When to flush a file in Go?

Question

When is it necessary to flush a file?
I never do it because I call File.Close and I think that it is flushed automatically, isn\'t it?

Answer 1

Looks the most recommendations here are to not to call fsync(), but in general it mainly depends on your application requirement. If you are working on critical file read/write, its always recommended to call fsync().

http://www.microhowto.info/howto/atomically_rewrite_the_content_of_a_file.html#idp31936

link, has more details on when file.Sync() will help.