def run_timedrift(test, params, env):
"""
Time drift test (mainly for Windows guests):
1) Log into a guest.
2) Take a time reading from the guest and host.
3) Run load on the guest and host.
4) Take a second time reading.
5) Stop the load and rest for a while.
6) Take a third time reading.
7) If the drift immediately after load is higher than a user-
specified value (in %), fail.
If the drift after the rest period is higher than a user-specified value,
fail.
@param test: KVM test object.
@param params: Dictionary with test parameters.
@param env: Dictionary with the test environment.
"""
# Helper functions
def set_cpu_affinity(pid, mask):
"""
Set the CPU affinity of all threads of the process with PID pid.
Do this recursively for all child processes as well.
@param pid: The process ID.
@param mask: The CPU affinity mask.
@return: A dict containing the previous mask for each thread.
"""
tids = commands.getoutput("ps -L --pid=%s -o lwp=" % pid).split()
prev_masks = {}
for tid in tids:
prev_mask = commands.getoutput("taskset -p %s" % tid).split()[-1]
prev_masks[tid] = prev_mask
commands.getoutput("taskset -p %s %s" % (mask, tid))
children = commands.getoutput("ps --ppid=%s -o pid=" % pid).split()
for child in children:
prev_masks.update(set_cpu_affinity(child, mask))
return prev_masks
def restore_cpu_affinity(prev_masks):
"""
Restore the CPU affinity of several threads.
@param prev_masks: A dict containing TIDs as keys and masks as values.
"""
for tid, mask in prev_masks.items():
commands.getoutput("taskset -p %s %s" % (mask, tid))
vm = env.get_vm(params["main_vm"])
vm.verify_alive()
timeout = int(params.get("login_timeout", 360))
session = vm.wait_for_login(timeout=timeout)
# Collect test parameters:
# Command to run to get the current time
time_command = params.get("time_command")
# Filter which should match a string to be passed to time.strptime()
time_filter_re = params.get("time_filter_re")
# Time format for time.strptime()
time_format = params.get("time_format")
guest_load_command = params.get("guest_load_command")
guest_load_stop_command = params.get("guest_load_stop_command")
host_load_command = params.get("host_load_command")
guest_load_instances = int(params.get("guest_load_instances", "1"))
host_load_instances = int(params.get("host_load_instances", "0"))
# CPU affinity mask for taskset
cpu_mask = params.get("cpu_mask", "0xFF")
load_duration = float(params.get("load_duration", "30"))
rest_duration = float(params.get("rest_duration", "10"))
drift_threshold = float(params.get("drift_threshold", "200"))
drift_threshold_after_rest = float(params.get("drift_threshold_after_rest",
"200"))
guest_load_sessions = []
host_load_sessions = []
try:
# Set the VM's CPU affinity
prev_affinity = set_cpu_affinity(vm.get_shell_pid(), cpu_mask)
try:
# Open shell sessions with the guest
logging.info("Starting load on guest...")
for i in range(guest_load_instances):
load_session = vm.login()
# Set output func to None to stop it from being called so we
# can change the callback function and the parameters it takes
# with no problems
load_session.set_output_func(None)
load_session.set_output_params(())
load_session.set_output_prefix("(guest load %d) " % i)
load_session.set_output_func(logging.debug)
guest_load_sessions.append(load_session)
# Get time before load
# (ht stands for host time, gt stands for guest time)
(ht0, gt0) = virt_test_utils.get_time(session,
time_command,
time_filter_re,
time_format)
# Run some load on the guest
for load_session in guest_load_sessions:
load_session.sendline(guest_load_command)
# Run some load on the host
logging.info("Starting load on host...")
