search for: omp_num_threads

...ngle (or at least, << NUM_CPUS) threaded operation? Using R 3.3.1 (both in debian unstable or using the CRAN repository for xenial) with OpenBLAS (0.2.18) defaults to using one thread per available CPU, which isn't ideal for machines more than a couple of CPUs. Setting the environment (OMP_NUM_THREADS or OPENBLAS_NUM_THREADS) in the shell works: $ OMP_NUM_THREADS=1 R > Sys.getenv("OMP_NUM_THREADS") [1] "1" > system.time({x <- replicate(5e3, rnorm(5e3)); tcrossprod(x) }) [runs in one thread] but adding it to /etc/R/Renviron.site doesn't: $ R > Sys.getenv(&qu...

On 02/08/16 03:10, Ei-ji Nakama wrote: > Hi, > > Create /etc/profile.d/openblas.sh. > Write the following during in this file. > OPENBLAS_NUM_THREADS = 1 > export OPENBLAS_NUM_THREADS > > OPENBLAS_NUM_THREADS environment variable does not affect the OMP_NUM_THREADS. > Thanks for the response. This works fine for R run from the command line (as does setting the same variable in `/etc/environment`), providing a fresh login is made. Unfortunately neither this nor anything else I've tried today appears to set the variable for sessions started through...

...a wrote: > | > Hi, > | > > | > Create /etc/profile.d/openblas.sh. > | > Write the following during in this file. > | > OPENBLAS_NUM_THREADS = 1 > | > export OPENBLAS_NUM_THREADS > | > > | > OPENBLAS_NUM_THREADS environment variable does not affect the OMP_NUM_THREADS. > > Thumbs up to using /etc/profile.d/ -- very nice hook. > > | Unfortunately neither this nor anything else I've tried today appears to > | set the variable for sessions started through RStudio server (which may > | or may not be an appropriate issue here). > | > | It...

Hi, Create /etc/profile.d/openblas.sh. Write the following during in this file. OPENBLAS_NUM_THREADS = 1 export OPENBLAS_NUM_THREADS OPENBLAS_NUM_THREADS environment variable does not affect the OMP_NUM_THREADS. 2016-08-01 20:06 GMT+09:00 Gordon Ball <gordon at chronitis.net>: > What is the correct way to globally configure R to default to single (or > at least, << NUM_CPUS) threaded operation? > > > Using R 3.3.1 (both in debian unstable or using the CRAN repository for >...

...rote: | On 02/08/16 03:10, Ei-ji Nakama wrote: | > Hi, | > | > Create /etc/profile.d/openblas.sh. | > Write the following during in this file. | > OPENBLAS_NUM_THREADS = 1 | > export OPENBLAS_NUM_THREADS | > | > OPENBLAS_NUM_THREADS environment variable does not affect the OMP_NUM_THREADS. Thumbs up to using /etc/profile.d/ -- very nice hook. | Unfortunately neither this nor anything else I've tried today appears to | set the variable for sessions started through RStudio server (which may | or may not be an appropriate issue here). | | It appears that the rstudio server spawn...

...tion(n){.C("hello_omp",as.integer(n))} hello_omp(3) hello_omp(2) Only 1 thread is been used, instead of 3 and 2: > hello_omp(3) Hello World from thread 0 There are 1 threads [[1]] [1] 3 > hello_omp(2) Hello World from thread 0 There are 1 threads [[1]] [1] 2 I also tried to set OMP_NUM_THREADS=3 in the Konsole with "export OMP_NUM_THREADS=3", in the .c file directory, but it seems that R don't recognize it when calls .C I am using R version 2.10.1 in Ubuntu 9.10 - Karmic Koala, but i'm newbie in Linux. Thanks a lot in advance for your help !* * [[alternative HTML ve...

...http://lampiao.lsc.ic.unicamp.br/%7Epiga/gsoc_2008/implementation.pdf>) the decoding time should be reduced in 33%, but it was just 10% for pthread an 5% for openMP. I used a video with 1440x1080. The pthread implementation has 3 threads and the OpenMP was executed with the environment variable OMP_NUM_THREADS=3. The results are: Real(s) User(s) System(s) Speed up(%) OpenMP 25.2 29.2 1.8 4 PThread 23.8 28.3 1.0 10 Current 26.2 26.0 0.3 0 I used an Intel(...

...*** address 0x7f092cc46e40, cause 'invalid permissions' Traceback: 1: La.svd(x, nu, nv) 2: svd(X) 3: ginv(bigmatrix) Here is the code that I run: require(MASS) l=30000 w=30000 x=rpois(l*w,0.00126) bigmatrix=matrix(x,nrow=l,ncol=w) inverted=ginv(bigmatrix) I have tried this both with OMP_NUM_THREADS=1 and greater than 1, and the resulting is always a segfault. The max memory used in around 40G. I am running this on a machine with 128Gb of RAM. I have also done tests with 15,000x15,000 matrices, and they do not cause any segfaults, so I think the problem is related to the size of the input to t...

