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<?php
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//
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//********************************************************************************
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//Copyright (C) 2006 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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//
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//Dave Ashley, 01/06
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//
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//CPU time measurement and display on a page.
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//
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//
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//Returns a string containing four integers separated by colons,
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//which are, in order, system time seconds, system time microseconds,
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//user time seconds, and user time microseconds. No left-zero padding
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//is performed.
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//
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function CPUUSE_snapshot()
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{
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$snapshot = getrusage(); //Get the resource usage in a single structure.
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//Prep and return the concatenated string.
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return(
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$snapshot["ru_stime.tv_sec"]
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.
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":"
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.
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$snapshot["ru_stime.tv_usec"]
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.
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":"
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.
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$snapshot["ru_utime.tv_sec"]
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.
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":"
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.
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$snapshot["ru_utime.tv_usec"]
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);
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}
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//
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//Returns the difference in two timestamps. Each timestamp is in the
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//format of colon-separated integers returned by CPUUSE_snapshot().
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//
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//This function won't behave properly on a negative difference (it is
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//designed for $t1 >= $t0 only.
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//
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function CPUUSE_diff($t0, $t1)
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{
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//Split the strings at the colons.
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//
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$t0_exploded = explode(":", $t0);
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$t1_exploded = explode(":", $t1);
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//
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//Calculate the differences. There is a little bit of trickiness in
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//processing the microseconds, in case the seconds has rolled over.
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//
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$rv[0] = $t1_exploded[0] - $t0_exploded[0];
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$rv[1] = $t1_exploded[1] - $t0_exploded[1];
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$rv[2] = $t1_exploded[2] - $t0_exploded[2];
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$rv[3] = $t1_exploded[3] - $t0_exploded[3];
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if ($rv[1] < 0)
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{
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$rv[1] += 1000000;
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$rv[0] -= 1;
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}
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if ($rv[3] < 0)
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{
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$rv[3] += 1000000;
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$rv[2] -= 1;
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}
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//
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//Return the result to the caller.
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return($rv[0] . ":" . $rv[1] . ":" . $rv[2] . ":" . $rv[3]);
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}
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//
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//Supplied a time difference in the format returned by CPUUSE_diff() (four colon-separated
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//integers, which are respectively system seconds, system microseconds, user seconds, and
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//user microseconds), returns two strings that can be used on a web page (seconds plus
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//two decimal points). The first string is system consumption, the second is user.
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//
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function CPUUSE_format_display_web($input_diff, &$systime, &$usertime)
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{
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//Split apart the passed integers.
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//
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$diff_exploded = explode(":", $input_diff);
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//Increase the time by 5000 microseconds to round in the second
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//decimal place.
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$diff_exploded[1] += 5000;
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if ($diff_exploded[1] > 999999)
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{
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$diff_exploded[1] -= 1000000;
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$diff_exploded[0] += 1;
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}
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$diff_exploded[3] += 5000;
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if ($diff_exploded[3] > 999999)
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{
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$diff_exploded[3] -= 1000000;
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$diff_exploded[2] += 1;
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}
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//Zero-pad system microseconds.
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while(strlen($diff_exploded[1]) < 6)
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{
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$diff_exploded[1] = "0" . $diff_exploded[1];
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}
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//Zero-pad user microseconds.
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while(strlen($diff_exploded[3]) < 6)
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{
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$diff_exploded[3] = "0" . $diff_exploded[3];
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}
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$systime = $diff_exploded[0] . "." . Substr($diff_exploded[1], 0, 2);
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$usertime = $diff_exploded[2] . "." . Substr($diff_exploded[3], 0, 2);
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}
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//
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?>
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