def start_tracing_binding(tracename, tracepoints = None):
os.remove('lttng.out')
lttng.create(tracename, "/home/mogeb/git/benchtrace/trace-client")
domain = lttng.Domain()
domain.type = lttng.DOMAIN_KERNEL
handle = lttng.Handle(tracename, domain)
lttng.channel_set_default_attr
lttng.list_tracepoints(handle)
event = lttng.Event()
event.name = 'empty_ioctl_1b'
#event.name = 'getuid'
#event.type = lttng.EVENT_SYSCALL
lttng.enable_event(handle, event, None)
lttng.start(tracename)
def start(session_name: str, ) -> None:
"""
Start LTTng session, and check for errors.
:param session_name: the name of the session
"""
result = lttng.start(session_name)
if result < 0:
raise RuntimeError(
f'failed to start tracing: {lttng.strerror(result)}')
def lttng_start(events=["*"], domain_type=lttng.DOMAIN_UST):
if lttng.session_daemon_alive() == 0:
daemon_cmd = "lttng-sessiond --background"
daemon_cmd += " --pidfile " + sessiond_pidfile
subprocess.check_call(daemon_cmd,
shell=True,
stdout=sessiond_logfile,
stderr=sessiond_logfile)
lttng.destroy(session_name)
ret = lttng.create_snapshot(session_name, trace_path)
if ret < 0:
raise RuntimeError("LTTng: " + lttng.strerror(ret))
domain = lttng.Domain()
domain.type = domain_type
channel = lttng.Channel()
channel.name = "channel0"
lttng.channel_set_default_attr(domain, channel.attr)
han = lttng.Handle(session_name, domain)
if han is None:
raise RuntimeError("LTTng: failed to create handle")
ret = lttng.enable_channel(han, channel)
if ret < 0:
raise RuntimeError("LTTng: " + lttng.strerror(ret))
for name in events:
event = lttng.Event()
event.name = name
event.type = lttng.EVENT_TRACEPOINT
event.loglevel = lttng.EVENT_LOGLEVEL_ALL
ret = lttng.enable_event(han, event, channel.name)
if ret < 0:
raise RuntimeError("LTTng: " + lttng.strerror(ret))
ret = lttng.start(session_name)
if ret < 0:
raise RuntimeError("LTTng: " + lttng.strerror(ret))
def lttng_start(events = ["*"], domain_type = lttng.DOMAIN_UST):
if lttng.session_daemon_alive() == 0:
daemon_cmd = "lttng-sessiond --daemonize --quiet"
daemon_cmd += " --pidfile " + sessiond_pidfile
subprocess.check_call(daemon_cmd, shell=True)
lttng.destroy(session_name)
ret = lttng.create_snapshot(session_name, trace_path)
if ret < 0:
raise RuntimeError("LTTng: " + lttng.strerror(ret))
domain = lttng.Domain()
domain.type = domain_type
channel = lttng.Channel()
channel.name = "channel0"
lttng.channel_set_default_attr(domain, channel.attr)
han = lttng.Handle(session_name, domain)
if han is None:
raise RuntimeError("LTTng: failed to create handle")
ret = lttng.enable_channel(han, channel)
if ret < 0:
raise RuntimeError("LTTng: " + lttng.strerror(ret))
for name in events:
event = lttng.Event()
event.name = name
event.type = lttng.EVENT_TRACEPOINT
event.loglevel = lttng.EVENT_LOGLEVEL_ALL
ret = lttng.enable_event(han, event, channel.name)
if ret < 0:
raise RuntimeError("LTTng: " + lttng.strerror(ret))
ret = lttng.start(session_name)
if ret < 0:
raise RuntimeError("LTTng: " + lttng.strerror(ret))
han = None
han = lttng.Handle(ses_name, domain)
if han is None:
raise LTTngError("Handle not created")
# Enabling all events
event = lttng.Event()
event.type = lttng.EVENT_ALL
event.loglevel_type = lttng.EVENT_LOGLEVEL_ALL
ret = lttng.enable_event(han, event, None)
if ret < 0:
raise LTTngError(lttng.strerror(ret))
# Start, wait, stop
ret = lttng.start(ses_name)
if ret < 0:
raise LTTngError(lttng.strerror(ret))
print("Tracing...")
time.sleep(2)
print("Stopped.")
