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moran
2003 Nov 21
1
Using log() on an openMosix cluster
...de:
##
N <- 100000; a <- numeric(N); b <- numeric(N)
e <- rnorm(N)
for(i in 1:N) {
a[i] <- exp(e[i])
b[i] <- log(abs(a[i]))
}
##
When I run it on the head node, everything is fine. However, when I
send the R process off to one of the cluster nodes (i.e. using mosrun
from the head node) the program takes about 10 times longer (in
wall-clock time, cpu time is roughly the same).
Interestingly, when I tried running the following code:
##
N <- 100000; a <- numeric(N); b <- numeric(N)
e <- rnorm(N)
for(i in 1:N) {
a[i] <- exp(e[i])...