[Bug testsuite/31312] attach-many-short-lived-threads gives inconsistent results

["cel at linux dot ibm.com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31312

--- Comment #8 from Carl E Love <cel at linux dot ibm.com> ---
I put together a quick script to run the test 10 times.  

I tried it a couple of Power 10 systems.  Here is the patch I have been playing
with to see if it helps:

+set timeout 20
+
 set options { "additional_flags=-DTIMEOUT=$timeout" debug pthreads }

 if {[prepare_for_testing "failed to prepare" $testfile $srcfile \
         $options] == -1} {
     return -1
 }

-test
+with_timeout_factor 3 {
+    test
+}

The default value of timeout was 10.

I have tried a couple of different distros to see if that makes any difference.
I tried to watch top to see what the load average was during the runs.  

Power 10, Fedora Linux 38
Failed 2 out of 10 times with the patch to increase the timeout
Failed 7 out of 10 times with patch, timeout factor of 2.  Note machine was
heavily used some of the time.
Passed 10 out of 10, with patch and timeout factor of 10.  Machine was not very
busy, ran overnight.


Power 10, Red Hat Enterprise Linux 9.3
Failed 3 out of 10 times without the patch

Power 10 Ubuntu 22.04
Failed 2 out of 10 times, without patch
Failed 2 out of 10 times with patch, and a time out factor of 10.

Power 9, Ubuntu 22.04
Success 20 out of 20 runs.

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