Thanks for your quick reply. Here is the detailed information: The good2.php is attached. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ grace@grace:~/software/WAutoRepair/experiment/php/php_null$ valgrind --version valgrind-3.7.0 grace@grace:~/software/WAutoRepair/experiment/php/php_null$ uname -a Linux grace 2.6.32-21-generic-pae #32-Ubuntu SMP Fri Apr 16 09:39:35 UTC 2010 i686 GNU/Linux grace@grace:~/software/WAutoRepair/experiment/php/php_null$ /home/grace/software/WAutoRepair/experiment/php/php_null/php-src-5.3/sapi/cli/php --version PHP 5.3.7RC4-dev (cli) (built: May 21 2012 23:48:55) Copyright (c) 1997-2011 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies grace@grace:~/software/WAutoRepair/experiment/php/php_null$ time /home/grace/software/WAutoRepair/experiment/php/php_null/php-src-5.3/sapi/cli/php good2.php 6
real 0m0.009s user 0m0.004s sys 0m0.008s grace@grace:~/software/WAutoRepair/experiment/php/php_null$time valgrind --tool=none -q /home/grace/software/WAutoRepair/experiment/php/php_null/php-src-5.3/sapi/cli/php good2.php 6 real 0m1.086s user 0m1.048s sys 0m0.040s grace@grace:~/software/WAutoRepair/experiment/php/php_null$ time /home/grace/software/WAutoRepair/experiment/php/php_null/php-src-5.3/sapi/cli/php --version PHP 5.3.7RC4-dev (cli) (built: May 21 2012 23:48:55) Copyright (c) 1997-2011 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies real 0m0.008s user 0m0.004s sys 0m0.008s grace@grace:~/software/WAutoRepair/experiment/php/php_null$ time valgrind --tool=none -q /home/grace/software/WAutoRepair/experiment/php/php_null/php-src-5.3/sapi/cli/php --version PHP 5.3.7RC4-dev (cli) (built: May 21 2012 23:48:55) Copyright (c) 1997-2011 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies real 0m0.948s user 0m0.904s sys 0m0.044s ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ If the set of test cases are numerous(e.g. 1000), then the php will incur significantly performance degradation. I am waiting in hope for your insightful advices. Thanks again. 在 2012-06-01 10:40:59，"John Reiser" <jrei...@bitwagon.com> 写道： >On 05/31/2012 07:10 PM, 齐玉华 wrote: >> I try to use Valgrind to wrap some functions in target sotfwares such as >> php, libtiff. But i found that valgrind will slow down them significantly(up >> to 25 times slowwer), even if run valgrind with '--tool=none'. And as >> described in valgrind mannual, there should be 5 times slowwer than native >> running. I am confused, so anyone can help me to reduce the >> instrumentation-cost with some suggestions? I am waiting in hope for your >> advices. Thanks. > >Please tell us the version of valgrind (the output of "valgrind --version" >when fed to a shell), which hardware (x86_64, i686, PowerPC 64-bit, ARMv7, >etc.), and which operating system and release (Ubuntu Linux 12.04, Android 4.1, >MacOS 10.8 Darwin, etc.) > >How much slow-down do you observe for simple programs, such as >"valgrind --tool=none date", or 'ls', 'who', etc? > >-- >
<<attachment: good2.php>>
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