for i in range(host_load_instances):
host_load_sessions.append(
aexpect.run_bg(host_load_command,
output_func=logging.debug,
output_prefix="(host load %d) " % i,
timeout=0.5))
# Set the CPU affinity of the load process
pid = host_load_sessions[-1].get_pid()
set_cpu_affinity(pid, cpu_mask)
# Sleep for a while (during load)
logging.info("Sleeping for %s seconds...", load_duration)
time.sleep(load_duration)
# Get time delta after load
(ht1, gt1) = virt_test_utils.get_time(session,
time_command,
time_filter_re,
time_format)
# Report results
host_delta = ht1 - ht0
guest_delta = gt1 - gt0
drift = 100.0 * (host_delta - guest_delta) / host_delta
logging.info("Host duration: %.2f", host_delta)
logging.info("Guest duration: %.2f", guest_delta)
logging.info("Drift: %.2f%%", drift)
finally:
logging.info("Cleaning up...")
# Restore the VM's CPU affinity
restore_cpu_affinity(prev_affinity)
# Stop the guest load
if guest_load_stop_command:
session.cmd_output(guest_load_stop_command)
# Close all load shell sessions
for load_session in guest_load_sessions:
load_session.close()
for load_session in host_load_sessions:
load_session.close()
# Sleep again (rest)
logging.info("Sleeping for %s seconds...", rest_duration)
time.sleep(rest_duration)
# Get time after rest
(ht2, gt2) = virt_test_utils.get_time(session,
time_command,
time_filter_re,
time_format)
finally:
session.close()
# Report results
host_delta_total = ht2 - ht0
guest_delta_total = gt2 - gt0
drift_total = 100.0 * (host_delta_total - guest_delta_total) / host_delta
logging.info("Total host duration including rest: %.2f", host_delta_total)
logging.info("Total guest duration including rest: %.2f", guest_delta_total)
logging.info("Total drift after rest: %.2f%%", drift_total)
# Fail the test if necessary
if abs(drift) > drift_threshold:
raise error.TestFail("Time drift too large: %.2f%%" % drift)
if abs(drift_total) > drift_threshold_after_rest:
raise error.TestFail("Time drift too large after rest period: %.2f%%"
% drift_total)
def run_timedrift_with_migration(test, params, env):
"""
Time drift test with migration:
1) Log into a guest.
2) Take a time reading from the guest and host.
3) Migrate the guest.
4) Take a second time reading.
5) If the drift (in seconds) is higher than a user specified value, fail.
@param test: KVM test object.
@param params: Dictionary with test parameters.
@param env: Dictionary with the test environment.
"""
vm = env.get_vm(params["main_vm"])
vm.verify_alive()
timeout = int(params.get("login_timeout", 360))
session = vm.wait_for_login(timeout=timeout)
# Collect test parameters:
# Command to run to get the current time
time_command = params.get("time_command")
# Filter which should match a string to be passed to time.strptime()
time_filter_re = params.get("time_filter_re")
# Time format for time.strptime()
time_format = params.get("time_format")
drift_threshold = float(params.get("drift_threshold", "10"))
drift_threshold_single = float(params.get("drift_threshold_single", "3"))
migration_iterations = int(params.get("migration_iterations", 1))
try:
# Get initial time
# (ht stands for host time, gt stands for guest time)
(ht0, gt0) = virt_test_utils.get_time(session, time_command,
time_filter_re, time_format)
# Migrate
for i in range(migration_iterations):
# Get time before current iteration
(ht0_, gt0_) = virt_test_utils.get_time(session, time_command,
time_filter_re, time_format)
session.close()
# Run current iteration
logging.info("Migrating: iteration %d of %d...",
(i + 1), migration_iterations)
vm.migrate()
# Log in
logging.info("Logging in after migration...")
