[R] Calculating CPU times for different RAM configuratio

Agustin Lobo alobo at ija.csic.es
Mon Jul 30 13:15:02 CEST 2001


I have an slow process in R because
I'm using an laply() with a long list.

The process is very slow now, but I'm
using a very old machine with only 64k of
RAM. I want to buy a new machine but
I would like to calculate, at least as 
an approximation, how long would
my process take for different RAM 
configurations, so that I can take 
a decision based on cost/speed information.

Could anyone tell me how I could estimate
the gain in CPU time for increasing RAM? I
understand that the key variable is the relative
size of the memory that has to be allocated vs.
the RAM: if all can be fit in RAM, then the process
will be very fast. Perhaps I should just calculate
the size of the memory that the process allocates?



Dr. Agustin Lobo
Instituto de Ciencias de la Tierra (CSIC)
Lluis Sole Sabaris s/n
08028 Barcelona SPAIN
tel 34 93409 5410
fax 34 93411 0012
alobo at ija.csic.es

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