mirror of https://github.com/BOINC/boinc.git
41 lines
1.2 KiB
HTML
41 lines
1.2 KiB
HTML
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<title>Computation credit</title>
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<body bgcolor=ffffff>
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<h2>Computation credit</h2>
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<p>
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Each project gives you <b>credit</b> for the computations your
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computers performs for the project.
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These credits are used to generate web-site "leaderboards" showing
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individuals, teams, and categories (countries, CPU types, etc.)
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ranked by credit.
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<p>
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BOINC's credit system is based on a unit of computation
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called a <b>Cobblestone</b>, defined as
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<ul>
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<li>1 billion floating-point multiply/adds
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<li>1 billion integer multiply/adds
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<li>4 billion bytes of traffic to and from main memory
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(sequential, half reads and half writes)
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</ul>
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<p>
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In principle, credit should reflect network transfer and disk storage as well
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as computation.
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But it's hard to verify these activities,
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so for now they aren't included.
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<p>
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Each project maintains two types of credit:
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<ul>
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<li> <b>Total credit</b>:
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The total number of Cobblestones performed.
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<li> <b>Recent average credit</b>:
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The average number of Cobblestones per second performed recently
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("recently" is defined by an exponential function
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that decays by a factor of e every week).
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</ul>
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<p>
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Both types of credit are maintained for both users and hosts.
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