[Chicken-users] Parallel map
Hi,
I'm trying to implement a simple parallel map.
(I'm aware about the MPI egg, it actually works fine for me, but I'd
like to have something more lightweight. I managed to write a
parallel map with the hardwood egg, but since it uses green threads it
is not convenient for my use cases. I had a look to past discussions
[1, 2] where POSIX threads were recommended, but I am not familiar
with them and I didn't manage to get the code snippets working.)
[1]
https://lists.nongnu.org/archive/html/chicken-users/2010-12/msg00213.html
[2]
https://lists.nongnu.org/archive/html/chicken-users/2016-12/msg00017.html
So, I tried to use openmp. I list a code example at the bottom of the
email. Compilation `csc -L -fopenmp test.scm` is ok and openmp seems
linked correctly, I can call functions defined in :
(omp_get_max_threads) ; 8
But _OPENMP is not enabled:
(is_omp_enabled) ; #f
The openmp pragma directives do not complain during compilation, but
only 1 thread is used in the parallel loop:
(import srfi-1)
(let* ((input (list->f64vector (iota 10)))
(size (f64vector-length input))
(output (make-f64vector size)))
(squaremap size input output)
output) ; prints nthreads: 1
Do CHICKEN green threads also limit the number of threads from code
called through the C FFI? If not, do you have suggestions about how to
proceed to enable openmp to use several threads?
(I checked that if I ran the C code directly with GCC then _OPENMP is
defined and several threads are used.)
Best,
Francesco
(import (chicken foreign) srfi-4)
#>
#include
#include
bool is_omp_enabled()
{
bool omp = false;
#ifdef _OPENMP
omp = true;
#endif
return omp;
}
void squaremap(int n, double *a, double *b)
{
int i;
#pragma omp parallel for
for (i=0; ihttps://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Gnuplot pipe
Hi Mario, On 2/6/19 7:46 PM, Mario Domenech Goulart wrote: Thanks a lot. Your egg has been added to the coop. Thanks! I also added tests. However, if they fail because gnuplot is not installed maybe I should just rename tests/run.scm? I'd say it's ok to assume that gnuplot is installed, as it is a basic requirement for the egg to work at all, right? Yes that's right. I was thinking to automatic tests on CHICKEN infrastructure, but I see that it finds gnuplot. Best, Francesco ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Gnuplot pipe
Hi, On 1/21/19 7:08 AM, Mario Domenech Goulart wrote: If you have a chance, please consider porting it to CHICKEN 5 too. I ported the egg to CHICKEN 5 and added a new release file: https://gitlab.com/montanari/gnuplot-pipe/raw/master/gnuplot-pipe.c5.release-info I also added tests. However, if they fail because gnuplot is not installed maybe I should just rename tests/run.scm? Best, Francesco ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Gnuplot pipe
Hi Andy, On 1/20/19 10:23 PM, Andy Bennett wrote: This is great! I installed it and worked through the examples in the README. I've been thinking for a while about how I might easily draw charts with CHICKEN and this seems to be it. Great! It would be nice to have a more complete plotting interface rather than passing strings to the Gnuplot pipe with gp:send that already requires acquaintance with Gnuplot. But at least it seems to be decently flexible. When working through the examples, I got this error after trying `(gp:send "set terminal wxt nopersist")`. I have Debian Jessie's (8.11) gnuplot (4.6.6-2+deb8u1). - gnuplot> set terminal wxt nopersist ^ line 0: unknown or ambiguous terminal type; type just 'set terminal' for a list - Thanks! I'll change wxt to x11 that presumably should work with more people, and clarify that the idea is to use any of the interactive screen displays like qt, wxt, x11. Best, Francesco ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Gnuplot pipe
Hi Mario, On 1/21/19 7:08 AM, Mario Domenech Goulart wrote: Thanks a lot. Your egg has been added to the coop. Thanks! If you have a chance, please consider porting it to CHICKEN 5 too. Yes, I'll add wiki documentation and also port it to CHICKEN 5 asap. Best, Francesco ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
[Chicken-users] Gnuplot pipe
Hi, I put together a simple interface to Gnuplot, basically popen() with a couple of procedures to plot lists. The motivation is mainly to draw exploratory plots from the interpreter. If you think this may be useful as an egg I'm happy to add wiki documentation. Comments welcome. https://gitlab.com/montanari/gnuplot-pipe (Note that for those who have octave installed, the octave egg already provides a gnuplot interface.) Best, Francesco ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
