[R-sig-ME] Model specification help
elw at stderr.org
elw at stderr.org
Fri Mar 9 04:55:29 CET 2007
> Thank you for this. I will return to it tomorrow and let you know how it
> goes. As for the machine it's running on: it's a dual-Xeon 2.8Ghz IBM
> eseries server with 6GB RAM, running debian Linux, kernel 2.6.18. So
> the 3GB per-process memory limit applies. I also have access to a shared
> server with "twenty-four 1.05 GHz Ultra-Sparc III+ processors and 40 GB
> of main memory" running solaris, if that's better.
Andrew,
That gets you onto a 64-bit platform, beyond the 32-bit-Intel 4GB memory
(3G for user process, 1G for OS kernel) limit, and beyond a bunch of other
data size limits. The memory bandwidth available to you on the Solaris
machine is also likely to be much more significant - something that you
will find quite pleasant for even some more trivial analyses. :)
Much better, certainly! [And very much like what 'beefy' R code is most
frequently run on...]
W.r.t. the eSeries server you're commonly running on now - if you can have
your systems people check to make sure that you have a PAE-enabled linux
kernel running, you might be able to muscle past the 3GB mark with a
single R process.... with some work.
[If the machine can actually "see" all 6GB of memory, you probably have a
PAE kernel.]
--e
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