[erlang-questions] About error enfile?

[yaohui]

I do a test C1000k, when connections reach to 540k, I got a error {badmatch,{error,enfile}}. 
 {error,enfile} this error represents the files tables is full (for the entire OS)
 but my kernel 
 ulimit -n 
 800000
 cat /proc/sys/fs/file-max 
 2215800 
  
 {error,enfile} is this error means other problem?
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