How to limit the number of nodes created using the Feeds module? I want to limit the number of node created by the Feeds module, it hsould be limited to 5 each time.

I've added $conf['feeds_process_limit'] = 5; to the bottom of sites/default/settings.php

I've also changed FEEDS_PROCESS_LIMIT value in plugins/FeedsProcessor.inc to be 5

But still Feeds trying to import more than 5.

Looks like I've missed something. Anybody any hints about it?
You'll also need to clear your caches after setting $conf['feeds_process_limit'] = 50;.

Alternatively, if you are just looking for a quick limiter (during development of a custom importer, for example) this trick worked for me: 
Limit number of feed items to import ($conf['feeds_process_limit'] not working) (an active issue in the Feeds issue queue).