Forum: NGINX SOS! Why Nginx DID NOT flush buffer to client?

I want to the php file output 1 line per second.

see my code first:

<?php
    ob_implicit_flush(true);
    for ($i = 0; $i < 5; $i++) {
        echo "test $i";
        sleep(1);
    }
?>

OR

<?php
    ob_end_clean();
    for ($i = 0; $i < 5; $i++) {
        echo "test $i";
        flush();
        sleep(1);
    }
?>

Both not work, they output all the content after 5 seconds. NOT 1 second 
1 line.

I tried to change nginx.conf
gzip on; AND gzip off;
and it still NOT 1 second 1 line.

and I also tried to change php.ini
output_buffering = 4096
AND
output_buffering = 0
and it still NOT 1 second 1 line.

HOW CAN I FIX IT ?
SOS!!!

Posted at Nginx Forum: 
http://forum.nginx.org/read.php?2,52531,52531#msg-52531

On 02/09/2010 10:29 AM, 21andy wrote:
> ?>
> ?>
> output_buffering = 0
> nginx@nginx.org
> http://nginx.org/mailman/listinfo/nginx
>   
Hi,

Try ob_end_flush() instead of ob_end_clean().

/gh

It doesn't matter as I believe NginX buffers fastcgi responses and
then sends to the client once the request is completed.

V/r
Rob

Sent from my iPhone

On Feb 9, 2010, at 10:06 AM, Georgi Hristozov <georgi@forkbomb.nl>

21andy wrote:
> I want to the php file output 1 line per second.

I know it's not an answer to your question, but you should re-evaluate 
your application architecture. If you need progress report on lengthy 
operations you can use separate batch processes, messaging queues, 
databases, Ajax, and all sorts of tools.

The reason nginx buffers all output is because, most of the times, 
generating the response is a much faster operation than transferring it 
to the client. Therefore, by buffering it, nginx frees the backend 
worker (the php child process) sooner and the system is able to serve 
more requests per unit of time, for a given amount of ram. Which is one 
of the main aims of server optimization.

Hope this explains the logic behind it.

Tobia

Hi,

> I want to the php file output 1 line per second.

take a look at the fastcgi buffer settings:
http://wiki.nginx.org/NginxHttpFcgiModule#fastcgi_buffers


Cheers,
Daniel

You wrote:
> OR
> Both not work, they output all the content after 5 seconds. NOT 1 second 1 line.
>
> HOW CAN I FIX IT ?
> SOS!!!

--
http://daniel.hahler.de/

On Feb 15, 2010, at 4:39 AM, Daniel Hahler wrote:

> Hi,
> 
>> I want to the php file output 1 line per second.
> 
> take a look at the fastcgi buffer settings:
> http://wiki.nginx.org/NginxHttpFcgiModule#fastcgi_buffers

That won't help since if the buffer's are too small then NginX will just 
buffer it to a tmp file on the disk until the request is completed from 
the fastcgi process.

V/r,
Rob