hardware - Why is R slower on my (stronger) Desktop than on my (weaker) laptop? -


i'm using dell latitude e7440 laptop windows 7 enterprise os, 8gb ram, 64-bit os, intel(r) core(tm) i7-4600u cpu @ 2.10ghz processor, 2701 mhz, 2 cores, 4 logical processors (that's 4 cores).

i'm using dell precision tower 7810 desktop windows 7 enterprise os, 32gb ram, 64-bit os, intel(r) xeon(r) cpu e5-2620 v3 @ 2.40ghz 2 processors, 2401 mhz, 6 cores, 12 logical processors (that's 24 cores).

a demonstration of use of r running binary classification using gbm in rstudio on 100k-sized data ~300 features. whatever on laptop r version (all other software closed, no use of parallelization), considerably faster on desktop r version. how can be? need find out?

laptop:

> sum <- 0; system.time(for (i in 1:1000000) sum <- sum + i)    user  system elapsed     0.36    0.00    0.36  > memory.limit() [1] 8097 > sessioninfo() r version 3.3.1 (2016-06-21) platform: x86_64-w64-mingw32/x64 (64-bit) running under: windows 7 x64 (build 7601) service pack 1  locale: [1] lc_collate=english_united states.1252  lc_ctype=english_united states.1252    lc_monetary=english_united states.1252 [4] lc_numeric=c                           lc_time=english_united states.1252      attached base packages: [1] stats     graphics  grdevices utils     datasets  methods   base       loaded via namespace (and not attached): [1] tools_3.3.1

desktop:

> sum <- 0; system.time(for (i in 1:1000000) sum <- sum + i)    user  system elapsed     0.52    0.00    0.52  > memory.limit() [1] 32684 > sessioninfo() r version 3.3.1 (2016-06-21) platform: x86_64-w64-mingw32/x64 (64-bit) running under: windows 7 x64 (build 7601) service pack 1  locale: [1] lc_collate=english_united states.1252  lc_ctype=english_united states.1252    lc_monetary=english_united states.1252 [4] lc_numeric=c                           lc_time=english_united states.1252      attached base packages: [1] stats     graphics  grdevices utils     datasets  methods   base       loaded via namespace (and not attached): [1] tools_3.3.1

dell latitude e7440 laptop ... i7-4600u cpu @ 2.10ghz processor, 2701 mhz

dell precision tower 7810 desktop ... e5-2620 v3 @ 2.40ghz 2 processors, 2401 mhz

that why. laptop's cpu running @ faster physical clock speed desktop, hence r runs faster.

in absence of multithreaded blas or other parallel-processing tricks, having multiple cores won't affect matters. similarly, long have enough memory hold data, more gigabytes won't speed things (excepting caching issues 100k should fit cache on both machines).


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