NAME

xrprof - profile R programs

SYNOPSIS

xrprof [-h] [-m] [-F FREQ] [-d DURATION] [-o FILE] -p PID

A sampling profiler for R(1) programs. xrprof writes to standard output the Rprof.out format widely used by existing R-based tools.

Malformed arguments will fall back on the defaults, if possible.

-h: Print usage and exit.
-p PID: Specify the pid of the target R program.
-F FREQ: Set the sampling frequency, in Hertz. The default is 1 Hz, i.e. one sample per second, and the maximum is 1000 Hz (though far fewer samples are usually required).
-d DURATION: Set the duration for xrprof to take samples before exiting (provided the target program runs that long). The default is to last up to one hour.
-o FILE: Write output to FILE instead of standard output.
-m: Run in “mixed mode”, where samples are drawn from both the R-level and native C/C++ stacks and collated together.

Sample from an existing R program for 5 seconds at a useful frequency:



    $ xrprof -F 50 -d 5 -p `pidof R`

Start a new R program in the background and then start the profiler, writing samples to the file Rprof.out in the current directory:



    $ Rscript myprogram.R &


    $ xrprof -F 50 -p $! > Rprof.out

xrprof was written by Aaron Jacobs.