[lttng-dev] babletrace2 graph performance considerations

Rocky Dunlap dunlap at ucar.edu
Mon Mar 30 18:34:33 EDT 2020

Each graph would parse the whole stream?  What if I only connect one of the
outputs from the source.ctf.fs?  I would think it would only access that
one stream file.


On Mon, Mar 30, 2020 at 4:27 PM Simon Marchi <simark at simark.ca> wrote:

> On 2020-03-30 1:30 p.m., Rocky Dunlap wrote:
> > In my case I have CTF trace where some analyses can be performed on a
> per-stream basis (no need to mux the streams together).  In this case, I
> was thinking that it would make sense to thread over the streams.  However,
> I think can easily do this at a level above the graph simply by creating
> multiple graphs where each one is handling a single stream.  In my case I
> am thinking this will be mostly I/O bound, so I'm not sure what kind of
> payoff the threads will give.  Overall, I just want to make sure that I am
> not doing anything that would, in the long run, preclude
> threading/concurrency if it is added to the graph model itself.
> Creating multiple graphs and handling a single stream in each would
> work, but each graph would end up reading and parsing the while CTF
> trace, which is not great.
> If you streams are in a data file of their own, you could move them
> to their own directory, each with a copy of the metadata, effectively
> creating one trace for each.  Then create one graph for each trace.
> I can't really tell you right now how to design your components to work
> with a future model where there is concurrency, since that model does
> not exist yet :).
> Simon
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