Hi Rasmus,
You are right. It was the problem with the browser. I used Mozilla Firefox
to try, and do not know what consideration it just serialized the identical
url http requests. I then turned to use 2 IE 6.0 windows, 2 tabs within
Maxthon browser, one IE windows and one Firefox, to test. Then I got the
conclusion as you told. Thank you very much for the help.
BTW, I could not get the flush() work, neither flush() with ob_flush(). I
tried almost all methods mentioned in the followed posts under
http://us2.php.net/flush, but none of them can really pushed the buffer out.
The site is configurated with http://liang.ns2user.info/php/info.php on Red
head, kernel 2.4.29. What can I do to get it work?
Thank you again.
Liang ZHONG wrote:
> Could you please explain it a little bit more?
> I did test this way.
>
> The code is the same for a.php and b.php
> <?php
>
> sleep(20);
> print Done. <br />";
>
> ?>
>
> I place request from 2 browser windows.
> First time, I placed with http://baseURL/a.php with both 2 browsers,
> starting times have 5 second interval. Then the first "Done" shows after
> 20 seconds and the second "Done" shows 20 seconds after the first
"Done".
>
> Then, I placed one browser with http://baseURL/a.php and the second one
> with http://baseURL/b.php, with starting time of 5 second interval. Then
> I got the first browser showing "Done" after 20 seconds and 5 seconds
> later, the second browser showed "Done", too.
>
> Thus it seems that the apache can spoon out multiple php interpreters
> responding to http requests, while php can not deal with concurrent
> process from one program.
I have no idea what you did to configure it this way. I wouldn't even
know how to do that if you asked me to. As far as PHP is concerned it
has no idea which processes are handling which script files at any one
point. So whether you request a.php and b.php at the same time or a.php
twice at the same time, it makes absolutely no difference to PHP. If
you are really seeing this, then the limitation is in your browser or
somewhere else. Try making a.php output stuff so it becomes easier to
see. As in for($i=0;$i<20;$i++) { echo $i; flush(); sleep(1); }
You should see the counter start counting as soon as you hit the page.
-Rasmus
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