getting faster results
It can depend on a whole list of things why the computations were taking so long, and just saying what methods you are using to do the computation is far from sufficient, as there are efficient ways and inefficient ways to do any computations, and we don't know how you did any of them. With the little information you gave, you cannot honestly expect much help. All anyone can give you is generic advise. Mine is as follows:\ - R has profiling facility that tells you what part(s) of the computation is taking the most time. Use it. (See ?Rprof.) - If you see (or hear) lots of disk activity, but fairly low CPU usage, you might be short in physical memory, and R is using virtual memory, which will be _very_ slow. - Given the same hardware, there's little difference in performance between different OSes, although Linux seems to have an edge. Compilers used can also make a difference. - Hardware can make a large difference. On some analyses I did, running the same code on an Opteron box running 64-bit Linux (SLES) was over six times faster than on my Pentium M laptop. Andy From: Elizabeth Lawson
I am running algorithms for Bayesian hierarchical models with
20 or more variables or writing alogrithms that solve for
partially linear models using wavlelet estimation. Soemtimes
just creating the predicted vaules from the Bayesian analysis
takes over a day to run!
I am just wondering if R runs faster on any particular
systems or if it is about the same regardless.
jim holtman <jholtman at gmail.com> wrote:
Need to know what you are trying to do with the data.
Depending on what you want to do and how you do it will
determine the speed. I can take a dataframe with 1,000,000
rows of transaction data and compute the average and plot a
histogram of the response time in less that a couple of
seconds. Is that fast enough?
On 12/13/05, Elizabeth Lawson <lizzylaws at yahoo.com> wrote: Hey,
Can anyone answer this question. I am working with really
large datasets and most of the programs I have been running
take quite some time.
I heard that R may be faster in Unix. I sthis true and if so
can anyone reccomend which system and requirements may allow
things to go faster for?
Thanks!!
Elizabeth Lawson
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