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py_profile.d revision 1.1 
      1 #!/usr/sbin/dtrace -CZs
      2 /*
      3  * py_profile.d - sample stack traces with Python translations using DTrace.
      4  *                Written for the Python DTrace provider.
      5  *
      6  * $Id: py_profile.d,v 1.1 2015/09/30 22:01:09 christos Exp $
      7  *
      8  * USAGE: py_profile.d { -p PID | -c cmd }	# hit Ctrl-C to end
      9  *
     10  * This samples stack traces for the process specified. This stack trace
     11  * will cross the Python engine and system libraries, and insert
     12  * translations for Python stack frames where appropriate. This is best
     13  * explained with an example stack frame output,
     14  *
     15  *            libpython2.4.so.1.0`PyEval_EvalFrame+0x2fbf
     16  *              [ ./func_loop.py:5 (func_c) ]
     17  *            libpython2.4.so.1.0`fast_function+0xa8
     18  *            libpython2.4.so.1.0`call_function+0xda
     19  *            libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
     20  *              [ ./func_loop.py:11 (func_b) ]
     21  *            libpython2.4.so.1.0`fast_function+0xa8
     22  *            libpython2.4.so.1.0`call_function+0xda
     23  *            libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
     24  *              [ ./func_loop.py:14 (func_a) ]
     25  *            libpython2.4.so.1.0`fast_function+0xa8
     26  *            libpython2.4.so.1.0`call_function+0xda
     27  *            libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
     28  *              [ ./func_loop.py:16 (?) ]
     29  *
     30  * The lines in square brackets are the native Python frames, the rest
     31  * are the Python engine.
     32  *
     33  * COPYRIGHT: Copyright (c) 2007 Brendan Gregg.
     34  *
     35  * CDDL HEADER START
     36  *
     37  *  The contents of this file are subject to the terms of the
     38  *  Common Development and Distribution License, Version 1.0 only
     39  *  (the "License").  You may not use this file except in compliance
     40  *  with the License.
     41  *
     42  *  You can obtain a copy of the license at Docs/cddl1.txt
     43  *  or http://www.opensolaris.org/os/licensing.
     44  *  See the License for the specific language governing permissions
     45  *  and limitations under the License.
     46  *
     47  * CDDL HEADER END
     48  *
     49  * 09-Sep-2007	Brendan Gregg	Created this.
     50  */
     51 
     52 #pragma D option quiet
     53 #pragma D option jstackstrsize=1024
     54 
     55 /*
     56  * Tunables
     57  */
     58 #define DEPTH	10		/* stack depth, frames */
     59 #define RATE	1001		/* sampling rate, Hertz */
     60 #define TOP	25		/* number of stacks to output */
     61 
     62 dtrace:::BEGIN
     63 {
     64 	printf("Sampling %d-level stacks at %d Hertz... Hit Ctrl-C to end.\n",
     65 	    DEPTH, RATE);
     66 }
     67 
     68 profile-RATE
     69 /pid == $target/
     70 {
     71 	@stacks[jstack(DEPTH)] = count();
     72 }
     73 
     74 dtrace:::END
     75 {
     76 	trunc(@stacks, TOP);
     77 	printf("Top %d most frequently sampled stacks,\n", TOP);
     78 	printa(@stacks);
     79 }
     80