session = vm.wait_for_login(timeout=30)
logging.info("Logged in after migration")
# Get time after current iteration
(ht1_, gt1_) = virt_test_utils.get_time(session, time_command,
time_filter_re, time_format)
# Report iteration results
host_delta = ht1_ - ht0_
guest_delta = gt1_ - gt0_
drift = abs(host_delta - guest_delta)
logging.info("Host duration (iteration %d): %.2f",
(i + 1), host_delta)
logging.info("Guest duration (iteration %d): %.2f",
(i + 1), guest_delta)
logging.info("Drift at iteration %d: %.2f seconds",
(i + 1), drift)
# Fail if necessary
if drift > drift_threshold_single:
raise error.TestFail("Time drift too large at iteration %d: "
"%.2f seconds" % (i + 1, drift))
# Get final time
(ht1, gt1) = virt_test_utils.get_time(session, time_command,
time_filter_re, time_format)
finally:
if session:
session.close()
# Report results
host_delta = ht1 - ht0
guest_delta = gt1 - gt0
drift = abs(host_delta - guest_delta)
logging.info("Host duration (%d migrations): %.2f",
migration_iterations, host_delta)
logging.info("Guest duration (%d migrations): %.2f",
migration_iterations, guest_delta)
logging.info("Drift after %d migrations: %.2f seconds",
migration_iterations, drift)
# Fail if necessary
if drift > drift_threshold:
raise error.TestFail("Time drift too large after %d migrations: "
"%.2f seconds" % (migration_iterations, drift))
def run_timedrift_with_stop(test, params, env):
"""
Time drift test with stop/continue the guest:
1) Log into a guest.
2) Take a time reading from the guest and host.
3) Stop the running of the guest
4) Sleep for a while
5) Continue the guest running
6) Take a second time reading.
7) If the drift (in seconds) is higher than a user specified value, fail.
@param test: KVM test object.
@param params: Dictionary with test parameters.
@param env: Dictionary with the test environment.
"""
login_timeout = int(params.get("login_timeout", 360))
sleep_time = int(params.get("sleep_time", 30))
vm = env.get_vm(params["main_vm"])
vm.verify_alive()
session = vm.wait_for_login(timeout=login_timeout)
# Collect test parameters:
# Command to run to get the current time
time_command = params.get("time_command")
# Filter which should match a string to be passed to time.strptime()
time_filter_re = params.get("time_filter_re")
# Time format for time.strptime()
time_format = params.get("time_format")
drift_threshold = float(params.get("drift_threshold", "10"))
drift_threshold_single = float(params.get("drift_threshold_single", "3"))
stop_iterations = int(params.get("stop_iterations", 1))
stop_time = int(params.get("stop_time", 60))
try:
# Get initial time
# (ht stands for host time, gt stands for guest time)
(ht0, gt0) = virt_test_utils.get_time(session, time_command,
time_filter_re, time_format)
# Stop the guest
for i in range(stop_iterations):
# Get time before current iteration
(ht0_, gt0_) = virt_test_utils.get_time(session, time_command,
time_filter_re, time_format)
# Run current iteration
logging.info("Stop %s second: iteration %d of %d...",
stop_time, (i + 1), stop_iterations)
vm.monitor.cmd("stop")
time.sleep(stop_time)
vm.monitor.cmd("cont")
# Sleep for a while to wait the interrupt to be reinjected
logging.info("Waiting for the interrupt to be reinjected ...")
