[PATCH v6 11/11] git: add performance tracing for git's main() function to debug scripts
- From
Karsten Blees <karsten.blees@gmail.com>
- Date
- Jun 20, 2014, 21:10 UTC
- Message-ID
- <53A4A352.2050308@gmail.com>
- In-Reply-To
- <53A4A195.1070502@gmail.com>
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: Karsten Blees <blees@dcon.de> Signed-off-by: Junio C Hamano <gitster@pobox.com> --- git.c | 2 ++ trace.c | 22 ++++++++++++++++++++++ trace.h | 1 + 3 files changed, 25 insertions(+)
diff --git a/git.c b/git.c index 7780572..d4daeb8 100644 --- a/git.c +++ b/git.c @@ -568,6 +568,8 @@ int main(int argc, char **av) git_setup_gettext(); + trace_command_performance(argv); + /* * "git-xxxx" is the same as "git xxxx", but we obviously: * diff --git a/trace.c b/trace.c index 65cd887..dcd2685 100644 --- a/trace.c +++ b/trace.c @@ -404,3 +404,25 @@ inline uint64_t getnanotime(void) return now; } } + +static uint64_t command_start_time; +static struct strbuf command_line = STRBUF_INIT; + +static void print_command_performance_atexit(void) +{ + trace_performance_since(command_start_time, "git command:%s", + command_line.buf); +} + +void trace_command_performance(const char **argv) +{ + if (!trace_want(GIT_TRACE_PERFORMANCE)) + return; + + if (!command_start_time) + atexit(print_command_performance_atexit); + + strbuf_reset(&command_line); + sq_quote_argv(&command_line, argv, 0); + command_start_time = getnanotime(); +} diff --git a/trace.h b/trace.h index f491471..5d1f174 100644 --- a/trace.h +++ b/trace.h @@ -7,6 +7,7 @@ extern void trace_repo_setup(const char *prefix); extern int trace_want(const char *key); extern uint64_t getnanotime(void); +extern void trace_command_performance(const char **argv); #ifndef HAVE_VARIADIC_MACROS
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