[Octave-bug-tracker] [bug #65240] The byte-code interpreter gets out of sync and does not release memory in certain cases

[Hendrik K]

URL:
  <https://savannah.gnu.org/bugs/?65240>

                 Summary: The byte-code interpreter gets out of sync and does
not release memory in certain cases
                   Group: GNU Octave
               Submitter: koerhen
               Submitted: Fri 02 Feb 2024 09:42:52 AM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: GNU/Linux
           Fixed Release: None
         Planned Release: None


    _______________________________________________________

Follow-up Comments:


-------------------------------------------------------
Date: Fri 02 Feb 2024 09:42:52 AM UTC By: Hendrik K <koerhen>
The byte-code interpreter seems to get out of sync in certain cases and it
appears that the memory of local variables (after exiting the function) is not
released.


Branch: bytecode-interpreter
Hg-id: 3904d7116c8c

(Note: The issue was originally detected with an older self-build version of
octave but I included the newest commits to confirm that the issue still
exists).
   


With the byte code interpreter disabled, everything works fine:

_vm_enable__(0)
octave:3> test1()
Available system memory: 55642.79 MB
Available system memory: 55646.98 MB
Available system memory: 55650.52 MB
Available system memory: 55650.41 MB
Available system memory: 55650.05 MB
Available system memory: 55655.12 MB
Available system memory: 55654.53 MB
Available system memory: 55654.67 MB
Available system memory: 55654.81 MB
Available system memory: 55658.27 MB
2.4142



With the byte-code interpreter enabled, memory does not get released.


__vm_enable__(1)
octave:3> test1()
Available system memory: 55768.84 MB
Available system memory: 55571.18 MB
Available system memory: 55377.36 MB
Available system memory: 55186.26 MB
Available system memory: 54995.40 MB
Available system memory: 54804.04 MB
Available system memory: 54608.75 MB
Available system memory: 54417.39 MB
Available system memory: 54226.53 MB
Available system memory: 54035.18 MB
2.4142



Test program test1.m


1;

function [a1,a2] = Do_Unique(a)
    [~, i_idx] = unique(a, "first");
    a1 = a(i_idx);
    a2 = sqrt(a1);
endfunction


function [retval] = OptFun(x)
   [~, refresh] = Do_Unique([1,2,1,1]);
   t_data = zeros(5000) .* x;
   retval = sum(refresh);
endfunction

for i=1:10
  a = OptFun(i);
  [~, sd] = memory(); printf("Available system memory: %7.2f
MB\n",sd.SystemMemory.Available./1024./1024);
endfor
disp(a);









    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?65240>

_______________________________________________
Message sent via Savannah
https://savannah.gnu.org/