Re: ltt usage issue:

See comments below,

* Pradeep Kumar ([email protected]) wrote:
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> Hi all
> 
> I am new to lttng/ltt. I am having problems using lttng with LTT viewer.
> since there is no lttng-user forum, I am posting it here. I apologize
> for the same. Someone please respond. The version details of lttng,
> lttv, ltt-usertrace, os etc are given below:
> 
> problem:
> ===========
> I am simply unable to use ltt-usertrace. I tried to follow steps listed
> in Quickstart guide. But I am getting nowhere. I am unable to produce trace
> 
> ** ERROR **: Trace /tmp/trace has no facility tracefile
> aborting...
> /usr/local/bin/lttv: line 15: 26289 Aborted                 $0.real $*
> 
> 
> Steps followed:
> ================
> 1. started the trace as follows:
> [pradeep@fd0005 ltt-usertrace-0.32]$ sudo lttctl -n trace -d -l
> /mnt/debugfs/ltt -t /tmp/trace
> Linux Trace Toolkit Trace Control 0.40-26042007
> 

What is this Linux Trace Toolkit Trace Control 0.40-26042007 ?

The
http://ltt.polymtl.ca/svn/ltt/branches/poly/doc/developer/lttng-lttv-compatibility.html
page states that ltt-control 0.30 should be used with your 2.6.18 kernel
with LTTng patch 0.6.41.

> Controlling trace : trace
> 
> Linux Trace Toolkit Trace Daemon 0.40-26042007
> 
> Reading from debugfs directory : /mnt/debugfs/ltt/trace
> Writing to trace directory : /tmp/trace
> 
> Creating supplementary trace files
> Appending facility file list.xml
> Appending facility file locking.xml
> Appending facility file kernel_arch_powerpc.xml
> Appending facility file stack_arch_x86_64.xml
> Appending facility file kernel_arch_i386.xml
> Appending facility file kernel_arch_arm.xml
> Appending facility file kernel_arch_x86_64.xml
> Appending facility file kernel.xml
> Appending facility file kernel_arch_mips.xml
> Appending facility file kernel_arch_ppc.xml
> Appending facility file fs.xml
> Appending facility file net.xml
> Appending facility file core.xml
> Appending facility file mm.xml
> Appending facility file kernel_arch_c2.xml
> Appending facility file user_generic.xml
> Appending facility file stack_arch_i386.xml
> Appending facility file compact.xml
> Appending facility file xen.xml
> 
> 2. tried to use the sample-printf in the ltt-usertrace and stopped trace
> after a while as follows:
> 
> [pradeep@fd0005 ltt-usertrace-0.32]$ sudo ./sample-printf

You should use ltt-usertrace-0.21 with LTTng 0.6.41. Please refer to the
same page "http://ltt.polymtl.ca > LTTng & LTTV Versions Compatibility".

> Will trace a printf of an incrementing counter.
> Abort with CTRL-C.
> No file is created with this example : it logs through a kernel
> system call. See the LTTng lttctl command to start tracing.
> 
> [pradeep@fd0005 ltt-usertrace-0.32]$ sudo lttctl -n trace -R
> Linux Trace Toolkit Trace Control 0.40-26042007
> 
> Controlling trace : trace
> 
> 3. when I tried to view the trace with textDump as follows, no trace was
> produced
> 
> [pradeep@fd0005 ltt-usertrace-0.32]$ sudo lttv -m textDump -t /tmp/trace
> The input data file /tmp/trace/control/processes_0 does not contain a trace
> The input data file /tmp/trace/control/interrupts_0 does not contain a trace
> The input data file /tmp/trace/control/facilities_0 does not contain a trace
> The input data file /tmp/trace/control/network_0 does not contain a trace
> The input data file /tmp/trace/control/modules_0 does not contain a trace
> The input data file /tmp/trace/cpu_0 does not contain a trace
> 
> ** ERROR **: Trace /tmp/trace has no facility tracefile
> aborting...
> /usr/local/bin/lttv: line 15: 26289 Aborted                 $0.real $*
> [pradeep@fd0005 ltt-usertrace-0.32]$ ls -l /tmp/trace/
> 
> 
> OS and LTTng details
> =====================
> OS version: kernel-2.6.18
> lttng version patch used : patch01-2.6.18-lttng-0.6.41
> lttng-userspace app used: ltt-usertrace-0.32
> trace toolkit viewer used: LinuxTraceToolkitViewer-0.8.82-09042007

You should use LTTV 0.8.72 with this kernel.

Mathieu

> 
> 
> dmesg output
> ============
> [ 1674.624585] ltt-control init
> [ 1680.208849] ltt-control ltt_control_input
> [ 1680.208855] ltt_control : trace trace
> [ 1680.208859] Creating trace trace
> [ 1680.243713] ltt-control ltt_control_input
> [ 1680.243719] ltt_control : trace trace
> [ 1680.243723] Start tracing trace
> [ 1680.243728] Dumping facility core
> [ 1680.243734] Dumping facility locking
> [ 1680.243740] Dumping facility statedump
> [ 1680.243744] ltt_statedump_start
> [ 1680.243746] do_ltt_statedump
> [ 1680.255381] trace_statedump_statedump_end
> [ 1728.012699] ltt-control ltt_control_input
> [ 1728.012705] ltt_control : trace trace
> [ 1728.012708] Stop tracing trace
> [ 1728.043057] ltt-control ltt_control_input
> [ 1728.043063] ltt_control : trace trace
> [ 1728.043067] Destroying trace trace
> [ 1728.072880] finish for cpu 0 , d85b786c
> [ 1728.072885] finish for cpu 0 , ea764720
> [ 1728.072888] finish for cpu 0 , df0fcd68
> [ 1728.072890] finish for cpu 0 , eb396508
> [ 1728.072893] finish for cpu 0 , f5a69c1c
> [ 1728.072896] finish for cpu 0 , ea3ba37c
> [ 1728.072917] LTT : unread channel facilities_ offset is 65536 and
> cons_off : 0 (cpu 0)
> [ 1728.072921] LTT : facilities_ : commit count : 65536, subbuf size 65536
> [ 1728.072957] LTT : unread channel interrupts_ offset is 65536 and
> cons_off : 0 (cpu 0)
> [ 1728.072961] LTT : interrupts_ : commit count : 65536, subbuf size 65536
> [ 1728.072991] LTT : unread channel processes_ offset is 262144 and
> cons_off : 0 (cpu 0)
> [ 1728.072995] LTT : processes_ : commit count : 262144, subbuf size 262144
> [ 1728.073057] LTT : unread channel modules_ offset is 65536 and
> cons_off : 0 (cpu 0)
> [ 1728.073062] LTT : modules_ : commit count : 65536, subbuf size 65536
> [ 1728.073089] LTT : unread channel cpu_ offset is 1048576 and cons_off
> : 0 (cpu 0)
> [ 1728.073093] LTT : cpu_ : commit count : 1048576, subbuf size 1048576
> [ 1728.073239] LTT : unread channel network_ offset is 65536 and
> cons_off : 0 (cpu 0)
> [ 1728.073243] LTT : network_ : commit count : 65536, subbuf size 65536
> 
> 
> 
> I would really appreciate any help/pointers in this regard
> 
> Best Regards
> Pradeep
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-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
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