[Jack-Devel] How to profile jack cpu load?

Tim termtech at rogers.com
Sun Jul 8 23:10:38 CEST 2018

>  When I started jackd with -v option, there no message "Engine 
profiling activated" in the standard output.
> When I set the brakpoint at JackEngineProfiling::JackEngineProfiling() with a debugger, this breakpoint is never > >reached.

Hi, I'd like to report that out of curiosity, I just built
  and installed jack2-1.9.12, here on openSUSE Tumbleweed,
  with the profiling enabled with --profile configure flag.

Here's what I get:

/usr/local/bin/jackd -P30 -dalsa -r44100 -p256 -n2 -Xseq -D 
-Chw:M1010LT,0 '-Phw:M1010LT,0'
jackdmp 1.9.12
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2017 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 30
self-connect-mode is "Don't restrict self connect requests"

Engine profiling activated, beware 197 MBytes are needed to record 
profiling points...

creating alsa driver ... hw:M1010LT,0
configuring for 44100Hz, period = 256 frames (5.8 ms), buffer = 2 periods
ALSA: final selected sample format for capture: 32bit integer little-endian
ALSA: use 2 periods for capture
ALSA: final selected sample format for playback: 32bit integer little-endian
ALSA: use 2 periods for playback
port created: Midi-Through:midi/playback_1
port created: Midi-Through:midi/capture_1
port created: M-Audio-Delta-1010LT:midi/playback_1
port created: M-Audio-Delta-1010LT:midi/capture_1
Jack main caught signal 15
port deleted: M-Audio-Delta-1010LT:midi/playback_1
port deleted: Midi-Through:midi/playback_1
port deleted: M-Audio-Delta-1010LT:midi/capture_1
port deleted: Midi-Through:midi/capture_1
Write server and clients timing data...
JackEngineProfiling::Save cannot open JackEngineProfiling.log file
JackEngineProfiling::Save cannot open Timing1.plot file
JackEngineProfiling::Save cannot open Timing2.plot file
JackEngineProfiling::Save cannot open Timings.html file
JackEngineProfiling::Save cannot open generate_timings file
*** Killed process ***

Note you must stop the server before the profiling info can be
  gathered and written, as shown in that .pdf link someone posted.
I'm not sure if it could not write because I ungracefully
  killed it, or it's simply a permissions/location thing,
  probably the latter, I have not looked into it any further

The MusE sequencer project.

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