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 1.1.1.1 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