I did the same test on a MBP 15 i7 2.66GHz. The results follows. This is for
x86_64 version, the i386 version (aka R32) is slightly slower than this.
> set.seed(1)
> A <- matrix(rnorm(2000*2000),2000,2000)
> system.time(B <- crossprod(A))
user system elapsed
1.983 0.029 0.628
> system.time(B <- crossprod(A))
user system elapsed
1.988 0.023 0.595
> system.time(solve(B))
user system elapsed
5.980 0.183 2.366
> system.time(solve(B))
user system elapsed
5.781 0.155 1.982
> system.time({a <- rep(1.0,100); for(i in 1:1e6) a <- 1.0*a+0.0})
user system elapsed
2.269 0.919 3.160
> system.time({a <- rep(1.0,100); for(i in 1:1e6) a <- 1.0*a+0.0})
user system elapsed
2.207 0.846 3.029
> sessionInfo()
R version 2.11.0 Patched (2010-04-28 r51858)
x86_64-apple-darwin9.8.0
On 8 May 2010, at 19:53, Gardar Johannesson wrote:
> I was just replacing a Macbook Pro from 2008 (with a 2.2GHz Intel Core 2 Duo)
> with a new Macbook Pro (with a 2.4GHz Intel Core i5). To get a rough idea
> about the difference in R execution speed I ran a small test, with the output
> shown below. In short:
>
> 1) The new Macbook Pro was ca 60% _slower_ at linear algebra (crossprod() and
> solve())
> 2) The new Macbook Pro was ca 17% faster on a long for-loop
> 3) Linking against Goto2 versus vecLib improved the linear algebra results
> slightly
>
> Both test were done using the same 2.11.0 dmg image from CRAN.
>
> Any thoughts on this?
>
> Any ideas how I can improve the performance results? What about compiling
> from source?
>
>
> Thanks,
> Gardar Johannesson
>
>
> ###########################################
> ## Results from new macbook pro (Core i5 @ 2.4Ghz)
>
>> set.seed(1)
>> A <- matrix(rnorm(2000*2000),2000,2000)
>> system.time(B <- crossprod(A))
> user system elapsed
> 2.500 0.058 0.816
>> system.time(B <- crossprod(A))
> user system elapsed
> 2.502 0.050 0.814
>> system.time(solve(B))
> user system elapsed
> 7.208 0.265 2.740
>> system.time(solve(B))
> user system elapsed
> 7.121 0.264 2.666
>> system.time({a <- rep(1.0,100); for(i in 1:1e6) a <- 1.0*a+0.0})
> user system elapsed
> 2.964 0.602 3.528
>> system.time({a <- rep(1.0,100); for(i in 1:1e6) a <- 1.0*a+0.0})
> user system elapsed
> 3.040 0.732 3.732
>> sessionInfo()
> R version 2.11.0 (2010-04-22)
> i386-apple-darwin9.8.0
>
> locale:
> [1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
>
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
>
> loaded via a namespace (and not attached):
> [1] tools_2.11.0
>>
>
> ###################################################
> ## Results from old macbook pro (Core 2 Duo @ 2.2GHz)
>
>> set.seed(1)
>> A <- matrix(rnorm(2000*2000),2000,2000)
>> system.time(B <- crossprod(A))
> user system elapsed
> 1.429 0.073 0.800
>> system.time(B <- crossprod(A))
> user system elapsed
> 1.429 0.064 0.874
>> system.time(solve(B))
> user system elapsed
> 4.532 0.285 2.860
>> system.time(solve(B))
> user system elapsed
> 4.521 0.281 2.834
>> system.time({a <- rep(1.0,100); for(i in 1:1e6) a <- 1.0*a+0.0})
> user system elapsed
> 3.501 0.764 4.215
>> system.time({a <- rep(1.0,100); for(i in 1:1e6) a <- 1.0*a+0.0})
> user system elapsed
> 3.459 0.702 4.113
>> sessionInfo()
> R version 2.11.0 (2010-04-22)
> i386-apple-darwin9.8.0
>
> locale:
> [1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
>
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
>>
>
>
> ###################################################
> ## Results from new macbook pro (Core i5 @ 2.4Ghz)
> ## Linking against Goto2 BLAS (vs vecLib)
>
>> set.seed(1)
>> A <- matrix(rnorm(2000*2000),2000,2000)
>> system.time(B <- crossprod(A))
> user system elapsed
> 2.348 0.124 0.635
>> system.time(B <- crossprod(A))
> user system elapsed
> 2.342 0.110 0.622
>> system.time(solve(B))
> user system elapsed
> 6.634 0.327 2.158
>> system.time(solve(B))
> user system elapsed
> 6.697 0.348 2.034
>> system.time({a <- rep(1.0,100); for(i in 1:1e6) a <- 1.0*a+0.0})
> user system elapsed
> 2.577 0.548 2.885
>> system.time({a <- rep(1.0,100); for(i in 1:1e6) a <- 1.0*a+0.0})
> user system elapsed
> 2.411 0.478 2.859
>> sessionInfo()
> R version 2.11.0 (2010-04-22)
> i386-apple-darwin9.8.0
>
> locale:
> [1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
>
> _______________________________________________
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> R-SIG-Mac@stat.math.ethz.ch
> https://stat.ethz.ch/mailman/listinfo/r-sig-mac
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