[Octave-bug-tracker] [bug #53943] memory usage explodes on a javaMethod call

[A.R. Burgers]

URL:
  <http://savannah.gnu.org/bugs/?53943>

                 Summary: memory usage explodes on a javaMethod call
                 Project: GNU Octave
            Submitted by: arb
            Submitted on: Sat 19 May 2018 02:07:30 PM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

with this script, that basically has one line invoking a javaMethod,


ver = version
hg_id = __octave_config_info__.hg_id

m_before = memory
dynamic_path = javaMethod ("getClassPath", "org.octave.ClassHelper")
m_after = memory


The memory.m file can be found here:

https://github.com/octave-de/macgyver_utils/blob/master/memory.m

The script outputs:


ver = 5.0.0
hg_id = 75fef3484d12+
m_before =

  scalar structure containing the fields:

    total =  660.15
    rss =  63.684
    shared =  28.328
    data =  194.57
    physical =  145319.24609

dynamic_path =
m_after =

  scalar structure containing the fields:

    total =  34653.17969
    rss =  91.375
    shared =  35.656
    data =  34165.11328
    physical =  145319.24609


Memory foot print jumps to 35 Gb. The jump is not limited to dev.

I noticed this phenomenon during an xlsopen from the io package, and narrowed
it down to this line.




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