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/* Multithreading test to detect scaling issues with MPFR. |
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|
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Define: |
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* the function F; |
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* the precision PREC; |
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* the value V as an expression that will have the type double |
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(it may depend on the thread number i). |
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|
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Example: |
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gcc threads.c -lmpfr -lgmp -lpthread -DF=mpfr_sin -DPREC=200 -DV=100 |
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|
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Copyright 2018-2020 Free Software Foundation, Inc. |
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Contributed by the AriC and Caramba projects, INRIA. |
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|
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This file is part of the GNU MPFR Library. |
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|
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The GNU MPFR Library is free software; you can redistribute it and/or modify |
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it under the terms of the GNU Lesser General Public License as published by |
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the Free Software Foundation; either version 3 of the License, or (at your |
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option) any later version. |
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|
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The GNU MPFR Library is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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License for more details. |
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|
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You should have received a copy of the GNU Lesser General Public License |
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along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see |
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https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., |
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <pthread.h> |
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|
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#include <mpfr.h> |
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|
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#define MAX_THREADS 256 |
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|
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static int m; |
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|
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static void *start_routine (void *arg) |
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{ |
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mpfr_t x, y; |
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int i = *(int *) arg, j; |
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|
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(void) i; /* avoid a warning if i is not used by V */ |
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|
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mpfr_inits2 (PREC, x, y, (mpfr_ptr) 0); |
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mpfr_set_d (x, (V), MPFR_RNDN); |
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|
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for (j = 0; j < m; j++) |
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F (y, x, MPFR_RNDN); |
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|
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mpfr_clears (x, y, (mpfr_ptr) 0); |
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pthread_exit (NULL); |
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} |
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|
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int main (int argc, char *argv[]) |
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{ |
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int i, n; |
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pthread_t tid[MAX_THREADS]; |
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|
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if (argc != 3 || |
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(m = atoi (argv[1]), m < 1) || |
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(n = atoi (argv[2]), n < 1 || n > MAX_THREADS)) |
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{ |
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fprintf (stderr, "Usage: %s <#iterations> <#threads>\n", argv[0]); |
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exit (1); |
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} |
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|
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printf ("%d iteration(s), %d thread(s).\n", m, n); |
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|
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for (i = 0; i < n; i++) |
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if (pthread_create (&tid[i], NULL, start_routine, &i) != 0) |
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{ |
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fprintf (stderr, "%s: failed to create thread %d\n", argv[0], i); |
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exit (1); |
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} |
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|
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for (i = 0; i < n; i++) |
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if (pthread_join (tid[i], NULL) != 0) |
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{ |
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fprintf (stderr, "%s: failed to join thread %d\n", argv[0], i); |
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exit (1); |
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} |
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|
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return 0; |
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} |
