[Qemu-devel] postcopy test under load

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

Hi Peter,
  I was trying to reproduce the occasional travis postcopy
test case failures you were seeing; I can reproduce them but
only with tcg - which makes me wonder if the problem is in
the test or actually in tcg.

My test is:

export QTEST_QEMU_BINARY=wherever/try/x86_64-softmmu/qemu-system-x86_64
cd whereever/try
for NUM in $(seq 1 100)
do
  echo 'while true; do ./tests/migration-test || break; done' | taskset 2 bash &
done


so all of the instances are pinned to one core using taskset.

I had 100 instances of kvm running overnight (x86-64) and didn't
hit any problems.
30 instances of tcg hit the problem in 5 minutes (x86-64 on x86-64).

Dave
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK