mirror of https://github.com/BOINC/boinc.git
91 lines
2.7 KiB
PHP
91 lines
2.7 KiB
PHP
<?php
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require_once("docutil.php");
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page_head("Daemon programs");
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echo "
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<p>
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A BOINC project includes of a set of daemons
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(programs that run all the time).
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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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They all have the command-line option:
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<pre>
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-d N
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</pre>
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Sets the verbosity level.
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1 = critical messages only,
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2 = normal messages,
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3 = detailed debugging info.
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<h3>Work generator</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 library functions</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>create_work</a>,
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then use the daemon program
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<a href=busy_work.php>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>Feeder</h3>
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<p>
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This program is supplied by BOINC and is application independent.
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It creates a shared-memory segment used to pass database records
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to CGI scheduler processes.
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It has the command-line option:
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<pre>
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-mod n i
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</pre>
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If present, this instance of the feeder will handle
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only workunits for which mod(id, n) = i.
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This lets you run schedulers on arbitrarily many machines.
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<h3>Transitioner</h3>
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<p>
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This program is supplied by BOINC and is application independent.
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It handles state transitions of workunits and results.
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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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It has the command-line option:
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<pre>
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-mod n i
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</pre>
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If present, this instance of the transitioner will handle
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only workunits for which mod(id, n) = i.
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This lets you run arbitrarily many instances of the transitioner.
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<h3>Validator</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>Assimilator</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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The application-independent program
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<a href=file_deleter.php>file_deleter</a>
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deletes input and output files when they are no longer needed.
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<h3>Database purging</h3>
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The application-independent program
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<a href=db_purge.php>db_purge</a>
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removes work-related database entries when they are no longer needed.
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This keeps your database at a constant size even
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when your project runs for a long time.
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";
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page_tail();
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?>
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