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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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//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 $ss_stime_m;
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//This is the constructor function.
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function Cpuusagestatclock()
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{
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//All that is required at construction is to set the cumulative
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//values to zero.
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$this->utime_s = 0;
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$this->utime_m = 0;
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$this->stime_s = 0;
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$this->stime_m = 0;
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}
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//This starts the clock. This just records a static time usage mark.
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function start()
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{
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//Get the snapshot from the system.
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$snapshot = getrusage();
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//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 = $snapshot["ru_stime.tv_usec"];
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}
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//This stops the clock. This calculates the used time and adds it in to
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//the totals.
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function stop()
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{
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//Get the snapshot from the system.
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$snapshot = getrusage();
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//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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//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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//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($this->utime_m);
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}
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//This returns the user time microseconds elapsed of a stopped clock, padded
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//with leading zeros to be six digits long.
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function utime_formatted_us()
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{
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$rv = $this->utime_raw_us();
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while(strlen($rv) < 6)
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$rv = "0" . $rv;
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return($rv);
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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($this->stime_m);
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}
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//This returns the system time microseconds elapsed of a stopped clock, padded
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//with leading zeros to be six digits long.
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function stime_formatted_us()
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{
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$rv = $this->stime_raw_us();
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while(strlen($rv) < 6)
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$rv = "0" . $rv;
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return($rv);
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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 + $this->utime_m;
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if ($rv >= 1000000)
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$rv -= 1000000;
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return($rv);
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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 = $this->ttime_raw_us();
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while(strlen($rv) < 6)
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$rv = "0" . $rv;
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return($rv);
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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($this->utime_s);
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}
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//This returns the system time seconds elapsed of a stopped clock.
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function stime_s()
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{
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return($this->stime_s);
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}
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//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 + $this->utime_s;
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$us_total = $this->stime_m + $this->utime_m;
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if ($us_total >= 1000000)
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$rv++;
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return($rv);
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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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