OpenBLAS/benchmark/scripts/R/deig.R

#!/usr/bin/Rscript

argv <- commandArgs(trailingOnly = TRUE)

nfrom = 128
nto = 2048
nstep = 128
loops = 1

if ( length(argv) > 0 ) {

	for ( z in 1:length(argv) ) {

		if ( z == 1 ) {
			nfrom <- as.numeric(argv[z])
		} else if ( z==2 ) {
			nto <- as.numeric(argv[z])
		} else if ( z==3 ) {
			nstep <- as.numeric(argv[z])
		} else if ( z==4 ) {
			loops <- as.numeric(argv[z])
		}
	}

}

p=Sys.getenv("OPENBLAS_LOOPS")
if ( p != "" ) {
	loops <- as.numeric(p)
}	


cat(sprintf("From %.0f To %.0f Step=%.0f Loops=%.0f\n",nfrom, nto, nstep, loops))
cat(sprintf("      SIZE             Flops                   Time\n"))

n = nfrom
while ( n <= nto ) {

	A <- matrix(runif(n*n), ncol = n, nrow = n, byrow = TRUE)
	
	l = 1

	start <- proc.time()[3]

	while ( l <= loops ) {

		ev <- eigen(A)
		l = l + 1
	}

	end <- proc.time()[3]
	timeg = end - start
	mflops = (26.66 *n*n*n ) * loops / ( timeg * 1.0e6 )

	st = sprintf("%.0fx%.0f :",n , n)
	cat(sprintf("%20s %10.2f MFlops %10.6f sec\n", st, mflops, timeg))

	n = n + nstep

}