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Re: [tracecompass-dev] Beginner questions for tracecompass (navigation, filtering, working with large datasets)
  • From: Aprameya Rao <Aprameya.Rao@xxxxxxxxxxxxx>
  • Date: Wed, 16 Feb 2022 17:21:40 +0000
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  • Thread-topic: Beginner questions for tracecompass (navigation, filtering, working with large datasets)
Thank you. Let me give these a shot. 
From: tracecompass-dev <tracecompass-dev-bounces@xxxxxxxxxxx> on behalf of Aprameya Rao via tracecompass-dev <tracecompass-dev@xxxxxxxxxxx>
Sent: Wednesday, February 16, 2022 2:35:21 PM
To: tracecompass-dev@xxxxxxxxxxx <tracecompass-dev@xxxxxxxxxxx>
Cc: Aprameya Rao <Aprameya.Rao@xxxxxxxxxxxxx>
Subject: [EXTERNAL] [tracecompass-dev] Beginner questions for tracecompass (navigation, filtering, working with large datasets)
 

Hi

 

I’m just getting started with tracecompass and large files. I have opened up a CTF trace with around 60 million events spanning about two hours and 5-6 GiB and have some basic questions. My traces are stored in multiple files in different folders and I’ve added them all to a project. I’ve also created an experiment covering all traces.

 

1. How do I navigate to a particular timestamp? Lets say my traces are spread over two hours from 02:00:00 to 04:00:00. How do I tell the events view to go to a specific timestamp (say 03:30:00) and start rendering traces from there?

2. It seems that applying a filter starts from the very first event as opposed to the timestamp of the current event and downward. Is this correct? If so, how can I make it start from the current time and go down as opposed to moving the cursor to the start of the experiment and then applying the filter?

3. Are there tips and tricks for working with large amounts of traces? Are there specific aspects of the CTF format that if implemented help tracecompass do better?

4. I notice that lttng creates an index file for some of its traces. Does tracecompass use this file?

 

Thanks

Aprameya

 

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