ret = lttng.stop(ses_name)
if ret < 0:
raise LTTngError(lttng.strerror(ret))
# Destroying tracing session
ret = lttng.destroy(ses_name)
if ret < 0:
raise LTTngError(lttng.strerror(ret))
# BABELTRACE
def lttng_session(session_name, command, names, analyzer):
ts = datetime.datetime.fromtimestamp(time.time()).strftime('%Y-%m-%d-%H-%M-%S-%f')
tracedir = os.environ['HOME'] + "/lttng-traces/" + session_name + "-" + ts
print('Writing trace to ' + tracedir)
lttng.destroy(session_name)
res = lttng.create(session_name, tracedir)
if res<0:
raise Exception("Failed to create lttng session")
dom = lttng.Domain()
dom.type = lttng.DOMAIN_UST
han = None
han = lttng.Handle(session_name, dom)
if han is None:
raise Exception("Handle not created")
channel = lttng.Channel()
channel.name = "channel0"
channel.attr.overwrite = 0
channel.attr.subbuf_size = 1048576
channel.attr.num_subbuf = 8
channel.attr.switch_timer_interval = 0
channel.attr.read_timer_interval = 0
channel.attr.output = lttng.EVENT_MMAP
res = lttng.enable_channel(han, channel)
if res<0:
raise Exception("Failed to enable channel")
for n in names:
# lttng enable-event -u 'memcached:*'
event = lttng.Event()
event.type = lttng.EVENT_TRACEPOINT
event.name = n
lttng.enable_event(han, event, "channel0")
os.system("lttng add-context -s" + session_name + " -u -t perf:thread:cycles -t pthread_id")
# ctx = lttng.EventContext()
# ctx.type = EVENT_CONTEXT_PTHREAD_ID
# res = lttng.add_context(han, ctx, None, None)
# assert res >= 0
#
# ctx.type = EVENT_CONTEXT_PERF_COUNTER
# ctx.u.perf_counter.name = "cpu-cycles"
# res = lttng.add_context(han, ctx, None, None)
# assert res >= 0
lttng.start(session_name)
print("running ", command)
os.system(command)
lttng.stop(session_name)
lttng.destroy(session_name)
subdir = subprocess.check_output(['ls', tracedir+'/ust/pid/']).decode("utf-8").rstrip()
babeldir = tracedir+'/ust/pid/'+subdir
print("analyzing trace in", babeldir)
col = babeltrace.TraceCollection()
if col.add_trace(babeldir, 'ctf') is None:
raise RuntimeError('Cannot add trace')
return analyzer(col)
han = None
han = lttng.Handle(ses_name, domain)
if han is None:
raise LTTngError("Handle not created")
# Enabling all events
event = lttng.Event()
event.type = lttng.EVENT_ALL
event.loglevel_type = lttng.EVENT_LOGLEVEL_ALL
ret = lttng.enable_event(han, event, None)
if ret < 0:
raise LTTngError(lttng.strerror(ret))
# Start, wait, stop
ret = lttng.start(ses_name)
if ret < 0:
raise LTTngError(lttng.strerror(ret))
print("Tracing...")
time.sleep(2)
print("Stopped.")
ret = lttng.stop(ses_name)
if ret < 0:
raise LTTngError(lttng.strerror(ret))
# Destroying tracing session
ret = lttng.destroy(ses_name)
if ret < 0:
raise LTTngError(lttng.strerror(ret))
def __enter__(self):
self._start_session()
r = lttng.start(session_name=self.sess_name)
if r < 0:
raise Exception("lttng.start({nm}) return code {code}".format(
nm=self.sess_name, code=r))
def start(self): ret = lttng.start(self.name) if ret < 0: raise LTTngError(lttng.strerror(ret))
channel.attr.overwrite = 0
channel.attr.subbuf_size = 4096
channel.attr.num_subbuf = 8
channel.attr.switch_timer_interval = 0
channel.attr.read_timer_interval = 200
channel.attr.output = lttng.EVENT_SPLICE
event = lttng.Event()
event.name = "sched_switch"
event.type = lttng.EVENT_TRACEPOINT
event.loglevel_type = lttng.EVENT_LOGLEVEL_ALL
ret = lttng.create(sess_name, trace_dest)
assert ret == 0
han = None
han = lttng.Handle(sess_name, dom)
assert han != None
lttng.enable_channel(han, channel)
lttng.enable_event(han, event, channel.name)
print(lttng.list_channels(han))
lttng.start(sess_name)
time.sleep(0.1)
lttng.stop(sess_name)
ret = lttng.destroy(sess_name)
assert ret == 0