Displaying 20 results from an estimated 5000 matches similar to: "Multicore package: sharing/modifying variable accross processes"
2009 Jun 02
2
bigmemory - extracting submatrix from big.matrix object
I am using the library(bigmemory) to handle large datasets, say 1 GB,
and facing following problems. Any hints from anybody can be helpful.
_Problem-1:
_
I am using "read.big.matrix" function to create a filebacked big matrix
of my data and get the following warning:
> x =
read.big.matrix("/home/utkarsh.s/data.csv",header=T,type="double",shared=T,backingfile
2010 Aug 11
1
Bigmemory: Error Running Example
Hi,
I am trying to run the bigmemory example provided on the
http://www.bigmemory.org/
The example runs on the "airline data" and generates summary of the csv
files:-
library(bigmemory)
library(biganalytics)
x <- read.big.matrix("2005.csv", type="integer", header=TRUE,
backingfile="airline.bin",
descriptorfile="airline.desc",
2010 Dec 17
1
[Fwd: adding more columns in big.matrix object of bigmemory package]
Hi,
With reference to the mail below, I have large datasets, coming from various
different sources, which I can read into filebacked big.matrix using library
bigmemory. I want to merge them all into one 'big.matrix' object. (Later, I
want to run regression using library 'biglm').
I am unsuccessfully trying to do this from quite some time now. Can you
please
2012 May 05
2
looking for adice on bigmemory framework with C++ and java interoperability
I work with problems that have rather large data requirements -- typically
a bunch of multigig arrays. Given how generous R is with using memory, the
only way for me to work with R has been to use bigmatrices from bigmemory
package. One thing that is missing a bit is interoperability of bigmatrices
with C++ and possibly java. What i mean by that is API that would allow
read and write filebacked
2011 Sep 29
1
efficient coding with foreach and bigmemory
I recently learned about the bigmemory and foreach packages and am trying
to use them to help me create a very large matrix. Without those
packages, I can create the type of matrix that I want with 10 columns and
5e6 rows. I would like to be able to scale up to 5e9 rows, or more, if
possible.
I have created a simplified example of what I'm trying to do, below. The
first part of the
2010 Mar 11
2
ANNOUNCE--Rdsm package, a threads-like environment for R
My long-promised Rdsm package is now on CRAN. Some of you may recall
that I made a prototype available on my own Web page last July. This is
the official version, much evolved since I released the prototype.
The CRAN description states:
Provides a threads-like programming environment for R, usable both on
a multicore machine and across a network of multiple machines. The
package
2011 Aug 17
1
R cmd check and multicore foreach loop
Hi,
in R 2.12.1, R CMD check hangs when building a vignette that uses a
foreach loop with the doMC parallel backend.
This does not happen in R 2.13.1, nor if I use doSEQ instead of doMC.
All versions of multicore, doMC and foreach are the same on both my R
installations.
Has anybody encountered a similar issue?
Thank you.
Renaud
###
UNIVERSITY OF CAPE TOWN
This e-mail is subject to the
2009 Feb 25
3
Using very large matrix
Dear friends,
I have to use a very large matrix. Something of the sort of
matrix(80000,80000,n) .... where n is something numeric of the sort 0.xxxxxx
I have not found a way of doing it. I keep getting the error
Error in matrix(nrow = 80000, ncol = 80000, 0.2) : too many elements specified
Any suggestions? I have searched the mailing list, but to no avail.
Best,
--
Corrado Topi
Global
2009 Sep 04
3
asking for suggestions: interface for a C++ class
Dear All,
I would like to have an advice for designing an R library, and thought
that R-devel may be the best place to ask given so many people who are
highly expert in R are around.
We are at an early stage of designing an R library, which is
effectively an interface to a C++ library providing fast access to
large matrices stored on HDD as binary files. The core of the C++
library is
2010 Jun 25
2
installing multicore package
Sir,
I want to apply mclapply() function for my analysis. So, I have to install
multicore package. But I can not install the package.
>install.packages("multicore")
It gives that package multicore is not available.