Has anyone succeeded in getting a parallel BLAS, such as Goto's BLAS, installed on a machine running Ubuntu 11.10? I currently have the libatlas3gf-base package installed on a machine with an AMD Athlon X4 processor. I tried to install the libopenblas-base and libopenblas-dev packages but there seemed to be a glich related to having both libopenblas and libatlas3gf installed so that when I

Hi all, I have some C++ code that I call from my package. In my main C++ loop, I check for user interrupts and return to the R shell after ensuring I've deallocated memory appropriately. This works fine when the code is compiled with gcc+openmp and with icc without openmp, but when I compile with icc and use openmp, the entire R session is immediately terminated when I hit ctrl-C. This

----- Original Message ----- > From: "Timothy Mattausch Creech" <tcreech at umd.edu> > To: "Sebastian Dreßler" <dressler at zib.de> > Cc: "Aparna Kotha" <akotha at umd.edu>, llvmdev at cs.uiuc.edu > Sent: Sunday, March 3, 2013 11:32:49 AM > Subject: Re: [LLVMdev] AESOP autoparallelizing compiler > > Hi Sebastian, > Sure!

I got this to work on Linux but it is not working on Windows. *My understanding is that this should also work on windows, is that correct?* If so, what should I do? differently? To get it to work on Linux, I modified my R script as follows: #' OpenMP Hello World #' #' @param nthreads The number of threads that you want to use #' @example #' hello(nthreads=2) #' @export

Hi Sebastian, Sure! The bulk of LMDA was written by Aparna Kotha (CCd). It computes dependences between all instructions, computes the resulting direction vectors in the function, then associates them all with loops. At a high level, the dependence analysis consults with AliasAnalysis, and ScalarEvolution before resorting to attempting to understand the effective affine expressions and

Attached is the very verbose ssh output. Just to be perverse, this time two nodes lost connectivity. The only thing I see is lines saying that the two connections are lost, although being honest I have no idea what everything else means. For reference, 8 ssh cinnections were being made at the same time for a 8x8mpi task. N.B., since the OS I am using does not have rsh, I am currently using the

Dear R Core Team, I wish to report what can be viewed as a bug or at least a strange behavior in R-3.4.1. I ask my question here (as recommended on https://www.r-project.org/bugs.html) since I am not member of the R's Bugzilla. When running 'R --vanilla' from the command line, the standard matrix product is by default based on BLAS and multi-threaded on all cores available on

...; > Clause | MDString in Metadata > ------------------------------------------------------------ > if(scalar_expr) | OMP_IF > ------------------------------------------------------------ > num_threads(integer_expr) | OMP_NUM_THREADS > ------------------------------------------------------------ > final(scalar_expr) | OMP_FINAL > ------------------------------------------------------------ > collapse(const_integer_expr) | OMP_COLLAPSE > > Here is an example of OpenMP clause with a...

...ar or Integer Expressions Clause | MDString in Metadata ------------------------------------------------------------ if(scalar_expr) | OMP_IF ------------------------------------------------------------ num_threads(integer_expr) | OMP_NUM_THREADS ------------------------------------------------------------ final(scalar_expr) | OMP_FINAL ------------------------------------------------------------ collapse(const_integer_expr) | OMP_COLLAPSE Here is an example of OpenMP clause with a scalar expression and its re...

...> Clause | MDString in Metadata > ------------------------------------------------------------ > if(scalar_expr) | OMP_IF > ------------------------------------------------------------ > num_threads(integer_expr) | OMP_NUM_THREADS > ------------------------------------------------------------ > final(scalar_expr) | OMP_FINAL > ------------------------------------------------------------ > collapse(const_integer_expr) | OMP_COLLAPSE > > Here is an example of OpenMP clause with...

...> Clause | MDString in Metadata > ------------------------------------------------------------ > if(scalar_expr) | OMP_IF > ------------------------------------------------------------ > num_threads(integer_expr) | OMP_NUM_THREADS > ------------------------------------------------------------ > final(scalar_expr) | OMP_FINAL > ------------------------------------------------------------ > collapse(const_integer_expr) | OMP_COLLAPSE > > Here is an example of OpenMP clause with...

All, I'd like to resurrect the discussion on replacing libgomp with libiomp as the default OpenMP runtime library linked with -fopenmp. For reference, the previous discussion is accessible there: http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20140217/thread.html#99461 We are very close to getting *full* OpenMP 3.1 specification supported in clang (only one (!) clause is not