diff options
Diffstat (limited to 'stdlib')
| -rw-r--r-- | stdlib/tst-arc4random-thread.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/stdlib/tst-arc4random-thread.c b/stdlib/tst-arc4random-thread.c index 3373d4d..daba828 100644 --- a/stdlib/tst-arc4random-thread.c +++ b/stdlib/tst-arc4random-thread.c @@ -17,23 +17,23 @@ <https://www.gnu.org/licenses/>. */ #include <array_length.h> +#include <sched.h> #include <stdio.h> -#include <string.h> #include <stdlib.h> +#include <string.h> #include <support/check.h> #include <support/namespace.h> #include <support/support.h> #include <support/xthread.h> /* Number of arc4random_buf calls per thread. */ -enum { count_per_thread = 5000 }; +enum { count_per_thread = 2048 }; /* Number of threads computing randomness. */ -enum { inner_threads = 5 }; +enum { inner_threads = 4 }; -/* Number of threads launching other threads. Chosen as to not to - overload the system. */ -enum { outer_threads = 7 }; +/* Number of threads launching other threads. */ +static int outer_threads = 1; /* Number of launching rounds performed by the outer threads. */ enum { outer_rounds = 10 }; @@ -331,6 +331,18 @@ do_test_func (const char *fname, void (*func)(unsigned char *, size_t)) static int do_test (void) { + /* Do not run more threads than the maximum of schedulable CPUs. */ + cpu_set_t cpuset; + if (sched_getaffinity (0, sizeof cpuset, &cpuset) == 0) + { + unsigned int ncpus = CPU_COUNT (&cpuset); + /* Limit the number to not overload the system. */ + outer_threads = (ncpus / 2) / inner_threads ?: 1; + } + + printf ("info: outer_threads=%d inner_threads=%d\n", outer_threads, + inner_threads); + do_test_func ("arc4random", generate_arc4random); do_test_func ("arc4random_buf", generate_arc4random_buf); do_test_func ("arc4random_uniform", generate_arc4random_uniform); |