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<?php |
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// |
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//******************************************************************************** |
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//Copyright (C) 2015 David T. Ashley |
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//******************************************************************************** |
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//This program or source file is free software; you can redistribute it and/or |
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//modify it under the terms of the GNU General Public License as published by |
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//the Free Software Foundation; either version 2 of the License, or (at your |
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//option) any later version. |
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// |
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//This program or source file is distributed in the hope that it will |
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//be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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//GNU General Public License for more details. |
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// |
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//You may have received a copy of the GNU General Public License |
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//along with this program; if not, write to the Free Software |
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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//******************************************************************************** |
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//This defines a simple PHP class to make it easier to implement a page statistic |
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//that indicates how much CPU time was used by a page or a portion of a page. |
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//The statistics are not always straightforward because each load of a page |
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//may just add more used time to the same process. Stats must be obtained |
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//by subtraction. |
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// |
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//The basic strategy is that a clock is constructed then may be alternatively |
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//started, stopped, and polled. It is necessary to stop a clock before |
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//polling it. |
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// |
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class Cpuusagestatclock |
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{ |
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//The fields below are updated each time the clock is stopped. |
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var $utime_s; |
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//The seconds portion of the amount of user time consumed. |
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var $utime_m; |
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//The microseconds portion of the amount of user time consumed. |
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var $stime_s; |
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//The seconds portion of the amount of system time consumed. |
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var $stime_m; |
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//The microseconds portion of the amount of system time consumed. |
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|
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//The following fields are analogous to the ones above, except they |
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//hold time snapshot values from when the clock was most recently |
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//started. |
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var $ss_utime_s; |
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var $ss_utime_m; |
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var $ss_stime_s; |
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var $ss_stime_m; |
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|
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//This is the constructor function. |
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function Cpuusagestatclock() |
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{ |
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//All that is required at construction is to set the cumulative |
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//values to zero. |
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$this->utime_s = 0; |
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$this->utime_m = 0; |
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$this->stime_s = 0; |
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$this->stime_m = 0; |
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} |
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|
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//This starts the clock. This just records a static time usage mark. |
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function start() |
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{ |
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//Get the snapshot from the system. |
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$snapshot = getrusage(); |
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|
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//Record the values of interest. |
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$this->ss_utime_s = $snapshot["ru_utime.tv_sec"]; |
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$this->ss_utime_m = $snapshot["ru_utime.tv_usec"]; |
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$this->ss_stime_s = $snapshot["ru_stime.tv_sec"]; |
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$this->ss_stime_m = $snapshot["ru_stime.tv_usec"]; |
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} |
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|
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|
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//This stops the clock. This calculates the used time and adds it in to |
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//the totals. |
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function stop() |
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{ |
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//Get the snapshot from the system. |
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$snapshot = getrusage(); |
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|
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//Calculate and add in the elapsed user time usage since the snapshot. |
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$this->utime_s += ($snapshot["ru_utime.tv_sec"] - $this->ss_utime_s); |
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$this->utime_m += ($snapshot["ru_utime.tv_usec"] - $this->ss_utime_m); |
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while ($this->utime_m < 0) |
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{ |
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$this->utime_m += 1000000; |
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$this->utime_s--; |
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} |
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|
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//Calculate and add in the elapsed system time usage since the snapshot. |
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$this->stime_s += ($snapshot["ru_stime.tv_sec"] - $this->ss_stime_s); |
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$this->stime_m += ($snapshot["ru_stime.tv_usec"] - $this->ss_stime_m); |
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while ($this->stime_m < 0) |
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{ |
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$this->stime_m += 1000000; |
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$this->stime_s--; |
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} |
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} |
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|
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//This returns the user time microseconds elapsed of a stopped clock, with no padding. |
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function utime_raw_us() |
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{ |
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return($this->utime_m); |
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} |
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|
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//This returns the user time microseconds elapsed of a stopped clock, padded |
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//with leading zeros to be six digits long. |
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function utime_formatted_us() |
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{ |
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$rv = $this->utime_raw_us(); |
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|
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while(strlen($rv) < 6) |
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$rv = "0" . $rv; |
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|
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return($rv); |
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} |
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|
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//This returns the system time microseconds elapsed of a stopped clock, with no padding. |
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function stime_raw_us() |
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{ |
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return($this->stime_m); |
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} |
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|
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//This returns the system time microseconds elapsed of a stopped clock, padded |
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//with leading zeros to be six digits long. |
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function stime_formatted_us() |
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{ |
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$rv = $this->stime_raw_us(); |
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|
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while(strlen($rv) < 6) |
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$rv = "0" . $rv; |
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|
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return($rv); |
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} |
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|
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//This returns the total time microseconds elapsed of a stopped clock, with no padding. |
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function ttime_raw_us() |
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{ |
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$rv = $this->stime_m + $this->utime_m; |
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|
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if ($rv >= 1000000) |
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$rv -= 1000000; |
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|
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return($rv); |
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} |
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|
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//This returns the total time microseconds elapsed of a stopped clock, padded |
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//with leading zeros to be six digits long. |
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function ttime_formatted_us() |
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{ |
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$rv = $this->ttime_raw_us(); |
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|
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while(strlen($rv) < 6) |
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$rv = "0" . $rv; |
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|
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return($rv); |
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} |
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|
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//This returns the user time seconds elapsed of a stopped clock. |
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function utime_s() |
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{ |
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return($this->utime_s); |
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} |
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|
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//This returns the system time seconds elapsed of a stopped clock. |
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function stime_s() |
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{ |
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return($this->stime_s); |
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} |
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|
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//This returns the total time seconds elapsed of a stopped clock. |
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function ttime_s() |
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{ |
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$rv = $this->stime_s + $this->utime_s; |
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|
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$us_total = $this->stime_m + $this->utime_m; |
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|
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if ($us_total >= 1000000) |
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$rv++; |
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|
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return($rv); |
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} |
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|
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//This returns the standard string for a footer of a web page. No HTML formatting tags |
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//are included. |
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function std_web_page_cpu_time_usage_footer() |
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{ |
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return |
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( |
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"This page required approximately " |
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. |
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$this->ttime_s() |
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. |
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"." |
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. |
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Substr($this->ttime_formatted_us(), 0, 2) |
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. |
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"s (" |
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. |
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$this->stime_s() |
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. |
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"." |
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. |
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Substr($this->stime_formatted_us(), 0, 2) |
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. |
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"s system, " |
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. |
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$this->utime_s() |
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. |
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"." |
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. |
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Substr($this->utime_formatted_us(), 0, 2) |
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. |
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"s user) of CPU time on the server to generate." |
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); |
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} |
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} |
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?> |
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