xhprof 安装

调试PHP时，XDebug一直是大众的不二选择，搭配上Webgrind，可以获得不错的效果。今天看某人的栖息地里的介绍，才发现了XHProf，于 是体验了一下，感觉很酷，与XDebug相比，运行更轻便，表现更易懂，下面记录一下体验过程。

安装XHProf

wget http://pecl.php.net/get/xhprof- 0.9 . 2 .tgz
tar zxf xhprof-0.9 . 2 .tgz
cd xhprof-0.9 . 2
cp -r xhprof_html xhprof_lib <directory_for_htdocs>
cd extension
phpize
./configure
make
make install

wget http://pecl.php.net/get/xhprof-0.9.2.tgz
tar zxf xhprof-0.9.2.tgz
cd xhprof-0.9.2
cp -r xhprof_html xhprof_lib <directory_for_htdocs>
cd extension
phpize
./configure
make
make install

配置php.ini

[xhprof]
extension=xhprof.so
;
; directory used by default implementation of the iXHProfRuns
; interface (namely, the XHProfRuns_Default class) for storing
; XHProf runs.
;
xhprof.output_dir=<directory_for_storing_xhprof_runs>

[xhprof]
extension=xhprof.so
;
; directory used by default implementation of the iXHProfRuns
; interface (namely, the XHProfRuns_Default class) for storing
; XHProf runs.
;
xhprof.output_dir=<directory_for_storing_xhprof_runs>

重启服务让修改生效，现在就可以使用XHProf了，不过为了显示效果更炫，最好继续安装Graphviz。

安装Graphviz

wget http://www.graphviz.org/pub/graphviz/stable/SOURCES/graphviz- 2.24 . 0 .tar.gz
tar zxf graphviz-2.24 . 0 .tar.gz
cd graphviz-2.24 . 0
./configure
make
make install

wget http://www.graphviz.org/pub/graphviz/stable/SOURCES/graphviz-2.24.0.tar.gz
tar zxf graphviz-2.24.0.tar.gz
cd graphviz-2.24.0
./configure
make
make install

安装完成后，会生成/usr/local/bin/dot文件，你应该确保路径在PATH环境变量里，以便XHProf能找到它。

使用XHProf
在你要监测的Php代码头尾部分别加入代码xhprof_enable()和xhprof_disable()

// start profiling
xhprof_enable();
// run program
....
// stop profiler
$xhprof_data  = xhprof_disable();
//
// Saving the XHProf run
// using the default implementation of iXHProfRuns.
//
include_once   $XHPROF_ROOT  .  "/xhprof_lib/utils/xhprof_lib.php" ;
include_once   $XHPROF_ROOT  .  "/xhprof_lib/utils/xhprof_runs.php" ;

$xhprof_runs  =  new  XHProfRuns_Default();

// Save the run under a namespace "xhprof_foo".
//
// **NOTE**:
// By default save_run() will automatically generate a unique
// run id for you. [You can override that behavior by passing
// a run id (optional arg) to the save_run() method instead.]
//
$run_id  =  $xhprof_runs ->save_run( $xhprof_data ,  "xhprof_foo" );

echo   "---------------/n" .
"Assuming you have set up the http based UI for /n" .
"XHProf at some address, you can view run at /n" .
"http://<xhprof-ui-address>/index.php?run=$run_id&source=xhprof_foo/n" .
"---------------/n" ;

// start profiling
xhprof_enable();
// run program
....
// stop profiler
$xhprof_data = xhprof_disable();
//
// Saving the XHProf run
// using the default implementation of iXHProfRuns.
//
include_once $XHPROF_ROOT . "/xhprof_lib/utils/xhprof_lib.php";
include_once $XHPROF_ROOT . "/xhprof_lib/utils/xhprof_runs.php";

$xhprof_runs = new XHProfRuns_Default();

// Save the run under a namespace "xhprof_foo".
//
// **NOTE**:
// By default save_run() will automatically generate a unique
// run id for you. [You can override that behavior by passing
// a run id (optional arg) to the save_run() method instead.]
//
$run_id = $xhprof_runs->save_run($xhprof_data, "xhprof_foo");

echo "---------------/n".
"Assuming you have set up the http based UI for /n".
"XHProf at some address, you can view run at /n".
"http://<xhprof-ui-address>/index.php?run=$run_id&source=xhprof_foo/n".
"---------------/n";

如此一来，会在上面设定的xhprof.output_dir目录里生成名字类似49bafaa3a3f66.xhprof_foo的数据文件， 可以很方便的通过Web方式浏览效果：

http://<xhprof-ui-address>/index.php?run=49bafaa3a3f66&source=xhprof_foo

目前显示的是表格形式的显示，点击页面上的[View Full Callgraph]，就能看到精美的图片显示了。