----- "Yolkfull Chow" <yzhou@xxxxxxxxxx> wrote:
> On Mon, Aug 03, 2009 at 02:45:23AM -0400, Michael Goldish wrote:
> >
> > ----- "Yolkfull Chow" <yzhou@xxxxxxxxxx> wrote:
> >
> > > Hi Michael, I just have some comments on what you changed on
> > > stress_boot. :-)
> > >
> > >
> > > On Mon, Aug 03, 2009 at 02:58:21AM +0300, Michael Goldish wrote:
> > > > Take an additional parameter 'clone_address_index_base' which
> > > indicates the
> > > > initial value for 'address_index' for the cloned VMs. This
> value
> > > is
> > > > incremented after each clone is created. I assume the original
> VM
> > > has a single
> > > > NIC; otherwise NICs will end up sharing MAC addresses, which is
> > > bad.
> > > >
> > > > Also, make a few small corrections:
> > > >
> > > > - Take the params for the clones from the original VM's params,
> not
> > > from the
> > > > test's params, because the test's params contain information
> about
> > > several
> > > > VMs, only one of which is the original VM. The original VM's
> params,
> > > on the
> > > > other hand, describe just a single VM (which we want to clone).
> > > >
> > > > - Change the way kill_vm.* parameters are sent to the
> > > postprocessor.
> > > > (The postprocessor doesn't read params from the VM objects but
> > > rather from the
> > > > test's params dict.)
> > > >
> > > > - Replace 'if get_command_status(...)' with 'if
> > > get_command_status(...) != 0'.
> > > >
> > > > - Replace the test command 'ps aux' with 'uname -a'. The silly
> > > reason for this
> > > > is that DSL-4.2.5 doesn't like 'ps aux'. Since 'uname -a' is
> just
> > > as good
> > > > (AFAIK), use it instead.
> > > >
> > > > Signed-off-by: Michael Goldish <mgoldish@xxxxxxxxxx>
> > > > ---
> > > > client/tests/kvm/kvm_tests.cfg.sample | 7 ++++++-
> > > > client/tests/kvm/kvm_tests.py | 14 ++++++--------
> > > > 2 files changed, 12 insertions(+), 9 deletions(-)
> > > >
> > > > diff --git a/client/tests/kvm/kvm_tests.cfg.sample
> > > b/client/tests/kvm/kvm_tests.cfg.sample
> > > > index 3c23432..3a4bf64 100644
> > > > --- a/client/tests/kvm/kvm_tests.cfg.sample
> > > > +++ b/client/tests/kvm/kvm_tests.cfg.sample
> > > > @@ -117,7 +117,12 @@ variants:
> > > > - stress_boot: install setup
> > > > type = stress_boot
> > > > max_vms = 5
> > > > - alive_test_cmd = ps aux
> > > > + alive_test_cmd = uname -a
> > > > + clone_address_index_base = 10
> > > > + kill_vm = yes
> > > > + kill_vm_vm1 = no
> > >
> > >
> > > Actually, there are two methods to deal with started VMs via
> > > framework, one is as soon
> > > as the current test finished and the other is just before next
> test
> > > going to be started.
> > > In this case both methods equal somewhat between each other I
> think,
> > > and
> > > I had chosen the later one. But if you had done some testing and
> > > proved the previous one is better, I would agree.
> >
> > It's not that I tested and found the former to be better, it's just
> that
> > if a user runs only stress_boot, it makes sense to clean up at the
> end
> > of the test, not at the beginning of the next one (because there's
> no
> > next one). Since you're adding VMs to the postprocessor's params
> > (params['vms'] += " " + vm_name) I thought we might as well use
> that.
> > (In order to clean up the VMs automatically when the next test
> starts,
> > we don't need to add the VM to those params -- only to 'env'.)
>
> Hmm...yes, if users only want to run stress_boot, cleaning up should
> be
> implemented at the end of the test.
>
> >
> > >
> > >
> > > > + kill_vm_gracefully = no
> > >
> > > This has been specified within code during cloning.
