mirror of https://github.com/BOINC/boinc.git
58 lines
1.8 KiB
PHP
58 lines
1.8 KiB
PHP
<?
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require_once("docutil.php");
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page_head("Back end daemons");
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echo "
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<p>
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A project <b>back end</b> consists of a set of daemons
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(programs that run all the time),
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some of which have application-specific parts.
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Each program should be listed as a daemon in the
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<a href=configuration.php>config.xml</a> file.
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<h3>Work generation</h3>
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<p>
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There is one work generator per application.
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It creates workunits and the corresponding input files.
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It is application-specific, and uses
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<a href=tools_work.php>BOINC-supplied interfaces</a>
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for registering the workunits in the database.
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<p>
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During testing, you can create a single workunit using
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<a href=tools_work.php#cmdline>create_work</a>,
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then use the daemon program
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<a href=tools_work.php#make_work>make_work</a>
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to copy this workunit as needed to maintain a given supply of work.
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<h3>Transitioning</h3>
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<p>
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This program (which is supplied by BOINC and is application independent)
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handles various state transitions of workunits and results,
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such as timeouts.
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It generates initial results for workunits,
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and generates more results when timeouts or errors occur.
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<h3>Validation</h3>
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<p>
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There is one validator per application.
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It compares redundant results and selects a <b>canonical result</b>
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representing the correct output,
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and a <b>canonical credit</b> granted to users and hosts
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that return the correct output.
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<h3>Assimilation</h3>
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There is one assimilator per application.
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It handles workunits that are 'completed':
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that is, that have a canonical result or for which
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an error condition has occurred.
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Handling a successfully completed result might involve
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record results in a database and perhaps generating more work.
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<h3>File deletion</h3>
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This application-independent program
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deletes input and output files
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when they are no longer needed.
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";
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page_tail();
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?>
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