Please discuss with REvolution support. Most of us do not have a version
of REvolution R.
Uwe Ligges
Jason Liao wrote:
It runs more than twice as slowly using 8 core than using a single core
in inverting large matrix. Tested on 8 core Windows XP 64 machine.
n = 1000
n.simu = 100
func1 = function()
+ {
+ x = rnorm(n*n)
+ dim(x)=c(n,n)
+ y = solve(x)
+ }
setMKLthreads(1)
system.time(for(i in 1:n.simu) func1())
user system elapsed
69.48 2.42 71.91
setMKLthreads(8)
system.time(for(i in 1:n.simu) func1())
user system elapsed
179.06 17.90 41.70
Jason Liao
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and provide commented, minimal, self-contained, reproducible code.
