/usr/share/octave/packages/java-1.2.8/javamem.m is in octave-java 1.2.8-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | ## Copyright (C) 2010 Philip Nienhuis, <prnienhuis@users.sf.net>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} javamem
## @deftypefnx {Function File} [@var{jmem}] = javamem
## Show current memory status of the Java virtual machine (JVM)
## & run garbage collector.
##
## When no return argument is given the info is echoed to the screen.
## Otherwise, output cell array @var{jmem} contains Maximum, Total,
## and Free memory (in bytes).
##
## All Java-based routines are run in the JVM's shared memory pool,
## a dedicated and separate part of memory claimed by the JVM from
## your computer's total memory (which comprises physical RAM and
## virtual memory / swap space on hard disk).
##
## The maximum available memory can be set using the file java.opts
## (in the same subdirectory where javaaddpath.m lives, see
## "which javaaddpath". Usually that is: @*
## [/usr]/share/octave/packages/java-<version>.
##
## java.opts is a plain text file, one option per line. The
## default initial memory size and default maximum memory size (which
## are both system dependent) can be overridden like so: @*
## -Xms64m @*
## -Xmx512m @*
## (in megabytes in this example.)
## You can adapt these values to your own requirements if your system
## has limited available physical memory or when you get Java memory
## errors.
##
## "Total memory" is what the operating system has currently assigned
## to the JVM and depends on actual and active memory usage.
## "Free memory" is self-explanatory. During operation of Java-based
## octave functions the amounts of Total and Free memory will vary,
## due to Java's own cleaning up and your operating system's memory
## management.
##
## @end deftypefn
## Author: Philip Nienhuis
## Created: 2010-03-25
## Updates:
## 2010-03-26 Changed name to javamem & indentation to double spaces
## 2010-08-25 Corrected text on java memory assignments
## 2010-09-05 Further overhauled help text
function [ j_mem ] = javamem ()
rt = java_invoke ('java.lang.Runtime', 'getRuntime');
rt.gc;
jmem = cell (3, 1);
jmem{1} = rt.maxMemory ().doubleValue ();
jmem{2} = rt.totalMemory ().doubleValue ();
jmem{3} = rt.freeMemory ().doubleValue ();
if (nargout < 1)
printf ("\nJava virtual machine (JVM) memory info:\n");
printf ("Maximum available memory: %5d MiB;\n", jmem{1} / 1024 / 1024);
printf (" (...running garbage collector...)\n");
printf ("OK, current status:\n");
printf ("Total memory in virtual machine: %5d MiB;\n", jmem{2} / 1024 / 1024);
printf ("Free memory in virtual machine: %5d MiB;\n", jmem{3} / 1024 / 1024);
printf ("%d CPUs available.\n", rt.availableProcessors ());
else
j_mem = jmem;
endif
endfunction
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