[R-sig-hpc] multicore 0.1-4 for Windows

[davidr at rhotrading.com]

I understand that the support for Windows is experimental,
so I thought I'd just try it out.
Maybe I don't understand some things.
Can someone explain what's going on here?
Is this as expected, and what am I doing wrong?
(I am on Windows XP SP2, and have 8 cores. SessionInfo below.)

> install.packages('multicore',,'http://www.rforge.net/')
trying URL
'http://www.rforge.net/bin/windows/contrib/2.9/multicore_0.1-4.zip'
Content type 'application/zip' length 90538 bytes (88 Kb)
opened URL
downloaded 88 Kb

package 'multicore' successfully unpacked and MD5 sums checked

The downloaded packages are in
        C:\Documents and Settings\davidr\Local
Settings\Temp\Rtmpv52Ozb\downloaded_packages
updating HTML package descriptions
> library(multicore)
> mclapply(1:10, sqrt, mc.cores=1)
[[1]]
[1] 1
[[2]]
[1] 1.414214
[[3]]
[1] 1.732051
[[4]]
[1] 2
[[5]]
[1] 2.236068
[[6]]
[1] 2.449490
[[7]]
[1] 2.645751
[[8]]
[1] 2.828427
[[9]]
[1] 3
[[10]]
[1] 3.162278

> mclapply(1:10, sqrt, mc.cores=2)
[[1]]
[1] 1
[[2]]
[1] 1.732051
[[3]]
[1] 2.236068
[[4]]
[1] 2.645751
[[5]]
[1] 3

> sessionInfo()
R version 2.9.1 (2009-06-26) 
i386-pc-mingw32 

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base


other attached packages:
[1] multicore_0.1-4

loaded via a namespace (and not attached):
[1] tools_2.9.1

Thanks for any insight,
David L. Reiner
Rho Trading Securities, LLC



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