Weitere ähnliche Inhalte Ähnlich wie Dynamic Tracing of your AMP web site (20) Kürzlich hochgeladen (20) Dynamic Tracing of your AMP web site9. Does a fast trap into Dtrace probe to minimize performance impact. 10. A simple Dtrace script #!/usr/sbin/dtrace -qs syscall:::entry { @num[probefunc] = count() } 11. Dtrace format ● provider:module:function:name ● -P provider ● -m module ● -f function ● -n name ● -s script ● -p pid ● -c run command ● -l list ● -v verbose 16. MySQL / PHP Dtrace probes are enabled within engine 21. Sample MySQL D Script #!/usr/sbin/dtrace -qs dtrace:::BEGIN { printf("%-40s %2s %-9s", "Query", "QC", "Time(ms)"); } mysql*:::query-start { self->query = copyinstr(arg0); self->querystart = timestamp; self->qc = 0; } mysql*:::query-cache-hit { self->qc = 1; } mysql*:::query-cache-miss { self->qc = 0; } mysql*:::query-done { printf("%-40s %-2s %-9d",self->query,(self->qc ? "Y" : "N"), (timestamp - self->querystart) / 1000000); } 22. Sample MySQL D Script Output select * from t1 order by i limit 10 N 1072 set global query_cache_size=262144 N 0 select * from t1 order by i limit 10 N 781 select * from t1 order by i limit 10 Y 0 select * from t1 order by i limit 30 Y 0 select * from t1 order by i limit 10 Y 0 select * from t1 order by i limit 10 Y 0 23. MySQL Dtrace probes connection-start(id, user, hostname) connection-done(status, id) command-start(id, command_id) command-end(status) query-start(query, id, db, user, host) query-done(status) query-parse-start(query) query-parse-done(status) query-cache-hit(query, row) query-cache-miss(query) query-exec-start(query, id, db, host, exec_type) query-exec-done(status) insert/update/delete-row-start(db, table, status) insert/update/delete-row-done(db, table, status) select/insert/update/multi-update-start(query, status, rows, rowsmatched, rowschanged) select/insert/update/multi-update-done(query, status, rows, rowsmatched, rowschanged) 24. Sample PHP D Script php*:::compile-file-entry /arg0 != NULL/ { self->compile_file = copyinstr(arg0); self->compile_start_time = timestamp; } php*:::compile-file-return /self->compile_file == copyinstr(arg0)/ { self->compile_elapsed = ((timestamp - self->compile_start_time) / 1000000); @compile_time[self->compile_file] = quantize(self->compile_elapsed); self->compile_file = 0; self->compile_file_translated = 0; self->compile_start_time = 0; } tick-60s { printf("Exclusive compile elapsed times,"); printa(" %s, %@d", @compile_time); } 25. PHP Dtrace probes request-startup(request-file, request-uri, request-method) request-end(request-file, request-uri, request-method) compile-file-entry(compile-file, compile-file-translated) compile-file-return(compile-file, compile-file-translated) function-entry(function-name, request-file, lineno, classname, scope) function-end(function-name, request-file, lineno, classname, scope) execute-entry(request-file, lineno) execute-end(request-file, lineno) error(errormsg, request-file, lineno) execption-thrown(classname) exception-catched(classname) 30. Apache Dtrace Probes accept_connection(uint*) log_request(uint*, char*, char*) receive_request (uint*) create_child() check_user_credentials(uint*) check_access(uint*) check_authorization(uint*)