Re: Beginner question about KernelShark

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On Tue, 30 Apr 2024 13:01:47 +0100
David Aldrich <david.aldrich.ntml@xxxxxxxxx> wrote:

> Hi, I am new to trace and KernelShark. We are developing a real-time
> application on Ubuntu 22.04. We see some jitter in some tasks and we
> need a tool to help us analyse what tasks are being scheduled on a
> specific cpu. I assume that trace and KernelShark can help us with
> this. Am I correct?

For jitter, I don't usually use kernelshark but just trace-cmd itself.
Although, if the jitter is caused by many applications, then kernelshark
can be useful.

> A complication is that we are running the application on a server, not
> a desktop system. In fact we have no desktop Linux systems available.
> I am wondering if we could capture the trace data on the server and
> then analyse it offline using KernelShark running on Windows Subsystem
> for Linux (WSL) on a Windows laptop? Do you think that is feasible?

Yes, kernelshark reads the trace-cmd "trace.dat" file that it creates, and
if you have a Linux system (VM on Windows) then you can read that trace.dat
file from kernelshark there.

> Is KernelShark available as a package, or must it be built by the user?

Yes, it's available as a package on Ubuntu (and other distros).

> Any tips on how to capture the trace data and analyse it with
> KernelShark would be appreciated.

Well, I usually use just trace-cmd. I gave a talk about analyzing
cyclictest jitter with using trace-cmd as well as the libtracefs libraries.

-- Steve

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