ID: 9260
Updated by: cynic
Reported By: [EMAIL PROTECTED]
Old-Status: Bogus
Status: Closed
Bug Type: Performance problem
Assigned To:
Comments:
ah, concurrency...
Previous Comments:
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[2001-02-14 09:18:41] [EMAIL PROTECTED]
1) microtime() isn't exactly microtime() on win32. IIRC it was improved somewhat
_after_ the release of 4.0.4 pl1, but it still goes only to miliseconds.
2) there are already bug reports concerning microtime.
bogusifying
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[2001-02-14 09:18:01] [EMAIL PROTECTED]
This is not a performance problem, but a bug in the microtime function. It was
recently fixed in CVS. Please try a snapshot from snaps.php.net. If the problem
persists, please reopen this bugreport.
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[2001-02-14 09:13:42] [EMAIL PROTECTED]
The following script only generates an array and walks through it with 2 different
loops.
There are some strange effects while watching the durations of the loops.
1. Sometimes loop 1 is faster
1. Sometimes loop 2 is faster
1. Sometimes there is a negativ duration ... ?
PHP seems to behave in real bizarre way ... looks like it has a will of it's own ;-)
<?
function test()
{
for ($i=0;$i<30000;$i++)
{
$GLOBALS['myVar'][$i]=$i;
}
$a = microtime();
for ($i=0;$i<count($GLOBALS['myVar']);$i++)
{
$GLOBALS['myVar'][$i] = $GLOBALS['myVar'][$i] *2;
}
$b = microtime();
foreach($GLOBALS['myVar'] as $i => $d)
{
$GLOBALS['myVar'][$i] = $d * 2;
}
$c = microtime();
echo('Results ... <br>');
echo("<b>$a<br>$b<br>$c</b><br>");
list($m,$s)=explode(' ',$a);$a = doubleval($s)+doubleval($m);
list($m,$s)=explode(' ',$b);$b = doubleval($s)+doubleval($m);
list($m,$s)=explode(' ',$c);$c = doubleval($s)+doubleval($m);
echo("<b>$a | $b | $c</b><br><br>");
echo("Loop 1: ".($b-$a)." seconds<br>");
echo("Loop 2: ".($c-$b)." seconds<br>");
echo("<hr>");
}
test();test();test();test();test();
?>
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