[erlang-questions] use inet_res:getbyname get timeout when a lot of processes called

[lili]

Hi friends:
   I write a little program to look up a number of host name's Address.
   I create 1W process to lookup a lot of host's address.
   case inet_res:getbyname(www.xxx.com, a) of
   it return {error, timeout}. but when i one by one call getbyname is ok.
   Who know this reason. 
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