Re: [Qemu-devel] Help needed: test-qht-par hangs on Travis

["Emilio G. Cota" <cota@braap.org>]

On Fri, Dec 07, 2018 at 18:41:07 -0200, Eduardo Habkost wrote:
> I've noticed QEMU Travis builds are failing recently, and they
> seem to happen only on the --enable-gprof jobs.  I have enabled
> V=1 and noticed that the jobs are hanging inside test-qht-par.
> 
> Example here (look for "/qht/parallel/2threads-0%updates-1s"):
> 
> https://travis-ci.org/ehabkost/qemu-hacks/jobs/465081311
> 
> Does anybody have any idea why?

So if I read that output correctly, it seems that the second
test in qht-par never completes.

Enabling gprof and gcov (as in that build) should just lower
the throughput of the benchmark (test-qht-par invokes qht-bench),
but the duration should be the same (1 second per test, so no need
to wait for 10 minutes).

Can you try re-running the test, after applying the appended patch?
(It disables the "resize" thread.)

Also, does it reliably hang on Travis, or are these hangs
intermittent?

Thanks,

		Emilio
---
diff --git a/tests/test-qht-par.c b/tests/test-qht-par.c
index d8a83caf5c..83ac92e430 100644
--- a/tests/test-qht-par.c
+++ b/tests/test-qht-par.c
@@ -6,7 +6,7 @@
  */
 #include "qemu/osdep.h"

-#define TEST_QHT_STRING "tests/qht-bench 1>/dev/null 2>&1 -R -S0.1 -D10000 -N1 "
+#define TEST_QHT_STRING "tests/qht-bench 1>/dev/null 2>&1 -R "

 static void test_qht(int n_threads, int update_rate, int duration)
 {