Go to System > Configuration > GoMage > Feed Pro / Server Configurations in your admin panel of Magento®.
Use this section to control the limits of PHP parameters applied to the FeedPro extension functionality of your server. You may check the current parameters allowed on your server using phpinfo() function. The following parameters are required:
memory_limit – maximum memory size allowed on your server
upload_max_filesize – maximum size allowed for uploading files on your server
post_max_size – maximum size allowed for uploading files on your server
Learn more about parameters at http://php.net/manual/en/ini.core.php
You may need to contact your host provider to learn the maximum allowed values for these parameters on your server.
Using ini_set function will allow these parameters to be used for one session only. You need to get approval from your host provider to use this function.
Screenshot: Server configurations
Memory Limit, Mb
Set the maximum size allowed by your host provider on the server. Recommended value – 512Mb.
Max Upload File Size, Mb and Max Post Size, Mb
Upload or/and Post sizes must be greater than the size of the created (generated) file. 100 MB is a sufficient size. Recommended value - 100Mb.
Execution time, seconds
This option allows you to specify how long the feed generation script is allowed to run on your server.
Learn more at http://php.net/manual/en/function.set-time-limit.php