Performance issues with large forum migrations are usually database
i/o specific; nginx is good because it gets out of the way and sends
the php responses from fpm. Standard php configuration for nginx will
get it up and running, but you will want to tune php to suit the forum
software, and devote most of the system resources to database, which
will consume most of them. When that happens, php waits, fastcgis pile
up, and nginx will hit timeouts waiting for php, which is waiting for
mysql. Make sure mysql has good write performance and plenty of
memory. Beware of expensive forum plugins (use slow logging to spot
horrible queries that make php wait).

On Thu, Oct 4, 2012 at 12:21 AM, otherjohn <nginx-forum@nginx.us> wrote:
> Hello All,
> I am looking to optimize my nginx setup but am new to nginx and some of the
> settings. Currently the webserver is set to just default settings and on
> using an forum import script to migrate our forum from another softward I am
> getting "upstream timed out (110: Connection timed out) while reading
> response header from upstream".
> Could someone give me some suggestions?
>
> I am running an Amazon ec2 Ubuntu Precise 64 server with the folowing
> hardware setup
> 7.5 GB memory
> 4 EC2 Compute Units (2 virtual cores with 2 EC2 Compute Units each)
> 850 GB instance storage
> 64-bit platform
> I/O Performance: High
>
> I am running nginx 1.2.4 and PHP 5.3.10-1ubuntu3.4 (fpm-fcgi)
>
> The website will be running a forum with on average 2000 visitors at any
> given time, over 60k members and 4 million posts.
> I need help with the following setttings that currently only have the
> defaults set.
> php-fpm's php.ini
> php-fpm's pool configuration
> nginx.conf
> anything else you can suggest.
>
> Thanks so much!
>
> Posted at Nginx Forum: http://forum.nginx.org/read.php?2,231369,231369#msg-231369
>
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