Re: Re: Strange slowdowns in PHP

Hello, on 02/27/2006 07:22 PM William Lovaton said the following: >>> Looking at the log I get the following information: >>> - Execution time: 29.3 secs >>> - Request started at: 11:08:06 AM >>> - Request ended at: 11:08:35 AM >>> - The functions that got executed were (time, class::method, duration): >>> - 11:08:06, GraficoMaterno::alturaUterina, 0.009499 >>> - 11:08:06, GraficoAlturaUterina::session_start, 0.001259 >>> - 11:08:06, GraficoAlturaUterina::session_write_close, 0.001613 >>> - 11:08:06, GraficoAlturaUterina::sendImage, 0.029186 >>> >>> The last record in the profile (GraficoAlturaUterina::sendImage) >>> corresponds to the last couple of lines of code in the script which are: >>> imagepng($image); >>> imagedestroy($image); >> If you are generating a large image, it may take some time to flush the >> output buffer to serve to the user browser. > > The image is small. And as you can see in the profile, that operation > took 0.02 secs, so it is very fast. Unless those operations are being > executed in asynchronous mode (which I don't think they are) this might > be the responsible of the slowdown. > > I have to note that this problem is happening on random pages which also > generates regular HTML, this is not something particular to images. So > my guess would be that the problem is somewhere in the session code. What I am trying to tell you is that generating data and serving it to the user browser are to separate steps. The output that your PHP script produces goes to a buffer that needs to be flushed after the script ends. I suppose you are serving data to users with slow connections. That would explain why you have the problem some times but not always. -- Regards, Manuel Lemos Metastorage - Data object relational mapping layer generator http://www.metastorage.net/ PHP Classes - Free ready to use OOP components written in PHP http://www.phpclasses.org/