Tag: measurement
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Calculating Conditional Entropy in R
conditionalEntropy <- function( graph ) { # graph is a 2 or 3 column dataframe if (ncol(graph) == 2 ) { names(graph) <- c(“from”,”to”) graph$weight <- 1 } else if (ncol(graph) == 3) names(graph) <- c(“from”,”to”,”weight”) max <- length(rle(paste(graph$from, graph$to))$values) …
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Load Volatility and Resource Planning for your Cloud
Having your own cloud does not mean you are out of the resource planning business, but it does make the job a lot easier. If you collect the right data, with the application of some well understood statistical practices, you can break the work down into two different tasks: supporting workload volatility and resource planning.…
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Measuring Load in the Cloud: Correcting for Seasonality
Usage is over threshold, unleash the kraken! Short run peaks are perfect for automated elasticity: the unpredictable consumption that we stay up late worrying about fulfilling. But, short run peaks can be difficult to tease out from expected variation within the period: seasonality. Using the open source statistical package R, we can separate and look…