Re: [R] My surprising experience in trying out REvolution's R

2009-04-24 Thread David M Smith
- > From: David M Smith [mailto:da...@revolution-computing.com] > Sent: Thursday, April 23, 2009 6:05 PM > To: Jason Liao > Cc: r-help@r-project.org > Subject: Re: [R] My surprising experience in trying out REvolution's R > > We've taken a look at this in a bit more detail;

Re: [R] My surprising experience in trying out REvolution's R

2009-04-24 Thread Jason Liao
. Jason -Original Message- From: David M Smith [mailto:da...@revolution-computing.com] Sent: Thursday, April 23, 2009 6:05 PM To: Jason Liao Cc: r-help@r-project.org Subject: Re: [R] My surprising experience in trying out REvolution's R We've taken a look at this in a bit more deta

Re: [R] My surprising experience in trying out REvolution's R

2009-04-23 Thread David M Smith
We've taken a look at this in a bit more detail; it's a very interesting example. Although the code uses several functions that exploit the parallel processing in REvolution R (notably %*% and chol), this was one of those situations where the overheads of threading pretty much balanced any perform

Re: [R] My surprising experience in trying out REvolution's R

2009-04-22 Thread Carl Witthoft
> First, the regular R 1.9. It takes 2 minutes and 6 seconds, CPU usage > 50% > > Next, REvolution's R. It takes 2 minutes and 10 seconds, CPU usage 100%. > > In other words, REvolution's R consumes double the CPU with slightly > less speed. The fact that it is the same time with only the 50%/10

Re: [R] My surprising experience in trying out REvolution's R

2009-04-21 Thread Dieter Menne
Jason Liao hes.hmc.psu.edu> writes: > I care a lot about R's speed. So I decided to give REvolution's R > (http://revolution-computing.com/) a try, which bills itself as an > optimized R. Note that I used the free version. > > My machine is a Intel core 2 duo under Windows XP professional. The c

Re: [R] My surprising experience in trying out REvolution's R

2009-04-21 Thread David M Smith
That's our guess too. We're running some tests now on the code to see what's going on, and it's entirely possible the performance gains are a function of the problem size, so we're testing that too. Changes in R between 2.7.2 (upon which REvolution R is currently based) and 2.9.0 are also a confou

Re: [R] My surprising experience in trying out REvolution's R

2009-04-21 Thread Bert Gunter
Sent: Tuesday, April 21, 2009 7:26 AM To: r-help@r-project.org Subject: [R] My surprising experience in trying out REvolution's R I care a lot about R's speed. So I decided to give REvolution's R (http://revolution-computing.com/) a try, which bills itself as an optimized R. Note

[R] My surprising experience in trying out REvolution's R

2009-04-21 Thread Jason Liao
I care a lot about R's speed. So I decided to give REvolution's R (http://revolution-computing.com/) a try, which bills itself as an optimized R. Note that I used the free version. My machine is a Intel core 2 duo under Windows XP professional. The code I run is in the end of this post. First,