This is clearly a problem occuring in the C code of the ff package.
Please report to the package maintainer, Cced here (with the 'at a
minimum' information requested in the posting guide, most importantly
the Linux architecture and the versions involved).
FWIW it works for me on
sessionInfo()
R version 2.12.1 (2010-12-16)
Platform: x86_64-unknown-linux-gnu (64-bit)
...
other attached packages:
[1] ff_2.2-1 bit_1.1-6
If possible, try running this under valgrind (see 'Writing R
Extensions') to get more info on the cause: at least run under gdb to
get more precise info on what was not mapped.
You don't say what the host OS of VirtualBox was. We've found I/O
under VirtualBox with a x86_64 Linux host to be slow, but R to run
reliably.
On Wed, 2 Feb 2011, Wonsang You wrote:
Dear R Helpers,
I would like to report on an error in the ff package here.
The ff package is an R package which enables us to store large data on disk
systematically and have fast access to the database.
I used the package in Linux as a guest OS of VirtualBox, and executed the
following commands.
library(ff)
x<-ff(1:5,length=5,update=TRUE,vmode="double",filename="header.ff",
overwrite=TRUE)
Afterwards, I got the following error message.
*** caught segfault ***
address 0xffffffff, cause 'memory not mapped'
Traceback:
1: .Call("get_vector", .ffmode[vmode], attr(x, "physical"), index,
nreturn, PACKAGE = "ff")
2: `[.ff`(ret, 1)
3: ret[1]
4: as.vector(ret[1])
5: identical(as.vector(initdata[1]), as.vector(ret[1]))
6: ff(1:5, length = 5, update = TRUE, vmode = "double", filename =
"header.ff", overwrite = TRUE)
Possible actions:
1: abort (with core dump, if enabled)
2: normal R exit
3: exit R without saving workspace
4: exit R saving workspace
Selection:
Can anyone give an advice to solve the problem?
Best Regards,
Ryan
-----
Wonsang You
Leibniz Institute for Neurobiology
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--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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