为了强制执行max_execution_time限制,PHP必须跟踪特定脚本所使用的CPU时间。
是否有一种方法可以在脚本中访问它?我希望在测试中包含一些关于实际PHP中消耗了多少CPU的日志记录(当脚本等待数据库时,时间不会增加)。
我用的是Linux机顶盒。
为了强制执行max_execution_time限制,PHP必须跟踪特定脚本所使用的CPU时间。
是否有一种方法可以在脚本中访问它?我希望在测试中包含一些关于实际PHP中消耗了多少CPU的日志记录(当脚本等待数据库时,时间不会增加)。
我用的是Linux机顶盒。
当前回答
我认为您应该看看xdebug。分析选项将为您了解许多与流程相关的项目提供一个良好的开端。
http://www.xdebug.org/
其他回答
developerfusion.com的Gringod给出了一个很好的答案:
<!-- put this at the top of the page -->
<?php
$mtime = microtime();
$mtime = explode(" ",$mtime);
$mtime = $mtime[1] + $mtime[0];
$starttime = $mtime;
;?>
<!-- put other code and html in here -->
<!-- put this code at the bottom of the page -->
<?php
$mtime = microtime();
$mtime = explode(" ",$mtime);
$mtime = $mtime[1] + $mtime[0];
$endtime = $mtime;
$totaltime = ($endtime - $starttime);
echo "This page was created in ".$totaltime." seconds";
;?>
从(http://www.developerfusion.com/code/2058/determine-execution-time-in-php/)
我写了一个检查剩余执行时间的函数。
警告:执行时间计数在Windows和Linux平台上是不同的。
/**
* Check if more that `$miliseconds` ms remains
* to error `PHP Fatal error: Maximum execution time exceeded`
*
* @param int $miliseconds
* @return bool
*/
function isRemainingMaxExecutionTimeBiggerThan($miliseconds = 5000) {
$max_execution_time = ini_get('max_execution_time');
if ($max_execution_time === 0) {
// No script time limitation
return true;
}
if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
// On Windows: The real time is measured.
$spendMiliseconds = (microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"]) * 1000;
} else {
// On Linux: Any time spent on activity that happens outside the execution
// of the script such as system calls using system(), stream operations
// database queries, etc. is not included.
// @see http://php.net/manual/en/function.set-time-limit.php
$resourceUsages = getrusage();
$spendMiliseconds = $resourceUsages['ru_utime.tv_sec'] * 1000 + $resourceUsages['ru_utime.tv_usec'] / 1000;
}
$remainingMiliseconds = $max_execution_time * 1000 - $spendMiliseconds;
return ($remainingMiliseconds >= $miliseconds);
}
使用:
while (true) {
// so something
if (!isRemainingMaxExecutionTimeBiggerThan(5000)) {
// Time to die.
// Safely close DB and done the iteration.
}
}
我认为您应该看看xdebug。分析选项将为您了解许多与流程相关的项目提供一个良好的开端。
http://www.xdebug.org/
这里列出了几种方法。但每个人都有自己的优点和缺点。而且(在我看来)所有较长的答案的可读性都很糟糕。
所以我决定把这些都放在一个答案中,这是容易使用和阅读的。
使用
$start = get_timers();
for( $i = 0; $i < 100000; $i++ ){
// Code to check
}
$end = get_timers();
display_timer_statistics( $start, $end );
函数定义
function display_timer_statistics( $start_timers, $end_timers ){
// Settings
$key_width = '100px';
$decimals = 4;
$decimals_wallclock = $decimals;
$decimals_request_time_float = $decimals;
// Variables
$start_resource_usage_timer = $start_timers[0];
$start_wallclock = $start_timers[1];
$end_resource_usage_timer = $end_timers[0];
$end_wallclock = $end_timers[1];
// # User time
// Add seconds and microseconds for the start/end, and subtract from another
$end_user_time_seconds = $end_resource_usage_timer["ru_utime.tv_sec"]*1000;
$end_user_time_microseconds = intval($end_resource_usage_timer["ru_utime.tv_usec"]/1000);
$start_user_time_seconds = $start_resource_usage_timer["ru_utime.tv_sec"]*1000;
$start_user_time_microseconds = intval($start_resource_usage_timer["ru_utime.tv_usec"]/1000);
$total_user_time = ($end_user_time_seconds + $end_user_time_microseconds) - ($start_user_time_seconds + $start_user_time_microseconds);
// # System time
// Add seconds and microseconds for the start/end, and subtract from another
$end_system_time_seconds = $end_resource_usage_timer["ru_stime.tv_sec"]*1000;
$end_system_time_microseconds = intval($end_resource_usage_timer["ru_stime.tv_usec"]/1000);
$start_system_time_seconds = $start_resource_usage_timer["ru_stime.tv_sec"]*1000;
$start_system_time_microseconds = intval($start_resource_usage_timer["ru_stime.tv_usec"]/1000);
$total_system_time = ($end_system_time_seconds + $end_system_time_microseconds) - ($start_system_time_seconds + $start_system_time_microseconds);
// Wallclock
$total_wallclock_time = number_format( ( $end_wallclock - $start_wallclock), $decimals_wallclock );
// Server request_time_float
$request_time_float = microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"];
$request_time_float = number_format( $request_time_float, $decimals_request_time_float );
// Print
$span_start = "<span style='width: $key_width; display: inline-block;'>";
$span_end = "</span>";
$output = "# RUNTIME AND TIMERS " . PHP_EOL ;
$output .= PHP_EOL;
$output .= $span_start . $total_user_time . $span_end . " User time (utime)" . PHP_EOL;
$output .= $span_start . $total_system_time . $span_end . " System time (stime)" . PHP_EOL;
$output .= PHP_EOL;
$output .= $span_start . $total_wallclock_time . $span_end . " Wallclock" . PHP_EOL;
$output .= PHP_EOL;
$output .= $span_start . $request_time_float . $span_end . " REQUEST_TIME_FLOAT" . PHP_EOL . PHP_EOL . PHP_EOL;
echo nl2br( $output );
}
function get_timers(){
return [ getrusage(), microtime( true ) ];
}
术语表
这些都是从PHP文档中获取的
挂钟=花了多长时间 ru =资源使用率 utime =用户使用的时间 stime =使用的系统时间 tv_sec =秒。 tv_usec =以微秒计。 电视= ??不知道
作为一种替代方法,你可以把这一行放在你的代码块中,并检查php日志,对于非常慢的函数,它非常有用:
trigger_error("Task done at ". strftime('%H:%m:%S', time()), E_USER_NOTICE);
严肃的调试使用XDebug + Cachegrind,请参见https://blog.nexcess.net/2011/01/29/diagnosing-slow-php-execution-with-xdebug-and-kcachegrind/