
             Open/Closed: Open
                 Release: 8.1.0
         Discussion Lock: Any
        Operating System: GNU/Linux
           Fixed Release: None
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Sat 08 Apr 2023 01:45:57 PM UTC By: Martin Castillo <castilma>
Consider the following three commands:

octave:26> hist(1:5,10.^(1:10))
Aoctave:27> hist(1:5,10.^(1:11))
error: out of memory or dimension too large for Octave's index type
error: called from
    __bar__ at line 237 column 16
    bar at line 117 column 18
    hist at line 249 column 5
octave:28> hist(1:5,10.^(1:12))


The first one takes about two seconds on my machine.
The second is faster and throws that error.
The third is faster and throws no error, though it has more work to do (one
more bin).

After the first command, octave uses 1GB residential memory.
After the second and third it drops down to 180MB.

You may want to disable swap (sudo swapoff -a) before executing the second
one. Otherwise your system becomes unresponsive for a while.

They all run very fast an show no error when output is expected:

[a,b] = hist(1:5, 10.^(1:11))

So I think the problem must be with the plotting subsystem.







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