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#
# cpu-technologie.R, 25 Mar 16
#
# Data from:
#
# Andrew Danowitz and Kyle Kelley and James Mao and John P. Stevenson and Mark Horowitz
# CPU DB: Recording Microprocessor History
#
# Example from:
# Empirical Software Engineering using R
# Derek M. Jones
source("ESEUR_config.r")
cpu=read.csv(paste0(ESEUR_dir, "benchmark/cpu-technologie.csv.xz"), as.is=TRUE)
pal_col=rainbow(3)
# 0.54307nm is the lattice size for Silicon atoms.
# The lattice has a diamond cubic structure, so individuals atoms
# are closer to each other than this.
plot(jitter(cpu$year), cpu$feature_size*1000/0.54307, log="y", col=point_col,
xlim=c(1980, 2015),
xlab="Year", ylab="Feature size (in Silicon atoms)\n")