• Karsten Blees's avatar
    git: add performance tracing for git's main() function to debug scripts · 578da039
    Karsten Blees authored
    Use trace_performance to measure and print execution time and command line
    arguments of the entire main() function. In constrast to the shell's 'time'
    utility, which measures total time of the parent process, this logs all
    involved git commands recursively. This is particularly useful to debug
    performance issues of scripted commands (i.e. which git commands were
    called with which parameters, and how long did they execute).
    
    Due to git's deliberate use of exit(), the implementation uses an atexit
    routine rather than just adding trace_performance_since() at the end of
    main().
    
    Usage example: > GIT_TRACE_PERFORMANCE=~/git-trace.log git stash list
    
    Creates a log file like this:
    23:57:38.638765 trace.c:405 performance: 0.000310107 s: git command: 'git' 'rev-parse' '--git-dir'
    23:57:38.644387 trace.c:405 performance: 0.000261759 s: git command: 'git' 'rev-parse' '--show-toplevel'
    23:57:38.646207 trace.c:405 performance: 0.000304468 s: git command: 'git' 'config' '--get-colorbool' 'color.interactive'
    23:57:38.648491 trace.c:405 performance: 0.000241667 s: git command: 'git' 'config' '--get-color' 'color.interactive.help' 'red bold'
    23:57:38.650465 trace.c:405 performance: 0.000243063 s: git command: 'git' 'config' '--get-color' '' 'reset'
    23:57:38.654850 trace.c:405 performance: 0.025126313 s: git command: 'git' 'stash' 'list'
    Signed-off-by: default avatarKarsten Blees <blees@dcon.de>
    Signed-off-by: default avatarJunio C Hamano <gitster@pobox.com>
    578da039
trace.c 10.3 KB