[glibc] stdlib: Tune down fork arc4random tests

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e6ce346d0791410a2e6ec9df1bc35e6acd4bca18

commit e6ce346d0791410a2e6ec9df1bc35e6acd4bca18
Author: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Date:   Thu Jun 1 12:59:19 2023 -0300

    stdlib: Tune down fork arc4random tests
    
    There is no fork detection on current arc4random implementation, so
    use lower subprocess on fork tests.  The tests now run on 0.1s
    instead of 8s on a Ryzen9 5900X.
    
    Checked on x86_64-linux-gnu.
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

Diff:
---
 stdlib/tst-arc4random-fork.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/stdlib/tst-arc4random-fork.c b/stdlib/tst-arc4random-fork.c
index a69ec3968f..65d5893f5e 100644
--- a/stdlib/tst-arc4random-fork.c
+++ b/stdlib/tst-arc4random-fork.c
@@ -30,14 +30,10 @@
 #include <unistd.h>
 
 /* Perform multiple runs.  The subsequent runs start with an
-   already-initialized random number generator.  (The number 1500 was
-   seen to reproduce failures reliable in case of a race condition in
-   the fork detection code.)  */
-enum { runs = 1500 };
-
-/* One hundred processes in total.  This should be high enough to
-   expose any issues, but low enough not to tax the overall system too
-   much.  */
+   already-initialized random number generator.  */
+enum { runs = 10 };
+
+/* Total number of spawned processes on each run.  */
 enum { subprocesses = 49 };
 
 /* The total number of processes.  */