It is likely you are hitting system limits for open file handles, check out ulimit
http://askubuntu.com/questions/162229/how-do-i-increase-the-open-files-limit-for -a-non-root-user
It is likely you are hitting system limits for open file handles, check out ulimit
http://askubuntu.com/questions/162229/how-do-i-increase-the-open-files-limit-for -a-non-root-user