ID: 40363
Updated by: [EMAIL PROTECTED]
Reported By: r dot craig at chester dot ac dot uk
-Status: Open
+Status: Feedback
Bug Type: Performance problem
Operating System: Linux 2.6.5-7.282-bigsmp
PHP Version: 5.2.0
New Comment:
I don't understand what you're talking about.
Your code works 3x faster with 5.2.0 even WITH the array stuff.
0.37447214126587 (5.2.0) vs 0.96990513801575 (5.1.6)
Try to set the timezone correctly?
Previous Comments:
------------------------------------------------------------------------
[2007-02-05 17:37:23] r dot craig at chester dot ac dot uk
If I remove the strtotime() and just have the 4000 element array, it
also works faster.
If I just remove the _assignment_ from the return_some_stuff() if also
works much faster.
But this is a sumation of a live peice of code. I want to make a 4000
array and then call strtotime 3000 times times (Is this so Odd?). This
is 10 times slower in 5.2.0 and uses 30 times as much memory.
If I take out all the code and just have "echo 'Hello World'", It's
also much faster, but that's not quite what I want to do!
------------------------------------------------------------------------
[2007-02-05 16:05:09] [EMAIL PROTECTED]
If you remove the 4000-elements array, 5.2.0 works 3x-4x times faster
than 5.1.6.
------------------------------------------------------------------------
[2007-02-05 15:35:53] r dot craig at chester dot ac dot uk
derick, but how does that compare to 5.1.6?
The memory increase during the strtotime() loop, I see is with no
php.ini (php -c /dev/null).
E_STRICT gives me warnings on both 5.2 and 5.1.6, "strtotime(): It is
not safe to rely on the system's timezone settings... " etc.
Is it perhaps something to do with logging this warning? I thought if
strict was turned off it didn't log the error at all.
------------------------------------------------------------------------
[2007-02-05 14:36:09] [EMAIL PROTECTED]
Works fine for me, do you have error_Reporting set to E_ALL | E_STRICT
?
MEM 0.07MB (0.09MB)
MEM 0.85MB (2.35MB)
Total Time: 1.058070898056 ms (4) , avergage: 0.26451772451401<br/>
MEM 0.85MB (2.35MB)
------------------------------------------------------------------------
[2007-02-05 14:29:42] r dot craig at chester dot ac dot uk
Description:
------------
Performance of the attached script is 10 times slower and uses 30 times
as much memory as it does on PHP 5.1.6.
I am not sure if it is strtotime(), this is where I first noticed the
problem. And if i take out the strtotime(), it is fine. However
strtotime() does not in itself take any longer.
Configure Command => './configure' '--with-freetype'
'--with-apxs2=/usr/sbin/apxs2' '--with-mssql' '--with-gettext'
'--with-ldap' '--with-pspell' '--enable-s
hared' '--with-jpeg-dir=/usr' '--enable-gd-native--ttf' '--with-zlib'
'--enable-magic-quotes' '--with-openssl' '--with-mysqli' '--with-mysql'
'--enable-memory
-limit' '--with-tidy=/usr/src/tidy'
'--with-config-file-path=/usr/local/Zend/etc/' '--enable-soap'
Server API => Command Line Interface
Reproduce code:
---------------
<?php
print_mem();
$t= return_some_stuff(); /** remove the assignment this is fine
performance wise, but still uses memory */
$start = microtime(true); $count =4;
print_mem();
for($i=0; $i<$count; $i++) test1();
$diff = microtime(true) - $start;
echo "Total Time: $diff ms ($count) , avergage: " .($diff/$count) .
"<br/>\n\n"; print_mem();
function test1(){
for($i=0; $i<3000; $i++){
strtotime ('2005-09-01');
/** if i take out the strtotime, or change it to microtime() or some
other NDF, performance is fine */
}
}
function return_some_stuff () {
for($i=0; $i<4000; $i++){
$x[$i]["FOOBARFOOBAR"]="FOOBAR";
}
foreach ($x as $tmp) {
$element[] = $tmp['FOOBARFOOBAR'];
}
return $element;
}
function print_mem(){
$mem = memory_get_usage();
$mem_peak = function_exists('memory_get_peak_usage')?
memory_get_peak_usage():$mem;
printf("MEM %.2fMB (%.2fMB)\n\n", $mem/1024/1024,
$mem_peak/1024/1024 ); }
?>
Expected result:
----------------
(As on PHP 5.1.6)
MEM 0.06MB (0.06MB)
MEM 0.31MB (0.31MB)
Total Time: 0.24065089225769 ms (4) , average: 0.060162723064423
MEM 0.31MB (0.31MB)
Actual result:
--------------
On php 5.2.0
MEM 0.06MB (0.06MB)
MEM 0.39MB (1.19MB)
Total Time: 2.4987750053406 ms (4) , average: 0.62469375133514<br/>
MEM 9.23MB (9.23MB)
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=40363&edit=1
