Hi Anette,
We are using the following for a live streaming:
export TC=MySession
#-- see if there is any instrumented application is running
lttng list -u
ps -ef |egrep 'lttng'
#-- Launch relayd with ControlPort 53000, DataPort 53001 and LiveViewPort
53002
# whatever relayd collects, will be stored in /tmp/$TC
lttng-relayd -C tcp://localhost:53000 -D tcp://localhost:53001 -L
net://localhost:53002 -o /tmp/$TC &
#-- Create session using Control and Data ports as specified in relayd
lttng create $TC --live 1000000 -U net://localhost:53000:53001/./
lttng list
#-- We want to use per-Uid buffer instead of the default per-PID buffer
lttng enable-channel chan1 -u --buffers-uid
lttng enable-event -s $TC -u -c chan1 tracepoints_that_you_want_to_trace_on
lttng start $TC;
lttng list $TC
#-- make sure you see the tracepoints that your session is tracing on from
the
# output of the next command, otherwise, your session / live view will not
# be able to capture anything
lttng list -u
#----- live viewing: -----
# to get a list of viewable traces (note the live view port is used here)
babeltrace -i lttng-live net://localhost:53002
net://localhost:53002/host/SC-1/MySession (timer = 1000000, 17
stream(s), 0 client(s) connected)
# Start the live view on node SC-1
babeltrace -i lttng-live net://localhost:53002/host/SC-1/$TC
<you should see your trace hit now>
#-- stop the session
lttng stop $TC
lttng destroy $TC
#-- Convert what your session has captured:
babeltrace /tmp/$TC
Hope it helps,
Tan
From: Anette Schött [mailto:[email protected]]
Sent: February-19-14 8:55 AM
To: [email protected]
Subject: [lttng-dev] Live streaming question (lttng 2.4.0.rc4)
Hi,
I am trying to do live streaming via the lttng-relayd and babeltrace (lttng
2.4.0.rc4). I am running an emulator where
I want to both generate the user-space tracepoints and view them live on the
same host (hope this is a valid use case).
I do the following:
# lttng-relayd -d -v -L net://localhost:5344
DEBUG3 [1516/1516]: URI string: net://localhost:5344 (in uri_parse() at
uri.c:291)
DEBUG3 [1516/1516]: URI dtype: 1, proto: 1, host: localhost, subdir: , ctrl:
5344, data: 0 (in uri_parse() at uri.c:505)
DEBUG3 [1516/1516]: URI string: tcp://0.0.0.0:5342 (in uri_parse() at uri.c:291)
DEBUG3 [1516/1516]: URI dtype: 1, proto: 1, host: 0.0.0.0, subdir: , ctrl:
5342, data: 0 (in uri_parse() at uri.c:505)
DEBUG3 [1516/1516]: URI string: tcp://0.0.0.0:5343 (in uri_parse() at uri.c:291)
DEBUG3 [1516/1516]: URI dtype: 1, proto: 1, host: 0.0.0.0, subdir: , ctrl:
5343, data: 0 (in uri_parse() at uri.c:505)
DEBUG1 [1516/1516]: Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT
(in set_signal_handler() at main.c:435)
# lttng create s1 --live 200000 -U net://localhost:5344
Session s1 created.
Traces will be written in net://localhost:5344
# lttng enable-channel ch1 -u
ERROR [834/838]: recvmsg inet: Connection reset by peer (in
lttcomm_recvmsg_inet_sock() at inet.c:376)
Error: Channel ch1: Relay daemon not compatible (session s1)
Warning: Some command(s) went wrong
As all command are executed on the same host, why compatibility issues?
What commands shall I use to set up a live streaming?
Regards
Anette
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