Request Entity Too Large Solution

Stumbled across this issue of request entity too large when trying a script on server is trying to upload large files.  This referrers to  Apache/NGINX/IIS servers running PHP.


The solution seems to lie in the change the following variables.

memory_limit =128M
post_max_size = 96M
upload_max_filesize = 64M

Test and increase the above variables slowly by 16/32M increments to ensure your web hosting can handled

If you are on NGINX you will need to adjust client_max_body_size in the http block of the config file

The error,  '413 Request Entity Too Large'.

http {
    #...
        client_max_body_size 128m;
    #...
}


Note 'post_max_size integer' sets max size of post data allowed. This setting also affects file upload. To upload large files, this value must be larger than 'upload_max_filesize'. Generally speaking, 'memory_limit' should be larger than 'post_max_size'.

You might also want to increase the max-execution-time. Note however you server configurations, i.e. timeouts, might interrupt executions.

PHP Tuning - realpath_cache_size integer and realpath_cache_ttl integer

Two interesting directives available since PHP 5.1 are

1. real_cache_size
2. real_cahe_ttl

The given definitions are as follows.

realpath_cache_size integer - Determines the size of the realpath cache to be used by PHP. This value should be increased on systems where PHP opens many files, to reflect the quantity of the file operations performed.
The size represents the total number of bytes in the path strings stored, plus the size of the data associated with the cache entry. This means that in order to store longer paths in the cache, the cache size must be larger. This value does not directly control the number of distinct paths that can be cached.
The size required for the cache entry data is system dependent.

realpath_cache_ttl integer - Duration of time (in seconds) for which to cache realpath information for a given file or directory. For systems with rarely changing files, consider increasing the value.

One user on a Reddit Thread  seems to suggest that on enabling he got 50-70% increase in performance. That is significant. What I am not sure is how it works with APC.


References

• PHP Manual  - realpath-cache-size
• Adding this to my Drupal 7 site's php.ini dramatically improved performance
• Improve the Performance and Scalability of Your Drupal Site