2004-06-09 19:09:16 +00:00
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<?php
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2003-11-02 23:08:06 +00:00
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require_once("docutil.php");
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page_head("BOINC network communication overview");
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echo"
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<p>
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The BOINC core client communicates with several servers
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in the course of getting work and returning results.
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All communication uses HTTP on port 80,
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so client can function through firewalls and proxies.
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<img src=comm.png>
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<ul>
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<li>
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The client downloads the page from project's
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2004-02-10 07:04:27 +00:00
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<a href=server_components.php>master URL</a>.
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2003-11-02 23:08:06 +00:00
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From XML tags embedded in this page,
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it obtains a list of domain names of <b>schedulers</b>.
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<li>
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The client exchanges
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<a href=protocol.php>request and reply messages</a>
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with a scheduling server.
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The reply message contains, among other things,
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descriptions of work to be performed,
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and lists of URLs of the input and output files of that work.
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<li>
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The client downloads files (application programs and data files)
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from one or more <b>download data servers</b>.
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This uses standard HTTP GET requests, perhaps with <code>Range</code> commands
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to resume incomplete transfers.
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<li>
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After the computation is complete,
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the client uploads the result files.
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This uses a <a href=upload.php>BOINC-specific protocol</a>
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that protects against DOS attacks on data servers.
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<li>
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The client then contacts a scheduling server again,
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reporting the completed work and requesting more work.
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</ul>
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";
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page_tail();
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?>
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