elisp profiling

Description

The following hydra allows easy use of emacs' built-in profiler.el for profiling the performance of elisp. Note that it depends on the excellent magnars/s.el and magnars/s.el libraries, which you probably already have installed because so many other packages also depend on them.

Alternative version

Instead of the version below, you may prefer to use the version at https://github.com/aspiers/emacs/blob/master/.emacs.d/init.d/as-profiling.el for any of the following reasons:

• It may be updated more regularly than this wiki page. (PRs are welcome!)
• It is conveniently wrapped in a use-package sexp.
• It adds a . binding to profiler-report-mode-map for conveniently stopping the profiler while viewing a report.

Hydra

  (defun profiler-running-modes ()
    (let ((running-modes
           (-non-nil (list (if (profiler-cpu-running-p) "cpu")
                           (if (profiler-memory-running-p) "mem")))))
      (if running-modes
          (s-join "+" running-modes)
        "stopped")))

  (defhydra hydra-profiler
    (:color red)
    "
elisp profiling (currently %s(profiler-running-modes))

"
    ("s" profiler-start "start (prompt for mode)" :column "Start / stop")
    ("c" (profiler-start 'cpu) "start CPU profiling")
    ("m" (profiler-start 'mem) "start memory profiling")
    ("b" (profiler-start 'cpu+mem) "start both CPU+memory profiling")
    ("." profiler-stop "stop")
    ("R" profiler-reset "Reset")
    ("q" nil "Cancel")
    ("r" profiler-report "report" :column "Reporting" :color blue)
    ("f" profiler-find-profile "find profile")
    ("4" profiler-find-profile-other-window "find profile other window")
    ("5" profiler-find-profile-other-frame  "find profile other frame"))