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import common as com
import os
import time
import run.litmus_util as lu
import shutil as sh
import traceback
from operator import methodcaller
class ExperimentException(Exception):
'''Used to indicate when there are problems with an experiment.'''
def __init__(self, name):
self.name = name
class ExperimentDone(ExperimentException):
'''Raised when an experiment looks like it's been run already.'''
def __str__(self):
return "Experiment finished already: %d" % self.name
class ExperimentFailed(ExperimentException):
def __str__(self):
return "Experiment failed during execution: %d" % self.name
class SystemCorrupted(Exception):
pass
class Experiment(object):
'''Execute one task-set and save the results. Experiments have unique IDs.'''
INTERRUPTED_DIR = ".interrupted"
def __init__(self, name, scheduler, working_dir, finished_dir,
proc_entries, executables, tracer_types):
'''Run an experiment, optionally wrapped in tracing.'''
self.name = name
self.scheduler = scheduler
self.working_dir = working_dir
self.finished_dir = finished_dir
self.proc_entries = proc_entries
self.executables = executables
self.exec_out = None
self.exec_err = None
self.task_batch = com.num_cpus()
self.__make_dirs()
self.__assign_executable_cwds()
self.__setup_tracers(tracer_types)
def __setup_tracers(self, tracer_types):
tracers = [ t(self.working_dir) for t in tracer_types ]
self.regular_tracers = [t for t in tracers if not t.is_exact()]
self.exact_tracers = [t for t in tracers if t.is_exact()]
for t in tracers:
self.log("Enabling %s" % t.get_name())
def __make_dirs(self):
interrupted = None
if os.path.exists(self.finished_dir):
raise ExperimentDone(self.name)
if os.path.exists(self.working_dir):
self.log("Found interrupted experiment, saving in %s" %
Experiment.INTERRUPTED_DIR)
interrupted = "%s/%s" % (os.path.split(self.working_dir)[0],
Experiment.INTERRUPTED_DIR)
if os.path.exists(interrupted):
sh.rmtree(interrupted)
os.rename(self.working_dir, interrupted)
os.mkdir(self.working_dir)
if interrupted:
os.rename(interrupted, "%s/%s" % (self.working_dir,
os.path.split(interrupted)[1]))
def __assign_executable_cwds(self):
def assign_cwd(executable):
executable.cwd = self.working_dir
map(assign_cwd, self.executables)
def __kill_all(self):
# Give time for whatever failed to finish failing
time.sleep(2)
released = lu.release_tasks()
self.log("Re-released %d tasks" % released)
time.sleep(5)
self.log("Killing all tasks")
for e in self.executables:
try:
e.kill()
except:
pass
time.sleep(2)
def __run_tasks(self):
self.log("Starting %d tasks" % len(self.executables))
for i,e in enumerate(self.executables):
try:
e.execute()
except:
raise Exception("Executable failed: %s" % e)
self.log("Sleeping until tasks are ready for release...")
start = time.time()
while lu.waiting_tasks() < len(self.executables):
if time.time() - start > 30.0:
s = "waiting: %d, submitted: %d" %\
(lu.waiting_tasks(), len(self.executables))
raise Exception("Too much time spent waiting for tasks! %s" % s)
time.sleep(1)
# Exact tracers (like overheads) must be started right after release or
# measurements will be full of irrelevant records
self.log("Starting %d released tracers" % len(self.exact_tracers))
map(methodcaller('start_tracing'), self.exact_tracers)
time.sleep(1)
try:
self.log("Releasing %d tasks" % len(self.executables))
released = lu.release_tasks()
if released != len(self.executables):
# Some tasks failed to release, kill all tasks and fail
# Need to release non-released tasks before they can be killed
raise Exception("Released %s tasks, expected %s tasks" %
(released, len(self.executables)))
self.log("Waiting for program to finish...")
for e in self.executables:
if not e.wait():
raise Exception("Executable %s failed to complete!" % e)
finally:
# And these must be stopped here for the same reason
self.log("Stopping exact tracers")
map(methodcaller('stop_tracing'), self.exact_tracers)
def __save_results(self):
os.rename(self.working_dir, self.finished_dir)
def log(self, msg):
print("[Exp %s]: %s" % (self.name, msg))
def run_exp(self):
self.__check_system()
succ = False
try:
self.__setup()
try:
self.__run_tasks()
self.log("Saving results in %s" % self.finished_dir)
succ = True
except:
traceback.print_exc()
self.__kill_all()
raise ExperimentFailed(self.name)
finally:
self.__teardown()
finally:
self.log("Switching to Linux scheduler")
# Give the tasks 10 seconds to finish before bailing
start = time.time()
while lu.all_tasks() > 0:
if time.time() - start < 10.0:
raise SystemCorrupted("%d tasks still running!" %
lu.all_tasks())
lu.switch_scheduler("Linux")
if succ:
self.__save_results()
self.log("Experiment done!")
def __check_system(self):
running = lu.all_tasks()
if running:
raise SystemCorrupted("%d tasks already running!" % running)
sched = lu.scheduler()
if sched != "Linux":
raise SystemCorrupted("Scheduler is %s, should be Linux" % sched)
def __setup(self):
self.log("Writing %d proc entries" % len(self.proc_entries))
map(methodcaller('write_proc'), self.proc_entries)
self.log("Switching to %s" % self.scheduler)
lu.switch_scheduler(self.scheduler)
self.log("Starting %d regular tracers" % len(self.regular_tracers))
map(methodcaller('start_tracing'), self.regular_tracers)
self.exec_out = open('%s/exec-out.txt' % self.working_dir, 'w')
self.exec_err = open('%s/exec-err.txt' % self.working_dir, 'w')
def set_out(executable):
executable.stdout_file = self.exec_out
executable.stderr_file = self.exec_err
map(set_out, self.executables)
def __teardown(self):
self.exec_out and self.exec_out.close()
self.exec_err and self.exec_err.close()
self.log("Stopping regular tracers")
map(methodcaller('stop_tracing'), self.regular_tracers)
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