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#!/usr/sbin/dtrace -CZs
/*
* py_profile.d - sample stack traces with Python translations using DTrace.
* Written for the Python DTrace provider.
*
* $Id: py_profile.d 19 2007-09-12 07:47:59Z brendan $
*
* USAGE: py_profile.d { -p PID | -c cmd } # hit Ctrl-C to end
*
* This samples stack traces for the process specified. This stack trace
* will cross the Python engine and system libraries, and insert
* translations for Python stack frames where appropriate. This is best
* explained with an example stack frame output,
*
* libpython2.4.so.1.0`PyEval_EvalFrame+0x2fbf
* [ ./func_loop.py:5 (func_c) ]
* libpython2.4.so.1.0`fast_function+0xa8
* libpython2.4.so.1.0`call_function+0xda
* libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
* [ ./func_loop.py:11 (func_b) ]
* libpython2.4.so.1.0`fast_function+0xa8
* libpython2.4.so.1.0`call_function+0xda
* libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
* [ ./func_loop.py:14 (func_a) ]
* libpython2.4.so.1.0`fast_function+0xa8
* libpython2.4.so.1.0`call_function+0xda
* libpython2.4.so.1.0`PyEval_EvalFrame+0xbdf
* [ ./func_loop.py:16 (?) ]
*
* The lines in square brackets are the native Python frames, the rest
* are the Python engine.
*
* COPYRIGHT: Copyright (c) 2007 Brendan Gregg.
*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at Docs/cddl1.txt
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* CDDL HEADER END
*
* 09-Sep-2007 Brendan Gregg Created this.
*/
#pragma D option quiet
#pragma D option jstackstrsize=1024
/*
* Tunables
*/
#define DEPTH 10 /* stack depth, frames */
#define RATE 1001 /* sampling rate, Hertz */
#define TOP 25 /* number of stacks to output */
dtrace:::BEGIN
{
printf("Sampling %d-level stacks at %d Hertz... Hit Ctrl-C to end.\n",
DEPTH, RATE);
}
profile-RATE
/pid == $target/
{
@stacks[jstack(DEPTH)] = count();
}
dtrace:::END
{
trunc(@stacks, TOP);
printf("Top %d most frequently sampled stacks,\n", TOP);
printa(@stacks);
}
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