Bug #14248 Updated: uniqid() is extremely slow (20ms per call)

ID: 14248 Updated by: christophe.gras@idfr.net Reported By: bartvb@iae.nl Status: Closed Bug Type: Unknown/Other Function Operating System: Linux 2.4.13-ac5 PHP Version: 4.0.5 New Comment: Here is what I noticed : A call to uniqid("") takes between 12 and 20 ms. A call to uniqid("",1) is extremely fast (below 1 ms). In the code the only difference is, with no entropy, "usleep(1)". That's not explain the difference I found. Why is it so long without entropy? Previous Comments: ------------------------------------------------------------------------ [2002-02-20 11:21:24] mikeboulet@newfangled.com This is still an issue with RH 7.1, PHP 4.0.6. Performs fine under Windows 2000. I would like to suggest that the performance issue be mentioned on uniqid() documentation. I probably spent a week looking at this issue. Our sites used the uniqid() function very heavily. This was a tough one to find! Just a thought to save someone else's sanity. Mike Boulet Newfangled Web Factory www.newfangled.com ------------------------------------------------------------------------ [2001-11-27 04:53:08] derick@php.net The implementation of uniqid is as fast as it could be, so speeding it up is not really possible (without loosing randomness) You can however try this: $uniq = md5 (time()); This will not be that unique as uniqid, but it should be good enough. Derick ------------------------------------------------------------------------ [2001-11-27 04:47:14] bartvb@iae.nl A call to uniqid() seems to take approximately 20ms. In all that time the processor seems to be doing absolutely nothing (well, it seems to be waiting for something). I wrote a convert script which uses uniqid() while testing it it took 40 seconds to convert 1600 items, without uniqid() the time went down to 3 seconds.. Quite a remarkable performance boost ;) Especially since the script was made to convert around 300.000 items. Please speed up this function.. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=14248&edit=1