From: <rivin_at_euclid.math.temple.edu>

Date: Thu 01 Jul 2004 - 06:25:53 EST

R-help@stat.math.ethz.ch mailing list

https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Thu Jul 01 06:31:41 2004

Date: Thu 01 Jul 2004 - 06:25:53 EST

> <rivin@euclid.math.temple.edu> writes:

*>
**>> I did not use R ten years ago, but "reasonable" RAM amounts have
**>> multiplied by roughly a factor of 10 (from 128Mb to 1Gb), CPU speeds
**>> have gone up by a factor of 30 (from 90Mhz to 3Ghz), and disk space
**>> availabilty has gone up probably by a factor of 10. So, unless the I/O
**>> performance scales nonlinearly with size (a bit strange but not
**>> inconsistent with my R experiments), I would think that things should
**>> have gotten faster (by the wall clock, not slower). Of course, it is
**>> possible that the other components of the R system have been worked on
**>> more -- I am not equipped to comment...
**>
**> I think your RAM calculation is a bit off. in late 1993, 4MB systems
**> were the standard PC, with 16 or 32 MB on high-end workstations.
*

I beg to differ. In 1989, Mac II came standard with 8MB, NeXT came standard with 16MB. By 1994, 16MB was pretty much standard on good quality (= Pentium, of which the 90Mhz was the first example) PCs, with 32Mb pretty common (though I suspect that most R/S-Plus users were on SUNs, which were somewhat more plushly equipped).

> Comparable figures today are probably 256MB for the entry-level PC and

*> a couple GB in the high end. So that's more like a factor of 64. On the
**> other hand, CPU's have changed by more than the clock speed; in
**> particular, the number of clock cycles per FP calculation has
**> decreased considerably and is currently less than one in some
**> circumstances.
**>
*

I think that FP performance has increased more than integer performance,
which has pretty much kept pace with the clock speed. The compilers have
also improved a bit...

Igor

R-help@stat.math.ethz.ch mailing list

https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Thu Jul 01 06:31:41 2004

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