ID: 40002
User updated by: public at syranide dot com
Reported By: public at syranide dot com
Status: Open
Bug Type: Performance problem
Operating System: Windows XP 32bit
PHP Version: 5.2.0
New Comment:
Should've mentioned this in the report, but one reason behind that it
should not scale linear is because just as well as adding more clauses
you could instead just make one catch-all-clause.
This clause internally matches exceptions (using is_a etc) and if none
is matched then it is thrown again, which should have equal
functionality, but more clauses does not affect performance if no
exception is thrown.
Previous Comments:
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[2007-01-02 19:47:15] public at syranide dot com
Description:
------------
Try/Catch-statements in PHP is performing rather poorly, main problem
that seems to be that the Catch-clauses are always tried regardless of
an exception being thrown or not.
Although Try/Catch is pretty expensive (about twice of @), the worst
part is that it scales linear with each Catch.
Of course that might be very hard to not do and is not a problem, but
the problem arises from the linear scaling followed by Catch-clauses
always impacting performance, regardless of an Exception being thrown
or not.
Reproduce code:
---------------
$start = microtime(TRUE);
class PHPException extends Exception {}
for($i = 0; $i < 100000; $i++) {
try {}
catch(PHPException $e) {}
catch(PHPException $e) {}
catch(PHPException $e) {}
catch(PHPException $e) {}
catch(PHPException $e) {}
}
echo microtime(TRUE) - $start;
Expected result:
----------------
Note that the above code is rather strupid in nature, but the result is
the same regardless.
>From the above I would expect very similar performance to having only
one Catch-clause (or to be more precise, that in the event of no
exception being thrown performance is not linear to the number of
Catch-clauses).
Actual result:
--------------
(nothing useful)
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Edit this bug report at http://bugs.php.net/?id=40002&edit=1
