Bump... Amit Margalit IBM XIV - Storage Reinvented XIV-NAS Development Team Tel. 03-689-7774 Fax. 03-689-7230
From: Amit Margalit/Israel/IBM@IBMIL To: lttng-dev <[email protected]> Date: 04/02/2014 01:57 PM Subject: [lttng-dev] Problem running lttng enable-channel shortly after lttng create Hello, I keep getting the following error from lttng enable-channel: libust[2984/2986]: Error: Timed out waiting for lttng-sessiond (in lttng_ust_init() at lttng-ust-comm.c:1444) The scenario is quite simple - during boot of the system, we create a session, enable a channel, etc., like this: # /usr/bin/lttng-sessiond --no-kernel -b Warning: No tracing group detected # /usr/bin/lttng create nextra -o /local/traces/lttng/20140402123725 Session nextra created. Traces will be written in /local/traces/lttng/20140402123725 # /usr/bin/lttng enable-channel channel0 -u --tracefile-size 67108864 --tracefile-count 40 --buffers-uid --switch-timer 1000000 --num-subbuf 16 --subbuf-size 262144 libust[2984/2986]: Error: Timed out waiting for lttng-sessiond (in lttng_ust_init() at lttng-ust-comm.c:1444) Warning: No tracing group detected The PID 2984 belongs to the lttng-consumerd. At that point in time I see the following in syslog: 2014/04/02 12:38:03.370576 kernel error nextra-6663235-module-1 [ 56.376155] proc lttng-sessiond with pid 632 goes to delayed retry in epoll_wait(): start jiffies 4294904844, stop jiffies=4294906390 (+1546), expected final stop jiffies=9223372041149680651 (+9223372036854775807), next stop jiffies=9223372041149682197 (+9223372036854775807) 2014/04/02 12:38:03.399245 kernel error nextra-6663235-module-1 [ 56.405166] proc lttng-sessiond with pid 632 goes to delayed retry in epoll_wait(): start jiffies 4294904844, stop jiffies=4294906397 (+1553), expected final stop jiffies=9223372041149680651 (+9223372036854775807), next stop jiffies=9223372041149682204 (+9223372036854775807) 2014/04/02 12:38:03.405700 kernel error nextra-6663235-module-1 [ 56.411791] proc lttng-sessiond with pid 632 goes to delayed retry in epoll_wait(): start jiffies 4294904844, stop jiffies=4294906398 (+1554), expected final stop jiffies=9223372041149680651 (+9223372036854775807), next stop jiffies=9223372041149682205 (+9223372036854775807) And finally, the command succeeds: UST channel channel0 enabled for session nextra My guess is that the boot sequence is loading some traced application before the channel is enabled, and the consumerd is started, which under heavy system load (exists during initial boot time) times out waiting for the sessiond. If that was the case, I could try to increase the timeout time, but that also delays my booting, which I cannot afford to do. Suggestions? Amit Margalit IBM XIV - Storage Reinvented XIV-NAS Development Team Tel. 03-689-7774 Fax. 03-689-7230_______________________________________________ lttng-dev mailing list [email protected] http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
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