slowfs_big_file_size
Sets the minimum file size threshold for files to be treated as 'big' in the NGINX SlowFS Cache.
Description
The slowfs_big_file_size directive in the NGINX SlowFS Cache module defines a size threshold that differentiates 'big' files from regular files. When a file exceeds this specified size, NGINX will handle it differently during the caching process. The primary purpose of this differentiation is to optimize the copying of larger files, as larger files generally consume more resources and pose a risk of service disruption if not managed correctly.
When a file is identified as a 'big' file, NGINX will fork a child process prior to copying it into the cache. This ensures that the main worker process remains responsive and can handle incoming requests without being blocked by lengthy file operations. For example, if a file's size surpasses the value set by this directive, NGINX will initiate a background process to handle the caching of the file, thereby improving performance and minimizing the impact on overall server operations.
The value for slowfs_big_file_size is specified in bytes, and it can be set in various contexts such as http, server, or location. This versatility allows administrators to tailor the size threshold to different scenarios depending on the file size distributions typical in their applications.
Config Example
server {
location /static/ {
slowfs_cache my_cache;
slowfs_temp_path /var/tmp;
slowfs_big_file_size 512k;
}
}Setting this directive too low may lead to unnecessary resource usage due to frequent forking for moderately sized files.
Values should be specified in bytes; failure to provide correct unit can lead to unexpected behavior.