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@@ -394,6 +394,19 @@ there is some hidden parameter such as the number of iterations, etc.
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The example in the directory <c>examples/pi</c> uses this to include
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the number of iterations in the base.
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+StarPU will automatically determine when the performance model is calibrated,
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+or rather, it will assume the performance model is calibrated until the
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+application submits a task for which the performance can not be predicted. For
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+::STARPU_HISTORY_BASED, StarPU will require 10 (::_STARPU_CALIBRATION_MINIMUM)
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+measurements for a given size before estimating that an average can be taken as
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+estimation for further executions with the same size. For
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+::STARPU_REGRESSION_BASED and ::STARPU_NL_REGRESSION_BASED, StarPU will require
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+10 (::_STARPU_CALIBRATION_MINIMUM) measurements, and that the minimum measured
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+data size is smaller than 90% of the maximum measured data size (i.e. the
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+measurement interval is large enough for a regression to have a meaning).
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+Calibration can also be forced by setting the \ref STARPU_CALIBRATE environment
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+variable to <c>1</c>, or even reset by setting it to <c>2</c>.
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+
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How to use schedulers which can benefit from such performance model is explained
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in \ref TaskSchedulingPolicy.
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