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Tuesday, December 13. 2005DTrace: observing PHP, part 2
Your next step in observing PHP with DTrace could easily be the following script. It times how much time (in nanoseconds) each Apache process has spent running a particular PHP function.
This script generates a table of Apache PIDs and PHP scripts started within, and later you'll get a table of all the functions with PIDs which ran them and the time spent. You can download this script here: php-scripts-timer.d CODE: #!/usr/sbin/dtrace -s #pragma D option quiet BEGIN { printf("php scripts timer started\n"); } :dtrace.so::function-entry / copyinstr(arg0) == "" && name[pid,copyinstr(arg1)] != 1 / { printf("%d -> %-30s\n", pid, copyinstr(arg1)); name[pid,copyinstr(arg1)] = 1; } :dtrace.so::function-entry / copyinstr(arg0) != "" / { self->ts = timestamp; } :dtrace.so::function-return / copyinstr(arg0) != "" / { self->elapsed = timestamp - self->ts; @time[pid, copyinstr(arg0)] = sum(self->elapsed); } END { printf("<------ php scripts timer finished"); printf("\n%10s %40s %14s\n", "PID", "PHP function", "Time elapsed"); printa("%10d %40s %14@u\n", @time); } A typical result of running this script while opening some PHP pages served by your Apache will look like this: CODE: php scripts timer started
223074 -> /export/www/nightly/pma/left.php 223071 -> /export/www/nightly/pma/main.php 223074 -> /export/www/nightly/pma/css/phpmyadmin.css.php 223071 -> /export/www/nightly/pma/css/phpmyadmin.css.php <------ php scripts timer finished PID PHP function Time elapsed 223074 ob_get_level 22280 223074 get_cfg_var 32678 223074 mysql_get_client_info 32705 223074 strrpos 39160 223074 PMA_auth_set_user 39178 223071 get_magic_quotes_gpc 39478 223071 ob_get_level 43673 223071 addslashes 54847 223074 strpos 56869 223071 basename 61874 223071 PMA_reloadNavigation 63588 223071 mysql_get_client_info 64570 223071 get_cfg_var 64592 223071 ereg_replace 65993 223074 get_magic_quotes_gpc 67738 ... 234950 main 84254684 238255 main 105016748 238255 substr 153752861 238255 mysql_query 192585647 238255 PMA_DBI_try_query 195113800 234950 PMA_DBI_query 220108343 234950 mysql_query 276732073 234950 PMA_DBI_try_query 280801228 Trackbacks
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Добрый день.
Очень полезная информация, особенно для разработчиков программного обеспечения.
Спасибо, Егор!
Учитывая простоту исходного кода для модуля отладки PHP с помощью DTrace, туда можно добавлять какие угодно функции для личных целей - чем я и займусь в ближайшее время, просто чтобы узнать точно, как это делается. |