[PATCH v5 11/11] git: add performance tracing for git's main() function to debug scripts

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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@xxxxxxx>
---
 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 0551509..9fc3921 100644
--- a/trace.c
+++ b/trace.c
@@ -395,3 +395,25 @@ 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 9687563..a51e731 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
 
-- 
1.9.2.msysgit.0.501.gaeecf09

--
To unsubscribe from this list: send the line "unsubscribe git" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Kernel Development]     [Gcc Help]     [IETF Annouce]     [DCCP]     [Netdev]     [Networking]     [Security]     [V4L]     [Bugtraq]     [Yosemite]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux SCSI]     [Fedora Users]