Can you help me?
Regards,
Suman Dhara
[[alternative HTML version deleted]]
2010 Apr 23
2
bigmemory package woes
I have pretty big data sizes, like matrices of .5 to 1.5GB so once i need to
juggle several of them i am in need of disk cache. I am trying to use
bigmemory package but getting problems that are hard to understand. I am
getting seg faults and machine just hanging. I work by the way on Red Hat
Linux, 64 bit R version 10.
Simplest problem is just saving matrices. When i do something like
2010 Aug 04
1
[LLVMdev] regarding multicore support for LLVM
It is so difficult ...
Which FE? It need BE support? I didn't get it.
2010/8/4 vijay kumar <vijaygbvv at gmail.com>
> Yeah OpenMP support. I read that it has a front end support but not the
> back end. So are there any projects or teams looking at this issue.
>
> On Wed, Aug 4, 2010 at 7:24 AM, Liu <proljc at gmail.com> wrote:
>
>> Multicore?
>> You
2009 Jul 20
2
kmeans.big.matrix
Hi,
I'm playing around with the 'bigmemory' package, and I have finally
managed to create some really big matrices. However, only now I
realize that there may not be functions made for what I want to do
with the matrices...
I would like to perform a cluster analysis based on a big.matrix.
Googling around I have found indications that a certain
kmeans.big.matrix() function should
2010 Aug 03
5
[LLVMdev] regarding multicore support for LLVM
Hi all,
I am new to this LLVM. I went through the documenation of LLVM but
I didn't find any support for Multicore. Is there any such possibility where
multicore architecture can be exploited using LLVM.
Thanks
Vijay
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2010 Aug 04
0
[LLVMdev] regarding multicore support for LLVM
On Aug 3, 2010, at 8:48 PM, Liu wrote:
> It is so difficult ...
> Which FE? It need BE support? I didn't get it.
>
> 2010/8/4 vijay kumar <vijaygbvv at gmail.com>
> Yeah OpenMP support. I read that it has a front end support but not the back end. So are there any projects or teams looking at this issue.
>
> On Wed, Aug 4, 2010 at 7:24 AM, Liu <proljc at
2008 Sep 22
1
Profiling on Multicore and Parallel Systems
Hello All,
In general when we use Rprof for performance evaluation on
Multicore systems the output provides the time on the basis of the "user"
time and the sampling time is equal to the the user time as reported by
system.time. This does not seem right behavior when R is linked to
BLAS/Lapack or other libraries which are optimized for parallel or multicore
architectures as
2008 Sep 22
1
Profiling on Multicore and Parallel Systems
Hello All,
In general when we use Rprof for performance evaluation on
Multicore systems the output provides the time on the basis of the "user"
time and the sampling time is equal to the the user time as reported by
system.time. This does not seem right behavior when R is linked to
BLAS/Lapack or other libraries which are optimized for parallel or multicore
architectures as
2019 Jul 19
1
difficulty with sanitizer using bigmemory
Dear all,
bigKRLS, which has been on CRAN for a couple of years, had to be pulled
recently due to what seems to be a sanitizer issue stemming from its use of
bigmemory. bigKRLS works fine (we?ve used it ourselves on many different
platforms and have had over 15,000 downloads without an end user reporting
difficulties because of this issue). Unfortunately, we have been unable to
reproduce the
2011 Feb 02
2
multicore + xeon ?
Is there any reason to expect a problem ?
i'm running this script on the cluster down the hall:
module load R/2.11.0
R
library(multicore)
fxx<-function(ll) runif(1)
mclapply(1:10,fxx)
i get:
Error in fork() : Unable to fork.
less /proc/cpuinfo
yields:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU
2011 Oct 16
1
multicore combn
This is a 'rather than re-invent the wheel' post. Has anyone out there
re-written combn so that it can be parallelized - with multicore, snow, or
otherwise? I have a job that requires large numbers of combinations, and
rather than get all of the index values, then crank it through mclapply, I
was wondering if there was a way to just do this natively within a function.
Just curious.