[lttng-dev] Best way to analyze CTF files

[Boisvert, Sebastien]

Bonjour,

First, thank you for LTTng-UST. This is very useful and convenient.

I just got started today using LTTng (LTTng-UST) for tracing a HPC application 
that I am working on (I am a postdoc). I am impressed by how easy LTTng is to use it.

In my system, an actor message is represented by a pair
<message_actor_source, message_number>.

I want to list all messages that have a high delivery time (message:actor_receive - message:actor_send).

I am doing this to get the messages of one actor (actor 1000019):

[boisvert at bigmem biosal]$ babeltrace ~/lttng-traces/auto-20141017-181240|grep "message_source_actor = 1000019"  > actor_1000019

Then, I can look at one message with (message <1000019, 14>):

[boisvert at bigmem biosal]$ grep "message_number = 14," actor_1000019
[18:12:43.647017211] (+0.000005110) bigmem.knoxville.kbase.us message:actor_send: { cpu_id = 30 }, { message_number = 14, message_action = 31592, message_count = 8, message_source_actor = 1000019, message_destination_actor = 1000059, message_source_node = -1, message_destination_node = -1 }
[18:12:43.647025249] (+0.000002860) bigmem.knoxville.kbase.us message:actor_receive: { cpu_id = 49 }, { message_number = 14, message_action = 31592, message_count = 8, message_source_actor = 1000019, message_destination_actor = 1000059, message_source_node = 3, message_destination_node = 3 }

If I substract the times:

irb(main):003:0> (43.647025249-43.647017211)*10**9
=> 8038.00000426236

This message (<1000019, 14>) required 8038 ns for the delivery. This one is fine.


So basically my question is:

Is there an easy way to analyze these tracepoint files ?