使用Xdebug配置cachegrind时遇到问题

Question

I am trying to configure Xdebug for cachegrind but I can't manage to enable the profiler feature in order to dump executed web pages.

I'm using the official guide (and a few more with similar settings) and it doesn't seem to work.

I've tried on both of my Linux machines (Ubuntu and Fedora). Xdebug is working fine for debugging and I can start valgrind --tool=cachegrind for an application so both should be installed properly.

I was activating and deactivating profiler_enable and profiler_enable_trigger options in php.ini and restarting the server, no luck. Changed the output directory as I thought that it might be related to permissions. Using the ?XDEBUG_PROFILER=1 flag in the URL as a parameter doesn't seem to help either.

Any other clues related to the configuration of cachegrind?

Answer 1

The following basic xdebug.ini should do the trick:

; check that the path is ok for you
zend_extension=/usr/lib/php5/20090626/xdebug.so
xdebug.profiler_enable=1
xdebug.profiler_output_name = cachegring.out.%s
xdebug.profiler_output_dir = /tmp

Note that it enables the profiler for every request what is a significant performance issue. However you should test if this works first. If you see that it works, disable it per default.

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About valgrind.

Note that it is not possible what you are trying to do. The xdebug profiler isn't designed to work with / connect to valgrind. It just uses the same output format as valgrind. So, the format is the same as for example:

valgrind --tool=cachegrind --cachegrind-out-file=test.cachegrind ls -al

Usually you'll analyze the cachegrind files using a GUI program like kcachegrind on linux and wincachegrind on windows.