time.sleep(sleep_time)
# Get time after current iteration
(ht1_, gt1_) = virt_test_utils.get_time(session, time_command,
time_filter_re, time_format)
# Report iteration results
host_delta = ht1_ - ht0_
guest_delta = gt1_ - gt0_
drift = abs(host_delta - guest_delta)
logging.info("Host duration (iteration %d): %.2f",
(i + 1), host_delta)
logging.info("Guest duration (iteration %d): %.2f",
(i + 1), guest_delta)
logging.info("Drift at iteration %d: %.2f seconds",
(i + 1), drift)
# Fail if necessary
if drift > drift_threshold_single:
raise error.TestFail("Time drift too large at iteration %d: "
"%.2f seconds" % (i + 1, drift))
# Get final time
(ht1, gt1) = virt_test_utils.get_time(session, time_command,
time_filter_re, time_format)
finally:
if session:
session.close()
# Report results
host_delta = ht1 - ht0
guest_delta = gt1 - gt0
drift = abs(host_delta - guest_delta)
logging.info("Host duration (%d stops): %.2f",
stop_iterations, host_delta)
logging.info("Guest duration (%d stops): %.2f",
stop_iterations, guest_delta)
logging.info("Drift after %d stops: %.2f seconds",
stop_iterations, drift)
# Fail if necessary
if drift > drift_threshold:
raise error.TestFail("Time drift too large after %d stops: "
"%.2f seconds" % (stop_iterations, drift))
def run_timedrift_with_reboot(test, params, env):
"""
Time drift test with reboot:
1) Log into a guest.
2) Take a time reading from the guest and host.
3) Reboot the guest.
4) Take a second time reading.
5) If the drift (in seconds) is higher than a user specified value, fail.
@param test: KVM test object.
@param params: Dictionary with test parameters.
@param env: Dictionary with the test environment.
"""
vm = env.get_vm(params["main_vm"])
vm.verify_alive()
timeout = int(params.get("login_timeout", 360))
session = vm.wait_for_login(timeout=timeout)
# Collect test parameters:
# Command to run to get the current time
time_command = params.get("time_command")
# Filter which should match a string to be passed to time.strptime()
time_filter_re = params.get("time_filter_re")
# Time format for time.strptime()
time_format = params.get("time_format")
drift_threshold = float(params.get("drift_threshold", "10"))
drift_threshold_single = float(params.get("drift_threshold_single", "3"))
reboot_iterations = int(params.get("reboot_iterations", 1))
try:
# Get initial time
# (ht stands for host time, gt stands for guest time)
(ht0, gt0) = virt_test_utils.get_time(session, time_command,
time_filter_re, time_format)
# Reboot
for i in range(reboot_iterations):
# Get time before current iteration
(ht0_, gt0_) = virt_test_utils.get_time(session, time_command,
time_filter_re,
time_format)
# Run current iteration
logging.info("Rebooting: iteration %d of %d...", (i + 1),
reboot_iterations)
session = vm.reboot(session)
# Get time after current iteration
(ht1_, gt1_) = virt_test_utils.get_time(session, time_command,
time_filter_re,
time_format)
# Report iteration results
host_delta = ht1_ - ht0_
guest_delta = gt1_ - gt0_
drift = abs(host_delta - guest_delta)
logging.info("Host duration (iteration %d): %.2f", (i + 1),
host_delta)
logging.info("Guest duration (iteration %d): %.2f", (i + 1),
guest_delta)
logging.info("Drift at iteration %d: %.2f seconds", (i + 1), drift)
# Fail if necessary
if drift > drift_threshold_single:
raise error.TestFail("Time drift too large at iteration %d: "
"%.2f seconds" % (i + 1, drift))
# Get final time
(ht1, gt1) = virt_test_utils.get_time(session, time_command,
time_filter_re, time_format)
finally:
if session:
session.close()
# Report results
host_delta = ht1 - ht0
guest_delta = gt1 - gt0
drift = abs(host_delta - guest_delta)
logging.info("Host duration (%d reboots): %.2f", reboot_iterations,
host_delta)
logging.info("Guest duration (%d reboots): %.2f", reboot_iterations,
guest_delta)
logging.info("Drift after %d reboots: %.2f seconds", reboot_iterations,
drift)
# Fail if necessary
if drift > drift_threshold:
raise error.TestFail("Time drift too large after %d reboots: "
"%.2f seconds" % (reboot_iterations, drift))
def run_time_manage(test, params, env):
"""
Time manage test:
1) Generate stress in host.
2) Run atleast 15 vms with "driftfix=slew" option
3) Reboot the guest.
