Put some numbers on your request. How much slower was it? Did you
measure the user and system CPU? Was there a difference? Was there a
large amount of I/O or other system calls being done?
On Mon, May 24, 2010 at 2:01 PM, Peter Holt <source.code.de...@gmail.com> wrote:
> Hi Folks,
>
> I created a .R file with source code that accesses functions from a R
> package (example, fTrading).
>
> I then run the created application in two different configurations:
>
> 1. I started a R session, and then ran the application using the source
> ("my_application.R") command, and I measured the time the application ran.
>
> 2. I started 2 R sessions in the same processor, and executed the same
> source ("my_application.R") command, and measured the times the application
> ran.
>
> The times I measured for each applications in #2 was slower than the times I
> measured for the application in #1.
>
> The application was run in a 4-core machine running Linux.
>
> When the application ran, i used "mpstat" to look at the CPU usage. For #1,
> the CPU usage was 25%, and for #2, the CPU usage was 50%.
>
> No other process was running in the machine.
>
> My question is, why would #2 be slower than #1?
>
> Thanks,
> Peter
>
> [[alternative HTML version deleted]]
>
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>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
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