Re: Generating flame graphs on OSv

[Tomasz Grabiec]

On Tue, Jun 27, 2017 at 6:20 PM, Waldek Kozaczuk 
wrote:

> I was wondering if it should be possible to generate so called "flame
> graphs" (https://medium.com/netflix-techblog/java-in-flames-e763b3d32166)
> on OSv to visualize its performance characteristic. I have a sense that it
> might not be that difficult but I am missing some hints. I might be all
> wrong as well :-)
>
> It looks like OSv comes with its own trace tool (
> https://github.com/cloudius-systems/osv/wiki/Trace-analysis-using-trace.py)
> that operates on tracefile but I am not sure if the format is in any way
> compatible with Linux perf tool.
>

It's not compatible, but it shouldn't be hard to write a trace.py command
which generates a .stacks file out of the samples tree, which can be then
understood by the FlameGraph tools.

I've done this for seastar's heap profiler:

https://github.com/scylladb/scylla/wiki/Seastar-heap-profiler#generating-flamegraphs

Code which generates the .stacks file:

https://github.com/scylladb/scylla/blob/master/scylla-gdb.py#L397

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Generating flame graphs on OSv

[Waldek Kozaczuk]

I was wondering if it should be possible to generate so called "flame 
graphs" (https://medium.com/netflix-techblog/java-in-flames-e763b3d32166) 
on OSv to visualize its performance characteristic. I have a sense that it 
might not be that difficult but I am missing some hints. I might be all 
wrong as well :-)

It looks like OSv comes with its own trace tool 
(https://github.com/cloudius-systems/osv/wiki/Trace-analysis-using-trace.py) 
that operates on tracefile but I am not sure if the format is in any way 
compatible with Linux perf tool. 

Regards,
Waldek

PS. Attaching what I found about creating flame graphs for MirageOS - 
http://www.brendangregg.com/blog/2016-01-27/unikernel-profiling-from-dom0.html


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