Displaying 6 results from an estimated 6 matches for "blas_set_num_thread".
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blas_set_num_threads
2016 Aug 04
1
R, OpenBLAS and OMP_NUM_THREADS
...this by creating a small binary wrapper for the rsession binary
> | which sets the environment, but it would make a mess of the packaging.
> |
> | So I've gone with an `/etc/R/Rprofile.site` containing
> |
> | local({
> | if (require("RhpcBLASctl", quietly=TRUE)) blas_set_num_threads(1)
> | })
> |
> | which does mean people get this library loaded in all their sessions but
> | that doesn't seem to cause any particular trouble (yet).
In this case, hook of the / etc / R / Rprofile.site would be best
local({
if(require("RhpcBLASctl", quietly=TRUE)){...
2016 Aug 03
2
R, OpenBLAS and OMP_NUM_THREADS
...ld probably be possible to work
round this by creating a small binary wrapper for the rsession binary
which sets the environment, but it would make a mess of the packaging.
So I've gone with an `/etc/R/Rprofile.site` containing
local({
if (require("RhpcBLASctl", quietly=TRUE)) blas_set_num_threads(1)
})
which does mean people get this library loaded in all their sessions but
that doesn't seem to cause any particular trouble (yet).
Gordon
[1]: docs.rstudio.com/ide/server-pro/r-sessions.html
>
> 2016-08-01 20:06 GMT+09:00 Gordon Ball <gordon at chronitis.net>:
>>...
2019 Nov 19
2
Why is matrix product slower when matrix has very small values?
...the question on Stackoverflow:
https://stackoverflow.com/questions/58886111/r-why-is-matrix-product-slower-when-matrix-has-very-small-values
Somebody could reproduce the behavior but I did not get any useful
explanations yet.
Many thanks for hints!
Florian
## disable openMP
library(RhpcBLASctl); blas_set_num_threads(1); omp_set_num_threads(1)
A <- exp(-as.matrix(dist(expand.grid(1:60, 1:60))))
summary(c(A))
# Min. 1st Qu. Median Mean 3rd Qu. Max.
# 0.000000 0.000000 0.000000 0.001738 0.000000 1.000000
B <- exp(-as.matrix(dist(expand.grid(1:60, 1:60)))*10)
summary(c(B))
# Min. 1s...
2016 Aug 03
0
R, OpenBLAS and OMP_NUM_THREADS
...be possible to work
| round this by creating a small binary wrapper for the rsession binary
| which sets the environment, but it would make a mess of the packaging.
|
| So I've gone with an `/etc/R/Rprofile.site` containing
|
| local({
| if (require("RhpcBLASctl", quietly=TRUE)) blas_set_num_threads(1)
| })
|
| which does mean people get this library loaded in all their sessions but
| that doesn't seem to cause any particular trouble (yet).
I was just working on something that needed environment variables (for
automating tests to a database backend) and populating
/etc/R/Renviron.si...
2019 Nov 20
0
Why is matrix product slower when matrix has very small values?
...//stackoverflow.com/questions/58886111/r-why-is-matrix-product-slower-when-matrix-has-very-small-values
> Somebody could reproduce the behavior but I did not get any useful
> explanations yet.
>
> Many thanks for hints!
> Florian
>
> ## disable openMP
> library(RhpcBLASctl); blas_set_num_threads(1); omp_set_num_threads(1)
>
> A <- exp(-as.matrix(dist(expand.grid(1:60, 1:60))))
> summary(c(A))
> # Min. 1st Qu. Median Mean 3rd Qu. Max.
> # 0.000000 0.000000 0.000000 0.001738 0.000000 1.000000
>
> B <- exp(-as.matrix(dist(expand.grid(1:60, 1:60)))*1...
2016 Aug 01
2
R, OpenBLAS and OMP_NUM_THREEADS
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
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