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<title>Platforms, applications, and versions</title>
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<body bgcolor=ffffff>
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<h2>Platforms, applications, and versions</h2>
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<p>
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A <b>platform</b> is a compilation target (Windows/Intel,
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Linux/Intel, MacOS/PPC, etc.).
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Platforms are maintained in the <b>platform</b> table in the BOINC DB,
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and can be created using the <a href=tools_other.html>add</a> utility.
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<p>
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An <b>application</b> consists of an executable program,
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perhaps with versions for various platforms.
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A project can operate many applications.
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Applications are maintained in the <b>application</b> table in the BOINC DB,
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and can be created using the <a href=tools_other.html>add</a> utility.
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<p>
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An application program may go through a sequence of
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<a href=version.html>versions</a>.
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A particular version, compiled for a particular platform, is
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called an <b>application version</b>.
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An application version can consist of multiple files: for example, a
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controller script, pre- and post-processing programs, and a primary.
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<p>
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Each application version has an integer <b>version number</b>.
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Projects can assign version numbers however they like; for example,
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version 304 might represent major version 3 and minor version 4.
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Version numbers should be used consistently across platforms;
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Windows version 304 should be computationally identical to
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Mac version 304.
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<p>
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Each application has a <b>minimum version</b>.
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When a client is sent work for an application, it is also sent
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the latest application version for its platform.
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It is sent work only if this version is the minimum or greater.
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<p>
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Application versions are maintained in the <b>app_version</b> table
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in the BOINC DB, Each entry includes an XML document describing the
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files that make up the application version:
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<pre>
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<file_info> ...
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</file_info>
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[ ...
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]
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<app_version>
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<app_name>foobar</app_name>
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<version_num>4</version_num>
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<file_ref>
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<file_name>program_1</file_name>
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<main_program/>
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</file_ref>
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<file_ref>
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<file_name>library_12</file_name>
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</file_ref>
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</app_version>
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</pre>
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The <a href=tools_other.html>add</a> utility provides a
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simplified interface for creating application versions.
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