Your NFS doesn't have file locking support.
The template_cache.php you're running now is lacking file locking so you might run into empty files again when there's a lot of requests on the server.
To make this 100% sure I'd advise you to try to compile your NFS with file locking support. (Or add some sort of protection with a if (rand()<0.2) before writing the file. Just give it a try..).
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