Visualization

[wlandau]

I have been struggling to profile drake for a long time because of r-lib/profvis#104, and this weekend, profile helped me really break through: ropensci/drake#647, https://github.com/wlandau/drake-examples/tree/master/overhead. A big piece of the solution was pprof's ability to spin up a Jupyter-like web server to display interactive visuals: pprof -http=0.0.0.0:8080 output_from_write_pprof.proto.

Do you think a front-end to this functionality would fall in scope for profile or maybe another package in the r-prof org? In my opinion, it could be a really useful high-performance alternative to profvis.

[krlmlr]

Thanks. The README for jointprof, https://r-prof.github.io/jointprof/, has an example that uses system2() to achieve this. Are you suggesting to add a wrapper around the shell commands?

[wlandau]

That README is really helpful. When I last tried jointprof for an Rcpp-powered project at work, it was having trouble combining the R results with the C results, but that problem appears to be fixed now.

I think a wrapper around system2() would add convenience, draw more attention to the interactive visuals, and educate users on how to set the hostname/IP and port. Admittedly, I struggled with this last bit because I was working through an ssh session and had to use a different computer to run the browser. Jupyter notebooks are nice because they give you a link that just works, and pprof by itself is not as helpful.

[wlandau]

Just realized find_pprof() will come in handy, so maybe jointprof is a better place for the implementation. Moving to r-prof/jointprof#35.

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