Mercurial > hg > octave-nkf
annotate scripts/java/javamem.m @ 20750:3339c9bdfe6a
Activate FSAL property in dorpri timestepper
* scripts/ode/private/runge_kutta_45_dorpri.m: don't compute
first stage if values from previous iteration are passed.
* scripts/ode/private/integrate_adaptive.m: do not update
cmputed stages if timestep is rejected.
author | Carlo de Falco <carlo.defalco@polimi.it> |
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date | Sat, 03 Oct 2015 07:32:50 +0200 |
parents | aa36fb998a4d |
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rev | line source |
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1 ## Copyright (C) 2010, 2013 Philip Nienhuis |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 3 of the License, or (at |
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8 ## your option) any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} javamem () |
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21 ## @deftypefnx {Function File} {@var{jmem} =} javamem () |
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22 ## Show the current memory usage of the Java virtual machine (JVM) and run the |
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23 ## garbage collector. |
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24 ## |
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25 ## When no return argument is given the info is printed to the screen. |
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26 ## Otherwise, the output cell array @var{jmem} contains Maximum, Total, and |
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27 ## Free memory (in bytes). |
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28 ## |
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29 ## All Java-based routines are run in the JVM's shared memory pool, a |
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30 ## dedicated and separate part of memory claimed by the JVM from your |
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31 ## computer's total memory (which comprises physical RAM and virtual memory / |
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32 ## swap space on hard disk). |
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33 ## |
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34 ## The maximum allowable memory usage can be configured using the file |
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35 ## @file{java.opts}. The directory where this file resides is determined by |
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36 ## the environment variable @w{@env{OCTAVE_JAVA_DIR}}. If unset, the directory |
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37 ## where @file{javaaddpath.m} resides is used instead (typically |
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38 ## @file{@w{@env{OCTAVE_HOME}}/share/octave/@w{@env{OCTAVE_VERSION}}/m/java/}). |
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39 ## |
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40 ## @file{java.opts} is a plain text file with one option per line. The default |
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41 ## initial memory size and default maximum memory size (which are both system |
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42 ## dependent) can be overridden like so: |
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43 ## |
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44 ## @nospell{-Xms64m} |
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45 ## |
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46 ## @nospell{-Xmx512m} |
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47 ## |
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48 ## (in megabytes in this example). |
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49 ## You can adapt these values to your own requirements if your system has |
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50 ## limited available physical memory or if you get Java memory errors. |
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51 ## |
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52 ## @qcode{"Total memory"} is what the operating system has currently assigned |
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53 ## to the JVM and depends on actual and active memory usage. |
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54 ## @qcode{"Free memory"} is self-explanatory. During operation of Java-based |
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55 ## Octave functions the amount of Total and Free memory will vary, due to |
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56 ## Java's own cleaning up and your operating system's memory management. |
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57 ## @end deftypefn |
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58 |
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59 ## Author: Philip Nienhuis |
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60 ## Created: 2010-03-25 |
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61 ## Updates: |
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62 ## 2010-03-26 Changed name to javamem & indentation to double spaces |
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63 ## 2010-08-25 Corrected text on java memory assignments |
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64 ## 2010-09-05 Further overhauled help text |
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65 |
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66 function jmem = javamem () |
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67 |
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68 rt = javaMethod ("getRuntime", "java.lang.Runtime"); |
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69 rt.gc; |
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70 jvmem = cell (3, 1); |
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71 jvmem{1} = rt.maxMemory (); |
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72 jvmem{2} = rt.totalMemory (); |
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73 jvmem{3} = rt.freeMemory (); |
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74 |
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75 if (nargout == 0) |
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76 printf ("\nJava virtual machine (JVM) memory info:\n"); |
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77 printf ("Maximum available memory: %5d MiB;\n", |
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78 jvmem{1} / 1024 / 1024); |
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79 printf (" (...running garbage collector...)\n"); |
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80 printf ("OK, current status:\n"); |
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81 printf ("Total memory in virtual machine: %5d MiB;\n", |
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82 jvmem{2} / 1024 / 1024); |
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83 printf ("Free memory in virtual machine: %5d MiB;\n", |
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84 jvmem{3} / 1024 / 1024); |
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85 printf ("%d CPUs available.\n", rt.availableProcessors ()); |
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86 else |
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87 jmem = jvmem; |
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88 endif |
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89 |
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90 endfunction |
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91 |