mirror of https://github.com/BOINC/boinc.git
36 lines
1.1 KiB
HTML
36 lines
1.1 KiB
HTML
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<h2>Compute model: files</h2>
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<p>
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<b>Files</b> are inputs and outputs to applications,
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and the executable application programs.
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Each file has a <b>name</b> that is unique within the project.
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A file may also have one or more URLs,
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indicating where it is (or will be) located on data servers.
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Once a file is created (on the project server or on a participant host)
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it is immutable.
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<p>
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Files have the following Boolean attributes:
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<ul>
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<li> Sticky
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<li> Upload-when-present
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</ul>
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Some files originate on hosts;
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i.e. as output files of applications.
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If the Upload-when-present flag is set,
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the file (when available) is uploaded to one of its URLs.
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If the Sticky flag is set, the file remains on the host
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(where, e.g., it will serve as input to a later computation).
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<p>
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Other files originate in the back-end servers,
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and are placed on data servers.
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If the Sticky flag is set,
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the file is retained and a participant host after it is used.
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<p>
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The core agent and scheduling server exchange descriptions of files.
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These descriptions include an MD5 checksum of the file,
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providing protection against corruption and spoofing.
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