Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved.

CDDL HEADER START

The contents of this file are subject to the terms of the
Common Development and Distribution License (the "License").
You may not use this file except in compliance with the License.

You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
or http://www.opensolaris.org/os/licensing.
See the License for the specific language governing permissions
and limitations under the License.

When distributing Covered Code, include this CDDL HEADER in each
file and include the License file at usr/src/OPENSOLARIS.LICENSE.
If applicable, add the following below this CDDL HEADER, with the
fields enclosed by brackets "[]" replaced with your own identifying
information: Portions Copyright [yyyy] [name of copyright owner]

CDDL HEADER END

perfcnt - trace the amount of time spent in each function call perfcnt [ -f bindfromlist ] [ t bindtolist ] [ -l perfcntlib ] executable [executable arguments ...]

SUNWosdem

perfcnt executes the specified command and tracks the amount of time that is spent in each procedure call. perfcnt traces all of the procedure calls that occur between dynamic objects via the Procedure Linkage Table, so only those procedure calls which are bound to the Procedure Linkage Table will be traced.

perfcnt has the limitation that it does not work with a threaded program nor any programs which use procedures which are dependent upon the stack frame. See NOTES below

10 -f " bindfromlist" A colon separated list of libraries that are to be traced. Only calls from these libraries will be traced. The default is to trace all calls.

-t " bindtolist" A colon separated list of libraries taht are to be traced. Only calls to these libraries will be traced. The default is to trace all calls.

-l " perfcntlib" specify an alternate perfcnt.so Link-Auditing library to use.

The example tracks the usage of the libelf.so.1 library when performing a nm.

% perfcnt -t/usr/lib/libelf.so.1 nm /usr/lib/libc.so.1
/usr/lib/libc.so.1:

[Index] Value Size Type Bind Other Shndx Name

[457] | 0| 0|NOTY |LOCL |0 |UNDEF |
[2] | 148| 0|SECT |LOCL |0 |1 |
[3] | 15232| 0|SECT |LOCL |0 |2 |
[4] | 45120| 0|SECT |LOCL |0 |3 |
[5] | 64024| 0|SECT |LOCL |0 |4 |
\.\.\.
[1893] | 347660| 88|FUNC |LOCL |0 |12 |ypstub_perror
[1895] | 347280| 380|FUNC |LOCL |0 |12 |ypstub_sperror
[714] | 663472| 8|OBJT |LOCL |0 |22 |zero


Perf Counts for: nm

 SYMBOL c_count tim avg. tim tot. %
---------------------------------------------------------------------
 elf_getscn 1 4.03 4.03 0.01%
 elf_kind 1 4.36 4.36 0.01%
 _elf32_fsize 7 50.80 7.26 0.09%
 _elf32_xlatetom 6 67.47 11.24 0.11%
 elf_version 1 72.50 72.50 0.12%
 elf32_getshdr 33 77.42 2.35 0.13%
 elf_nextscn 33 83.36 2.53 0.14%
 elf_end 1 131.91 131.91 0.22%
 elf_getdata 2 138.74 69.37 0.23%
 elf_begin 1 171.74 171.74 0.29%
 elf32_getehdr 1 214.81 214.81 0.36%
 _elf_getscn 4254 9755.89 2.29 16.38%
 elf_strptr 4254 48784.97 11.47 81.91%
---------------------------------------------------------------------
 Total Time: 59557.98

The perfcnt command is a demonstration of the Link-Auditing interface of the run-time linker (which is documented in .TZ LLM \), and it is not useful in all environments. This program will not work with a threaded application and should not be used with one. Also, in order to track the time spent in a procedure both the entry and exit of the procedure must be tracked. Because this causes an additional stack frame to be created for each procedure call it is not compatible with all library routines. More details on this can be found in the Link-Auditing section of .TZ LLM ld.so.1 (1)

.TZ LLM