2 <head><title>Memory Settings</title></head>
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6 <strong>Memory Usage Settings for Jalview</strong>
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9 <p>Jalview sometimes runs out of memory. This is because of the way that Java
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10 runs on a computer - what is actually run is a program called a virtual machine
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11 (the JVM) which executes the java instructions. The JVM has limits on the memory
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12 that can be allocated to the java program - and you might need to increase them
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13 if you are working with particularly large datasets.<br>
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14 If Jalview has not explicitly told you that it has run out of memory, then a
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15 common sign is that a function that normally works seems to have no effect when
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16 working with a larger set of sequences (this might include open dialog boxes
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17 for saving PNG files, or when interpreting the result of a web service calculation).</p>
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18 <p>The way you increase the memory settings for the JVM depends on which installation
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19 of Jalview you use:</p>
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21 <li><em><font size="3">Web Start Version</font></em>
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22 <p>JavaWS sets the JVM parameters through special tags in the JNLP file. You'll
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23 need to make your own jnlp file and add the following parameter into the
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24 <resources> element.
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26 <j2se version="1.4+" initial-heap-size="500M" max-heap-size="1000M"/>
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28 Save the jnlp file somewhere and then - if you start Jalview through your
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29 web browser, point your browser at the file's url, othewise simply run javaws
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30 with the file location as its argument. The file's url is something like :<br>
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32 file://<full path to file>
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34 If jalview doesn't start up, see <a href="#memsetting">below</a>. You'll have
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35 to edit the above settings in the JNLP file using a text editor, save it,
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36 and try starting Jalview with it once more.
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38 <li><em><font size="3">Install Anywhere version</font></em>
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39 <p> You need to change the InstallAnywhere configuration settings for the
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40 application. These are found in different places depending upon which operating
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43 <li><em>Unix/Windows</em>
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44 <p> Take a look inside the Jalview program installation directory (this
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45 might be in C:\Program Files\Jalview on windows). You should find a
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46 file called 'Jalview.lax' in it - make a backup, and then add the following
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47 lines to the end of the original file :
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49 lax.nl.java.option.java.heap.size.max=1000m
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50 lax.nl.java.option.java.heap.size.initial=500m
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52 Case and (lack of) spaces are important here! Do not add any spaces after
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53 the m in each line, and do not put any spaces before 'lax'.<br>
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54 Also there MUST be a carriage return after the final line.
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57 <li><em>Mac OSX</em>
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58 <p>The lines you need to change are in the <em>Info.plist</em> file inside
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59 the <em>Jalview.app/Contents</em> directory (which is where the installAnywhere
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60 installation was made) :
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62 <key&ht;VMOptions</key&ht;
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64 ! <string>-Xms2M</string>
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65 ! <string>-Xmx64M</string>
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68 Exchange the above two string tags for :
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70 <string>-Xms500M</string>
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71 <string>-Xmx1000M</string>
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76 <li><font size="3"><em>In all cases</em></font><br>
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77 Save the file and try to start Jalview in the normal way. If it doesn't start,
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80 <font size="3"><em>Jalview doesn't start... What do the memory settings mean ?<a name="memsetting"></a></em></font>
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81 <p> The 1000m value corresponds to the maximum number of megabytes of space that
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82 java objects can occupy. The 500m is the initial heap size that java will run
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83 in - increasing this can speed up memory allocation if you know you will need
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84 500 meg of memory to begin with (ie it should speed up loading large alignments).
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86 <p> If, after setting the initial and maximum heap size to some large value, you
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87 cannot actually start Jalview, then the max and initial sizes are too big for
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88 your machine (there seems to be a physical limit related to physical RAM - email
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89 the usual address to enlighten us if you know better!). Our experiments found
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90 1000m to be the biggest setting that could be used on a 1GB machine. Just try
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91 reducing the sizes until Jalview starts up properly! </p>
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