> >
> > Right, but the postprocessor is supposed to ignore that, because it
> doesn't
> > look at the params inside the VM -- it looks at test params that get
> to the
> > postprocessor.
> >
> > >
> > > > + extra_params += " -snapshot"
> > >
> > > If you add this option '-snapshot' here, the first VM will be in
> > > snapshot
> > > mode as well which will affect next test.
> >
> > Which is good in my opinion, because I don't want the first VM
> writing to the
> > same image that others are reading from. It sounds like it might
> >
> > Let me know what you think.
>
> My opinion is, since the scenario that the first VM using
> non-snapshot
> mode while the others do has not caused any problem, why not just keep
> the first VM
> in non-snapshot mode and let it to be used in next test which really
> save booting time?
>
> What do you think? Please let me know if there is a trap in such
> scenario.
> Thanks. :-)
I'm not sure if it really will cause trouble, but it sounds like it might,
since we're modifying an image that's being used by another VM, if I
understand correctly. I don't think we actually have to see a test fail
before we decide to avoid doing something -- it's enough just to know that
something is bad practice. I'm not even sure this is bad practice, but I
want to be on the safe side anyway. Can anyone shed some light on this?
(Is it risky to start a VM without -snapshot, and in parallel start other
VMs using the same image with -snapshot?)
> >
> > Thanks,
> > Michael
> >
> > >
> > > >
> > > > - shutdown: install setup
> > > > type = shutdown
> > > > diff --git a/client/tests/kvm/kvm_tests.py
> > > b/client/tests/kvm/kvm_tests.py
> > > > index 9784ec9..308db97 100644
> > > > --- a/client/tests/kvm/kvm_tests.py
> > > > +++ b/client/tests/kvm/kvm_tests.py
> > > > @@ -541,8 +541,8 @@ def run_stress_boot(tests, params, env):
> > > > raise error.TestFail("Could not log into first guest")
> > > >
> > > > num = 2
> > > > - vms = []
> > > > sessions = [session]
> > > > + address_index = int(params.get("clone_address_index_base",
> > > 10))
> > > >
> > > > # boot the VMs
> > > > while num <= int(params.get("max_vms")):
> > > > @@ -550,15 +550,12 @@ def run_stress_boot(tests, params, env):
> > > > vm_name = "vm" + str(num)
> > > >
> > > > # clone vm according to the first one
> > > > - vm_params = params.copy()
> > > > - vm_params['image_snapshot'] = "yes"
> > > > - vm_params['kill_vm'] = "yes"
> > > > - vm_params['kill_vm_gracefully'] = "no"
> > > > + vm_params = vm.get_params().copy()
> > > > + vm_params["address_index"] = str(address_index)
> > > > curr_vm = vm.clone(vm_name, vm_params)
> > > > kvm_utils.env_register_vm(env, vm_name, curr_vm)
> > > > params['vms'] += " " + vm_name
> > > >
> > > > - #vms.append(curr_vm)
> > > > logging.info("Booting guest #%d" % num)
> > > > if not curr_vm.create():
> > > > raise error.TestFail("Cannot create VM #%d" %
> num)
> > > > @@ -571,10 +568,11 @@ def run_stress_boot(tests, params, env):
> > > > sessions.append(curr_vm_session)
> > > >
> > > > # check whether all previous ssh sessions are
> > > responsive
> > > > - for i, vm_session in enumerate(sessions):
> > > > - if
> > > vm_session.get_command_status(params.get("alive_test_cmd")):
> > > > + for i, se in enumerate(sessions):
> > > > + if
> > > se.get_command_status(params.get("alive_test_cmd")) != 0:
> > > > raise error.TestFail("Session #%d is not
> > > responsive" % i)
> > > > num += 1
> > > > + address_index += 1
> > > >
> > > > except (error.TestFail, OSError):
> > > > for se in sessions:
> > > > --
> > > > 1.5.4.1
> > > >
> > > > --
> > > > To unsubscribe from this list: send the line "unsubscribe kvm"
> in
> > > > the body of a message to majordomo@xxxxxxxxxxxxxxx
> > > > More majordomo info at
> http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
