33 lines
4.3 KiB
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33 lines
4.3 KiB
HTML
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>What you shouldn't or cannot do with this library</title><link rel="stylesheet" type="text/css" href="manual.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.0"><link rel="home" href="index.html" title="JpGraph Manual"><link rel="up" href="ch01.html" title="Chapter 1. About the library"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">What you shouldn't or cannot do with this library</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Chapter 1. About the library</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="sect1" title="What you shouldn't or cannot do with this library"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2472757"></a>What you shouldn't or cannot do with this library</h2></div></div></div>
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<p>If the primary usage is heavy scientific processing where you need to visualize
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complex 2D/3D scenarios then this library is not for you. In this case it is
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probably better to use one of the scientific tools like Matlab or Maple.</p>
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<p>In addition, if you for example intend to implement a large scale project planning
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tool with several thousand activities that you want to manipulate and display using
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the support Gantt charts in this library this is probably stretching it a bit too
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far. Again, this is probably better done with more dedicated tools like MS Project. </p>
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<p>In addition may we again point out that the library does not officially support
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any 64bit OS due to issues with PHP/GD.</p>
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<p>
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</p><div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
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<p>Some of the 2D barcodes will simply not work in a 64bit OS. This is
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consequence of the computation of the error correcting codes which in some
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instances assumes 32bit integers. For the basic graphs there is no known
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issues but since the library is not verified on a 64bit OS we do not
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officially support this.</p>
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</div><p>
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</p>
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<p>There is also a question on sever load that should be taken into account. Due to
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the CPU intensive nature of image processing the complexity of the generated images
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needs to be kept as low as possible for any sites that would expect heavy load.
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Since it is normally necessary to increase the allowed memory for PHP (see <a class="xref" href="ch03s03.html#sec3.setting-up-php-ini" title="Setting up your php.ini file">Setting up your php.ini file</a>) when working with images this could
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easily make the server hit it's physical memory limit if the load is very high. </p>
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<p>For example, the practical lowest memory that should be set for PHP when working
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with images is 32MB (recommended is at least 64MB), if your system must cope with 50
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simultaneous users it means that the HTTP processes alone will need roughly 1.6GB
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just to secure the basics. Handling 50 simultaneous executing image scripts will
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also require some heavy processing and the server needs to have a CPU capacity to
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handle this. Some discussions about dimensioning a server can be found in <a class="xref" href="ch05s06.html" title="Efficient graph generation using the built-in cache subsystem">Efficient graph generation using the built-in cache subsystem</a>.</p>
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</div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"> </td><td width="20%" align="center"><a accesskey="u" href="ch01.html">Up</a></td><td width="40%" align="right"> </td></tr><tr><td width="40%" align="left" valign="top"> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> </td></tr></table></div></body></html>
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