On Aug 27, 2011, at 3:37 PM, Simon Zehnder wrote:
Dear R users,
I am using R right now for a simulation of a model that needs a lot of
memory. Therefore I use the *bigmemory* package and - to make it
faster -
the *doMC* package. See my code posted on http://pastebin.com/dFRGdNrG
Now, if I use the foreach loop with the addon %do% (for sequential
run) I
have no problems at all - only here and there some singularities in
regressor matrices which should be ok.
BUT if I run the loop on multiple cores I get very often a bad
exception. I
have posted the exception on http://pastebin.com/eMWF4cu0 The
exception
comes from the NeweyWest function loaded within the sandwich library.
I have no clue, what it want to say me and why it is so weirdly
printed to
the terminal. I am used to receive here and there errors....but the
messages
never look like this.
Does anyone have a useful answer for me, where to look for the cause
of this
weird error?
Here some additional information:
Hardware: MacBook Pro 2.66 GHz Intel Core Duo, 4 GB Memory 1067 MHz
DDR3
Software System: Mac Os X Lion 10.7.1 (11B26)
Software App: R64 version 2.11.1 run via Mac terminal
Using the R64 version in a 4GB environment will reduce the effective
memory capacity since the larger pointers take up more space, and
using parallel methods is unlikely to improve performance very much
with only two cores. It also seems likely that there have been several
bug fixes in the last couple of years since that version of R was
released, so the package authors are unlikely to be very interested in
segfault errors thrown by outdated software.
I hope someone has a good suggestion!
Update R. Don't use features that only reduce performance and make
unstable a machine that has limited resources.
--
David Winsemius, MD
West Hartford, CT
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