[R] R performance on Unix

[Paul Gilbert]

morozov wrote:

>Hi
>I'm observing a huge difference in the performance speed of R on Windows and 
>Unix, even though I know that my Unix machine is much more powerful than my 
>Win machine. 
>
I've had this experience on a Unix machine that I thought was much more 
powerful than my Windows machine. On closer examination it seems the 
hardware was better at multitasking, but definitely not faster on single 
processes, so you might want to be careful about the part you think you 
know. I haven't had this experience running Windows and Linux on the 
same machine, but even then there are an enormous number of variable in 
the way you build R.

Paul Gilbert

>In particular, any character processing task is very time consuming on Unix.
>
>strptime(x,"%H:%M:%S") is about 10 times slower on Unix for vector x of the 
>length of ~ 500. read.table() also is very slow. is there any way to speed up 
>these ?
>
>Thanks a lot,
>Vlad.
>
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