4) Repeat the step 3 for all guests and check whether the guest
responds properly(not any watchdog reported).
5) TODO: Improve the way of checking the response and
run some stress inside guest too.
6) Continue the step 4 for 10 iterations and
record the guest/host realtime, calculate drift in time for
each iterations.
7) Print the drift values for all sessions
8) TODO: Validate if the drift value has to be within defined value
@param test: KVM test object.
@param params: Dictionary with test parameters.
@param env: Dictionary with the test environment.
"""
# Checking the main vm is alive
vm = env.get_vm(params["main_vm"])
vm.verify_alive()
timeout = int(params.get("login_timeout", 360))
session = vm.wait_for_login(timeout=timeout)
# Collect test parameters
login_timeout = float(params.get("login_timeout", 240))
host_load_command = params.get("host_load_command")
host_load_kill_command = params.get("host_load_kill_command")
time_command = params.get("time_command")
time_filter_re = params.get("time_filter_re")
time_format = params.get("time_format")
# Intialize the variables
itr = 0
num = 2
host_load_sessions = []
sessions = [session]
prev_time = []
curr_time = []
timedrift = []
totaldrift = []
vmnames =["vm1"]
# Run some load on the host
logging.info("Starting load on host.")
host_load_sessions.append(aexpect.run_bg(host_load_command,
output_func=logging.debug,
output_prefix="host load ",
timeout=0.5))
# Boot the VMs
try:
while num <= int(params.get("max_vms")):
# Clone vm according to the first one
vm_name = "vm%d" % num
vmnames.append(vm_name)
vm_params = vm.params.copy()
curr_vm = vm.clone(vm_name, vm_params)
env.register_vm(vm_name, curr_vm)
virt_env_process.preprocess_vm(test, vm_params, env, vm_name)
params["vms"] += " " + vm_name
sessions.append(curr_vm.wait_for_login(timeout=login_timeout))
logging.info("Guest #%d booted up successfully", num)
# Check whether all previous shell sessions are responsive
error.context("checking responsiveness of the booted guest")
for se in sessions:
se.cmd(params.get("alive_test_cmd"))
num += 1
while itr <= int(params.get("max_itrs")):
for vmid,se in enumerate(sessions):
# Get the respective vm object
vmname = "vm%d" % (vmid +1)
vm = env.get_vm(vmname)
# Run current iteration
logging.info("Rebooting:vm%d iteration %d " % ((vmid + 1), itr))
se = vm.reboot(se ,timeout=timeout)
# Remember the current changed session
sessions[vmid] = se
error.context("checking responsiveness of guest")
se.cmd(params.get("alive_test_cmd"))
if itr == 0:
(ht0, gt0) = virt_test_utils.get_time(se, time_command,
time_filter_re, time_format)
prev_time.append((ht0, gt0))
else:
(ht1, gt1) = virt_test_utils.get_time(se, time_command,
time_filter_re, time_format)
curr_time.append((ht1, gt1))
if itr != 0:
for i in range(int(params.get("max_vms"))):
hdelta = curr_time[i][0] - prev_time[i][0]
gdelta = curr_time[i][1] - prev_time[i][1]
drift = format( 100.0 * (hdelta - gdelta) / hdelta, ".2f" )
timedrift.append(drift)
totaldrift.append(timedrift)
prev_time = curr_time
timedrift = []
curr_time = []
# Wait for some time before next iteration
time.sleep(30)
itr += 1
logging.info("The time drift values for all VM sessions/iterations")
logging.info("VM-Name:%s" % vmnames)
for idx,value in enumerate(totaldrift):
logging.info("itr-%2d:%s" % (idx+1,value))
finally:
for se in sessions:
# Closing all the sessions.
se.close()
logging.info("killing load on host.")
host_load_sessions.append(aexpect.run_bg(host_load_kill_command,
output_func=logging.debug,
output_prefix="host load kill",
timeout=0.5))
